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Enhanced nitrate reduction in hypotrophic waters with integrated photocatalysis and biodegradation

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Environmental Science and Ecotechnology 2024年第5期21卷 133-140页

作者： Bingjie Xue li tian yaqi liu lingxiu Peng Waheed Iqbal liangzhong li Yanping Mao College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen518071PR China School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi'an710072PR China Guangzhou institute of Energy Conversion Chinese Academy of SciencesGuangzhou510640PR China

Addressing nitrate contamination in water bodies is a critical environmental challenge,and Intimately Coupling Photocatalysis and Biodegradation(ICPB)presents a promising ***,there is still debate about the effectiveness of ICPB in reducing nitrate under hypotrophic *** research is needed to understand its microbial metabolic mechanism and the functional changes in bacterial *** we explored microbial metabolic mechanisms and changes in bacterial structure in ICPB reactors integrating a meticulously screened TiO_(2)/g-C3N4 photocatalyst with *** achieved a 26.3%increase in nitrate reduction using 12.2%less organic carbon compared to traditional biodegradation *** analysis of the microbial communities in ICPB reactors revealed evolving metabolic pathways conducive to nitrate *** 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.

关键词： Nitrate reduction Photocatalysis Activated sludge Biodegradation Metabolic pathway

Study on the proposed environmental guidelines for Cd, Hg, Pb and As in soil of china

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Journal of Environmental sciences 1992年第1期4卷 66-73页

作者： Wu Yanyu, tian junliang Zhou Qixinginstitute of Applied Ecology, chinese academy of sciences, Shenyang 110015, chinaNorthwest institute of water and soil conservation, chinese academy of sciences, shaanxi 712.00, china

This paper deals with the soil-environmental standard. According to the current situation of researching on the soil-environmental quality guideline at home and abroad, and on the basis of the foundations and principles of enacting the soil-environmental standard, the soil environment quality guideline values of Hg, Cd, Pb and As were suggested.

关键词： soil-environmental standard soil guideline heavy metal functional land use soil background content.

Inhibition of Defect-Induced Ice Nucleation, Propagation, and Adhesion by Bioinspired Self-Healing Anti-Icing Coatings

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Research 2024年第1期2023卷 237-246页

作者： Shu tian Ruiqi li Xinmeng liu Jiancheng Wang Junyu Yu Sijia Xu Yunqing tian Jing Yang Lei Zhang Department of Biochemical Engineering Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering(MOE)School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China Binzhou institute of Technology Weiqiao-UCAS Science and Technology ParkBinzhou CityShandong Province 256606China

Anti-icing coatings on outdoor infrastructures inevitably suffer from mechanical injuries in numerous icing scenarios such as hailstorms,sandstorms,impacts of foreign objects,and icing–deicing ***,the mechanisms of surface-defect-induced icing are *** the defects,water molecules exhibit stronger adsorption and the heat transfer rate increases,accelerating the condensation of water vapor as well as ice nucleation and ***,the ice–defect interlocking structure increases the ice adhesion ***,a self-healing(at−20℃)antifreeze-protein(AFP)-inspired anti-icing coating is *** coating is based on a design that mimics the ice-binding and non-ice-binding sites in *** enables the coating to markedly inhibit ice nucleation(nucleation temperatureling anti-icing coating for outdoor infrastructures.

关键词： coating defect clarified

soil water characteristics in mountain poplar stand and its benefits to soil and water conservation in loess hilly region

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Journal of Environmental sciences 1994年第3期6卷 347-354页

作者： Wu Qinxiao liu Xiangdong Zhao Hongyan Northwestern institute of soil and water conservation,chinese academy of sciences and Ministry of water Conservancy),Yangling 712.00,china)

The soil physical properties,its water characteristics and the benefits to soil and water conservation in mountain poplar stand were determined and studied. The results of the study show that the compaction in soil profile is relatively *** specific gravity and volume weight of soil increase with deepening of soil horizon. The water infiltration rate of soil in the stand is 17,6 times as high as in *** to the intense absorption of water by root system of plants,a drying layer is formed in soil horizon from 2.3 m to 2.7m,showing that the subsoil moisture is in the state of deficit. The annual water storage capacity in 2 m of soil horizon is 360 mm 370mm,or 63% 65% of annual precipitation. Compared with farmland,mountain poplar stand reduces the surface runoff and soil loss by 70% and 99%,respectively,indicating the great benefits to soil and water conservation.

