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Cobalt single-atom catalyst tailored ceramic membrane for selective removal of emerging organic contaminants 用于选择性去除新兴有机污染物的钴单原子催化剂定制陶瓷膜
IF 12.6 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-03-21 DOI: 10.1016/j.ese.2024.100416
Jiaxuan Yang , Jing Zhao , Hesong Wang , Yatao Liu , Junwen Ding , Tianyi Wang , Jinlong Wang , Han Zhang , Langming Bai , Heng Liang

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 consumption, easy operation, and high adaptability to coupling with other water treatment processes. However, emerging organic contaminants (EOCs) in municipal wastewater cannot be effectively intercepted 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.

中水回用是解决当前废水增量和水资源短缺问题的有效途径。超滤作为一种前景广阔的中水回用方法,具有能耗低、操作简便、与其他水处理工艺耦合适应性强等特点。然而,城市污水中的新兴有机污染物(EOCs)无法被超滤有效拦截,这给出水水质和超滤工艺的可持续性带来了巨大挑战。在此,我们开发了一种钴单原子催化剂定制陶瓷膜(Co1-NCNT-CM),并将其与活化过一硫酸盐(PMS)系统相结合,实现了出色的 EOCs 降解和防污性能。界面反应机制通过与天然有机物的排斥作用有效缓解了膜堵塞。通过催化途径(PMS→PMS∗→OH∗→O∗→O∗O∗→1O2)在 Co-N3-C 活性位点生成的单线态氧对酚类和磺酰胺类化合物具有选择性氧化作用,实现了 >90% 的去除率。我们的研究结果阐明了 Co1-NCNT-CM/PMS 系统内的多层功能结构,这也是其在二级污水处理过程中有机净化和膜维护性能优越的原因。这凸显了将 Co1-NCNT-CM/PMS 系统集成到先进的废水处理框架中,特别是用于有针对性地去除 EOCs 的强大功能,预示着可持续水管理的新方向。
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引用次数: 0
In situ single iron atom doping on Bi2WO6 monolayers triggers efficient photo-fenton reaction 在 Bi2WO6 单层上原位掺入单个铁原子引发高效光-芬顿反应
IF 12.6 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-03-20 DOI: 10.1016/j.ese.2024.100414
Wei Liu , Peifang Wang , Juan Chen , Xin Gao , Huinan Che , Xiaozhi Su , Bin Liu , Yanhui Ao

Developing an efficient photocatalytic system for hydrogen peroxide (H2O2) activation in Fenton-like processes holds significant promise for advancing water purification technologies. However, challenges such as high carrier recombination rates, limited active sites, and suboptimal H2O2 activation efficiency impede optimal performance. Here we show that single-iron-atom dispersed Bi2WO6 monolayers (SIAD-BWOM), designed through a facile hydrothermal approach, can offer abundant active sites for H2O2 activation. The SIAD-BWOM catalyst demonstrates superior photo-Fenton degradation capabilities, particularly for the persistent pesticide dinotefuran (DNF), showcasing its potential in addressing recalcitrant organic pollutants. We reveal that the incorporation of iron atoms in place of tungsten within the electron-rich [WO4]2− layers significantly facilitates electron transfer processes and boosts the Fe(II)/Fe(III) cycle efficiency. Complementary experimental investigations and theoretical analyses further elucidate how the atomically dispersed iron induces lattice strain in the Bi2WO6 monolayer, thereby modulating the d-band center of iron to improve H2O2 adsorption and activation. Our research provides a practical framework for developing advanced photo-Fenton catalysts, which can be used to treat emerging and refractory organic pollutants more effectively.

