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Pyrite-based mixotrophic denitrification promoted nitrogen removal from actual secondary effluent in natural aerobic environments:Particle-size optimization and microbial synergism 认领 引用
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作者 Yanbo Jiang Minlong Li +3 位作者 Xiaona Zheng Song Liu Xingcan Feng Yuntao Guan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第5期221-230,共10页
Implementing advanced nitrogen removal in wastewater treatment plants has emerged as a critical strategy to comply with tightening global nitrogen discharge mandates.To achieve advanced nitrogen removal under low-carb... Implementing advanced nitrogen removal in wastewater treatment plants has emerged as a critical strategy to comply with tightening global nitrogen discharge mandates.To achieve advanced nitrogen removal under low-carbon treatment conditions,pyrite-based mixotrophic denitrification(PMD)demonstrates promising application prospects.However,existing research predominantly focuses on synthetic wastewater in laboratory settings,with insufficient attention to practical applications using complex real wastewater.This study investigated PMD treating actual secondary effluent(TN:16-25 mg/L)from a full-scale wastewater treatment plant under natural aerobic conditions.Through optimized pyrite particle size(1.2-2.4 mm)and carbon-to-nitrogen ratio(C/N=3:1),PMD achieved 90.8%TN removal efficiency with effluent TN<2 mg/L,meeting stringent discharge standards.Under optimized conditions,oxygen boosted S2-/Fe2+release from pyrite.The 1.2-2.4 mm particles created micro-aerobic and micro-anaerobic niches,which facilitated synergistic symbiosis between autotrophic and heterotrophic denitrifiers.This microbial collaboration endowed the system with enhanced denitrification performance and improved filtration characteristics.The dominant bacterial genera in optimal conditions were unclassified_f_Rhodocyclaceae(22.4%),unclassified_f_Comamonadaceae(16.3%),and Thauera(5.9%),while nirK-type denitrifying bacteria dominated the denitrification in this system.This research offers valuable recommendations for developing an energy-efficient and low-carbon advanced nitrogen removal process in wastewater treatment facilities. 展开更多
关键词 Pyrite particle size Natural aerobic Actual secondary effluent Advanced nitrogen removal Microbial synergism
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Efficient alleviation of ultrafiltration membrane fouling in treatment of dye effluent by a novel cationic dendritic starch-based flocculant 认领 引用
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作者 Yuyang Wang Wenxiao Ren Hu Yang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第5期544-556,共13页
Dye effluent has become a challenging problem in wastewater treatment.Ultrafiltration(UF)is a popular method to purify dye effluent,but membrane fouling is a major problem seriously restricting its wide applications.A... Dye effluent has become a challenging problem in wastewater treatment.Ultrafiltration(UF)is a popular method to purify dye effluent,but membrane fouling is a major problem seriously restricting its wide applications.A novel cationic dendritic starch-based flocculant(CL-CS-G)was designed and fabricated.The performance and mechanism of CL-CS-G in alleviation of membrane fouling during the successive flocculation-UF treatment of Acid Green 25 effluent,a typical industrial dye,were evaluated.Compared with polyaluminum chloride(PAC),CL-CS-G showed a lower loss of water flux but a less required dosage,besides,this dendritic flocculant could effectively reduce both reversible and irreversible fouling,and its irreversible fouling resistance was even reduced by 91.2%,because of its distinct structural feature.The hyperbranched structure of CL-CS-G,with relatively loose and net-like configuration but also abundant reactive end-groups contained,caused higher bridging and sweeping flocculation effects in addition to charge neutralization;moreover,produced larger but looser dye flocs,than PAC and its linear analogue,resulting in a looser and porous cake layer,more easily cleaned up,and thus a higher efficiency in alleviation of membrane fouling.The high performance of CL-CS-G in flocculation and alleviation of membrane fouling was confirmed by its high economical efficiency,good reusability of the treated membrane,and effective purification of two other dye effluents and a simulated real dye mixture.CL-CS-G is an efficient,low cost and environmental-friendly flocculant,and thus has high application potentials in pretreatment of dye effluents and alleviation of membrane fouling. 展开更多
关键词 Membrane fouling control Flocculation pretreatment Dye effluent Dendritic starch-based flocculant Alleviation performance and mechanisms
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Heterogeneity in the molecular composition of effluent organic matter from petrochemical wastewater treatment plants in China 认领 引用
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作者 Yue Kou Huang-Fan Ye +9 位作者 Rui Zhang Wen-Yi Lu Ze-Lin Niu Yi-Fei Zhu Zhuo-Yu Li Chen He Hai-Feng Wang Qing-Hong Wang Quan Shi Chun-Mao Chen 《Petroleum Science》 SCIE EI CAS CSCD 2026年第4期2216-2230,共15页
