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Exploring seasonal variability in water quality of Nyabarongo River in Rwanda via water quality indices and DPSIR modelling

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environmental Science and pollution Research 2024年第31期31卷 44329-44347页

作者： Umuhoza, Mycline Niu, Dongjie Li, Fengting College of Environmental Science and Engineering Tongji University 1239 Siping Rd. Shanghai200092 China State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University 1239 Siping Rd. Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security North Zhongshan Rd. 1515 Shanghai200092 China

Understanding seasonal variations in water quality is crucial for effective management of freshwater rivers amidst changing environmental conditions. This study employed water quality index (WQI), metal index (MI), and pollution indices (PI) to comprehensively assess water quality and pollution levels in Nyabarongo River of Rwanda. A dynamic driver-pressure-state-impact-response model was used to identify factors influencing quality management. Over 4 years (2018–2021), 69 samples were collected on a monthly basis from each of the six monitoring stations across the Nyabarongo River throughout the four different seasons. Maximum WQI values were observed during dry long (52.90), dry short (21.478), long rain (93.66), and short rain (37.4) seasons, classified according to CCME 2001 guidelines. Ion concentrations exceeded WHO standards, with dominant ions being HCO3- and Mg2+. Variations in water quality were influenced by factors such as calcium bicarbonate dominance in dry seasons and sodium sulfate dominance in rainy seasons. Evaporation and precipitation processes primarily influenced ionic composition. Metal indices (MI) exhibited wide ranges: long dry (0.2–433.0), short dry (0.1–174.3), long rain (0.1–223.7), and short rain (0.3–252.5). The hazard index values for Cu2+, Mn4+, Zn2+, and Cr3+ were below 1, ranging from 8.89E − 08 to 7.68E − 07 for adults and 2.30E − 07 to 5.02E − 06 for children through oral ingestion, and from 6.68E − 10 to 5.07E − 07 for adults and 6.61E − 09 to 2.54E − 06 for children through dermal contact. With a total carcinogenic risk of less than 1 for both ingestion and dermal contact, indicating no significant health risks yet send strong signals to Governmental management of the Nyabarongo River. Overall water quality was classified as marginal in long dry, poor in short dry, good in long rain, and poor again in short rain seasons. Graphical Abstract: (Figure presented.) © The Author(s), under exclusive licence to Springer-Verlag GmbH Ger

关键词： Rain

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Real-world emission characteristics of carbonyl compounds from agricultural machines based on a portable emission measurement system

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Journal of environmental Sciences 2023年第2期124卷 846-859页

作者： Wenhan Yu Xianbao Shen BoboWu Lei Kong Kaijie Xuan Cheng Zhao Xinyue Cao Xuewei Hao Xin Li Hanyu Zhang Zhiliang Yao School of Ecology and Environment Beijing Technology and Business UniversityBeijing 100048China State Environmental Protection Key Laboratory of Food Chain Pollution Control Beijing Technology and Business UniversityBeijing 100048China Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry Beijing Technology and Business UniversityBeijing 100048China

Emissions of carbonyl compounds from agricultural machines cannot be *** compounds can cause the formation of ozone(O3)and secondary organic aerosols,which can cause photochemical smog to *** this study,20 agricultural machines were tested using portable emission measurement system(PEMS)under real-world tillage *** exhaust gases were sampled using 2,4-dinitrophenylhydrazine cartridges,and 15 carbonyl compounds were analyzed by high-performance liquid *** compound emission factors for agricultural machines were 51.14–3315.62 mg/(kg-fuel),and were 2.58±2.05,0.86±1.07 and 0.29±0.20 g/(kg-fuel)for China 0,China II and China III emission standards,*** compound emission factor for sowing seeds of China 0 agricultural machines was 3.32±1.73 g/(kg-fuel).Formaldehyde,acetaldehyde and acrolein were the dominant carbonyl compounds *** in emission standards and tillage processes impact ozone formation potential(OFP).The mean OFP was 20.15±16.15 g O3/(kg-fuel)for the China 0 emission *** OFP values decreased by 66.9% from China 0 to China II,and 67.4%from China II to China *** mean OFP for sowing seeds of China 0 agricultural machines was 25.92±13.84 g O3/(kg-fuel).Between 1.75 and 24.22 times more ozone was found to be formed during sowing seeds than during other processes for China 0 and China II agricultural *** carbonyl compound emissions from agricultural machines in China was 19.23 Gg in *** results improve our understanding of carbonyl compound emissions from agricultural machines in China.

