Journal of environmental sciences最新文献_第6页

Ethylene thiourea exposure induces neurobehavioral toxicity in zebrafish by disrupting axon growth and neuromuscular junctions 乙烯硫脲暴露通过破坏轴突生长和神经肌肉接头诱导斑马鱼神经行为毒性

IF 6.9

Journal of environmental sciences Pub Date : 2024-03-01 Epub Date: 2022-11-29 DOI: 10.1016/j.jes.2022.11.012

Jingming Wang , Zhiquan Yu , Yongfeng Wang, Yuanyao Chen, Lin Xiao, Yanjun Zong, Qiyuan Feng, Lianqi Peng, Huiping Zhang, Chunyan Liu

{"title":"Ethylene thiourea exposure induces neurobehavioral toxicity in zebrafish by disrupting axon growth and neuromuscular junctions","authors":"Jingming Wang , Zhiquan Yu , Yongfeng Wang, Yuanyao Chen, Lin Xiao, Yanjun Zong, Qiyuan Feng, Lianqi Peng, Huiping Zhang, Chunyan Liu","doi":"10.1016/j.jes.2022.11.012","DOIUrl":"https://doi.org/10.1016/j.jes.2022.11.012","url":null,"abstract":"<div>Ethylene thiourea (ETU) converted from ethylene bisdithiocarbamate (EBDC) fungicides has aroused great concern because of its prevalence and harmful effects. Although ETU-induced neurotoxicity has been reported, the potential mechanisms remain unclear. This study provided insights into its neurotoxic effects at environmentally relevant concentrations in zebrafish. Our findings showed that embryonic exposure to ETU decreased the hatch rate and delayed somite development. Furthermore, ETU treatment significantly reduced the dark velocity in the locomotion assay. The upregulated tendency of the mitogen-activated protein kinases (MAPK) pathway (mknk1, atf4, mapkapk3) screened by transcriptome analysis implied motor neuron degeneration, which was validated by subsequent morphological observation, as axon length and branches were truncated in the 62.5 µg/L ETU group. However, although the rescue experiment with a p38 MAPK inhibitor (SB203580) successfully ameliorated axon degeneration, it failed to reverse the locomotion behaviors. Further exploration of transcriptome data revealed the varied expression of presynaptic scaffold protein-related genes (pcloa, pclob, bsna), whose downregulation might impair the neuromuscular junction (NMJ). Therefore, we reasonably suspected that ETU-induced neurobehavioral deficits might result from the combined effects of the MAPK pathway and presynaptic proteins. Considering this, we highlighted the necessity to take precautions and early interventions for susceptible ETU-exposed populations.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"137 ","pages":"Pages 108-119"},"PeriodicalIF":6.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49764191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fast spreading of surface ozone in both temporal and spatial scale in Pearl River Delta 珠江三角洲地表臭氧在时空尺度上的快速扩散

IF 6.9

Journal of environmental sciences Pub Date : 2024-03-01 Epub Date: 2023-02-24 DOI: 10.1016/j.jes.2023.02.025