The proliferation of petrochemical plants close to natural water bodies has resulted in emission of numerous organic pollutants into aquatic environments.However,the molecular composition of petrochemical effluent org... The proliferation of petrochemical plants close to natural water bodies has resulted in emission of numerous organic pollutants into aquatic environments.However,the molecular composition of petrochemical effluent organic matter(PEfOM)is poorly understood,which results in uncertainty regarding its environmental effects and potential risks.In this study,optical spectroscopy and mass spectrometry coupled with both negative-ion((-)ESI mode)and positive-ion electrospray ionization mode((+)ESI mode)were used to conduct large-scale molecular-level characterization of PEfOM from 21 petrochemical plants in China.In contrast to natural organic matter(NOM),PEfOM was characterized by low aromaticity and high microbial-derived fluorescence.These properties corresponded to a composition rich in aliphatic and highly unsaturated phenolic compounds,as well as low average molecular weight and elevated heteroatom content.Among the 21 PEfOM samples,molecular compositions exhibited significant heterogeneity with Jensen–Shannon divergence values between 0 and 0.2.Based on the O/S/N contents,aromaticity,and unsaturation,the compounds in PEfOM were grouped into three clusters under(+)ESI mode(+CL1,+CL2,+CL3)and two clusters under(-)ESI mode(-CL1 and-CL2).Nitrogen-rich CHON compounds with high double bond equivalents(4–14)in+CL2 and oxygen-poor compounds with high molecular weights(600–800 Da)in-CL1 exhibited the greatest reactivity in aquatic environments under aerobic conditions.The compounds in these(+)ESI and(-)ESI clusters had Gibbs's free energy of carbon oxidation values of 80–110 and 60–100,respectively.C17H23N1O2(quinolinium derivatives),C14H20O5S1(benzene sulfonic acid),and C9H17N1O5S1(aminosulfonates)were identified as characteristic pollutants with high indicator species values.Ecological structure activity relationships analysis revealed that C17H23N1O2 exhibited high acute biotoxicity,which was associated with potential environmental risks.This study offers valuable insight and guidance for risk management and control of petrochemical effluents. 展开更多
关键词 Effluent organic matter Petrochemical wastewater Molecular characteristic Heterogeneity Orbitrap mass spectrometry
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A droplet-based electricity generators(DEGs)system for harvesting secondary effluent energy 认领 引用
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作者 Hongmei Ma Beidou Xi +3 位作者 Yongzhi Chen Hong Liu Weiwei Li Zhiqiang Tang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第3期545-554,共10页
The secondary effluent in municipal wastewater contains considerable amounts of low-frequency and low-energy components that can be effectively harvested using the triboelectric nanogenerator technology.A systematic i... The secondary effluent in municipal wastewater contains considerable amounts of low-frequency and low-energy components that can be effectively harvested using the triboelectric nanogenerator technology.A systematic investigation was conducted into the output performance of diverse droplet-based electricity generators(DEGs).The results showed that the DEGs system could harvest energy from secondary effluents.This energy was then used in the treatment of municipal wastewater to remove ammonium nitrogen(NH4+-N)and chemical oxygen demand(COD),and to degrade the methyl orange(MO)solution.The results demonstrated that a single DEG device can achieve a maximum voltage of 22.47 V,high current of 2.11μA,and peak power of 15.18μW.After rectifying the DEGs output,the overall output performance of the DEGs system increased as the number of DEGs in the system increased.Moreover,the study revealed that the DEGs system achieved a removal efficiency of 12%for NH4+-N and 40%for COD.Furthermore,after the degradation of MO solution by the DEGs system without external power supply for a period of 42 h,the characteristic peaks of the UV-Visible spectroscopy(271 and464 nm)of the MO solution exhibited a notable reduction.Additionally,the removal efficiency of 91.31%for COD and decolorization rate of 96.08%for MO solution.Thus,this study demonstrates the application of TENG technology in energy harvesting from secondary effluents and presents a novel approach for carbon reduction in municipal wastewater plants. 展开更多
关键词 Droplet-based electricity generator(DEG) Secondary effluent Removed NH4+-N Removed COD Methyl orange degradation
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Fate of microplastics in urban wastewater treatment plants and their contribution to the receiving river via effluent discharge 认领 引用 被引量：1
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作者 Qianhua ZHANG Shujie ZHOU +3 位作者 Zeyu LI Yuan ZHANG Wenxin OUYANG Lei MAI 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2025年第2期372-382,共11页
