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Hydrological impacts on denitrification and nirS-and nirK-microbial community shifts in floodplains:Insights from water recession and flooding periods 认领 引用
1
作者 Zheng Hao Qianhong Wang +2 位作者 Zaisheng Yan Shangwei He Helong Jiang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第7期308-316,共9页
Floodplains play a critical role in mitigating nitrogen loads and nutrient pollution in aquatic ecosystems through denitrification.However,the effects of the impacts of dramatic water-level fluctuations on nitrogen dy... Floodplains play a critical role in mitigating nitrogen loads and nutrient pollution in aquatic ecosystems through denitrification.However,the effects of the impacts of dramatic water-level fluctuations on nitrogen dynamics and the associated microbial communities remains poorly understood.This study explored denitrification processes and alterations in functional microbial communities in the Poyang Lake wetlands,with particular focus on microbial responses to hydrological recession and flooding.Denitrification activity was negligible in soils dominated by Carex cinerascens and Cynodon dactylon during water recession,but potential denitrification rates increased significantly during flooding.Ordination regression analysis and Mantel tests showed that these denitrification changes correlated strongly with shifts in functional microbial communities.In particular,studies have shown that the α-diversity of the soil nirS bacterial community was significantly lower after the recession than during flooding,indicating inhibition of denitrifying communities under drought.During flooding,key species such as nirS-type Rhodocyclales,nirK-type Bradyrhizobium,and Nitrosospira became abundant.These denitrifiers and environmental factors(moisture,temperature,and substrate availability)played crucial roles in denitrification during the hydrological changes in floodplains. 展开更多
关键词 Floodplains Hydrological changes Nitrogen dynamics Denitrification Microbial communities NirSirK genes
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Full-scale Applications of a Sulfur-Based Autotrophic Denitrification Biofilter for Polishing Secondary Effluent:Annual Performance,Improved Winter Performance,and Microbial Community Succession 认领 引用
2
作者 Jia-Min Xu Hao-Ran Xu +9 位作者 Chong-Gang Liang Ze-Run Cheng Xu-Chen Ba Gui-Jiao Zhang Da-Heng Ren Na Zhang Jia-Qiang Lv Yi-Lu Sun Aijie Wang Hao-Yi Cheng 《Engineering》 SCIE EI CSCD 2026年第7期303-315,共13页
Sulfur-based denitrification (SADeN) technology is a cost-saving and low-carbon alternative for treating organic-deficient wastewater. However, the use of this technology in full-scale applications is still limited. C... Sulfur-based denitrification (SADeN) technology is a cost-saving and low-carbon alternative for treating organic-deficient wastewater. However, the use of this technology in full-scale applications is still limited. Crucial concerns for biological processes, such as changes in seasonal performance and the ways in which it responds to low temperatures, have yet to be studied in real SADeN processes. Herein, two SADeN biofilters in parallel (downflow, with a design water treatment capacity of 8000 m3·d−1 for each) were systematically investigated over a period of more than 400 days. Seasonal variations in denitrification rates were observed, with an average difference of up to 2 times between summer and winter. The use of thiosulfate was verified as an efficient strategy to improve the performance of SADeN biofilters in winter, which was found to have an overstoichiometric enhancement effect (OSEE), with 24.79%-331.50% more nitrate removal than that calculated according to thiosulfate dosages. Analyzing the biofilter vertically revealed that the OSEE occurred because thiosulfate rapidly consumed dissolved oxygen in the upper zone of the bed and activated the electron flux of the sulfur-based reactive filler (SReF) in the lower zone. Microbial community analysis further suggested that this increase in electron flux may be associated with the abundance recovery of sulfur autotrophic denitrifiers and the stability recovery of the microbial eco-networks. This study offers a paradigm for the full-scale application of SADeN technology in real wastewater treatment plants, providing an in-depth understanding of the role of dosing thiosulfate in tackling low-temperature challenges. 展开更多
关键词 Sulfur autotrophic denitrification Full-scale application Thiosulfate Overstoichiometric enhancement effect Microbial community seasonal succession
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Nitrogen removal dynamics in a eutrophic-tributary of China's Three Gorges Reservoir during water impoundment period:Insights from denitrification rates and dissolved N2measurements 认领 引用
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作者 Yanan Huang Yanxing Han +4 位作者 Xiaojuan Guo Zhengjian Yang Daobin Ji Shangbin Xiao Defu Liu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第5期242-251,共10页