Tianhui Cao , Haichao Wang , Lei Li , Xiao Lu , Yiming Liu , Shaojia Fan

{"title":"Fast spreading of surface ozone in both temporal and spatial scale in Pearl River Delta","authors":"Tianhui Cao , Haichao Wang , Lei Li , Xiao Lu , Yiming Liu , Shaojia Fan","doi":"10.1016/j.jes.2023.02.025","DOIUrl":"https://doi.org/10.1016/j.jes.2023.02.025","url":null,"abstract":"<div>Surface ozone (O3) is a major air pollutant and draw increasing attention in the Pearl River Delta (PRD), China. Here, we characterize the spatial-temporal variability of ozone based on a dataset obtained from 57 national monitoring sites during 2013-2019. Our results show that: (1) the seasonal difference of ozone distribution in the inland and coastal areas was significant, which was largely affected by the wind pattern reversals related to the East Asian monsoon, and local ozone production and destruction; (2) the daily maximum 8hr average (MDA8 O3) showed an overall upward trend by 1.11 ppbv/year. While the trends in the nine cities varied differently by ranging from -0.12 to 2.51 ppbv/year. The hot spots of ozone were spreading to southwestern areas from the central areas since 2016. And ozone is becoming a year-round air pollution problem with the pollution season extending to winter and spring in PRD region. (3) at the central and southwestern PRD cities, the percentage of exceedance days from the continuous type (defined as ≥3 days) was increasing. Furthermore, the ozone concentration of continuous type was much higher than that of scattered exceedance type (<3 days). In addition, although the occurrence of continuous type starts to decline since 2017, the total number of exceedance days during the continuous type is increasing. These results indicate that it is more difficult to eliminate the continuous exceedance than the scatter pollution days and highlight the great challenge in mitigation of O3 pollution in these cities.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"137 ","pages":"Pages 540-552"},"PeriodicalIF":6.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49745124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Physiological, transcriptome and gene functional analysis provide novel sights into cadmium accumulation and tolerance mechanisms in kenaf 生理、转录组和基因功能分析为红麻镉积累和耐镉机制的研究提供了新的视角

IF 6.9

Journal of environmental sciences Pub Date : 2024-03-01 Epub Date: 2023-03-16 DOI: 10.1016/j.jes.2023.03.006

Shan Cao , Meng Wang , Jiao Pan , Dengjie Luo , Samavia Mubeen , Caijin Wang , Jiao Yue , Xia Wu , Qijing Wu , Hui Zhang , Canni Chen , Muzammal Rehman , Sichen Xie , Ru Li , Peng Chen

{"title":"Physiological, transcriptome and gene functional analysis provide novel sights into cadmium accumulation and tolerance mechanisms in kenaf","authors":"Shan Cao , Meng Wang , Jiao Pan , Dengjie Luo , Samavia Mubeen , Caijin Wang , Jiao Yue , Xia Wu , Qijing Wu , Hui Zhang , Canni Chen , Muzammal Rehman , Sichen Xie , Ru Li , Peng Chen","doi":"10.1016/j.jes.2023.03.006","DOIUrl":"https://doi.org/10.1016/j.jes.2023.03.006","url":null,"abstract":"<div>Kenaf is considered to have great potential for remediation of heavy metals in ecosystems. However, studies on molecular mechanisms of root Cd accumulation and tolerance are still inadequate. In this study, two differently tolerant kenaf cultivars were selected as materials and the physiological and transcriptomic effects were evaluated under Cd stress. This study showed that 200 µmol/L CdCl2 treatment triggered the reactive oxygen species (ROS) explosion and membrane lipid peroxidation. Compared with the Cd-sensitive cultivar ‘Z’, the Cd-tolerant cultivar ‘F’ was able to resist oxidative stress in cells by producing higher antioxidant enzyme activities and increasing the contents of ascorbic acid (AsA) and glutathione (GSH). The root cell wall of ‘F’ exhibited higher polysaccharide contents under Cd treatment, providing more Cd-binding sites. There were 3,439 differentially expressed genes (DEGs) that were co-regulated by Cd treatment in two cultivars. Phenylpropanoid biosynthesis and plant hormone signal transduction pathways were significantly enriched by functional annotation analysis. DEGs associated with pectin, cellulose, and hemi-cellulose metabolism were involved in Cd chelation of root cell wall; V-ATPases, ABCC3 and Narmp3 could participated in vacuolar compartmentalization of Cd; PDR1 was responsible for Cd efflux; the organic acid transporters contributed to the absorption of Cd in soil. These genes might have played key roles in kenaf Cd tolerance and Cd accumulation. Moreover, HcZIP2 was identified to be involved in Cd uptake and transport in kenaf. Our findings provide a deeper understanding of the molecular pathways underlying Cd accumulation and detoxification mechanisms in kenaf.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"137 ","pages":"Pages 500-514"},"PeriodicalIF":6.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49745143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Total-factor energy efficiency of ten major global energy-consuming countries 全球十大主要能源消费国的全要素能源效率