开发一种高效的光催化系统,用于在类似芬顿的过程中活化过氧化氢(H2O2),为推进水净化技术的发展带来了巨大希望。然而,载流子重组率高、活性位点有限以及 H2O2 活化效率不理想等挑战阻碍了该系统实现最佳性能。在这里,我们展示了通过简便的水热法设计的单铁原子分散 Bi2WO6 单层(SIAD-BWOM),它能为 H2O2 活化提供丰富的活性位点。SIAD-BWOM 催化剂具有卓越的光-芬顿降解能力,尤其是对持久性农药二硝基呋喃(DNF)的降解能力,展示了其在处理难降解有机污染物方面的潜力。我们发现,在富电子[WO4]2-层中加入铁原子代替钨,能显著促进电子转移过程,提高铁(II)/铁(III)循环效率。实验研究和理论分析相互补充,进一步阐明了原子分散的铁如何在 Bi2WO6 单层中诱导晶格应变,从而调节铁的 d 带中心,改善 H2O2 的吸附和活化。我们的研究为开发先进的光-芬顿催化剂提供了一个实用框架,这种催化剂可用于更有效地处理新出现的难处理有机污染物。
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引用次数: 0
Enhancing nitrogen removal in constructed wetlands: The role of influent substrate concentrations in integrated vertical-flow systems 提高人工湿地的脱氮能力:综合垂直流系统中进水基质浓度的作用
IF 12.6 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-03-20 DOI: 10.1016/j.ese.2024.100411
Tongtong Liu , Da Li , Yan Tian , Jiajie Zhou , Ye Qiu , Dongyi Li , Guohong Liu , Yujie Feng

Recent advancements in constructed wetlands (CWs) have highlighted the imperative of enhancing nitrogen (N) removal efficiency. However, the variability in influent substrate concentrations presents a challenge in optimizing N removal strategies due to its impact on removal efficiency and mechanisms. Here we show the interplay between influent substrate concentration and N removal processes within integrated vertical-flow constructed wetlands (IVFCWs), using wastewaters enriched with NO3-N and NH4+-N at varying carbon to nitrogen (C/N) ratios (1, 3, and 6). In the NO3-N enriched systems, a positive correlation was observed between the C/N ratio and total nitrogen (TN) removal efficiency, which markedly increased from 13.46 ± 2.23% to 87.00 ± 2.37% as the C/N ratio escalated from 1 to 6. Conversely, in NH4+-N enriched systems, TN removal efficiencies in the A-6 setup (33.69 ± 4.83%) were marginally 1.25 to 1.29 times higher than those in A-3 and A-1 systems, attributed to constraints in dissolved oxygen (DO) levels and alkalinity. Microbial community analysis and metabolic pathway assessment revealed that anaerobic denitrification, microbial N assimilation, and dissimilatory nitrate reduction to ammonium (DNRA) predominated in NO3-N systems with higher C/N ratios (C/N ≥ 3). In contrast, aerobic denitrification and microbial N assimilation were the primary pathways in NH4+-N systems and low C/N NO3-N systems. A mass balance approach indicated denitrification and microbial N assimilation contributed 4.12–47.12% and 8.51–38.96% in NO3-N systems, respectively, and 0.55–17.35% and 7.83–33.55% in NH4+-N systems to TN removal. To enhance N removal, strategies for NO3-N dominated systems should address carbon source limitations and electron competition between denitrification and DNRA processes, while NH4+-N dominated systems require optimization of carbon utilization pathways, and ensuring adequate DO and alkalinity supply.

