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Encouraging circular economy and sustainable environmental practices by addressing waste management and biomass energy production 认领 引用 被引量：4
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作者 Nazim Forid ISLAM Bhoirob GOGOI +3 位作者 Rimon SAIKIA Balal YOUSAF Mahesh NARAYAN Hemen SARMA 《Regional Sustainability》 2024年第4期1-15,共15页
The current linear economy assumes abundant,easily accessible,and cost-effective natural resources.However,this assumption is unsustainable,especially considering the world’s current trajectory exceeding the Earth’s... The current linear economy assumes abundant,easily accessible,and cost-effective natural resources.However,this assumption is unsustainable,especially considering the world’s current trajectory exceeding the Earth’s ecological limits.In contrast,circular economy(CE)reduces wastes and improves resource efficiency,making them a more sustainable alternative to the dominant linear model.Biomass energy generated from agricultural leftovers,forestry wastes,and municipal trash provides a renewable substitute for fossil fuels.This reduces greenhouse gas emissions and improves energy security.Proper waste management,including trash reduction,recycling,and innovative waste-to-energy technology,reduces the burden on landfills and incineration and creates renewable energy from materials that would otherwise go to waste.Although integrating these techniques is consistent with the CE’s resource efficiency and waste minimization principles,it requires addressing environmental,technical,and socioeconomic challenges.Given the pressing global issues,transitioning to a CE and implementing sustainable environmental practices are crucial to mitigate the current waste management crisis.The aim of this study is to emphasize the viability of biomass as a source of sustainable energy,the necessity of comprehensive strategies that prioritize ecological sustainability,community involvement,and innovation to achieve a circular principle based future,and the potential obstacles to the implementation of sustainable environmental practices.This study will aid in implementing CE practices to accomplish the Sustainable Development Goals(SDGs)by reducing greenhouse gas emissions and landfill loads.Beyond environmental benefits,it can also bring economic,social,and health improvements.Furthermore,this study will assist societies in addressing global issues,such as resource scarcity,pollution,and climate change,as well as transitioning to a more sustainable and resilient future. 展开更多
关键词 Circular economy Sustainable Development Goals(SDGs) Waste management Greenhouse gas emissions Biomass energy Microbial fuel cell
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A case of gregarious flowering in bamboo, dominated lowland forest of Assam,India: phenology,regeneration,impact on rural economy,and conservation 认领 引用 被引量：4
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作者 Hemen Sarma Ananta Mohan Sarma +1 位作者 Aniruddha Sarma Souravjyoti Borah 《Journal of Forestry Research》 CAS 2010年第4期409-414,521,共6页
We recorded gregarious flowering of three bamboo species viz. Bambusa arundinacea, Bambusa tulda and Melocanna baccifera during rainy season from early March to late May, 2008 at lowland forest of Bajali area of Indo-... We recorded gregarious flowering of three bamboo species viz. Bambusa arundinacea, Bambusa tulda and Melocanna baccifera during rainy season from early March to late May, 2008 at lowland forest of Bajali area of Indo-Burma hotspot region. A regular method of field sampling of various forest types was used to map the bamboo species in Assam, India. Moreover, people＇s perception on bamboo blooming was investigated at 17 sample plots covering 258 respondents inhabiting at the site at an average of 15 in each plots. A floral clump （inflorescence） emerged and developed into a giant panicle comprising of numerous florets. Two types of seeds viz. bacea and caryopsis were recorded in different species. Viviparous germination was noticed in few bacca seeds produced by M. baccifera and this has unusual occurrence in bamboo. Seed viability test shows that 75% caryopsis seeds were viable; these seeds had the potential of germination and can be used for mass regen- eration. Most local respondents believe that bamboo flowering can result in population explosion of rodent, therefore, they think bamboo flower- ing is positively correlated with famine. This traditional belief results in massive destruction of bamboo clumps, which significantly impacts on rural economy. 展开更多