IF 6.9

Journal of environmental sciences Pub Date : 2024-03-01 Epub Date: 2023-02-26 DOI: 10.1016/j.jes.2023.02.031

Xuan Wang , Yonglong Lu , Chunci Chen , Xiaojie Yi , Haotian Cui

{"title":"Total-factor energy efficiency of ten major global energy-consuming countries","authors":"Xuan Wang , Yonglong Lu , Chunci Chen , Xiaojie Yi , Haotian Cui","doi":"10.1016/j.jes.2023.02.031","DOIUrl":"10.1016/j.jes.2023.02.031","url":null,"abstract":"<div>Improving energy efficiency is regarded as a key path to tackling global warming and achieving the Sustainable Development Goals (SDGs). In 2020, the energy consumption of the world's ten major energy-consuming countries accounted for 66.8% of the global total. This paper applied data envelopment analysis (DEA) to calculate these ten major energy-consuming countries' total-factor energy efficiency (TFEE) at national and sectoral levels from 2001-2020, and explored the influencing factors of total-factor energy efficiency with the Tobit regression model. The results showed significant difference in the ten countries' energy efficiency. The United States and Germany topped the list for total-factor energy efficiency, while China and India were at the bottom. Meanwhile, the energy efficiency of the industrial subsector has increased significantly over the past two decades, while that of the other subsectors has been relatively flat. The industrial structure upgrading, per capita GDP, energy consumption structure, and foreign direct investment had significant impacts on energy efficiency with national heterogeneity. Energy consumption structure and GDP per capita were determinative factors of energy efficiency.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"137 ","pages":"Pages 41-52"},"PeriodicalIF":6.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9090503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Promoted catalytic performance of Ag-Mn bimetal catalysts synthesized through reduction route 还原法制备的Ag-Mn双金属催化剂的催化性能提高

IF 6.9

Journal of environmental sciences Pub Date : 2024-03-01 Epub Date: 2022-11-08 DOI: 10.1016/j.jes.2022.10.045

Wenkai Hu , Tao Guo , Kaiyao Ma , Xu Li , Wangting Luo , Mingzhi Wu , Hao Guo , Yaxin Zhang , Wenfeng Shangguan

{"title":"Promoted catalytic performance of Ag-Mn bimetal catalysts synthesized through reduction route","authors":"Wenkai Hu , Tao Guo , Kaiyao Ma , Xu Li , Wangting Luo , Mingzhi Wu , Hao Guo , Yaxin Zhang , Wenfeng Shangguan","doi":"10.1016/j.jes.2022.10.045","DOIUrl":"https://doi.org/10.1016/j.jes.2022.10.045","url":null,"abstract":"<div>VOCs can exert great harm to both human and environment, and catalytic oxidation is believed to be an effective technique to eliminate these pollutants. In this paper, Ag-Mn bimetal catalysts with 10 wt.% of silver were synthesized using doping, impregnation, and reduction methods respectively, and then they were applied to the catalytic oxidation of benzene. Through series of characterizations it showed that the loading of silver using reduction method significantly resulted in improved physico-chemical properties of manganese oxides, such as larger surface area and pore volume, higher proportion of surface Mn3+ and Mn4+, stronger reducibility and more active of surface oxygen species, which were all beneficial to its catalytic activity. As a result, the Ag-Mn catalysts synthesized by reduction method showed a lower T90 value (equals to the temperature at which 90% of initial benzene was removed) of 203°C. Besides, both the used and fresh Ag-Mn catalysts synthesized by reduction method showed preferable stability in this research.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"137 ","pages":"Pages 358-369"},"PeriodicalIF":6.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49764208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The risk factors and threshold level of subchronic inhalation exposure of reclaimed water 再生水亚慢性吸入暴露的危险因素及阈值

IF 6.9

Journal of environmental sciences Pub Date : 2024-03-01 Epub Date: 2022-12-30 DOI: 10.1016/j.jes.2022.12.031

