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环境科学与生态技术（英文）
环境科学与生态技术（英文）
环境科学与生态技术（英文）/Journal Environmental Science & EcotechnologySCI
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    Enhanced nitrate reduction in hypotrophic waters with integrated photocatalysis and biodegradation

    Bingjie XueLi TianYaqi LiuLingxiu Peng...
    133-140页
    查看更多>>摘要：Addressing nitrate contamination in water bodies is a critical environmental challenge,and Intimately Coupling Photocatalysis and Biodegradation(ICPB)presents a promising solution.However,there is still debate about the effectiveness of ICPB in reducing nitrate under hypotrophic conditions.Further research is needed to understand its microbial metabolic mechanism and the functional changes in bacterial structure.Here we explored microbial metabolic mechanisms and changes in bacterial structure in ICPB reactors integrating a meticulously screened TiC2/g-C3N4 photocatalyst with biofilm.We achieved a 26.3％increase in nitrate reduction using 12.2％less organic carbon compared to traditional biodegra-dation methods.Metagenomic analysis of the microbial communities in ICPB reactors revealed evolving metabolic pathways conducive to nitrate reduction.This research not only elucidates the photocatalytic mechanism behind nitrate reduction in hypotrophic conditions but also provides genomic insights that pave the way for alternative approaches in water remediation technologies.
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    Exploring the complex trade-offs and synergies of global ecosystem services

    Jinnan WangWenjun WuMeng YangYueming Gao...
    141-148页
    查看更多>>摘要：The trade-off and synergy relationship of ecosystem services is an important topic in the current assessment.The value of each service provided by the ecosystem is substantially affected by human activities,and conversely,its changes will also affect the relevant human decisions.Due to varying trade-offs among ecosystem services and synergies between them that can either increase or decrease,it is difficult to optimize multiple ecosystem services simultaneously,making it a huge challenge for ecosystem management.This study firstly develops a global Gross Ecosystem Product(GEP)accounting framework.It uses remote sensing data with a spatial resolution of 1 km to estimate the ecosystem services of forests,wetlands,grasslands,deserts,and farmlands in 179 major countries in 2018.The results show that the range of global GEP values is USD 112-197 trillion,with an average value of USD 155 trillion(the constant price),and the ratio of GEP to gross domestic product(GDP)is 1.85.The trade-offs and the synergies among different ecosystem services in each continent and income group have been further explored.We found a correspondence between the income levels and the synergy among ecosystem services within each nation.Among specific ecosystem services,there are strong synergies between oxygen release,climate regulation,and carbon sequestration services.A trade-off relationship has been observed between flood regulation and other services,such as water conservation and soil retention services in low-income countries.The results will help clarify the roles and the feedback mechanisms between different stakeholders and provide a scientific basis for optimizing ecosystem management and implementing ecological compensation schemes to enhance human well-being.
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    Enhancing volatile fatty acids production from waste activated sludge:The role of pretreatment by N,N-bis(carboxymethyl)-L-glutamate(GLDA)

    Chang LiuLin LiLinji XuTanglong Zhang...
    149-157页
    查看更多>>摘要：N,N-bis(carboxymethyl)-L-glutamate(GLDA)is an eco-friendly chelating agent that effectively extracts multivalent metal ions from waste activated sludge(WAS)flocs,which could potentially alter their structure.However,the effect of GLDA on the production of volatile fatty acids(VFAs)from WAS is not well known.Here,we demonstrate that pretreatment with GLDA at a concentration of 200 mmol per kg VSS results in a significant increase of 142％in extractable extracellular polymeric substances and en-hances the total VFAs yield by 64％compared to untreated samples.We reveal GLDA's capability to mobilize organic-binding multivalent metal ions within sludge flocs.Specifically,post-pretreatment analyses showed the release of 69.1 mg L-1 of Ca and 109.8 mg L-1 of Fe ions from the flocs,leading to a more relaxed floc structure and a reduced apparent activation energy(10.6 versus 20 kJ mol-1)for WAS solubilization.Molecular dynamic simulations further demonstrate GLDA's preferential binding to Fe3+and Ca2+over Mg2+.Our study suggests that GLDA pretreatment causes minimal disruption to reactor stability,thereby indicating the stability of microbial community composition.GLDA has emerged as a viable pretreatment agent for enhancing volatile fatty acids production from waste activated sludge.
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    Crop residue burning in China(2019-2021):Spatiotemporal patterns,environmental impact,and emission dynamics