Effluents from wastewater treatment plants(WWTPs)are recognized as an important source for microplastic(MP)pollution in the receiving waters.The removal efficiency of MPs in WWTPs and the discharge flux remain largely... Effluents from wastewater treatment plants(WWTPs)are recognized as an important source for microplastic(MP)pollution in the receiving waters.The removal efficiency of MPs in WWTPs and the discharge flux remain largely unknown.The present study measured the MP abundances in the influents,effluents,and activated sludge in four domestic and one industrial WWTPs in Guangzhou,China.The MP abundance detected in influent samples were approximately one order of magnitude higher than those found in effluents,resulting in high removal efficiencies of MPs(97.4%-98.7%)in these WWTPs.A significant amount of the removed MPs deposited in the activated sludge,with abundances of MPs ranging from 7 to 888 pieces/g dry weight sludge.Microplastics remaining in effluents were discharged into the receiving river with releasing rates of ranging from(1.1±1.0)×107to(4.54±3.92)×109pieces per day.Results obtained in the present study suggest that the contribution of MPs from WWTPs to the aquatic environment is non-negligible and the application of sludge in the agricultural environment may bring additional MP pollution to agricultural soils. 展开更多
关键词 microplastic(MP) wastewater treatment plant(WWTP) activated sludge influent and effluent discharge flux
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Development of wastewater treatment methods for palm oil mill effluent(POME):A comprehensive review 认领 引用 被引量：1
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作者 Andriy Anta Kacaribu Yuliani Aisyah +1 位作者 Febriani Darwin 《Resources Chemicals and Materials》 2025年第4期43-69,共27页
As the world’s largest palm oil producer,Indonesia significantly benefits from its palm oil industry but also faces serious environmental challenges from palm oil mill effluent(POME)-a high-strength wastewater contai... As the world’s largest palm oil producer,Indonesia significantly benefits from its palm oil industry but also faces serious environmental challenges from palm oil mill effluent(POME)-a high-strength wastewater containing substantial organic matter,nutrients,suspended solids,and various chemical compounds.Sustainable and effective wastewater treatment strategies are urgently needed to address this issue.This review presents a comprehensive analysis of existing POME treatment technologies,including anaerobic digestion(AD),advanced oxidation processes(AOPs),membrane filtration,adsorption,phytoremediation,and microalgae-based systems.Each method is examined in terms of treatment efficiency,operational feasibility,and potential for imple-mentation under Indonesian conditions.While advanced processes,such as AOPs and membrane filtration,achieve high pollutant removal,they are often limited by operational costs.In contrast,biological approaches,such as AD and phytoremediation,offer both environmental benefits and economic value through the recovery of biogas,biofertilizers,and biomass.This review highlights the potential for integrating wastewater purification with resource recovery and valorization,supporting a shift toward more circular and sustainable management of POME.The insights provided are intended to guide future research,inform policy decisions,and facilitate the industrial adoption of optimized treatment systems. 展开更多
关键词 Palm oil mill effluent(POME) Wastewater treatment Chemical treatment Physical treatment Biological treatment Sustainable technologies Resource recovery
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Effects of different types of nutrient effluent from shrimp ponds on the seedling growth of Kandelia obovata 认领 引用 被引量：1
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作者 TIAN Yuan CHEN Guangcheng +2 位作者 TANG Feilong ZHENG Chunfang YE Yong 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2018年第6期112-120,共9页
Extensive shrimp ponds are located next to the landward edges of most of mangrove forests in China. A shrimp pond may influence mangroves by（1） routine effluent between pond and tide, and（2） dredging effluent from... Extensive shrimp ponds are located next to the landward edges of most of mangrove forests in China. A shrimp pond may influence mangroves by（1） routine effluent between pond and tide, and（2） dredging effluent from pond-dredging at least once a year. Our study consisted of two experiments to study the effects of these two effluents on the seedling growth of Kandelia obovata. One experiment simulated the effects of routine effluents.The other simulated four sedimentation thicknesses（0 cm, 2 cm, 4 cm, 8 cm） over mangrove soils by dredging effluent from pond-dredging, and revealed the cumulative effects of dredging effluents on K. obovata. At each of the three fixed salinities, i.e., 5, 15 and 25, routine effluent did not result in significant differences in each of the measured growth parameters of K. obovata seedlings. However, effects of dredging effluent on seedling growth of K. obovata were related with sedimentation thickness. Most growth parameters showed maximum values at sedimentation thickness 4 cm. The data indicated that K. obovata accelerated its growth under moderate sedimentation thicknesses and it was tolerant and adaptable to shrimp pond-cleaning effluent sediments up to about 8 cm in our experiment. 展开更多
关键词 routine effluent dredging effluent shrimp pond excessive nutrients biomass allocation mangroves
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Effects of effluent organic matters on endocrine disrupting chemical removal by ultrafiltration and ozonation in synthetic secondary effluent 认领 引用 被引量：4
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作者 Xiurong Si Zunfang Hu +1 位作者 Ding Ding Xu Fu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2019年第2期57-64,共8页