关键词： mountain poplar soil water characteristics soil and water conservation.

Using soil surface gray level to determine surface soil water content

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Science china Earth sciences 2010年第10期53卷 1527-1532页

作者： ZHU YuanJun1,2,WANG YunQiang1,2 & SHAO MingAn1,2 1 State Key Laboratory of soil Erosion and Dryland Farming on Loess Plateau,institute of soil and water conservation,Northwest A & F University,Yangling 712.00,china 2 institute of soil and water conservation,chinese academy of sciences & Ministry of water Resources,Yangling 712.00,china 1. State Key Laboratory of soil Erosion and Dryland Farming on Loess Plateau Institute of Soil and Water Conservation Northwest A & F University Yangling 712100 China2. Institute of Soil and Water Conservation Chinese Academy of Sciences & Ministry of Water Resources Yangling 712100 China

How to determine surface soil water content(SWC) quickly and accurately is fundamental in studying eco-hydrological processes and their *** we use laboratory experiments to determine surface SWC using soil surface gray level(SGL) values.A negatively exponential relationship exists between SGL and SWC,i.e.,SGL increases with the decrease of *** can be estimated based on initial SGL value(surface gray level when SWC=0),SWC,and a surface roughness coefficient characterized by mean soil particle *** variation range of SGL was larger than that of SWC,indicating that changes in SWC were enhanced in SGL,and that SGL would thus be sensitive to changes in soil *** the 95% confidence level,SWC can be determined by using the relationship between SWC and SGL established by the *** determination of SWC has a high precision when SWC was between dry and saturated.

关键词： Loess Plateau soil water remote sensing surface roughness

Enhancing nitrogen removal in constructed wetlands: The role of influent substrate concentrations in integrated vertical-flow systems

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Environmental Science and Ecotechnology 2024年第5期21卷 103-112页

作者： Tongtong liu Da li Yan tian Jiajie Zhou Ye Qiu Dongyi li Guohong liu Yujie Feng State Key Laboratory of Urban water Resource and Environment School of EnvironmentHarbin Institute of TechnologyNo.73 Huanghe RoadNangang DistrictHarbin 150090China institute of Chemical Engineering in Heilongjiang Province 3#Nanhu loadHigh Tech R&D Zone of Harbin CityHarbin 150028China

Recent advancements in constructed wetlands(CWs)have highlighted the imperative of enhancing nitrogen(N)removal ***,the variability in influent substrate concentrations presents a challenge in optimizing N removal strategies due to its impact on removal efficiency and *** we show the interplay between influent substrate concentration and N removal processes within integrated vertical-flow constructed wetlands(IVFCWs),using wastewaters enriched with NO_(3)^(-)-N and NH4þ-N at varying carbon to nitrogen(C/N)ratios(1,3,and 6).In the NO_(3)^(-)-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 ***,in NH4þ-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 *** community analysis and metabolic pathway assessment revealed that anaerobic denitrification,microbial N assimilation,and dissimilatory nitrate reduction to ammonium(DNRA)predominated in NO_(3)^(-)-N systems with higher C/N ratios(C/N 3).In contrast,aerobic denitrification and microbial N assimilation were the primary pathways in NH4þ-N systems and low C/N NO_(3)^(-)-N systems.A mass balance approach indicated denitrification and microbial N assimilation contributed 4.12-47.12%and 8.51e38.96%in NO_(3)^(-)-N systems,respectively,and 0.55e17.35%and 7.83e33.55%in NH4þ-N systems to TN *** enhance N removal,strategies for NO_(3)-N dominated systems should address carbon source limitations and electron competition between denitrification and DNRA processes,while NH4þ-N dominated systems require optimization of carbon utilization pathways,and ensuring adequate DO and alkalinity supply.