    Qiancheng LvZeyu YangZiyue ChenManchun Li...
    158-167页
    查看更多>>摘要：Crop residue burning(CRB)is a major contributor to air pollution in China.Current fire detection methods,however,are limited by either temporal resolution or accuracy,hindering the analysis of CRB's diurnal characteristics.Here we explore the diurnal spatiotemporal patterns and environmental impacts of CRB in China from 2019 to 2021 using the recently released NSMC-Himawari-8 hourly fire product.Our analysis identifies a decreasing directionality in CRB distribution in the Northeast and a notable southward shift of the CRB center,especially in winter,averaging an annual southward movement of 7.5°.Additionally,we observe a pronounced skewed distribution in daily CRB,predominantly between 17:00 and 20:00.Notably,nighttime CRB in China for the years 2019,2020,and 2021 accounted for 51.9％,48.5％,and 38.0％respectively,underscoring its significant environmental impact.The study further quantifies the hourly emissions from CRB in China over this period,with total emissions of CO,PM10,and PM2.5 amounting to 12,236,2,530,and 2,258 Gg,respectively.Our findings also reveal variable lag effects of CRB on regional air quality and pollutants across different seasons,with the strongest impacts in spring and more immediate effects in late autumn.This research provides valuable insights for the regulation and control of diurnal CRB before and after large-scale agricultural activities in China,as well as the associated haze and other pollution weather conditions it causes.
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    Technical alternatives for coke oven gas utilization in China:A comparative analysis of environment-economic-strategic perspectives

    Zichen DiFeixia LeiJiankai JingHao Peng...
    168-177页
    查看更多>>摘要：China is the largest coke producer and consumer.There is a pressing need to address the high emissions of air pollutants and carbon dioxide associated with traditional coking production.As the nation pursues a transition towards carbon neutrality,expanding supply chains for coking plants to produce hydrogen,methanol,and other green alternatives has garnered significant attention.However,the relative ad-vantages of these strategies have remained uncertain.In this study,we integrate a life cycle assessment-economic analysis-scenario analysis model to evaluate various coke oven gas(COG)utilization routes(COGtM:COG-to-methanol,COGtLNG:COG-to-liquefied natural gas,COGtSA:COG-to-synthetic ammonia,and COGtH:COG-to-hydrogen).The results indicate that COGtSA emerges as the preferred option for balancing environmental and economic benefits.Meanwhile,COGtM demonstrates economic viability but is associated with higher environmental impacts.Despite being recognized as a significant strategic direction under carbon neutrality initiatives,COGtH faces economic feasibility and risk resil-ience limitations.COGtLNG encounters both financial and environmental challenges,necessitating strategic development from an energy security perspective.The projected coking capacity is anticipated to experience a slight increase in the mid-term yet a significant decline in the long term,influenced by steel production capacity.In potential future markets,COGtM is estimated to potentially capture a maximum market share of 16-34％in the methanol market.Furthermore,against the backdrop of continuously expanding potential demand for hydrogen,COGtH holds advantages as a transitional so-lution,but in the long run,it can only meet a small portion of the market.COGtSA can meet 7-14％of market demand and emerges as the most viable pathway from the viewpoint of balancing environmental and economic aspects and covering future markets.
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    Extracellular polymeric substances as paper coating biomaterials derived from anaerobic granular sludge

    Cuijie FengLorenzo BonettiHui LuZhongbo Zhou...
    178-186页
    查看更多>>摘要：Recovering extracellular polymeric substances(EPS)from waste granular sludge offers a cost-effective and sustainable approach for transforming wastewater resources into industrially valuable products.Yet,the application potential of these EPS in real-world scenarios,particularly in paper manufacturing,remains underexplored.Here we show the feasibility of EPS-based biomaterials,derived from anaerobic granular sludges,as novel coating agents in paper production.We systematically characterised the rheological properties of various EPS-based suspensions.When applied as surface sizing agents,these EPS-based biomaterials formed a distinct,ultra-thin layer on paper,as evidenced by scanning electron microscopy.A comprehensive evaluation of water and oil penetration,along with barrier properties,revealed that EPS-enhanced coatings markedly diminished water absorption while significantly bolstering oil and grease resistance.Optimal performance was observed in EPS variants with elevated protein and hydrophobic contents,correlating with their superior rheological characteristics.The enhanced water-barrier and grease resistance of EPS-coated paper can be attributed to its non-porous,fine surface structure and the functional groups in EPS,particularly the high protein content and hy-drophobic humic-like substances.This research marks the first demonstration of utilizing EPS from anaerobic granular sludge as paper-coating biomaterials,bridging a critical knowledge gap in the sus-tainable use of biopolymers in industrial applications.
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    Groundwater chromate removal by autotrophic sulfur disproportionation

    Yan-Ying QiuJuntao XiaJiahua GuoXianzhe Gong...
    187-196页
    查看更多>>摘要：Chromate[Cr(Ⅵ)]contamination in groundwater is a global environmental challenge.Traditional elemental sulfur-based biotechnologies for Cr(Ⅵ)removal depend heavily on the synthesis of dissolved organic carbon to fuel heterotrophic Cr(Ⅵ)reduction,a bottleneck in the remediation process.Here we show an alternative approach by leveraging sulfur-disproportionating bacteria(SDB)inherent to groundwater ecosystems,offering a novel and efficient Cr(Ⅵ)removal strategy.We implemented SDB within a sulfur-packed bed reactor for treating Cr(Ⅵ)-contaminated groundwater,achieving a notable removal rate of 6.19 mg L-1 h-1 under oligotrophic conditions.We identified the chemical reduction of Cr(Ⅵ)via sulfide,produced through sulfur disproportionation,as a key mechanism,alongside microbial Cr(Ⅵ)reduction within the sulfur-based biosystem.Genome-centric metagenomic analysis revealed a symbiotic relationship among SDB,sulfur-oxidizing,and chromate-reducing bacteria within the reactor,suggesting that Cr(Ⅵ)detoxification by these microbial communities enhances the sulfur-disproportionation process.This research highlights the significance of sulfur disproportionation in the cryptic sulfur cycle in Cr(Ⅵ)-contaminated groundwater and proposes its practical application in groundwater remediation efforts.
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    Water temperature governs organophosphate ester dynamics in the aquatic food chain of Poyang Lake