Endocrine disrupting chemicals(EDCs) in the secondary effluent discharged from wastewater treatment plants are of great concern when water reuse is intended. Ozonation and ultrafiltration(UF) are powerful technologies... Endocrine disrupting chemicals(EDCs) in the secondary effluent discharged from wastewater treatment plants are of great concern when water reuse is intended. Ozonation and ultrafiltration(UF) are powerful technologies reported to eliminate EDCs. Due to the importance of effluent organic matters(EfOMs) in secondary effluent, the effects of three kinds of EfOM on the treatment of five EDCs using ozonation and UF were investigated. The three kinds of EfOM studied were humic acid sodium salt(NaAH), bovine serum albumin(BSA)and sodium alginate(NaAg); and the five EDCs were estrone, 17β-estradiol, estriol, 17α-ethynyl estradiol and bisphenol A. The results showed that EfOM accelerated the decay rate of ozone and inhibited the degradation efficiency of EDCs by ozonation in the order NaAH > BSA > NaAg.The ultraviolet absorbance at 280 nm(UVA280) has potential for use as a surrogate indicator to assess EDC removal via ozonation without conducting difficult EDC analyses. When the decline in UVA280 exceeded 18%, the five EDCs had been completely removed. The UF behavior of NaAH,BSA and NaAg was found to follow the cake filtration law. The fouling potential of EfOM followed the order NaAg > NaAH > BSA; while EfOM on the membrane surface enhanced EDC removal in the order NaAH > BSA > NaAg. The mean retention rate of the membrane was increased by 24%, 10% and 8%, respectively. The properties of EDCs and EfOM cakes both influenced the EDC removal rates due to adsorption, size exclusion and charge attraction. 展开更多
关键词 Endocrine disrupting chemicals Ultrafiltration Ozonation Effluent organic matters Secondary effluent
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Pollutant emission reduction effect through effluent tax,concentration-based effluent standard,or both 认领 引用 被引量：2
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作者 Kunyu Niu Zhongshan Tian Jie Xue 《Chinese Journal of Population,Resources and Environment》 2016年第2期68-80,共13页
There are numerous studies comparing different kinds of environmental taxes and standards.However,forms of environmental standards focused by former researchers are usually quantitybased limits/standards(e.g.pounds pe... There are numerous studies comparing different kinds of environmental taxes and standards.However,forms of environmental standards focused by former researchers are usually quantitybased limits/standards(e.g.pounds per day or pounds per unit of output).Concentration-based emission standard(e.g.milligrams per liter of wastewater) as one important form of environmental standard has not been given much attention.In this article,comparable estimates of their probable effect on enterprise pollution reduction will be developed for concentrationbased effluent standards,effluent taxes,and a combination of both.A linear simulation model is used to clearly and obviously compare the effects of effluent taxes and concentration-based standards within the same figure.With one detailed application to the paper industry,some enlightenment and conclusions-as well as the general applicability of these principles-are then provided:Under the same effluent tax rate,enterprises,groups,and industries that are cleaner will reduce more pollutants than those that have higher pollutant abatement costs.It is recommended that effluent taxes are set by avoiding cutting it even at one stroke and considering the feasibility of pollution-reducing technology in various industries.It is necessary to reduce MAC of enterprises to better stimulate enterprises' or industries' emission reduction by preferential measures,such as high tax rate coordinated by speeding up the depreciation of environmental protection equipment. 展开更多
关键词 Concentration-based effluent standard effluent tax emission reduction effect(ERE) marginal abatement cost(MAC)
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Startup and operation of anaerobic EGSB reactor treating palm oil mill effluent 认领 引用 被引量：18
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作者 ZHANG Yejian YAN Li +3 位作者 CHI Lina LONG Xiuhua MEI Zhijian ZHANG Zhenjia 《Journal of Environmental Sciences》 SCIE EI CAS 2008年第6期658-663,共6页
A bench-scale expanded granular sludge bed （EGSB） reactor was applied to the treatment of palm oil mill effluent （POME）. The reactor had been operated continuously at 35℃ for 514 d, with organic loading rate （OL... A bench-scale expanded granular sludge bed （EGSB） reactor was applied to the treatment of palm oil mill effluent （POME）. The reactor had been operated continuously at 35℃ for 514 d, with organic loading rate （OLR） increased from 1.45 to 17.5 kg COD/（m^3·d）. The results showed that the EGSB reactor had good performance in terms of COD removal on the one hand, high COD removal of 91% was obtained at two days＇ of hydraulic retention time （HRT）, and the highest OLR of 17.5 kg COD/（m^3·d）. On the other hand, only 46% COD in raw POME was transformed into biogas in which the methane content was about 70% （V/V）. A 30-d intermittent experiment indicated that the maximum transformation potential of organic matter in raw POME into methane was 56%. Volatile fatty acid （VFA） accumulation was observed in the later operation stage, and this was settled by supplementing trace metal elements. On the whole, the system exhibited good stability in terms of acidity and alkalinity. Finally, the operational problems inherent in the laboratory scale experiment and the corresponding countermeasures were also discussed. 展开更多