关键词： Constructed wetland Nitrogen removal pathway Denitrification Microbial nitrogen assimilation Enhanced strategy

Generating ^(1)O_(2) and Co^(IV)=O through efficient peroxymonosulfate activation by ZnCo_(2)O_(4)nanosheets for pollutant control

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Nano Research 2024年第9期17卷 8025-8035页

作者： Xiaoke Zhang Yangyang Zhang Jiaqi tian Yadan Guo Zhongkui Zhou Zhongyi liu Zaiwang Zhao Bin liu Jun li College of Chemistry Henan Institute of Advanced TechnologyZhengzhou UniversityZhengzhou 450052China State Key Laboratory of Coking Coal Resources Green Exploitation Zhengzhou UniversityZhengzhou 450001China School of water Resources and Environmental Engineering East China University of TechnologyNanchang 330013China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China College of Energy Materials and Chemistry College of Chemistry and Chemical EngineeringInnerMongolia UniversityHohhot 010070China

Heterogeneous advanced oxidation processes(AOPs)based on non-radical reactive species are considered as a powerful technology for wastewater purification due to their long half-lives and high adaptation in a wide pH ***,we fabricate surface Co defect-rich spinel ZnCo_(2)O_(4)porous nanosheets,which can generate≡CoIV=O and ^(1)O_(2) over a wide pH range of 3.81-10.96 by the formation of amphoteric≡Zn(OH)2 in peroxymonosulfate(PMS)activation *** functional theory(DFT)calculations show Co defect-rich ZnCo_(2)O_(4)possesses much stronger adsorption ability and more electron transfer to ***,the adsorption mode changes from terminal oxygen Co-O-Co to Co-O,accelerating the polarization of adjacent oxygen,which is beneficial to the generation of≡CoIV=O and Generating ^(1)O_(2) .Co defect-rich ZnCo_(2)O_(4)porous nanosheets exhibit highly active PMS activation activity and stability in p-nitrophenol(PNP)degradation,whose toxicity of degradation intermediates is significant *** Co defect-rich ZnCo_(2)O_(4)nanosheet catalyst sponge/PMS system achieved stable and efficient removal of PNP with a removal efficiency higher than 93%over 10 *** work highlights the development of functional catalyst and provides an atomic-level understanding into non-radical PMS activation process in wastewater treatment.

关键词： advanced oxidation processes ZnCo_(2)O_(4)nanosheets peroxymonosulfate activation CoIV=O,wastewater treatment

Potential soil Erosion Energy Increase of Loess Slop System Caused by Project Construction

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水土保持通报 1997年第2期 34-37页

作者： Zhang liping Tang Keli (institute of soil and water conservation,chinese academy of sciences and Ministry of water Resources,712.00,Yangling,shaanxi,PRC)

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ＰｏｔｅｎｔｉａｌＳｏｉｌＥｒｏｓｉｏｎＥｎｅｒｇｙＩｎｃｒｅａｓｅｏｆＬｏｅｓＳｌｏｐＳｙｓｔｅｍＣａｕｓｅｄｂｙＰｒｏｊｅｃｔＣｏｎｓｔｒｕｃｔｉｏｎＺｈａｎｇＬｉｐｉｎｇＴａｎｇＫｅｌｉ（ＩｎｓｔｉｔｕｔｅｏｆＳｏｉｌａｎｄＷａｔｅｒＣｏｎｓｅ...

关键词： loess slope system project construction slope surface of steep slant

Spatial distribution of surface rock fragment on hillslopes in a small catchment in wind-water erosion crisscross region of the Loess Plateau

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Science china Earth sciences 2008年第6期51卷 862-870页

作者： ZHU YuanJun1,2 & SHAO MingAn1 1 institute of soil and water conservation, chinese academy of sciences and Ministry of water Resources, Northwest Agriculture and Forestry University, Yangling 712.00, china 2 institute of Geographical sciences and Natural Resources Research, chinese academy of sciences, Beijing 100101, china 1. institute of soil and water conservation Chinese Academy of Sciences and Ministry of Water Resources Northwest Agriculture and Forestry University Yangling 712100 China 2. institute of Geographical sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China

The cover and size distributions of surface rock fragment in hillslopes were investigated by using digital photographing and treating technique in a small catchment in wind-water erosion crisscross region of the Loess Plateau. The results indicated that the maximal cover of rock fragment was pre-sented at mid-position in steep hillslope. Rock fragment presented a general decreasing-trend along the hillslope in gentle hillslope. Rock fragment cover was positively related to gradient, rock fragment size decreased generally along the hillslope, and the size reduced with the gradient. The mean size of rock fragment was at a range of 6―20 mm in the steep hillslope, rock fragment size > 50 mm was rarely presented. The covers of rock fragment at different positions were markedly related to the quantities of rock fragment < 40 mm. The area of rock fragment of 2―50 mm accounted for 60% or more of the total area, dominating the distribution of rock fragment in the hillslopes.

关键词： wind-water erosion crisscross region of the Loess Plateau small catchment hillslope surface rock fragment cover and size