关键词： Agricultural machines Carbonyl compounds Emission characteristics Tillage process PEMS

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Enhanced methane production from waste activated sludge by potassium ferrate combined with thermal hydrolysis pretreatment

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environmental Science and pollution Research 2024年第33期31卷 45862-45874页

作者： Guo, Bing Zeng, Jiachen Hao, Yuchi Hu, Jiawei Li, Zhuo State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science & ampEngineering Tongji University 1239 Siping Road Shanghai200092 China CCCC National Engineering Research Center of Dredging Technology and Equipment Co. Ltd. Shanghai200082 China

Anaerobic digestion of waste activated sludge (WAS) was one of the directions of sludge treatment, but how to effectively improve the production of methane as a resource product of anaerobic digestion of sludge still needs further research. The study examined how the combination of potassium ferrate (PF) and thermal hydrolysis (TH) pretreatment affected methane production from sludge. The results demonstrated a positive synergistic effect on methane production with PF-TH pretreatment. Specifically, by employing a 0.05 g/g TSS (total suspended solids) PF in conjunction with TH at 80 °C for 30 min, the methane yield increased from 170.66 ± 0.92 to 232.73 ± 2.21 mL/g VSS (volatile suspended solids). The co-pretreatment of PF and TH has been substantiated by mechanism studies to effectively enhance the disintegration and biodegradability of sludge. Additionally, the variation of microbial community revealed an enrichment of active microorganisms associated with anaerobic digestion after treated with PF + TH, resulting in a total abundance increase from 11.87 to 20.45% in the PF + TH group. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Anaerobic digestion

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Nano Fe_(2)O_(3)embedded in montmorillonite with citric acid enhanced photocatalytic activity of nanoparticles towards diethyl phthalate

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Journal of environmental Sciences 2021年第3期33卷 248-259页

作者： Zhaoyue Sun Lisha Feng Guodong Fang Longgang Chu Dongmei Zhou Juan Gao Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science Chinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China

Nano-Fe_(2)O_(3)embedded in montmorillonite particles(Fe-Mt)were prepared to degrade diethyl phthalate(DEP)with citric acid(CA)under xenon light *** to pristine montmorillonite(Na-Mt),the embedding process increased 14.5-fold of iron content and 1.8-fold of specific surface *** synthesized Fe-Mt have more oxygen vacancies than Fe_(2)O_(3)nanoparticles(nFe_(2)O_(3)),which could induce more reactive oxygen species(ROSs)generation in the presence of CA under xenon lamp ***-Mt with CA enhanced photo-assisted degradation of DEP 2.5 times as compared to nFe_(2)O_(3)with *** experiments,electron paramagnetic resonance(EPR)spectroscopy and identification of products confirmed that surface-bound·OH was the main radical to degrade *** anions(i.e.,NO_(3)-,CO_(3)^(2-),Cl^-)and humic acid could compete·OH with DEP and cause slower degradation of *** removal efficiency of DEP was more than 56%with Fe-Mt after three recycles,and the dissolved Fe concentration from Fe-Mt was below 75μmol/L,indicating Fe-Mt had a good stability as a ***-Mt together with CA appeared to be a promising strategy to remove organic pollutants in surface water,or topsoil under solar irradiation.