关键词 palm oil mill effluent mesophilic anaerobic digestion expanded granular sludge bed （EGSB）
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Dissolved organic matter removal using magnetic anion exchange resin treatment on biological effluent of textile dyeing wastewater 认领 引用 被引量：17
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作者 Jun Fan Haibo Li +2 位作者 Chendong Shuang Wentao Li Aimin Li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2014年第8期1567-1574,共8页
This study investigated the removal of dissolved organic matter（DOM） from real dyeing bio-treatment effluents（DBEs） with the use of a novel magnetic anion exchange resin（NDMP）.DOMs in two typical DBEs were fract... This study investigated the removal of dissolved organic matter（DOM） from real dyeing bio-treatment effluents（DBEs） with the use of a novel magnetic anion exchange resin（NDMP）.DOMs in two typical DBEs were fractionized using DAX-8/XAD-4 resin and ultrafiltration membranes. The hydrophilic fractions and the low molecular weight（MW）（〈3 kDa） DOM fractions constituted a major portion（〉50%） of DOMs for the two effluents. The hydrophilic and low MW fractions of both effluents were the greatest contributors of specific UV254absorbance（SUVA254）,and the SUVA254 of DOM fractions decreased with hydrophobicity and MW. Two DBEs exhibited acute and chronic biotoxicities. Both acute and chronic toxicities of DOM fractions increased linearly with the increase of SUVA254 value. Kinetics of dissolved organic carbon（DOC） removal via NDMP treatment was performed by comparing it with that of particle active carbon（PAC）. Results indicated that the removal of DOC from DBEs via NDMP was 60%,whereas DOC removals by PAC were lower than 15%. Acidic organics could be significantly removed with the use of NDMP. DOM with large MW in DBE could be removed significantly by using the same means. Removal efficiency of NDMP for DOM decreased with the decrease of MW. Compared with PAC,NDMP could significantly reduce the acute and chronic bio-toxicities of DBEs. NaCl/NaOH mixture regenerants,with selected concentrations of 10% NaCl（m/m）/1%NaOH（m/m）,could improve desorption efficiency. 展开更多
关键词 Textile dyeing Secondary/biological effluent Advanced treatment Magnetic resin Anion exchange
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Performance of Nanofiltration and Reverse Osmosis Membranes in Metal Effluent Treatment 认领 引用 被引量：22
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作者 刘飞妮 张国亮 +1 位作者 孟琴 章宏梓 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2008年第3期441-445,共5页
The performance of different nanofiltration （NF） and reverse osmosis （RO） membranes was studied in treating the toxic metal effluent from metallurgical industry. The characteristics and filtration behavior of the ... The performance of different nanofiltration （NF） and reverse osmosis （RO） membranes was studied in treating the toxic metal effluent from metallurgical industry. The characteristics and filtration behavior of the processes including the wastewater flux, salt rejection and ion rejection versus operating pressure were evaluated. Then the wastewater flux of RO membrane was compared with theoretical calculation using mass transfer models, and good consistency was observed. It was found that a high rejection rate more than 95% of metal ions and a low Chemical Oxygen Demand （COD） value of 10 mg·L^-1 in permeate could be achieved using the RO composite membrane, while the NF rejection of the salt could be up to 78.9% and the COD value in the permeate was 35 mg·L^-1. The results showed that the product water by both NF and RO desalination satisfied the State Reutilization Qualification, but NF would be more suitable for large-scale industrial practice, which offered significantly higher permeate flux at low operating pressure. 展开更多
关键词 nanofiltration reverse osmosis metal effluent reuse
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Characteristics of contaminants in water and sediment of a constructed wetland treating piggery wastewater effluent 认领 引用 被引量：14
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作者 Soyoung Lee Marla C.Maniquiz Lee-Hyung Kim 《Journal of Environmental Sciences》 SCIE EI CAS 2010年第6期940-945,共6页
Constructed wetland （CW） is the preferred means of controlling water quality because of its natural treatment mechanisms and function as a secondary or tertiary treatment unit. CW is increasingly applied in Korea fo... Constructed wetland （CW） is the preferred means of controlling water quality because of its natural treatment mechanisms and function as a secondary or tertiary treatment unit. CW is increasingly applied in Korea for secondary effluent of livestock wastewater treatment. This study was conducted to recognize the characteristics of contaminants in the accumulated sediment at the bottom soil layer and to reduce the phosphorus release from sediments of the free water surface CW for the treatment of secondary piggery wastewater effluent from a livestock wastewater treatment facility. The results revealed that the dominant phosphorus existence types at near the inlet of the CW were non-apatite phosphorus （59%） and residual phosphorus （32%） suggesting that most of the particles of the influent are made up of inorganic materials and dead cells. Sediment accumulation is important when determining the long-term maintenance requirements over the lifetime of CW. Continuous monitoring will be performed for a further assessment of the CW system and design. 展开更多