Reservoirs function as critical nitrogen sinks within watersheds,yet their removal efficiencies remain poorly characterized.In this study,we quantified denitrification rates and excess dissolved nitrogen gas(N2)in ... Reservoirs function as critical nitrogen sinks within watersheds,yet their removal efficiencies remain poorly characterized.In this study,we quantified denitrification rates and excess dissolved nitrogen gas(N2)in Xiangxi Bay,a eutrophic tributary of the Three Gorges Reservoir(TGR)to evaluate its capacity for nitrogen removal.The results indicated that water denitrification rates ranged from 5.16 to 65.31 nmol/(L·h),whereas those in sediments ranged from 2.56 to 7.75 nmol/(g·h).Both exhibited an increasing trend from downstream to upstream during the water impoundment period of the TGR.The in-situ variation of excess dissolved N2(ΔN2)concentration(1.05-98.97µmol/L)reflected the spatiotemporal distribution characteristics of denitrification rates and nitrogen removal capacity,indicating substantial nitrogen removal in Xiangxi Bay.Additionally,key factors affecting denitrification in water included dissolved organic carbon(DOC),chlorophyll a,and turbidity,whereas key factors in sediments were total organic carbon,total nitrogen,and DOC in pore water.Overall,the increase in organic matter in water and sediments triggered by algal growth/death and settling promoted denitrification,but excessive algal proliferation could lead to nitrogen limitation,thereby inhibiting denitrification.Therefore,preventing and managing algal blooms in tributaries could provide new insights for removing nitrogen in watersheds and safeguarding the health of aquatic ecosystems. 展开更多
关键词 Denitrification rate Nitrogen removal Excess dissolved N2 Three Gorges Reservoir Xiangxi Bay
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Unraveling mechanisms of mechanical shear stress-regulated high nitrite production in denitrification:granular structure and metagenomic evidence 认领 引用
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作者 Jiarui Fan Shenbin Cao +2 位作者 Xiangchen Li Yongzhen Peng Rui Du 《ENGINEERING Environment》 SCIE EI CAS CSCD 2026年第4期63-79,共17页
Partial denitrification granules(PDG)offer a novel approach to supplying nitrite(NO2−)for anammox.Shear stress(τ)induced by mechanical stirring has been recognized as an effective operational strategy for enhancin... Partial denitrification granules(PDG)offer a novel approach to supplying nitrite(NO2−)for anammox.Shear stress(τ)induced by mechanical stirring has been recognized as an effective operational strategy for enhancing mass transfer in continuous-flow PDG systems with minimal gas production.However,the effects of shear stress intensity on nitrite(NO2−)accumulation,granular structure,and microbial succession remains unclear.This study established two continuously up-flow PDG systems to assess the influence of low-strengthτ(0.2-0.5 Pa)and high-strengthτ(1.2-1.4 Pa)on PDG performance under dynamic nitrate(NO3−)loading rates(NLR).Results indicated that lowstrengthτpromoted the formation of 1-2 mm granules,mitigating the washout of flocs and smaller granules,and sustaining a stable nitrite production rate(NPR)of 7.7 kg N/(m3·d)at an NLR as high as 11.7 kg N/(m3·d).In contrast,high-strengthτcaused particle fragmentation and reaggregation,accompanied by the washout of sludge containing PD bacteria,leading to a lower NPR of 0.2 kg N/(m3·d).Metagenomic analysis revealed that low-strengthτenhanced nitrogen-carbon metabolism,with Thauera.sp.and Thauera_phenylacetica synergistically driving NO2−accumulation.Although highstrengthτpromoted the enrichment of Thauera(~70%),Thauera.sp.decreased its contribution to napA and improved to nirK,whereas Thauera_phenylacetica reduced its contribution to napA,thereby constraining NO2−accumulation.These findings provide critical insights into optimizing shear conditions for PDG and enhance the understanding of the metagenomic mechanisms of PD. 展开更多
关键词 Shear stress(τ) Partial denitrification Nitrite production rate Granular structure Metabolic mechanism
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Single and combined impacts of antibiotics on aerobic denitrification:Cell growth characteristics and functional genes expressions 认领 引用
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作者 Rong-Rong Chang Chang-Ze Shi +4 位作者 Yun-Jie Ruan Bao-Cheng Huang Ren-Cun Jin Ming Dong Wen-Bing Li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第2期461-467,共7页
Antibiotic contamination has garnered significant attention,particularly given the growing pressures from aquaculture,a key contributor to environmental antibiotic loads.Addressing both antibiotic and nitrogen polluti... Antibiotic contamination has garnered significant attention,particularly given the growing pressures from aquaculture,a key contributor to environmental antibiotic loads.Addressing both antibiotic and nitrogen pollution in such ecosystems is critical.In this study,the aerobic denitrifying bacterium Marinobacter hydrocarbonoclasticus RAD-2,previously isolated in our laboratory,was subjected to a series of concentration gradients(0,20,40,60,80,100 mg/L)to evaluate the single and combined effects of tetracycline(TET)and chlortetracycline(CTC)on the aerobic denitrification process.Among them,the combined effects of antibiotics were set up in a full-factor experimental design(a total of 30 treatment combinations)on the basis of the single-factor experiments of TET and CTC.Results demonstrated that the inhibitory impact of both antibiotics intensified with increasing concentration,with CTC exerting a more pronounced inhibitory effect.Notably,RAD-2 was unable to proliferate at 100 mg/L of TET or 80 mg/L of CTC.High concentrations of either antibiotic significantly suppressed the expression of key denitrification functional genes,including nirX,napA,norB,and nosZ.Furthermore,simultaneous exposure to both antibiotics led to a rapid decline in nitrogen removal efficiency(TET or CTC>60 mg/L),alongside substantial inhibition of bacterial growth and functional gene expression,except for napA.Under specific concentration ranges,the combination of TET and CTC exhibits a certain degree of antagonistic effect.These findings provide critical insights into the restoration of wetland ecosystem health and inform strategies to mitigate the dual challenges of antibiotic and nitrogen pollution in aquaculture effluents. 展开更多