关键词： Heterogeneous catalyst Hydroxyl radical Photo-Fenton reactions Phthalate ester

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Effect of drum structure on particle mixing behavior based on DEM method

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Particuology 2023年第3期74卷 74-91页

作者： Ganggang Xu Yong Zhang Xigang Yang Guoqing Chen Baosheng Jin Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing210096China State Key Laboratory of Clean and Efficient Coal-fired Power Generation and Pollution Control China Energy Science and Technology Research Institute Co.Ltd.Nanjing210023China

The optimization of the drum structure is beneficial to improve the particle motion and mixing in rotary *** this work,two kinds of drum structures,Lacy cylinder drum(LC)and Lacy-lifters cylinder drum(LLC),are developed on the basic of cylinder drum to enhance the heat transfer *** particle motion and mixing process are simulated by DEM *** on the grid independence and model validation,the contact number between particles and wall,particle velocity profile,thickness of active layer,particle exchange coefficient,particle concentration profile and mixing index are *** influences of the drum structure and the operation parameters are further *** results show that the contact number between particles and wall is improved in LC and LLC compared to cylinder *** particle velocity in LC is higher than that in cylinder drum at high rotating speed,and the particle velocity of the particle falling region is significantly improved in *** to cylinder drum and LC,the thickness of active layer in LLC is smaller,while the local particle mixing quality is proved to be the best in the active *** addition,the particle exchange coefficients between static region and active region in the three drums are compared and LLC is found tending to weaken the particle ***,the fluctuations of particle concentration in the active region,static region,and boundary region are weakened in LLC,and the equilibrium state is reached *** addition,the overall particle mixing performance in cylinder drum,LC and LLC is *** particle mixing performance in cylinder drum is the worst,while the difference in mixing quality of LC and LLC depends on the operation conditions.

关键词： Rotating drum Drum structure Particle velocity profile Thickness of active layer Particle mixing

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High glass transition temperature dopant-free hole transport material via D-A-π-A-D-strategy for perovskite solar cell

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Rare Metals 2024年第12期43卷 6373-6383页

作者： Cheng-Hui Liao Li-Gang Yuan Yi-Heng Zhang Wei-Ya Zhu Min-Chao Qin Zhi-Bo He Jie-Lin Huang Hao-Lin Xiao Zhi-Heng Li Xin-Hui Lu Ke-You Yan Yuan Li State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSchool of Materials Science and EngineeringSouth China University of TechnologyGuangzhou510640China School of Environment and Energy State Key Laboratory of Luminescent Materials and DevicesGuangdong Provincial Key Laboratory of Solid Wastes Pollution Control and RecyclingSouth China University of TechnologyGuangzhou510000China Department of Physics The Chinese University of Hong KongHong Kong999077China

Despite the great leap forward perovskite solar cells(PSCs)have achieved in power conversion efficiency,the device instability remains one of the major problems plaguing its ***-free hole transport material(HTM)has been widely studied as an important strategy to improve the stability of PSCs due to its avoidance of moisture-sensitive dopants and cumbersome doping *** this work,a series of dopant-free HTMs L1F,L2F and L3F based on D-A-π-A-D configuration were synthesized through two steps of reaction.L3F presents a high glass transition temperature of 1800C and thermal decomposition temperature of ***,electron paramagnetic resonance signals of L1F,L2F and L3F powders indicate the open-shell quinoidal diradical resonance structure in their aggregation state due to aggregation-induced radical *** these HTMs present higher hole mobility than dopant-free Spiro-OMeTAD,and the dopant-free L3F-based PSC device achieves the highest power conversion efficiency of 17.6%among *** addition,due to the high hydrophobic properties of L1F,L2F and L3F,the perovskite films spin-coated with these HTMs exhibit higher humidity stability than doped *** results demonstrate a promising design strategy for high glass transition temperature dopant-free hole transport *** open-shell quinoid-radical organic semiconductors are not rational candidates for dopant-free HTMs for PSC devices.