关键词 constructed free water surface wetland piggery wastewater phosphorus type secondary wastewater effluent sediment
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Degradation behavior of 17α-ethinylestradiol by ozonation in the synthetic secondary effluent 认领 引用 被引量：5
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作者 Zheyun Zhang Hongtao Zhu +1 位作者 Xianghua Wen Xiurong Si 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2012年第2期228-233,共6页
Endocrine disrupting chemicals（EDCs） in the secondary effluent discharged from wastewater treatment plants（WWTPs） are of great concern in the process of water reuse.Ozonation has been reported as a powerful oxidat... Endocrine disrupting chemicals（EDCs） in the secondary effluent discharged from wastewater treatment plants（WWTPs） are of great concern in the process of water reuse.Ozonation has been reported as a powerful oxidation technology to eliminate micropollutants in water treatment.Due to the complexity of the wastewater matrix,orthogonal experiments and single factor experiments were conducted to study the influence of operational parameters on the degradation of 17α-ethinylestradiol（EE2） in the synthetic secondary effluent.The results of the orthogonal experiments indicated that the initial ozone and natural organic matter（NOM） concentration significantly affected EE2 degradation efficiency,which was further validated by the single factor confirmation experiments.EE2 was shown to be effectively degraded by ozonation in the conditions of low pH（6）,NOM（10 mg/L）,carbonate（50 mg/L）,but high suspended solid（20 mg/L） and initial ozone concentration（9 mg/L）.The study firstly revealed that the lower pH resulted in higher degradation of EE2 in the synthetic secondary effluent,which differed from EDCs ozonation behavior in pure water.EE2 degradation by ozone molecule instead of hydroxyl radical was proposed to play a key role in the degradation of EDCs by ozonation in the secondary effluent.The ratio between O3 and TOC was identified as an appropriate index to assess the degradation of EE2 by ozonation in the synthetic secondary effluent. 展开更多
关键词 ozonation EE2 pH natural organic matter secondary effluent
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Enhancing treatment efficiency of swine wastewater by effluent recirculation in vertical-flow constructed wetland 认领 引用 被引量：8
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作者 HE Lian-sheng LIU Hong-liang +1 位作者 XI Bei-dou ZHU Ying-bo 《Journal of Environmental Sciences》 SCIE EI CAS 2006年第2期221-226,共6页
Livestock wastewater has been a major contributor to Chinese cultural eutrophication of surface waters. Constructed wetlands are under study as a best management practice to treat wastewater from dairy and swine opera... Livestock wastewater has been a major contributor to Chinese cultural eutrophication of surface waters. Constructed wetlands are under study as a best management practice to treat wastewater from dairy and swine operations, but the removal efficiency of pollutants is relatively low. Enhancing the treatment efficiency of livestock wastewater by effluent recirculation was investigated in a pilot-scale vertical-flow constructed wetland. The wetland system was composed of downflow and upflow stages, on which narrow-leaf Phragmites communis and common reed Phragraites Typhia are planted, respectively; each stage has a dimension of 4 m^2 （2 m × 2 m）. Wastewater from facultative pond was fed into the system intermittently at a flow rate of 0.4 m^3/d. Recirculation rates of 0, 25%, 50%, 100% and 150% were adopted to evaluate the effect of the recirculation rate on pollutants removal. It shows that with effluent recirculation the average removal efficiencies of NH4-N, biological oxygen demand （BOD5） and suspended solids（SS） obviously increase to 61.7%, 81.3%, and 77.1%, respectively, in comparison with the values of 35.6%, 50.2%, and 49.3% without effluent recirculation. But the improvement of TP removal is slight, only from 42.3% to 48.9%. The variations of NH4-N, dissolved oxygen（DO） and oxidation-reduction potential（ORP） of inflow and outflow reveal that the adoption of effluent recirculation is benefi- cial to the formation of oxide environment in wetland. The exponential relationships with excellent correlation coefficients （R2 〉0.93） are found between the removal rates of NH4-N and BOD5 and the recirculation rates. With recirculation the pH value of the outflow decreases as the alkalinity is consumed by gradually enhanced nitrification process. When recirculation rate is kept constant 100%, the ambient temperature appears to affect NH4-N removal, but does not have significant influence on BOD5 removal. 展开更多
关键词 vertical-flow constructed wetland swine wastewater effluent recirculation recirculation rate nitrification