关键词 Antibiotics Aerobic denitrification Synergistic effects Functional genes inhibition
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Novel dual-particle sulfur-driven partial denitrification coupled with anammox for robust nitrogen removal at ambient temperature 认领 引用
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作者 Ruoxi Chen Qi Zhao +3 位作者 Luyao Wang Qiong Zhang Xiyao Li Yongzhen Peng 《ENGINEERING Environment》 SCIE EI CAS CSCD 2026年第1期205-217,共13页
To address the current shortage of organic matter and enable the effective utilization of inorganic carbon resources in wastewater,a dual-particle carrier system was developed by integrating elemental sulfur(S0)partic... To address the current shortage of organic matter and enable the effective utilization of inorganic carbon resources in wastewater,a dual-particle carrier system was developed by integrating elemental sulfur(S0)particles with anammox granular sludge,aiming to establish a S0-driven partial denitrification coupled with anammox(S0PDA)process for the simultaneous removal of NH4+and NO3–.Under seasonal temperature fluctuations(11.9–26.6°C,average 17.5°C),the system achieved a total inorganic nitrogen removal efficiency(TINRE)of 95.7%±4.6%.Kinetic and mechanistic analyses revealed that NO3–was preferentially reduced over NO2–by sulfur-oxidizing bacteria(SOB),while anammox bacteria(AnAOB)competitively utilized NO2–,thereby enhancing NH4+reduction.Thiobacillus and Candidatus Brocadia were identified as the dominant bacterial genera,with both genera exhibiting niche differentiation under ambient temperature:Thiobacillus predominantly colonized S0 particle surfaces,whereas Candidatus Brocadia was preferentially enriched in granular sludge,thereby minimizing substrate competition.Overall,the dual-particle S0PDA system demonstrated robust performance under ambient conditions,providing a sustainable solution for low C/N wastewater treatment. 展开更多
关键词 Wastewater treatment Sulfur-driven autotrophic denitrification Anammox-mediated nitrogen removal Temperature-tolerant resilience Microbial niche differentiation
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Linking nitrite accumulation to shift in carbon utilization of denitrification:from single to composite electron donor 认领 引用
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作者 Qingtao Liu Rui Du +1 位作者 Jiarui Fan Yongzhen Peng 《ENGINEERING Environment》 SCIE EI CAS CSCD 2026年第2期13-28,共16页
The role of organic carbon source as electron donor in incomplete denitrification,particularly in nitrite(NO2−)accumulation,remains crucial yet poorly understood.A detailed understanding of carbon and nitrogen m... The role of organic carbon source as electron donor in incomplete denitrification,particularly in nitrite(NO2−)accumulation,remains crucial yet poorly understood.A detailed understanding of carbon and nitrogen metabolic interactions is essential for advancing technologies that integrate partial denitrification(PD)with anammox.In this study,the carbon transformation and gradient utilization of various volatile fatty acids(VFAs)were explored to elucidate their impacts on nitrate(NO3−)and NO2−reduction during PD.Long-term experiments revealed that composite VFAs(a mixture of acetate,propionate and butyrate)achieved the highest nitrate-to-nitrite transformation ratio(NTR)of 79.1%,outperforming single VFA(69.5%with acetate and 69.4%with propionate).The NO2−accumulation during PD was strongly influenced by the utilization of exogenous,endogenous and extracellular carbon,which varied significantly with VFAs type and dosage.Polyhydroxybutyrate(PHB)served as the primary endogenous electron donor in acetate-driven PD,promoting modest NO2−accumulation,while polyhydroxyvalerate(PHV)along with glycogen(Gly)was the key contributor in propionate-driven PD,supporting complete NO3−reduction.In contrast to single VFA-driven PD,the lower levels and delayed utilization of PHB and PHV in composite VFAs-driven PD enabled more stable and efficient NO2−accumulation.Furthermore,metagenomic analysis illuminated that the transition from single VFA to composite VFAs strengthened the potential for both electron production and their transport to NO3−reductase.Thauera was always the core denitrifier demonstrating strong adaptability to various VFAs.This study provides mechanistic insights into organic carbon-regulated NO2−accumulation,filling the gap regarding dynamic changes in carbon utilization during PD. 展开更多
关键词 Partial denitrification Single VFA Composite VFAs Gradient carbon utilization Nitrite accumulation and reduction
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Parallel denitrification and nitrite oxidation in the unsaturated zone: Isotopic constraints from nitrate δ15N and δ18O in Tianjin, China 认领 引用