关键词： Perovskite solar cells Dopant-free Hole transport materials D-A-π-A-D High glass transition temperature

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Metagenomic insights into the profile of antibiotic resistomes in sediments of aquaculture wastewater treatment system

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Journal of environmental Sciences 2022年第3期34卷 345-355页

作者： Jianfei Chen Yuyin Yang Xinshu Jiang Yanchu Ke Tao He Shuguang Xie State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China State Key Joint Laboratory of Environment Simulation and Pollution Control(SKJLESPC) Beijing Key Laboratory for Emerging Organic Contaminants Control(BKLEOC)School of EnvironmentPOPs Research CenterTsinghua UniversityBeijing 100084China South China Institute of Environmental Sciences(SCIES) Ministry of Ecology and Environment(MEE)Guangzhou 510655China

To meet the rapidly growing global demand for aquaculture products,large amounts of antibiotics were used in aquaculture,which might accelerate the evolution of antibiotic-resistant bacteria(ARB)and the propagation of antibiotic genes(ARGs).In our research,we revealed the ARGs profiles,their co-occurrence with mobile genetic elements(MGEs),and potential hosts in sediments of a crab pond wastewater purification system based on metagenomic *** residual antibiotic seems to increase the propagation of ARGs in the crab pond,but there was no clear relationship between a given antibiotic type and the corresponding resistance *** effect of aquaculture on sediment was not as profound as that of other anthropogentic activities,but increased the relative abundance of sulfon-amide resistance gene.A higher abundance of MGEs,especially plasmid,increased the po-tential ARGs dissemination risk in crab and purification *** and sulfonamide resistance genes had greater potential to transfer because they were more frequently carried by *** horizontal gene transfer was likely to occur among a variety of microorgan-isms,and various ARGs hosts including Pseudomonas,Acinetobacter,Escherichia,and Klebsiella were *** community influenced the composition of ARG hosts,and Pro-teobacteria was the predominant ***,our study provides novel insights into the environmental risk of ARGs in sediments of aquaculture wastewater treatment system.

关键词： Metagenomic sequencing Aquaculture Antibiotic resistome Antibiotic resistance genes(ARGs) Mobile genetic elements(MGEs) ARG hosts

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Reproductive toxicity and underlying mechanisms of di(2-ethylhexyl) phthalate in nematode Caenorhabditis elegans

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Journal of environmental Sciences 2021年第7期33卷 1-10页

作者： Jingjing Li Man Qu Mei Wang Ying Yue Zhaofang Chen Ran Liu Yuanqing Bu Yunhui Li Key Laboratory of Environmental Medicine Engineering Ministry of EducationSchool of Public HealthSoutheast UniversityNanjing 210009China State Key Laboratory of Pollution Control&Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Nanjing Institute of Environmental Science Key Laboratory of Pesticide Environmental Assessment and Pollution ControlMinistry of Ecology and EnvironmentNanjing 210042China

DEHP(di(2-ethylhexyl) phthalate) is an endocrine disruptor commonly found in plastic products that has been associated with reproduction alterations, but the effect of DEHP on toxicity is still widely unknown. Using DEHP concentrations of 10, 1, and 0.1 mg/L, we showed that DEHP reduced the reproductive capacity of Caenorhabditis elegans after 72 hr. of exposure. DEHP exposure reduced the reproductive capacity in terms of decreased brood sizes, egg hatchability(0.1, 1 and 10 mg/L), and egg-laying rate(1 and 10 mg/L), and increased numbers of fertilized eggs in the uterus(1 and 10 mg/L). DEHP also caused damage to gonad development. DEHP decreased the total number of germline cells, and decreased the relative area of the gonad arm of all exposure groups, with worms in the 1 mg/L DEHP exposure group having the minimum gonad arm area. Additionally, DEHP caused a significant concentration-dependent increase in the expression of unc-86. Autophagy and ROS contributed to the enhancement of DEHP toxicity in reducing reproductive capacity, and glutathione peroxidase and superoxide dismutase were activated as the antioxidant defense in this study. Hence, we found that DEHP has a dual effect on nematodes. Higher concentration(10 mg/L) DEHP can inhibit the expression of autophagy genes( atg-18, atg-7, bec-1, lgg-1 and unc-51), and lower concentrations(0.1 and 1 mg/L) can promote the expression of autophagy genes. Our data highlight the potential environmental risk of DEHP in inducing reproductive toxicity toward the gonad development and reproductive capacity of environmental organisms.

