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Electrochemical removal of ammonium nitrogen in high efficiency and N_(2) selectivity using non-noble single-atomic iron catalyst

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Journal of Environmental Sciences 2023年第3期125卷 544-552页

作者： Fengjiao Quan Guangming Zhan Bing Zhou Cancan Ling Xiaobing Wang Wenjuan Shen Jianfen Li Falong Jia Lizhi Zhang College of Chemical and Environmental Engineering Wuhan Polytechnic UniversityWuhan 430023China Institute of Environmental&Applied Chemistry College of ChemistryCentral China Normal UniversityWuhan 430079China School of Chemistry and Civil Engineering Shaoguan UniversityShaoguan 512005China

Ammonia nitrogen (NH_(4)^(+)-N) is a ubiquitous environmental pollutant,especially in offshore aquaculture *** oxidation is very promising to remove NH_(4)^(+)-N,but suffers from the use of precious metals *** this work,a robust and cheap electrocatalyst,iron single-atoms distributed in nitrogen-doped carbon (Fe-SAs/N-C),was developed for electrochemical removal of NH_(4)^(+)-N from in wastewater containing *** FeSAs/N-C catalyst exhibited superior activity than that of iron nanoparticles loaded carbon(Fe-NPs/N-C),unmodified carbon and conventional Ti/IrO_(2)-TiO_(2)-RuO_(2)*** high removal efficiency (>99%) could be achieved as well as high N_(2)selectivity (99.5%) at low current *** experiments and density functional theory (DFT) calculations demonstrated the indispensable role of single-atom iron in the promoted generation of chloride derived species for efficient removal of NH_(4)^(+)-*** study provides promising inexpensive catalysts for NH_(4)^(+)-N removal in aquaculture wastewater.

关键词： Ammonia nitrogen removal Single-atom iron Non-noble metal catalyst aquaculture wastewater

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Salt effect on MUCT system performance of nitrogen and phosphorus removal

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Green Energy & Environment 2021年第5期6卷 670-677页

作者： Huining Zhang Zhuowei Zhang Kewei Jiang Zhili Li Kefeng Zhang Jianqing Ma Yongxing Qian NingboTech University Ningbo315100China College of Water Sciences Beijing Normal UniversityBeijing100875China Ningbo Research Institute Zhejiang UniversityNingbo315100China Ningbo Key Laboratory of Urban and Rural Water Pollution Control Technology Ningbo315100China

The effect of salinity on biological nitrogen and denitrifying phosphorus removal was investigated in a Modified University of Cape Town(MUCT)*** rates of COD,NH_(4)^(+)-N,NO_(3)^(-)-N,NO_(2)^(-)-N,phosphorus and the sludge characteristics at salt concentrations(0.0,3.2,6.4,11.2 and 16.0 g L^(-1))were *** the salt concentration increasing,all the COD,NH_(4)^(+)-N,TN and TP removal rates exhibited a trend of decline,and exhibited an initial reduction and subsequent increase at every stage of salt ***_(4)^(+)-N,TN and TP removal rates were 92.7%,51.5%and 67.2%in 16 g L^(-1) salt concentration,*** they were outperformed the literature reported and acceptable in practical *** the salinity of wastewater changed from 0.0 to 16.0 g L^(-1),the biomass yield coefficients increased from 0.0794 to 0.126 g VSS/g *** salinity had a detrimental effect on phosphorus-accumulating organisms(PAOs)and denitrifying PAOs(DPAOs)(especially DPAOs).Therefore,phosphorus removal gradually depended on *** simultaneous nitrification and denitrification(SND)rate and nitrogen removal rate(including nitrification rate,denitrification rate,and total nitrogen removal rate)gradually decreased with the increased salinity.

关键词： aquaculture wastewater Denitrifying phosphorus removal MUCT process TP SND rate

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Treatment of Shrimp Effluent by Integrated Culture of Bivalves and Macroalgae

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Asian Agricultural Research 2021年第5期13卷 33-39页

作者： Tingting ZHOU Jing HE Zhihua LIN Lin HE Ninghai Institute of Mariculture Breeding and Seed Industry Zhejiang Wanli University Ningbo 315604 China

[Objectives]To provide a theoretical basis for constructing the best species suitable for local shrimp-bivalves-algae IMTA through the screening of different bivalves and the determination of seaweed density.[Methods]The preliminary studies of different kind of bivalves and macroalgae(Gracilaria lichevoides)used for the purification of shrimp effluent were *** the screening of benthic bivalves,the best ratio of integrated culture of bivalves and algae was determined.[Results]Both bivalves and macroalgae had certain purification effects on aquaculture wastewater,but the effects significantly differed from species and breeding *** removal rate of nutrient declined from Potamocorbula laevis,Sinonovacula constricta,Tegillarca *** mixotrophic culture of 8 ind/L *** and 120 g *** had the highest efficiency of purification and removal rates of nutrient:NH4-N:90.67%,TP:86.18%,TN:72.66%,NO3-N:51.85%,*** was a significant difference between the blank control group and the other three groups(P0.05).[Conclusions]This research provides a reference for the use of filterable shellfish and large seaweed to treat aquaculture wastewater,and also provides the theoretical basis for constructing the local multi-level breeding structure.

关键词： Filter-feeding bivalves IMTA Gracilaria lichevoides aquaculture wastewater Purification effect Removal rate

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