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作者 Dongmei Xue Jinglei Wang +6 位作者 Lanxin Xiang Xiaoxian Peng Ke Jin Yunting Fang Xiangzhen Li Yidong Wang Zhongliang Wang 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2026年第6期2580-2594,共15页
Denitrification plays a critical role in mitigating anthropogenic nitrate(NO3-) accumulation in ecosystems.The isotopic composition of NO3-(δ15N and δ18O) serves as a powerful tracer for identifyin... Denitrification plays a critical role in mitigating anthropogenic nitrate(NO3-) accumulation in ecosystems.The isotopic composition of NO3-(δ15N and δ18O) serves as a powerful tracer for identifying N sources and transformation processes.Denitrification often superimposed on the isotope effects of NO2- oxidation, resulting in parallel enrichment of δ15N-and δ18O-NO3-(Δδ18O:Δδ15N trajectory) that causes them to be either below or above 1.This study compared the Δδ18O:Δδ15N trajectory during denitrification, functional genes(nar G, nap A, and nxr A), and carbon sources from metabolites in the Δδ18O:Δδ15N trajectories below or above 1 in unsaturated zones.The results revealed that NO3- reduction was more important for variation in the Δδ18O:Δδ15N trajectory because the difference in isotope effects(15ε_(NO_(3 reduction)) and 18ε_(NO_(3 reduction))) between the two Δδ18O:Δδ15N trajectory groups was significant, whereas the difference in isotope effects(15εnxr and 18εnxr) upon NO2- oxidation was not.Carbon sources in the group with Δδ18O:Δδ15N trajectories below 1 facilitated more efficient electron production to promote NO3- reduction because of their low molecular weight and simple structure.Conversely, the lower electron production efficiency due to the high molecular weight and complex structures of carbon sources in the group with Δδ18O:Δδ15N trajectories above 1 downregulated the expression of the three functional genes(nar G, nap A, and nxr A).The group with Δδ18O:Δδ15N trajectories below 1 showed significantly higher levels of 15ε_(NO_(3 reduction)), 18ε_(NO_(3 reduction)), NO2- oxidation ratio, and copy numbers of nar G, nap A, and nxr A genes compared to the other group, revealing that NO3- reduction at the cellular level was more active in the former group.This study elucidated the integrated infiuence of isotope effects, NO3- reductase and NO2- oxidoreductase activities, and carbon sources from metabolites.These findings are significant for understanding the Δδ18O:Δδ15N trajectories of N cycling in terrestrial ecosystems and support groundwater conservation by improving carbon supplementation approaches that stimulate denitrification, with Δδ18O:Δδ15N trajectories serving as effective tracers for assessing denitrification performance in terrestrial environments. 展开更多
关键词 denitrification NO2-oxidation Δδ18O:Δδ15N trajectory NO3-reductase NO2-oxidoreductase carbon sources
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Impacts of trace ofloxacin on autotrophic denitrification process driven by pyrite/sulfur:Performance,microbial community evolution and metagenomic analysis 认领 引用
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作者 Wenyu Yang Xin Xin Xishuang Cao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第1期775-784,共10页
In this work,ofloxacin(OFL),a kind of frequently detected antibiotic in groundwater,was selected to explore its impact(at ng/L-μg/L-level)on denitrification performance in an autotrophic denitrification system driven... In this work,ofloxacin(OFL),a kind of frequently detected antibiotic in groundwater,was selected to explore its impact(at ng/L-μg/L-level)on denitrification performance in an autotrophic denitrification system driven by pyrite/sulfur(FeS2/S0).Results showed that OFL restrained nitrate removal efficiency,and the inhibition degree was positively related to the concentration of OFL.After being exposed to increased OFL(200 ng/L-100μg/L)for 69 days,higher inhibition of electron transport activity(ETSA),enzyme activities of nitrate reductase(NAR),and nitrite reductase(NIR)were acquired.Meanwhile,the extracellular protein(PN)content of sludge samples was remarkably stimulated by OFL to resist the augmented toxicity.OFL contributed to increased microbial diversity and sulfur/sulfide oxidation functional genes in ng/L-level bioreactors,whereas led to a decline inμg/L level experiments.With OFL at concentrations of 200 ng/L and 100μg/L,the whole expression of 10 key denitrification functional genes was depressed,and the higher the OFL concentration,the lower the expression level.However,no significant proliferation of antibiotic resistance genes(ARGs)either in 200 ng/L-OFL or 100μg/L-OFL groups was observed.Two-factor correlation analysis results indicated that Thiobacillus,Anaerolineae,Anaerolineales,and Nitrospirae might be the main hosts of existing ARGs in this system. 展开更多
关键词 Autotrophic denitrification Ofloxacin antibiotics Microbial community Metabolism of nitrogen/sulfur Antibiotic resistance genes
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Study on the adsorptive denitrification performance of MIL-101(Cr) and its theoretical calculation 认领 引用
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作者 QIN Yue TANG Ke +3 位作者 HONG Xin WANG Han SHEN Shuo CHEN Jinghui 《燃料化学学报（中英文）》 EI CAS CSCD 北大核心 2026年第2期180-192,共13页