关键词 bamboo famine flowering lndo-Burma hotspot rural economy viviparous germination
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Biosurfactant-assisted phytoremediation of potentially toxic elements in soil:Green technology for meeting the United Nations Sustainable Development Goals 认领 引用 被引量：1
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作者 Songita SONOWAL Amy R.NAVA +5 位作者 Sanket J.JOSHI Siddhartha Narayan BORAH Nazim F.ISLAM Soumya PANDIT Ram PRASAD Hemen SARMA 《Pedosphere》 SCIE CAS CSCD 2022年第1期198-210,共13页
Biosurfactants are biomolecules produced by microorganisms, low in toxicity, biodegradable, and relatively easy to synthesize using renewable waste substrates. Biosurfactants are of great importance with a wide and ve... Biosurfactants are biomolecules produced by microorganisms, low in toxicity, biodegradable, and relatively easy to synthesize using renewable waste substrates. Biosurfactants are of great importance with a wide and versatile range of applications, including the bioremediation of contaminated sites. Plants may accumulate soil potentially toxic elements(PTEs), and the accumulation efficacy may be further enhanced by the biosurfactants produced by rhizospheric microorganisms. Occasionally, the growth of bacteria slows down in adverse conditions, such as highly contaminated soils with PTEs. In this context,the plant's phytoextraction capacity could be improved by the addition of metal-tolerant bacteria that produce biosurfactants. Several sources, categories,and bioavailability of PTEs in soil are reported in this article, with the focus on the cost-effective and sustainable soil remediation technologies, where biosurfactants are used as a remediation method. How rhizobacterial biosurfactants can improve PTE recovery capabilities of plants is discussed, and the molecular mechanisms in bacterial genomes that support the production of important biosurfactants are listed. The status and cost of commercial biosurfactant production in the international market are also presented. 展开更多
关键词 bacterial genome metal-tolerant bacteria phytoextraction technology plant growth-promoting rhizobacteria rhizospheric microorganism
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Localization of polycyclic aromatic hydrocarbons and heavy metals in surface soil of Asia’s oldest oil and gas drilling site in Assam,northeast India:Implications for the bio-economy 认领 引用 被引量：3
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作者 Hemen Sarma N.F.Islam +2 位作者 P.Borgohain A.Sarma M.N.V.Prasad 《Emerging Contaminants》 2016年第3期119-127,共9页
The environmental influx of hazardous contaminants viz PAHs and HMs occurs due to oil and gas drilling,and processing of petroleum products in industrial facilities and refineries.This problem plagues crude oil drilli... The environmental influx of hazardous contaminants viz PAHs and HMs occurs due to oil and gas drilling,and processing of petroleum products in industrial facilities and refineries.This problem plagues crude oil drilling sites as PAHs are an essential component of and HMs coexist with crude oil.We analyzed the spatial distribution of 16 PAHs and 8 HMs in 10 contaminated sites of Assam,a state in India.These included Digboi,where crude oil was drilled in 1867 and the first oil well in Asia that was drilled.TheƩ16 PAHs in soil were detected with a minimum of 13.48 and a maximum of 86.3 mgkg1 andƩ8 heavy metal concentrations in the soil ranged between 69.51 and 336.06 mgkg1.A negative correlation was detected between the relative concentrations of PAHs and HMs.The results confirmed that the nonbiodegradable nature of HMs made them stay in the soil for longer periods of time.In our study,we found that the levels of lead,copper,nickel,and chromium(total)in soil were 73.62,11.86,58.97 and 158.66 mgkg1.The recovery percentage for PAHs and HMs were in the range of 67e97%and 90e95%respectively.Spatial distribution indices for Phenanthrene/Anthracene,Naphthalene/Acenapthhylene,Chyrsene/Benzo(g,h,i)perylene and Fluranthene/Pyrene)calculated for soil samples indicated that the spatial distribution of PAHs in soil is uneven which might be due to variations in contaminates disseminated in soil.Such regionalized concentration has serious implications on the bio-economy both in terms of health and economy,especially since the proximity of crude oil sites to paddy fields and/or tea plantations uniquely marks the landscape of upper Assam. 展开更多
关键词 PAH Heavy metals Spatial distribution indices Oil Drilling site
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