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Algal toxicity induced by effluents from textiledyeing wastewater treatment plants 认领 引用 被引量：10
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作者 Hualing Cai Jieying Liang +2 位作者 Xun-an Ning Xiaojun Lai Yang Li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2020年第5期199-208,共10页
This research aimed to evaluate the alga Scenedesmus obliquus toxicity induced by textiledyeing effluents(TDE).The toxicity indicator of TDE in alga at the physiological(algal growyth),biochemical(chlorophyll-a(Chl-a)... This research aimed to evaluate the alga Scenedesmus obliquus toxicity induced by textiledyeing effluents(TDE).The toxicity indicator of TDE in alga at the physiological(algal growyth),biochemical(chlorophyll-a(Chl-a)synthesis and superoxide dismutase(SOD)activity)and structural(cell membrane integrity)level were investigated.Then we further study the relationship among toxicity indicators at physiological and biochemical level,and supplemented by research on algal biomacromolecules.According to the analysis of various endpoints of the alga,the general sensitivity sequence of toxicity endpoints of Scenedesmus obliquus was:SOD activity>Chl-a synthesis>algal growth.The stimulation rate of SOD activity increased from day 3(57.25%~83.02%)to day 6(57.25%~103.81%),and then decreased on day 15(-4.23%^-32.96%),which indicated that the antioxidant balance system of the algal cells was destroyed.The rate of Chl-a synthesis inhibition increased gradually,reaching19.70%~79.39%on day 15,while the rate of growth inhibition increased from day 3(-12.90%~10.16%)to day 15(-21.27%~72.46%).Moreover,the algal growth inhibition rate was positively correlated with the inhibition rate of SOD activity or Chl-a synthesis,with the correlation coefficients were 0.6713 and 0.5217,respectively.Algal cells would be stimulating to produce excessive reactive oxygen species,which would cause peroxidation in the cells,thereby destroying chloroplasts,inhibiting chlorophyll synthesis and reducing photosynthesis.With increasing exposure time,irreversible damage to algae can lead to death.This study is expected to enhance our understanding of the ecological risks through algal tests caused by TDE. 展开更多
关键词 Textile-dyeing effluent Ecotoxicity Alga Dissolved organic matter Lipid peroxidation Metabolic activation
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Acute effects of chlorpyryphos-ethyl and secondary treated effluents on acetylcholinesterase and butyrylcholinesterase activities in Carcinus maenas 认领 引用 被引量：4
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作者 Jihene Ghedira Jamel Jebali +3 位作者 Zied Bouraoui Mohamed Banni Lassaad Chouba Hamadi Boussetta 《Journal of Environmental Sciences》 SCIE EI CAS 2009年第10期1467-1472,共6页
The acute effects of commercial formulation of chlorpyrifos-ethyl （Dursban ） and the secondary treated industrial/urban effluent （STIUE） exposure on acetylcholinesterase （ACHE） and butyrylcholinesterase （BuChE... The acute effects of commercial formulation of chlorpyrifos-ethyl （Dursban ） and the secondary treated industrial/urban effluent （STIUE） exposure on acetylcholinesterase （ACHE） and butyrylcholinesterase （BuChE） activities in hepatopancreas and gills of Mediterranean crab Carcinus maenas were investigated. After 2 d of exposure to chlorpyriphos-ethyl, the AChE activity was inhibited in both organs at concentrations of 3.12 and 7.82 μg/L, whereas the BuCHE was inhibited only at higher concentration 7.82 μg/L of commercial preparation Dursban~. The exposure of crabs to Dursban （3.12 μg/L） showed a significant decrement of ACHE activity at 24 and 48 h, whereas the BuChE was inhibited only after 24 h and no inhibition for both enzymes was observed after 72 h. Moreover, a significant repression of AChE activity was observed in both organs of C. maenas exposed to 5% of STIUE. Our experiments indicated that the measurement of AChE activity in gills and hepatopancreas of C. maenas would be useful biomarker of organophosphorous （OP） and of neurotoxic effects of STIUE in Tunisia. 展开更多
关键词 acetylcholinesterase butyrylcholinesterase organophosphorous Dursban secondary treated industrial/urban effluent Carcinus maenas
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Tomato Yield and Quality and Emitter Clogging as Affected by Chlorination Schemes of Drip Irrigation Systems Applying Sewage Effluent 认领 引用 被引量：14
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作者 LI Jiu-sheng LI Yan-feng ZHANG Hang 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2012年第10期1744-1754,共11页
Chlorination has been recognized as an efficient and economically favorable method for treating clogging in drip emitters caused by biological growth during sewage application. Further important criteria for determini... Chlorination has been recognized as an efficient and economically favorable method for treating clogging in drip emitters caused by biological growth during sewage application. Further important criteria for determining an optimal chlorination scheme are the different responses of crops to the chloride added into the soil through chlorination. During two seasons in 2008 and 2009, field experiments were conducted in a solar-heated greenhouse with drip irrigation systems applying secondary sewage effluent to tomato plants to investigate the influences of chlorine injection intervals and levels on plant