The adsorptive denitrification performance of MIL-101(Cr)-0.5 toward pyridine,aniline or quinoline in simulated fuels with basic nitrogen content of 1732μg/g was evaluated separately.Furthermore,the effects of adsorp... The adsorptive denitrification performance of MIL-101(Cr)-0.5 toward pyridine,aniline or quinoline in simulated fuels with basic nitrogen content of 1732μg/g was evaluated separately.Furthermore,the effects of adsorption temperature,adsorption time and adsorbent dosage on their adsorptive denitrification performance were systematically investigated.The experimental results demonstrated that under a fixed adsorbent dosage of 0.05 g and a simulated fuel volume of 10 mL,the optimal removal efficiency for aniline was achieved at 30℃ within 30 min,whereas higher temperatures and longer times(40℃and 40 min)were required for effective removal of pyridine and quinoline.Density Functional Theory(DFT)calculations were conducted via Materials Studio(MS)software to study the adsorptive denitrification mechanism of MIL-101(Cr)toward these three basic nitrogen-containing compounds.The simulation calculation results revealed that the interaction between pyridine and MIL-101(Cr)primarily involved coordination adsorption.In contrast,the interaction between aniline or quinoline and MIL-101(Cr)proceeded mainly through coordination,with additional contributions fromπ-complexation and hydrogen bonding.The overall adsorption strength order is pyridine>aniline>quinoline.During the adsorption process,pyridine and quinoline transfer electrons to the MIL-101(Cr)surface through the H→C→N→Cr3+pathway,while aniline transfers electrons to the MIL-101(Cr)surface through various pathways,including N→Cr3+,N→C→Cr3+and N→H→O.Furthermore,adsorption kinetics studies indicated that the adsorption processes for all three basic nitrogen-containing compounds followed the quasi second order kinetic models.The experimental results on the effect of benzene on the adsorptive denitrification performance of MIL-101(Cr)-0.5 demonstrated that benzene exerted a more significant impact on the adsorption of aniline and quinoline.Finally,the adsorbent was regenerated using ethanol washing.It was found that MIL-101(Cr)-0.5 retained stable denitrification performance after two regeneration cycles. 展开更多
关键词 MIL-101(Cr) adsorptive denitrification competitive adsorption regeneration performance simulation calculation
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Denitrification processes,inhibitors,and their implications in ground improvement 认领 引用
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作者 Yasaman Abdolvand Mohammadhossein Sadeghiamirshahidi Ishi Keenum 《Biogeotechnics》 2026年第2期52-74,共23页
Ureolysis and denitrification are the two major microbial metabolic pathways commonly used in Microbially induced calcite precipitation(MICP)for geoengineering applications.Although ureolysis is generally the more eff... Ureolysis and denitrification are the two major microbial metabolic pathways commonly used in Microbially induced calcite precipitation(MICP)for geoengineering applications.Although ureolysis is generally the more efficient pathway,the denitrification pathway has gained more attention recently because a diverse group of bacteria can precipitate calcite via denitrification,and no harmful byproduct is generated provided that the reduction of nitrate to nitrogen gas is complete.There are,however,many environmental factors that could inhibit or reduce the efficiency of the denitrification process in soil.Some examples of these factors include salinity,pH,temperature,biodiversity(abundance and species of denitrifiers and competitors),water stress(extreme wet-dry conditions),degree of saturation(anaerobic vs.aerobic conditions),high heavy metal content(e.g.,mine tailings),and shortage of dissolved carbon sources.In this paper,the denitrification process,the denitrification inhibitors,and the mechanisms involved in their inhibition of the denitrification process are discussed in detail.This investigation indicates that although general optimum conditions can be formulated for MICP through denitrification,significant adjustments may be necessary if inhibitory conditions are anticipated.It was also shown that when inhibitors are expected,it is crucial to investigate not only the amount of precipitated calcium carbonate but also the N2O/N2 gase ratio to ensure the complete reduction of nitrate to nitrogen gas and prevent the release of byproducts(especially N2O)into the environment.Finally,the implications of the inhibitory factors on the field application of denitrification MICP treatment for different geotechnical projects are discussed. 展开更多
关键词 Microbially induced calcite precipitation (MICP) Biocementation Denitrification Environmental conditions Inhibitors
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Effects of Zn(Ⅱ)on the simultaneous nitrification and denitrification(SND)process:Performance and microbial community 认领 引用 被引量：1
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作者 Hu Chen Ying Wang +1 位作者 Yulan Zou Yongkang Lv 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第1期301-309,共9页