    Zhenfei YanChenglian FengYiping XuJindong Wang...
    197-207页
    查看更多>>摘要：Organophosphate esters(OPEs)are increasingly recognized as pervasive environmental contaminants,primarily from their extensive application in flame retardants and plasticizers.Despite their widespread presence,the intricacies of OPE bioaccumulation within aquatic ecosystems remain poorly understood,particularly the environmental determinants influencing their distribution and the bioaccumulation dynamics across aquatic food chains.Here we show that water temperature plays a crucial role in modulating the dispersion of OPE in the aquatic environment of Poyang Lake.We quantified OPE con-centrations across various matrices,uncovering levels ranging from 0.198 to 912.622 ng L-1 in water,0.013-493.36 ng per g dry weight(dw)in sediment,0.026-41.92 ng per g wet weight(ww)in plankton,0.13-2100.72 ng per g dw in benthic invertebrates,and 0.31-3956.49 ng per g dw in wild fish,high-lighting a pronounced bioaccumulation gradient.Notably,the intestines emerged as the principal site for OPE absorption,displaying the highest concentrations among the seven tissues examined.Among the various OPEs,tris(chloroethyl)phosphate was distinguished by its significant bioaccumulation potential within the aquatic food web,suggesting a need for heightened scrutiny.The propensity for OPE accu-mulation was markedly higher in benthic invertebrates than wild fish,indicating a differential vulner-ability within aquatic biota.This study lays a foundational basis for the risk assessment of OPEs as emerging contaminants and underscores the imperative to prioritize the examination of bio-accumulation effects,particularly in benthic invertebrates,to inform future environmental safeguarding strategies.
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    Gut pathobiome mediates behavioral and developmental disorders in biotoxin-exposed amphibians

    Qianqian PanTianxing LvHaorong XuHongda Fang...
    208-218页
    查看更多>>摘要：Emerging evidence suggests a link between alterations in the gut microbiome and adverse health out-comes in the hosts exposed to environmental pollutants.Yet,the causal relationships and underlying mechanisms remain largely undefined.Here we show that exposure to biotoxins can affect gut patho-biome assembly in amphibians,which in turn triggers the toxicity of exogenous pollutants.We used Xenopus laevis as a model in this study.Tadpoles exposed to tropolone demonstrated notable develop-mental impairments and increased locomotor activity,with a reduction in total length by 4.37％-22.48％and an increase in swimming speed by 49.96％-84.83％.Fusobacterium and Cetobacterium are predom-inant taxa in the gut pathobiome of tropolone-exposed tadpoles.The tropolone-induced developmental and behavioral disorders in the host were mediated by assembly of the gut pathobiome,leading to transcriptome reprogramming.This study not only advances our understanding of the intricate in-teractions between environmental pollutants,the gut pathobiome,and host health but also emphasizes the potential of the gut pathobiome in mediating the toxicological effects of environmental contaminants.
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    Cobalt single-atom catalyst tailored ceramic membrane for selective removal of emerging organic contaminants

    Jiaxuan YangJing ZhaoHesong WangYatao Liu...
    219-229页
    查看更多>>摘要：Water reuse is an effective way to solve the issues of current wastewater increments and water resource scarcity.Ultrafiltration,a promising method for water reuse,has the characteristics of low energy con-sumption,easy operation,and high adaptability to coupling with other water treatment processes.However,emerging organic contaminants(EOCs)in municipal wastewater cannot be effectively inter-cepted by ultrafiltration,which poses significant challenges to the effluent quality and sustainability of ultrafiltration process.Here,we develop a cobalt single-atom catalyst-tailored ceramic membrane(Co1-NCNT-CM)in conjunction with an activated peroxymonosulfate(PMS)system,achieving excellent EOCs degradation and anti-fouling performance.An interfacial reaction mechanism effectively mitigates membrane fouling through a repulsive interaction with natural organic matter.The generation of singlet oxygen at the Co-N3-C active sites through a catalytic pathway(PMS→PMS*→OH*→O*→OO*→1O2)exhibits selective oxidation of phenols and sulfonamides,achieving＞90％removal rates.Our findings elucidate a multi-layered functional architecture within the Co1-NCNT-CM/PMS system,responsible for its superior performance in organic decontamination and membrane maintenance during secondary effluent treatment.It highlights the power of integrating Co1-NCNT-CM/PMS systems in advanced wastewater treatment frameworks,specifically for targeted EOCs removal,heralding a new direction for sustainable water management.
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