Jiayang Kong, Yun Lu, Yunru Ren, Menghao Chen, Gang Liu, Liangliang Shi

{"title":"The risk factors and threshold level of subchronic inhalation exposure of reclaimed water","authors":"Jiayang Kong, Yun Lu, Yunru Ren, Menghao Chen, Gang Liu, Liangliang Shi","doi":"10.1016/j.jes.2022.12.031","DOIUrl":"https://doi.org/10.1016/j.jes.2022.12.031","url":null,"abstract":"<div>Inhalation of reclaimed water is known to cause lung inflammation, and free endotoxins have been shown to be a major risk factor for acute exposure. Subchronic exposure has also been shown to induce inflammatory responses with visible tissue damage. However, subchronic risk factors have yet to be identified, and a threshold for the protection of occupational populations during urban reuse is necessary. In this study, potential risk factors in reclaimed water were examined by subchronic exposure with fractionated reclaimed water, and the health risk threshold was tested with a series of diluted reclaimed water. Accordingly, following a 12-week exposure, macromolecules and microorganisms were found to be two major risk factors in reclaimed water that could cause pulmonary inflammation, including increased proportion of polymorphonuclear leukocytes in bronchoalveolar fluid, formation of inducible bronchus-associated lymphoid tissue, and elevation of Immunoglobulin A levels. Moreover, inflammation persisted after a 4-week recovery period. The calculated threshold of reclaimed water exposure for mice was 31.8 Endotoxin Unit (EU)/(kg·day) under when exposed to 50% additional relative humidity from reclaimed water at 25°C for 2 hr/day. Meanwhile, the subchronic threshold estimate for humans under the same exposure conditions was found to be 12.2 EU/(kg·day), corresponding to endotoxin levels of 61.7 EU/mL in reclaimed water. The threshold level of endotoxin was lower than that in most non-potable reclaimed water. The findings of this study suggest that occupational exposure of reclaimed water can serve as a potential risk to workers.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"137 ","pages":"Pages 639-650"},"PeriodicalIF":6.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49764228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Time-sensitive prediction of NO2 concentration in china using an ensemble machine learning model from multi-source data 基于多源数据的集成机器学习模型的中国NO2浓度时间敏感预测

IF 6.9

Journal of environmental sciences Pub Date : 2024-03-01 Epub Date: 2023-02-26 DOI: 10.1016/j.jes.2023.02.026

Chenliang Tao , Man Jia , Guoqiang Wang , Yuqiang Zhang , Qingzhu Zhang , Xianfeng Wang , Qiao Wang , Wenxing Wang

{"title":"Time-sensitive prediction of NO2 concentration in china using an ensemble machine learning model from multi-source data","authors":"Chenliang Tao , Man Jia , Guoqiang Wang , Yuqiang Zhang , Qingzhu Zhang , Xianfeng Wang , Qiao Wang , Wenxing Wang","doi":"10.1016/j.jes.2023.02.026","DOIUrl":"https://doi.org/10.1016/j.jes.2023.02.026","url":null,"abstract":"<div>Nitrogen dioxide (NO2) poses a critical potential risk to environmental quality and public health. A reliable machine learning (ML) forecasting framework will be useful to provide valuable information to support government decision-making. Based on the data from 1609 air quality monitors across China from 2014-2020, this study designed an ensemble ML model by integrating multiple types of spatial-temporal variables and three sub-models for time-sensitive prediction over a wide range. The ensemble ML model incorporates a residual connection to the gated recurrent unit (GRU) network and adopts the advantage of Transformer, extreme gradient boosting (XGBoost) and GRU with residual connection network, resulting in a 4.1%±1.0% lower root mean square error over XGBoost for the test results. The ensemble model shows great prediction performance, with coefficient of determination of 0.91, 0.86, and 0.77 for 1-hr, 3-hr, and 24-hr averages for the test results, respectively. In particular, this model has achieved excellent performance with low spatial uncertainty in Central, East, and North China, the major site-dense zones. Through the interpretability analysis based on the Shapley value for different temporal resolutions, we found that the contribution of atmospheric chemical processes is more important for hourly predictions compared with the daily scale predictions, while the impact of meteorological conditions would be ever-prominent for the latter. Compared with existing models for different spatiotemporal scales, the present model can be implemented at any air quality monitoring station across China to facilitate achieving rapid and dependable forecast of NO2, which will help developing effective control policies.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"137 ","pages":"Pages 30-40"},"PeriodicalIF":6.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49745167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Fundamentals and application in phytoremediation of an efficient arsenate reducing bacterium Pseudomonas putida ARS1 高效砷酸还原菌恶臭假单胞菌ARS1的植物修复原理及应用