近年来,人工湿地(CWs)的发展突显了提高氮(N)去除效率的必要性。然而,由于进水基质浓度的变化会对脱氮效率和机制产生影响,因此给脱氮策略的优化带来了挑战。在此,我们利用富含 NO3-N 和 NH4+-N 的废水,以不同的碳氮比(1、3 和 6),展示了一体化垂直流建造湿地(IVFCWs)中进水底物浓度与脱氮过程之间的相互作用。在富含 NO3-N 的系统中,碳氮比与总氮(TN)去除率之间呈正相关,随着碳氮比从 1 升至 6,总氮去除率从 13.46 ± 2.23% 显著升至 87.00 ± 2.37%。相反,在富含 NH4+-N 的系统中,A-6 设置的 TN 去除效率(33.69 ± 4.83%)略高于 A-3 和 A-1 系统的 1.25 至 1.29 倍,这归因于溶解氧(DO)水平和碱度的限制。微生物群落分析和代谢途径评估表明,在 C/N 比(C/N ≥ 3)较高的 NO3-N 系统中,厌氧反硝化、微生物氮同化和硝酸盐还原成铵(DNRA)占主导地位。相反,在 NH4+-N 系统和低 C/N NO3-N 系统中,好氧反硝化和微生物氮同化作用是主要途径。质量平衡法表明,在NO3--N系统中,反硝化作用和微生物氮同化作用对TN去除的贡献率分别为4.12-47.12%和8.51-38.96%;在NH4+-N系统中,反硝化作用和微生物氮同化作用对TN去除的贡献率分别为0.55-17.35%和7.83-33.55%。为了提高N的去除率,NO3--N为主的系统应解决碳源限制以及反硝化和DNRA过程之间的电子竞争问题,而NH4+-N为主的系统则需要优化碳利用途径,并确保充足的溶解氧和碱度供应。
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引用次数: 0
Tap water microbiome shifts in secondary water supply for high-rise buildings 高层建筑二次供水中自来水微生物群的变化
IF 12.6 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-03-16 DOI: 10.1016/j.ese.2024.100413
Manjie Li , Zhaowei Liu , Yongcan Chen

In high-rise buildings, secondary water supply systems (SWSSs) are pivotal yet provide a conducive milieu for microbial proliferation due to intermittent flow, low disinfectant residual, and high specific pipe-surface area, raising concerns about tap water quality deterioration. Despite their ubiquity, a comprehensive understanding of bacterial community dynamics within SWSSs remains elusive. Here we show how intrinsic SWSS variables critically shape the tap water microbiome at distal ends. In an office setting, distinct from residential complexes, the diversity in piping materials instigates a noticeable bacterial community shift, exemplified by a transition from α-Proteobacteria to γ-Proteobacteria dominance, alongside an upsurge in bacterial diversity and microbial propagation potential. Extended water retention within SWSSs invariably escalates microbial regrowth propensities and modulates bacterial consortia, yet secondary disinfection emerges as a robust strategy for preserving water quality integrity. Additionally, the regularity of water usage modulates proximal flow dynamics, thereby influencing tap water's microbial landscape. Insights garnered from this investigation lay the groundwork for devising effective interventions aimed at safeguarding microbiological standards at the consumer's endpoint.

在高层建筑中,二次供水系统(SWSS)起着举足轻重的作用,但由于水流时断时续、消毒剂残留量低、管道表面积大等原因,为微生物的繁殖提供了有利环境,从而引发了对自来水水质恶化的担忧。尽管自来水厂无处不在,但人们对自来水厂内细菌群落动态的全面了解仍很渺茫。在这里,我们展示了自来水厂固有变量如何在远端关键地塑造自来水微生物群落。在办公室环境中,与住宅区不同,管道材料的多样性促使细菌群落发生了明显的变化,例如从α-蛋白杆菌占优势转变为γ-蛋白杆菌占优势,同时细菌多样性和微生物繁殖潜力也急剧上升。在自来水厂中延长水的滞留时间必然会加剧微生物的再生倾向并改变细菌群落,但二次消毒是保持水质完整性的有力策略。此外,用水的规律性会调节近端水流动态,从而影响自来水的微生物景观。从这项调查中获得的启示为设计有效的干预措施奠定了基础,这些干预措施旨在保障消费者终端的微生物标准。
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引用次数: 0
Electrical stress and acid orange 7 synergistically clear the blockage of electron flow in the methanogenesis of low-strength wastewater 电应力和酸性橙 7 协同清除低浓度废水产甲烷过程中电子流的阻塞
IF 12.6 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-03-13 DOI: 10.1016/j.ese.2024.100410
Ze-Chong Guo , Min-Hua Cui , Chun-Xue Yang , Hong-Liang Dai , Tong-Yi Yang , Lin-Zhi Zhai , Yong Chen , Wen-Zong Liu , Ai-Jie Wang