Simultaneous nitrification and denitrification(SND)is considered an attractive alternative to traditionally biological nitrogen removal technology.Knowing the effects of heavy metals on the SND process is essential fo... Simultaneous nitrification and denitrification(SND)is considered an attractive alternative to traditionally biological nitrogen removal technology.Knowing the effects of heavy metals on the SND process is essential for engineering.In this study,the responses of SND performance to Zn(Ⅱ)exposure were investigated in a biofilm reactor.The results indicated that Zn(Ⅱ)at low concentration(≤2 mg·L-1)had negligible effects on the removal of nitrogen and COD in the SND process compared to that without Zn(Ⅱ),while the removal of ammonium and COD was strongly inhibited with an increasing in the concentration of Zn(Ⅱ)at 5 or 10 mg·L-1.Large amounts of extracellular polymeric substance(EPS),especially protein(PN),were secreted to protect microorganisms from the increasing Zn(Ⅱ)damage.High-throughput sequencing analysis indicated that Zn(Ⅱ)exposure could significantly reduce the microbial diversity and change the structure of microbial community.The RDA analysis further confirmed that Azoarcus-Thauera-cluster was the dominant genus in response to low exposure of Zn(Ⅱ)from 1 to 2 mg·L-1,while the genus Klebsiella and Enterobacter indicated their adaptability to the presence of elevated Zn(Ⅱ).According to PICRUSt,the abundance of key genes encoding ammonia monooxygenase(EC:1.14.99.39)was obviously reduced after exposure to Zn(Ⅱ),suggesting that the influence of Zn(Ⅱ)on nitrification was greater than that of denitrification,leading to a decrease in ammonium removal of SND system.This study provides a theoretical foundation for understanding the influence of Zn(Ⅱ)on the SND process in a biofilm system,which should be a source of great concern. 展开更多
关键词 Simultaneous nitrification and denitrification Zn(Ⅱ) Nitrogen removal Microbial community Sequencing batch biofilm reactor(SBBR)
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Numerical Study on the Influence of Rectifier Grid on the Performances of a Cement Kiln’s SCR(Selective Catalytic Reduction)Denitrification Reactor 认领 引用
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作者 Liang Ai Mingyue Li +6 位作者 Lumin Chen Yihua Gao Yi Sun Yue Wu Fuping Qian Jinli Lu Naijin Huang 《Fluid Dynamics & Materials Processing》 EI 2025年第5期1171-1190,共20页
In this study,Computational Fluid Dynamics(CFD)together with a component transport model are exploited to investigate the influence of dimensionless parameters,involving the height of the rectifier grid and the instal... In this study,Computational Fluid Dynamics(CFD)together with a component transport model are exploited to investigate the influence of dimensionless parameters,involving the height of the rectifier grid and the installation height of the first catalyst layer,on the flow field and the overall denitration efficiency of a cement kiln’s SCR(Selective catalytic reduction)denitrification reactor.It is shown that accurate numerical results can be obtained by fitting the particle size distribution function to the actual cement kiln fly ash and implementing a non-uniform particle inlet boundary condition.The relative error between denitration efficiency derived from experimental data,numerical simulation,and real-time system pressure drop ranges from 4%to 9%.Optimization of the SCR reactor is achieved when the rectifier grid thickness ratio k/H≥0.030,the rectifier grid height ratio h/H=0.04,and the spacing between the rectifier grid and the first catalyst layer l/H=0.10.Under these conditions,airflow distribution and particle dispersion upstream of the catalyst result in increased denitration efficiencies of 3.21%,3.43%,and 3.27%,respectively,compared to the least favorable operating conditions. 展开更多
关键词 Cement kiln flue gas SCR denitrification reactor rectifier grid denitrification efficiency structure optimization
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Economic and carbon emission analysis of two typical denitrification systems for sintering process in the iron and steel industry 认领 引用
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作者 Jianguo Yang Mengdan Wu +6 位作者 Jian Gao Hanxiao Liu Miaomiao Cheng Xuecheng Wu Xiang Gao Kunzan Qiu Yang Yang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第10期79-90,共12页
The transition of the Chinese iron and steel industry to ultralow emissions has accelerated the development of denitrification technologies.Considering the existing dual carbon targets,carbon emissions must be conside... The transition of the Chinese iron and steel industry to ultralow emissions has accelerated the development of denitrification technologies.Considering the existing dual carbon targets,carbon emissions must be considered as a critical indicator when comparing denitrification systems.Consequently,this study provided a comprehensive cost-benefit model for denitrification in the steel industry,encompassing additional carbon emissions resulting from the implementation of denitrification systems.Activated-carbon adsorption and selective catalytic reduction(SCR)systems are two efficient techniques for controlling NOx emissions during sintering.Based on thismodel,a cost-benefit analysis of these two typical systems was conducted,and the results indicated that the unit flue-gas abatement costs of SCR and activated-carbon adsorption systems were 0.00275 and 0.0126 CNY/m3,and the unit flue-gas abatement benefits were 0.0072 and 0.0179 CNY/m3,respectively.Additionally,the effect of operational characteristics on operating costs,including duration and material prices,was analyzed.When treating the flue gas,the two systems released 0.0020 and 0.0060 kg/m3 of carbon dioxide,respectively.The primary sources of carbon emissions from the SCR and activated-carbon adsorption systems are the production of reducing agents and system operations,respectively.Furthermore,considering the features of the activated carbon adsorption system for simultaneous desulfurization,a SCR-wet flue gas desulfurization(WFGD)technology route was developed for comparison with the activated carbon adsorption system. 展开更多