关键词： DEHP Brood sizes Autophagy Reactive oxygen species Superoxide dismutase Glutathione peroxidase

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Climate Downscaling Using Neural Operator: Spatiotemporal Multimodal Fusion Operator with state-Query Coupled Kernel

Climate Downscaling Using Neural Operator: Spatiotemporal Mu...

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2025 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2025

作者： Zhang, Haodi Wang, Yichi Jian, Yifan Jiang, Jiahui Bai, Zhaohai Ma, Lin College of Computer Science and Software Engineering Shenzhen University China Center for Agricultural Resources Research Institute of Genetic and Developmental Biology Chinese Academy of Sciences China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University China

ISBN: (纸本)9798350368741

Climate downscaling is crucial for detailed small-scale analysis and for acquiring climate data in regions without weather stations. Operator learning has proven potential for this task. However, several challenges remain in operator learning, such as multimodal fusion, spatiotemporal fusion and input state and query adaptation. To address these challenges, we propose a Spatiotemporal Multimodal Fusion Operator with a state-Query Coupled Kernel (SMCK). This framework includes a latent space fusion encoder that encodes climate variables using position-wise multihead attention for multimodal fusion and integrates historical information to generate robust and precise representation. Additionally, we introduce a state-query coupled kernel that combines radial basis functions and discrete fourier encoding to enhance query location representation, while also adapting to the state to obtain the coupled kernel. Extensive experiments demonstrate that our method achieves state-ofthe-art performance and provides strong support for climate downscaling and the planning of climate-related strategies. © 2025 IEEE.

关键词： Climate downscaling Deep Learning Multimodal fusion Operator learning Time series forecasting

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Z型电荷分离介导的0D/2D AgVO_(3)/TiO_(2)异质结用于增强光催化CO_(2)还原

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Science China Materials 2024年第6期67卷 1820-1829页

作者：王鋙葶蒋娟姚楠左淦丞朱文磊郭秀云鲜啟鸣 State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Jiangsu Engineering Lab of Water and Soil Eco-Remediation School of EnvironmentNanjing Normal UniversityNanjing 210023China Key Laboratory of Chinese Cuisine Intangible Cultural Heritage Technology Inheritance School of Tourism and CuisineYangzhou UniversityYangzhou 225127China

合理利用Z型电荷调节机制是提高光催化CO_(2)还原效率的有效策略.在本工作中,通过将AgVO_(3)量子点(QDs)原位锚定在TiO_(2)纳米片(NSs)上,从而构建了0D/2D AgVO_(3)/TiO_(2)直接Z型异质结光催化剂.TiO_(2)NSs抑制了AgVO_(3)量子点自身... 详细信息

合理利用Z型电荷调节机制是提高光催化CO_(2)还原效率的有效策略.在本工作中,通过将AgVO_(3)量子点(QDs)原位锚定在TiO_(2)纳米片(NSs)上,从而构建了0D/2D AgVO_(3)/TiO_(2)直接Z型异质结光催化剂.TiO_(2)NSs抑制了AgVO_(3)量子点自身的团聚,从而优化了体系的形貌结构.AgVO_(3)QDs增强了复合材料的光吸收能力,从而提高了对太阳光的利用效率.同时,两种单体之间匹配的能带结构和合适的内部界面电场(即(-)AgVO_(3)/(+)TiO_(2))促进了直接Z型异质结的构建,从而显著促进了光生电子-空穴对的分离,并保持了体系中最高的氧化还原电位.优化后的AgVO_(3)/TiO_(2)复合材料在没有任何助催化剂的情况下,表现出具有竞争力的光催化CO_(2)还原效率(CO,47.61μmol h-1g-1),是原始TiO_(2)NSs的20.97倍.本工作提出了一种直接Z型异质结的合理设计方法,为高效光催化CO_(2)还原催化剂的开发提供了指导.

关键词： photocatalytic CO_(2)reduction direct Z-scheme het-erojunction internal interfacial electric field TiO2 nanosheets AgVO_(3)quantum dots

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