IF 6.9

Journal of environmental sciences Pub Date : 2024-03-01 Epub Date: 2023-02-21 DOI: 10.1016/j.jes.2023.02.020

Ze-Wen Wang , Guang Yang , Jian Chen , Yaoyu Zhou , Avelino Núñez Delgado , Hui-Ling Cui , Gui-Lan Duan , Barry P. Rosen , Yong-Guan Zhu

{"title":"Fundamentals and application in phytoremediation of an efficient arsenate reducing bacterium Pseudomonas putida ARS1","authors":"Ze-Wen Wang , Guang Yang , Jian Chen , Yaoyu Zhou , Avelino Núñez Delgado , Hui-Ling Cui , Gui-Lan Duan , Barry P. Rosen , Yong-Guan Zhu","doi":"10.1016/j.jes.2023.02.020","DOIUrl":"https://doi.org/10.1016/j.jes.2023.02.020","url":null,"abstract":"<div>Arsenic is a ubiquitous environmental pollutant. Microbe-mediated arsenic bio-transformations significantly influence arsenic mobility and toxicity. Arsenic transformations by soil and aquatic organisms have been well documented, while little is known regarding effects due to endophytic bacteria. An endophyte Pseudomonas putida ARS1 was isolated from rice grown in arsenic contaminated soil. P. putida ARS1 shows high tolerance to arsenite (As(III)) and arsenate (As(V)), and exhibits efficient As(V) reduction and As(III) efflux activities. When exposed to 0.6 mg/L As(V), As(V) in the medium was completely converted to As(III) by P. putida ARS1 within 4 hr. Genome sequencing showed that P. putida ARS1 has two chromosomal arsenic resistance gene clusters (arsRCBH) that contribute to efficient As(V) reduction and As(III) efflux, and result in high resistance to arsenicals. Wolffia globosa is a strong arsenic accumulator with high potential for arsenic phytoremediation, which takes up As(III) more efficiently than As(V). Co-culture of P. putida ARS1 and W. globosa enhanced arsenic accumulation in W. globosa by 69%, and resulted in 91% removal of arsenic (at initial concentration of 0.6 mg/L As(V)) from water within 3 days. This study provides a promising strategy for in situ arsenic phytoremediation through the cooperation of plant and endophytic bacterium.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"137 ","pages":"Pages 237-244"},"PeriodicalIF":6.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49745168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Enrichment of anammox biomass during mainstream wastewater treatment driven by achievement of partial denitrification through the addition of bio-carriers 通过添加生物载体实现部分反硝化，在主流废水处理过程中厌氧氨氧化生物质的富集

IF 6.9

Journal of environmental sciences Pub Date : 2024-03-01 Epub Date: 2023-03-11 DOI: 10.1016/j.jes.2023.03.002