关键词 Iron and steel industry Denitrification technology Carbon emission Cost-benefit model Economic analysis
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Simultaneous Denitrification and Decarbonization of Wastewater over In Situ Generation of·ClO Radicals Through a Fast,High-Performance Electro-Filtration Process 认领 引用
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作者 Bin Zhao Jialin Yang +2 位作者 Ruiping Liu Jiuhui Qu Meng Sun 《Engineering》 SCIE EI CSCD 2025年第12期217-228,共12页
The contamination of wastewater with organic pollutants and nitrogen compounds poses significant environmental challenges.The primary objective of wastewater treatment is the simultaneous denitrification and decarboni... The contamination of wastewater with organic pollutants and nitrogen compounds poses significant environmental challenges.The primary objective of wastewater treatment is the simultaneous denitrification and decarbonization of ammonia nitrogen and organics into harmless by-products.This study presents a novel method for the directional generation of chlorine radical species like·ClO and·Cl using electro-reactive membranes(EMs)known as RuO2@PbO2-M,which were fabricated using an electro-deposition coupled template approach.This method facilitates the rapid and efficient conversion of ammonia to nitrogen and concurrently reduces the chemical oxygen demand in the effluent.Our system achieved ultra-efficient simultaneous denitrification and decarbonization with minimal energy consumption in single-filtration mode,thereby eliminating the need for chemical precursors.We elucidate the formation pathway of·ClO and·Cl during the electrochemical oxidation process involving RuO2@PbO2-M,where·Cl generated from RuO2reacts with·OH from PbO2under hypochlorous acid conditions,thereby enhancing nitrogen and carbon removal.These findings highlight a novel electro-filtration and an innovative reactive membrane design for·ClO synthesis,which provides a new research framework for the concurrent removal of nitrogen and carbon,and offers a promising solution to enhance wastewater treatment efficiency. 展开更多
关键词 Wastewater treatment Denitrification Decarbonization Chlorine oxide radical Electro-reactive membranes
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Millimeter-scale interactions of nitrogen and potassium on denitrification,anammox,and Feammox in soil fertilization zones 认领 引用
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作者 Jingjing Lyu Rui Tian +7 位作者 Runhua Zhang Peng Chen Xinxin Jing Runqin Zhang Kang Zhao Yi Liu Chenhao Lyu Zhiguo Li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第11期158-169,共12页
Soil denitrification,anammox,and Feammox are key for nitrogen(N)removal in agriculture.Despite potassium(K)fertilizer enhancing N efficiency,their role in regulation of these processes is unclear.A soil column incubat... Soil denitrification,anammox,and Feammox are key for nitrogen(N)removal in agriculture.Despite potassium(K)fertilizer enhancing N efficiency,their role in regulation of these processes is unclear.A soil column incubation with 15N isotope tracingwas conducted to explore millimeter-scale interactions of N and K on these pathways in soil fertilization zones.After 28 days,individual applications of N and K reduced denitrification-nitrogen removal rate(DNRR),anammox-nitrogen removal rate(ANRR),and feammox-nitrogen removal rate(FNRR)compared to a non-fertilizer control.N fertilizer had a greater effect than K,likely due to the high consumption of dissolved organic carbon by N fertilizer or the increased soil organic matter decomposition by K fertilizer.Combing of N and K increased DNRR,ANRR and FNRR rates by 31%,3090%and 244%compared to single N,and by-53.7%,885%and 222%compared to single K.These effects diminished with depth and distance from fertilizer sites.The effects of N fertilizer on these N removal processes might be regulate abundance of key microbes(e.g.,Limnobacter and Clostridium)and key gene(nirK,hzsB,ACM and Geo)by providing N substrates,while K enhances N metabolism efficiency through enzyme activation,indicated by the downregulation of certain genes(hzsB,ACM and Geo)and a negative correlation with N removal by simultaneously increasing gene expression and enzyme activity.These findings provide insights into how N and K together enhance N removal,emphasizing their importance for optimizing this process. 展开更多
关键词 Denitrification Anammox Feammox N and K interactions
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Advances and challenges of sulfur-driven autotrophic denitrification(SDAD)for nitrogen removal 认领 引用 被引量：34
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作者 Jiao-Jiao Wang Bao-Cheng Huang +1 位作者 Jun Li Ren-Cun Jin 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第10期2567-2574,共8页