Energy recovery from low-strength wastewater through anaerobic methanogenesis is constrained by limited substrate availability. The development of efficient methanogenic communities is critical but challenging. Here we develop a strategy to acclimate methanogenic communities using conductive carrier (CC), electrical stress (ES), and Acid Orange 7 (AO7) in a modified biofilter. The synergistic integration of CC, ES, and AO7 precipitated a remarkable 72-fold surge in methane production rate compared to the baseline. This increase was attributed to an altered methanogenic community function, independent of the continuous presence of AO7 and ES. AO7 acted as an external electron acceptor, accelerating acetogenesis from fermentation intermediates, restructuring the bacterial community, and enriching electroactive bacteria (EAB). Meanwhile, CC and ES orchestrated the assembly of the archaeal community and promoted electrotrophic methanogens, enhancing acetotrophic methanogenesis electron flow via a mechanism distinct from direct electrochemical interactions. The collective application of CC, ES, and AO7 effectively mitigated electron flow impediments in low-strength wastewater methanogenesis, achieving an additional 34% electron recovery from the substrate. This study proposes a new method of amending anaerobic digestion systems with conductive materials to advance wastewater treatment, sustainability, and energy self-sufficiency.

通过厌氧产甲烷从低浓度废水中回收能量受到基质供应有限的限制。发展高效的产甲烷群落至关重要,但也极具挑战性。在此,我们开发了一种策略,在改良生物滤池中使用导电载体(CC)、电应力(ES)和酸性橙 7(AO7)来调节产甲烷群落。与基线相比,CC、ES 和 AO7 的协同作用使甲烷产生率显著增加了 72 倍。这一增长归因于甲烷生成群落功能的改变,与 AO7 和 ES 的持续存在无关。AO7 作为外部电子受体,加速了发酵中间产物的乙酰生成,重组了细菌群落,并丰富了电活性细菌(EAB)。与此同时,CC 和 ES 协调了古菌群落的组装,促进了电营养甲烷菌的生长,通过一种不同于直接电化学相互作用的机制增强了乙酰甲烷生成的电子流。CC、ES和AO7的联合应用有效地缓解了低浓度废水甲烷化过程中的电子流障碍,使底物的电子回收率提高了34%。这项研究提出了一种用导电材料改进厌氧消化系统的新方法,以促进废水处理、可持续发展和能源自给自足。
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引用次数: 0
Spatiotemporal drivers of urban water pollution: Assessment of 102 cities across the Yangtze River Basin 城市水污染的时空驱动因素:对长江流域 102 个城市的评估
IF 12.6 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-03-11 DOI: 10.1016/j.ese.2024.100412
Yi-Lin Zhao , Han-Jun Sun , Xiao-Dan Wang , Jie Ding , Mei-Yun Lu , Ji-Wei Pang , Da-Peng Zhou , Ming Liang , Nan-Qi Ren , Shan-Shan Yang

Effective management of large basins necessitates pinpointing the spatial and temporal drivers of primary index exceedances and urban risk factors, offering crucial insights for basin administrators. Yet, comprehensive examinations of multiple pollutants within the Yangtze River Basin remain scarce. Here we introduce a pollution inventory for urban clusters surrounding the Yangtze River Basin, analyzing water quality data from 102 cities during 2018–2019. We assessed the exceedance rates for six pivotal indicators: dissolved oxygen (DO), ammonia nitrogen (NH3–N), chemical oxygen demand (COD), biochemical oxygen demand (BOD), total phosphorus (TP), and the permanganate index (CODMn) for each city. Employing random forest regression and SHapley Additive exPlanations (SHAP) analyses, we identified the spatiotemporal factors influencing these key indicators. Our results highlight agricultural activities as the primary contributors to the exceedance of all six indicators, thus pinpointing them as the leading pollution source in the basin. Additionally, forest coverage, livestock farming, chemical and pharmaceutical sectors, along with meteorological elements like precipitation and temperature, significantly impacted various indicators' exceedances. Furthermore, we delineate five core urban risk components through principal component analysis, which are (1) anthropogenic and industrial activities, (2) agricultural practices and forest extent, (3) climatic variables, (4) livestock rearing, and (5) principal polluting sectors. The cities were subsequently evaluated and categorized based on these risk components, incorporating policy interventions and administrative performance within each region. The comprehensive analysis advocates for a customized strategy in addressing the discerned risk factors, especially for cities presenting elevated risk levels.