Yuqing Ma, Bo Wang, Xiaodi Li, Shuo Wang, Wen Wang, Yongzhen Peng

{"title":"Enrichment of anammox biomass during mainstream wastewater treatment driven by achievement of partial denitrification through the addition of bio-carriers","authors":"Yuqing Ma, Bo Wang, Xiaodi Li, Shuo Wang, Wen Wang, Yongzhen Peng","doi":"10.1016/j.jes.2023.03.002","DOIUrl":"https://doi.org/10.1016/j.jes.2023.03.002","url":null,"abstract":"<div>Anammox is widely considered as the most cost-effective and sustainable process for nitrogen removal. However, how to achieve the enrichment of anammox biomass remains a challenge for its large-scale application, especially in mainstream wastewater treatment. In this study, the feasibility of enrichment of anammox biomass was explored through the realization of partial denitrification and the addition of bio-carriers. By using ordinary activated sludge, a sequencing batch reactor (SBR) followed by an up-flow anaerobic sludge bed (UASB) was operated at 25 ± 2°C for 214 days. The long-term operation was divided into five phases, in which SBR and UASB were started-up in Phases I and II, respectively. By eliminating oxygen and adjusting the inflow ratios in Phases III-V, advanced nitrogen removal was achieved with the effluent total nitrogen being 4.7 mg/L and the nitrogen removal efficiency being 90.5% in Phase V. Both in-situ and ex-situ activity tests demonstrated the occurrence of partial denitrification and anammox. Moreover, 16S rRNA high-throughput sequencing analysis revealed that Candidatus Brocadia was enriched from below the detection limit to in biofilms (0.4% in SBR, 2.2% in UASB) and the floc sludge (0.2% in SBR, 1.3% in UASB), while Thauera was mainly detected in the floc sludge (8.1% in SBR, 8.8% in UASB), which might play a key role in partial denitrification. Overall, this study provides a novel strategy to enrich anammox biomass driven by rapid achievement of partial denitrification through the addition of bio-carriers, which will improve large-scale application of anammox processes in mainstream wastewater treatment.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"137 ","pages":"Pages 181-194"},"PeriodicalIF":6.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49745239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Growth of Ag/g-C3N4 nanocomposites on nickel foam to enhance photocatalytic degradation of formaldehyde under visible light Ag/g-C3N4纳米复合材料在泡沫镍表面生长以增强可见光下甲醛的光催化降解

IF 6.9

Journal of environmental sciences Pub Date : 2024-03-01 Epub Date: 2023-02-13 DOI: 10.1016/j.jes.2023.02.003

Ze Wang , Zhi Huang , Jiang Yu , Xiao Shao , Weidong Peng , Jie Yu , Yinying Jiang

{"title":"Growth of Ag/g-C3N4 nanocomposites on nickel foam to enhance photocatalytic degradation of formaldehyde under visible light","authors":"Ze Wang , Zhi Huang , Jiang Yu , Xiao Shao , Weidong Peng , Jie Yu , Yinying Jiang","doi":"10.1016/j.jes.2023.02.003","DOIUrl":"https://doi.org/10.1016/j.jes.2023.02.003","url":null,"abstract":"<div>Formaldehyde is a pollutant that significantly affects the indoor air quality. However, conventional remediation approaches can be challenging to deal with low-concentration formaldehyde in an indoor environment. In this study, Photocatalysts of Ag/graphitic carbon nitride (g-C3N4)/Ni with 3D reticulated coral structure were prepared by thermal polymerization and liquid phase photo-deposition, using nickel foam (NF) as the carrier. Experiments demonstrated that when the Ag concentration was 3%, and the relative humidity was 60%, the Ni/Ag/g-C3N4 showed the maximum degradation rate of formaldehyde at 90.19% under visible light irradiation, and the formaldehyde concentration after degradation was lower than the Hygienic standard stated by the Chinese Government. The porous structure of Ni/Ag/g-C3N4 and the formation of Schottky junctions promoted the Adsorption efficiency and degradation of formaldehyde, while the nickel foam carrier effectively promoted the desorption of degradation products. Meanwhile, the degradation rate was only reduced by 3.4% after 16 recycles, the three-dimensional porous structure extended the lifetime of the photocatalyst. This study provides a new strategy for the degradation of indoor formaldehyde at low concentrations.</div>","PeriodicalId":15774,"journal":{"name":"Journal of environmental sciences","volume":"137 ","pages":"Pages 432-442"},"PeriodicalIF":6.9,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49744909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5