Sulfur-driven autotrophic denitrification(SDAD),a process suited for the treatment of nitrogen and sulfur-polluted wastewater without extra supplement of organic carbon,is a promising biological nitrogen removal proce... Sulfur-driven autotrophic denitrification(SDAD),a process suited for the treatment of nitrogen and sulfur-polluted wastewater without extra supplement of organic carbon,is a promising biological nitrogen removal process.However,the SDAD process was affected by many factors such as various electron donors,organic carbon and exogenous substances(e.g.,antibiotics and heavy metal),which prevent further application.Thus,we conducted a detailed review of previous studies on such influence factors and its current application.Besides,a comparative analysis was adopted to recognize the current challenges and future needs for feasible application,so as to ultimately perfect the SDAD process and extend its application scope. 展开更多
关键词 Biological nitrogen removal Microbial fuel cell Mixotrophic denitrification Sulfur-oxidizing bacteria(SOB) Sulfur-driven autotrophic denitrification Anammox
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Nitrogen removal and simultaneous nitrification and denitrification in a fluidized bed step-feed process 认领 引用 被引量：23
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作者 BingWang Wei Wang +2 位作者 Hongjun Han Hongbo Hu Haifeng Zhuang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2012年第2期303-308,共6页
For urban wastewater treatment,we conducted a novel four-stage step-feed wastewater treatment system combined with a fluidized bed laboratory experiment to investigate chemical oxygen demand（COD）,NH4＋-N,and total n... For urban wastewater treatment,we conducted a novel four-stage step-feed wastewater treatment system combined with a fluidized bed laboratory experiment to investigate chemical oxygen demand（COD）,NH4＋-N,and total nitrogen（TN） removal performance.The removal rates of COD,NH4＋-N and TN were 88.2%,95.7%,and 86.4% with e？uent concentrations of COD,NH4＋-N and TN less than 50,8,and 10 mg/L,respectively.Biomass and bacterial activities were also measured,with results showing more nitrobacteria in the activated sludge than in the biofilm;however,bacterial activity of the biofilm biomass and the activated sludge were similar.Nitrogen concentrations during the process were also detected,with simultaneous nitrification and denitrification found to be obvious. 展开更多
关键词 denitrification fluidized bed step-feed simultaneous nitrification and denitrification
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Study on the Removal of Nitrogen Content in Wastewater by Autotrophic Denitrification 认领 引用
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作者 Jian XU 《Meteorological and Environmental Research》 2025年第3期71-74,共4页
Sulfur autotrophic denitrification technology is a low-carbon and environmentally friendly wastewater treatment technology.The effects of factors such as pH,temperature,S/N and salinity on the efficiency of sulfur aut... Sulfur autotrophic denitrification technology is a low-carbon and environmentally friendly wastewater treatment technology.The effects of factors such as pH,temperature,S/N and salinity on the efficiency of sulfur autotrophic denitrification reactions were discussed,and the community characteristics of microorganisms were summarized.This article also introduced the future research and development directions of this process. 展开更多
关键词 Autotrophic denitrification Sulfur Influencing factors Microbial community
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Denitrification potential enhancement by addition of external carbon sources in a pre-denitrification process 认领 引用 被引量：41
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作者 PENG Yong-zhen MA Yong WANG Shu-ying 《Journal of Environmental Sciences》 SCIE EI CAS 2007年第3期284-289,共6页
The aim of this study is to investigate the denitrification potential enhancement by addition of external carbon sources and to estimate the denitrification potential for the predenitrification system using nitrate ut... The aim of this study is to investigate the denitrification potential enhancement by addition of external carbon sources and to estimate the denitrification potential for the predenitrification system using nitrate utilization rate （NUR） batch tests. It is shown that the denitrification potential can be substantially increased with the addition of three external carbon sources, i.e. methanol, ethanol, and acetate, and the denitrification rates of ethanol, acetate, and methanol reached up to 9.6, 12, and 3.2 mgN/（g VSS.h）, respectively, while that of starch wastewater was only 0.74 mgN/（g VSS,h）. By comparison, ethanol was found to be the best external carbon source. NUR batch tests with starch wastewater and waste ethanol were carried out. The denitfification potential increased from 5.6 to 16.5 mg NO3-N/L owing to waste ethanol addition. By means of NUR tests, the wastewater characteristics and kinetic parameters can be estimated, which are used to determine the denitrification potential of wastewater, to calculate the denitrification potential of the plant and to predict the nitrate effluent quality, as well as provide information for developing carbon dosage control strategy. 展开更多
关键词 predenitrification process external carbon addition ethanol denitrification potential
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