要对大型流域进行有效管理,就必须准确定位首要指标超标的时空驱动因素和城市风险因素,从而为流域管理者提供至关重要的见解。然而,对长江流域内多种污染物的全面研究仍然很少。在此,我们介绍了长江流域周边城市群的污染清单,分析了 2018-2019 年期间 102 个城市的水质数据。我们评估了各城市溶解氧(DO)、氨氮(NH3-N)、化学需氧量(COD)、生化需氧量(BOD)、总磷(TP)和高锰酸盐指数(CODMn)六项关键指标的超标率。通过随机森林回归和 SHapley Additive exPlanations(SHAP)分析,我们确定了影响这些关键指标的时空因素。结果表明,农业活动是导致所有六项指标超标的主要因素,因此农业活动是该流域的主要污染源。此外,森林覆盖率、畜牧业、化工和制药行业以及降水和温度等气象要素也对各项指标的超标产生了重大影响。此外,我们还通过主成分分析划分出五个核心城市风险成分,分别是:(1)人为活动和工业活动;(2)农业生产方式和森林覆盖率;(3)气候变量;(4)畜牧业;(5)主要污染行业。随后,根据这些风险因素对城市进行了评估和分类,并将政策干预措施和行政绩效纳入每个区域。综合分析主张采用定制战略来应对已发现的风险因素,特别是对于风险水平较高的城市。
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引用次数: 0
Microeukaryotic plankton community dynamics under ecological water replenishment: Insights from eDNA metabarcoding 生态补水下的微真核浮游生物群落动力学:eDNA 代谢编码的启示
IF 12.6 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-03-07 DOI: 10.1016/j.ese.2024.100409
Shuping Wang , Songsong Gu , Yaqun Zhang , Ye Deng , Wenhui Qiu , Qianhang Sun , Tianxu Zhang , Pengyuan Wang , Zhenguang Yan

Ecological water replenishment (EWR) is an important strategy for river restoration globally, but timely evaluation of its ecological effects at a large spatiotemporal scale to further adjust the EWR schemes is of great challenge. Here, we examine the impact of EWR on microeukaryotic plankton communities in three distinct river ecosystems through environmental DNA (eDNA) metabarcoding. The three ecosystems include a long-term cut-off river, a short-term connected river after EWR, and long-term connected rivers. We analyzed community stability by investigating species composition, stochastic and deterministic dynamics interplay, and ecological network robustness. We found that EWR markedly reduced the diversity and complexity of microeukaryotic plankton, altered their community dynamics, and lessened the variation within the community. Moreover, EWR disrupted the deterministic patterns of community organization, favoring dispersal constraints, and aligning with trends observed in naturally connected rivers. The shift from an isolated to a temporarily connected river appeared to transition community structuring mechanisms from deterministic to stochastic dominance, whereas, in permanently connected rivers, both forces concurrently influenced community assembly. The ecological network in temporarily connected rivers post-EWR demonstrated significantly greater stability and intricacy compared to other river systems. This shift markedly bolstered the resilience of the ecological network. The eDNA metabarcoding insights offer a novel understanding of ecosystem resilience under EWR interventions, which could be critical in assessing the effects of river restoration projects throughout their life cycle.