growth, yield, fruit quality, and emitter clogging. Injection intervals ranging from 2 to 8 wk and injection concentrations ranging 2-50 mg L-1 of free chlorine residual at the end of the laterals were used. For the 2008 experiments, the yield from the treatments of sewage application with chlorination was 7.5% lower than the yield from the treatment of sewage application without chlorination, while the yields for the treatments with and without chlorination were similar for the 2009 experiments. The statistical tests indicated that neither the chlorine injection intervals and concentrations nor the interactions between the two significantly influenced plant height, leaf area, or tomato yield for both years. The qualities of the fruit in response to chlorination were parameter-dependent. Chlorination did not significantly influence the quality of ascorbic acid, soluble sugar, or soluble acids, but the interaction between the chlorine injection interval and the chlorine concentration significantly influenced the levels of soluble solids. It was also confirmed that chlorination was an effective method for reducing biological clogging. These results suggested that chlorination is safe for a crop that has a moderate sensitivity to chlorine, like tomato, and can maintain a high level of performance in drip irrigation systems applying sewage effluent. 展开更多
关键词 chlorination drip irrigation emitter clogging fruit quality tomato sewage effluent yield
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Molecular characterization of effluent organic matter in secondary effluent and reclaimed water:Comparison to natural organic matter in source water 认领 引用 被引量：12
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作者 Xin Wang Juan Wang +2 位作者 Kuixiao Li Haifeng Zhang Min Yang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2018年第1期140-146,共7页
Municipal wastewater reclamation is becoming of increasing importance in the world to solve the problem of water scarcity. A better understanding of the molecular composition of effluent organic matter（Ef OM） in the... Municipal wastewater reclamation is becoming of increasing importance in the world to solve the problem of water scarcity. A better understanding of the molecular composition of effluent organic matter（Ef OM） in the treated effluents of municipal wastewater treatment plants（WWTPs） is crucial for ensuring the safety of water reuse. In this study, the molecular composition of Ef OM in the secondary effluent of a WWTP in Beijing and the reclaimed water further treated with a coagulation–sedimentation–ozonation process were characterized using a non-target Fourier transform ion cyclotron resonance mass spectrometry（FT-ICR MS） method and compared to that of natural organic matter（NOM） in the local source water from a reservoir. It was found that the molecular composition of Ef OM in the secondary effluent and reclaimed water was dominated by CHOS formulas, while NOM in the source water was dominated by CHO formulas. The CHO formulas of the three samples had similar origins. Anthropogenic surfactants were responsible for the CHOS formulas in Ef OM of the secondary effluent and were not well removed by the coagulation-sedimentation-ozonation treatment process adopted. 展开更多
关键词 Secondary effluent Reclaimed water Source water Effluent organic matter Natural organic matter FT-ICR MS
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Removal of phenol by activated carbons prepared from palm oil mill effluent sludge 认领 引用 被引量：3
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作者 Md. Zahangir ALAM Suleyman A. MUYIBI +1 位作者 Mariatul F. MANSOR Radziah WAHID 《Journal of Environmental Sciences》 SCIE EI CAS 2006年第3期446-452,共7页
The study was attempted to produce activated carbons from palm oil mill effluent （POME） sludge. The adsorption capacity of the activated carbons produced was evaluated in aqueous solution of phenol. Two types of act... The study was attempted to produce activated carbons from palm oil mill effluent （POME） sludge. The adsorption capacity of the activated carbons produced was evaluated in aqueous solution of phenol. Two types of activation were followed, namely, thermal activation at 300, 500 and 800%, and physical activation at 150% （boiling treatment）. A control （raw POME sludge） was used to compare the adsorption capacity of the activated carbons produced. The results indicated that the activation temperature of 800℃ showed maximum absorption capacity by the activated carbon （POME 800） in aqueous solution of phenol. Batch adsorption studies showed an equilibrium time of 6 h for the activated carbon of POME 800. It was observed that the adsorption capacity was higher at lower values ofpH （2--3） and higher value of initial concentration of phenol （200--300 mg/L）, The equilibrium data were fitted by the Langmuir and Freundlich adsorption isotherms. The adsorption of phenol onto the activated carbon POME 800 was studied in terms of pseudo-first and second order kinetics to predict the rate constant and equilibrium capacity with the effect of initial phenol concentrations. The rate of adsorption was found to be better correlation for the pseudo-second order kinetics compared to the first order kinetics. 展开更多
关键词 activated carbon adsorption palm oil mill effluent （POME） sludge phenol
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