生态补水(EWR)是全球河流修复的一项重要战略,但在大时空尺度上及时评估其生态效应以进一步调整生态补水方案是一项巨大的挑战。在这里,我们通过环境 DNA(eDNA)元条码研究了 EWR 对三个不同河流生态系统中微真核浮游生物群落的影响。这三个生态系统包括长期断流的河流、EWR 后短期连通的河流以及长期连通的河流。我们通过研究物种组成、随机和确定性动力学相互作用以及生态网络稳健性来分析群落稳定性。我们发现,EWR 明显降低了微真核细胞浮游生物的多样性和复杂性,改变了它们的群落动力学,减少了群落内部的变异。此外,EWR 破坏了群落组织的确定性模式,有利于分散限制,与在自然连接的河流中观察到的趋势一致。从孤立的河流到暂时连通的河流,群落结构机制似乎从确定性主导转变为随机性主导,而在永久连通的河流中,两种力量同时影响着群落的组合。与其他河流系统相比,EWR 后暂时连通的河流的生态网络显示出更高的稳定性和复杂性。这种转变明显增强了生态网络的恢复能力。eDNA 代谢编码的研究成果为人们提供了一种对 EWR 干预下生态系统恢复能力的新认识,这对于评估河流修复项目在其整个生命周期内的效果至关重要。
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引用次数: 0
Modifying temperature-related cardiovascular mortality through green-blue space exposure 通过绿蓝空间暴露改变与温度相关的心血管死亡率
IF 12.6 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-03-07 DOI: 10.1016/j.ese.2024.100408
Kejia Hu , Shiyi Wang , Fangrong Fei , Jinglu Song , Feng Chen , Qi Zhao , Yujie Shen , Jingqiao Fu , Yunquan Zhang , Jian Cheng , Jieming Zhong , Xuchao Yang , Jiayu Wu

Green-blue spaces (GBS) are pivotal in mitigating thermal discomfort. However, their management lacks guidelines rooted in epidemiological evidence for specific planning and design. Here we show how various GBS types modify the link between non-optimal temperatures and cardiovascular mortality across different thermal extremes. We merged fine-scale population density and GBS data to create novel GBS exposure index. A case time series approach was employed to analyse temperature-cardiovascular mortality association and the effect modifications of type-specific GBSs across 1085 subdistricts in south-eastern China. Our findings indicate that both green and blue spaces may significantly reduce high-temperature-related cardiovascular mortality risks (e.g., for low (5%) vs. high (95%) level of overall green spaces at 99th vs. minimum mortality temperature (MMT), Ratio of relative risk (RRR) = 1.14 (95% CI: 1.07, 1.21); for overall blue spaces, RRR = 1.20 (95% CI: 1.12, 1.29)), while specific blue space types offer protection against cold temperatures (e.g., for the rivers at 1st vs MMT, RRR = 1.17 (95% CI: 1.07, 1.28)). Notably, forests, parks, nature reserves, street greenery, and lakes are linked with lower heat-related cardiovascular mortality, whereas rivers and coasts mitigate cold-related cardiovascular mortality. Blue spaces provide greater benefits than green spaces. The severity of temperature extremes further amplifies GBS's protective effects. This study enhances our understanding of how type-specific GBS influences health risks associated with non-optimal temperatures, offering valuable insights for integrating GBS into climate adaptation strategies for maximal health benefits.

绿蓝空间(GBS)在缓解热不适方面发挥着关键作用。然而,在具体的规划和设计中,它们的管理缺乏基于流行病学证据的指导方针。在这里,我们展示了各种类型的 GBS 如何在不同的极端热量条件下改变非最佳温度与心血管死亡率之间的联系。我们合并了精细尺度的人口密度和 GBS 数据,创建了新的 GBS 暴露指数。我们采用病例时间序列法分析了中国东南部 1085 个分区的气温与心血管疾病死亡率之间的关系,以及特定类型的 GBS 对气温的影响。我们的研究结果表明,绿地和蓝地都能显著降低与高温相关的心血管死亡风险(例如,低温(5%)与高温(5%)相比,绿地和蓝地都能显著降低心血管死亡风险)、99度与最低死亡温度(MMT)的低(5%)与高(95%)水平的整体绿地,相对风险比(RRR)=1.14(95% CI:1.07,1.21);整体蓝地,RRR=1.20(95% CI:1.12,1.29)),而特定类型的蓝地则可抵御低温(例如,1度与最低死亡温度(MMT)的河流,RRR=1.17(95% CI:1.07,1.28))。值得注意的是,森林、公园、自然保护区、街道绿化和湖泊与降低与高温相关的心血管死亡率有关,而河流和海岸则可降低与低温相关的心血管死亡率。蓝色空间比绿色空间带来的益处更大。极端气温的严重程度进一步扩大了全球生物圈保护效应。这项研究加深了我们对特定类型的全球生物圈保护如何影响与非最佳温度相关的健康风险的理解,为将全球生物圈保护纳入气候适应战略以获得最大健康效益提供了宝贵的见解。
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引用次数: 0
Harnessing photosynthetic microorganisms for enhanced bioremediation of microplastics: A comprehensive review 利用光合微生物加强微塑料的生物修复:综述
IF 12.6 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-03-05 DOI: 10.1016/j.ese.2024.100407
Giovanni Davide Barone , Andrés Rodríguez-Seijo , Mattia Parati , Brian Johnston , Elif Erdem , Tomislav Cernava , Zhi Zhu , Xufeng Liu , Ilka M. Axmann , Peter Lindblad , Iza Radecka

Mismanaged plastics, upon entering the environment, undergo degradation through physicochemical and/or biological processes. This process often results in the formation of microplastics (MPs), the most prevalent form of plastic debris (<1 mm). MPs pose severe threats to aquatic and terrestrial ecosystems, necessitating innovative strategies for effective remediation. Some photosynthetic microorganisms can degrade MPs but there lacks a comprehensive review. Here we examine the specific role of photoautotrophic microorganisms in water and soil environments for the biodegradation of plastics, focussing on their unique ability to grow persistently on diverse polymers under sunlight. Notably, these cells utilise light and CO2 to produce valuable compounds such as carbohydrates, lipids, and proteins, showcasing their multifaceted environmental benefits. We address key scientific questions surrounding the utilisation of photosynthetic microorganisms for MPs and nanoplastics (NPs) bioremediation, discussing potential engineering strategies for enhanced efficacy. Our review highlights the significance of alternative biomaterials and the exploration of strains expressing enzymes, such as polyethylene terephthalate (PET) hydrolases, in conjunction with microalgal and/or cyanobacterial metabolisms. Furthermore, we delve into the promising potential of photo-biocatalytic approaches, emphasising the coupling of plastic debris degradation with sunlight exposure. The integration of microalgal-bacterial consortia is explored for biotechnological applications against MPs and NPs pollution, showcasing the synergistic effects in wastewater treatment through the absorption of nitrogen, heavy metals, phosphorous, and carbon. In conclusion, this review provides a comprehensive overview of the current state of research on the use of photoautotrophic cells for plastic bioremediation. It underscores the need for continued investigation into the engineering of these microorganisms and the development of innovative approaches to tackle the global issue of plastic pollution in aquatic and terrestrial ecosystems.

管理不当的塑料进入环境后,会通过物理化学和/或生物过程发生降解。这一过程通常会形成微塑料(MPs),即最常见的塑料碎片(1 毫米)。微塑料对水生和陆地生态系统构成严重威胁,因此必须采取创新策略进行有效补救。一些光合微生物可以降解 MPs,但缺乏全面的综述。在这里,我们研究了光自养微生物在水和土壤环境中对塑料生物降解的特殊作用,重点关注它们在阳光下在不同聚合物上持续生长的独特能力。值得注意的是,这些细胞利用光和二氧化碳生产碳水化合物、脂类和蛋白质等有价值的化合物,展示了其多方面的环境效益。我们探讨了利用光合微生物进行 MPs 和纳米塑料 (NPs) 生物修复的关键科学问题,并讨论了提高功效的潜在工程策略。我们的综述强调了替代生物材料的重要性,以及对表达酶(如聚对苯二甲酸乙二醇酯(PET)水解酶)的菌株与微藻和/或蓝藻代谢物结合的探索。此外,我们还深入研究了光生物催化方法的巨大潜力,强调了塑料碎片降解与阳光照射的结合。我们还探讨了微藻-细菌联合体在生物技术方面的应用,以应对 MPs 和 NPs 污染,通过吸收氮、重金属、磷和碳,展示了在废水处理方面的协同效应。总之,本综述全面概述了利用光自养细胞进行塑料生物修复的研究现状。它强调了继续研究这些微生物工程学和开发创新方法以解决水生和陆地生态系统中塑料污染这一全球性问题的必要性。
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引用次数: 0
Glycine betaine modulates extracellular polymeric substances to enhance microbial salinity tolerance 甘氨酸甜菜碱调节细胞外聚合物质,提高微生物的耐盐性
IF 12.6 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Pub Date : 2024-03-01 DOI: 10.1016/j.ese.2024.100406
Yan Xia , Xinbai Jiang , Shuaishuai Guo , Yuxuan Wang , Yang Mu , Jinyou Shen

High salinity inhibits microbial activity in the bioremediation of saline wastewater. To alleviate osmotic stress, glycine betaine (GB), an osmoprotectant, is added to enhance the secretion of extracellular polymeric substances (EPS). These EPS are pivotal in withstanding environmental stressors, yet the intricate interplay between GB supplementation and microbial responses through EPS modifications—encompassing composition, molecular architecture, and electrochemical features—remains elusive in hypersaline conditions. Here we show microbial strategies for salinity endurance by investigating the impact of GB on the dynamic alterations of EPS properties. Our findings reveal that GB supplementation at 3.5% salinity elevates the total EPS (T-EPS) content from 12.50 ± 0.05 to 24.58 ± 0.96 mg per g dry cell weight. The observed shift in zeta potential from −28.95 to −6.25 mV at 0% and 3.5% salinity, respectively, with GB treatment, indicates a reduction in electrostatic repulsion and compaction. Notably, the EPS protein secondary structure transition from β-sheet to α-helix, with GB addition, signifies a more compact protein configuration, less susceptible to salinity fluctuations. Electrochemical analyses, including cyclic voltammetry (CV) and differential pulse voltammetry (DPV), reveal GB's role in promoting the release of exogenous electron shuttles, such as flavins and c-type cytochromes (c-Cyts). The enhancement in DPV peak areas (QDPV) with GB addition implies an increase in available extracellular electron transfer sites. This investigation advances our comprehension of microbial adaptation mechanisms to salinity through EPS modifications facilitated by GB in saline habitats.

高盐度抑制了含盐废水生物修复中的微生物活性。为了减轻渗透压,需要添加渗透保护剂甘氨酸甜菜碱(GB),以增强细胞外高分子物质(EPS)的分泌。这些 EPS 对抵御环境压力至关重要,但在高盐度条件下,GB 的补充与微生物通过 EPS 的改变(包括成分、分子结构和电化学特征)做出的反应之间错综复杂的相互作用仍然难以捉摸。在这里,我们通过研究 GB 对 EPS 特性动态变化的影响,展示了微生物耐盐策略。我们的研究结果表明,在 3.5% 的盐度条件下补充 GB 可使每克干细胞重量的总 EPS(T-EPS)含量从 12.50 ± 0.05 毫克增至 24.58 ± 0.96 毫克。在 GB 处理下,观察到 zeta 电位在 0% 和 3.5% 盐度下分别从 -28.95 mV 变为 -6.25 mV,这表明静电排斥和压实作用减弱。值得注意的是,添加 GB 后,EPS 蛋白二级结构从 β 片状转变为 α 螺旋状,这表明蛋白质结构更加紧凑,不易受盐度波动的影响。电化学分析,包括循环伏安法(CV)和差分脉冲伏安法(DPV),揭示了 GB 在促进黄素和 c 型细胞色素(c-Cyts)等外源电子穿梭器释放方面的作用。加入 GB 后,DPV 峰面积(QDPV)的增加意味着可用的细胞外电子传递位点的增加。这项研究推动了我们对微生物适应盐度机制的理解,即在盐碱环境中通过 GB 促进 EPS 的改变。
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引用次数: 0
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Environmental Science and Ecotechnology
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