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SSRN 2023年

作者： Chen, Jiahui Ma, Sijia Wang, Haiyue Wang, Yanru Ren, Hongqiang Xu, Ke State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Jiangsu Nanjing210023 China

Biological denitrification is the dominant method for NO3- removal from wastewater, while high NO3- leads to NO2- accumulation and inhibits denitrification performance. In this study, different weak magnetic carriers (0, 0.3, 0.6, 0.9 mT) were used to enhance biological denitrification at NO3- NO3-of 50-2400 mg/L. The effect of magnetic carriers on the removal and mechanism of denitrification of high NO3- was investigated. The results showed that 0.6 and 0.9 mT carriers significantly enhanced the TN removal efficiency (> 99%) and reduced the accumulation of NO2- (by > 97%) at NO3- of 1200-2400 mg/L. 0.6 and 0.9 mT carriers stimulated microbial electron transport by improving the abundances of coenzyme Q-cytochrome C reductase and cytochrome C, which contributed to the enhanced elimination of NO3- and NO2-. The activities of NAR and NIR and the abundances of narG and nirS were greatly elevated by 0.6 and 0.9 mT carriers. Denitrifying microorganisms, e.g., Halomonas, Thauera and Pseudomonas were enriched at 0.6 and 0.9 mT carriers, which benefited to the advanced denitrification performance. This study suggests that weak magnetic carriers can help to enhance the biological denitrification of high NO3- wastewater. © 2023, The Authors. All rights reserved.

关键词： Nitrates

Fe-Mofs Nanosheets for Photo-Fenton Degradation of Carbamazepine

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SSRN 2024年

作者： Sun, Siyu Hu, Youyou Li, Zhengkui State Key Laboratory of Pollution Control and Resource Reuse Nanjing University Nanjing210023 China School of the Environment Nanjing University Nanjing210023 China

Iron-based metal organic framework (Fe-MOF) nanosheets have potential as functional components for photocatalysis. Prospectively, employing Fe-MOF nanosheets as photocatalyst would notably improve the efficiency of photogenerated carrier separation. However, achieving efficient synthesis of Fe-MOF nanosheets remains a challenging task. Here we present a bottom-up synthesis strategy for producing two-dimensional Fe-MOF nanosheets (TFMN) of micrometer lateral dimensions and nanometer thickness. The application of TFMN in the photo-Fenton degradation of carbamazepine (CBZ) demonstrates remarkable CBZ degradation performance and excellent efficiency across a wide range of pH values. The transfer direction of electrons and state density are further calculated by density functional theory. Mechanism analysis reveals that h+, ·OH, and ·O2- are identified as the predominant active species contributing to the catalytic oxidation process in the Vis/TFMN/H2O2 system. © 2024, The Authors. All rights reserved.

关键词： Nanosheets

Weak Magnetic Field Enhances Waste Molasses-Driven Denitrification During Wastewater Treatment

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SSRN 2023年

作者： Wang, Qingxin Lin, Yuan Peng, Ling Wang, Yanru Ma, Sijia Ren, Hongqiang Xu, Ke State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Jiangsu Nanjing210023 China

Waste molasses, the abundant byproducts of the sugar industry, is a cost-efficient carbon source for advanced denitrification. However, the efficiency of waste molasses-driven denitrification is limited by its complex carbon content, hindering its practical application. Weak magnetic field (WMF) is reported to enhance biological nitrogen removal, but its effects on molasses-driven denitrification remains unknown. In this study, we investigated whether the WMF can enhance waste molasses-driven nitrogen removal and explore the underlying mechanisms. We found WMF significantly facilitated waste molasses-driven denitrification, with total nitrogen removal efficiency increased by up to 25% (from 77% to 96%). WMF stimulated the nitrate reductase’s activity by 7-18%, and the enhancement was improved as WMF intensified. Quantitative qPCR analysis indicated that the abundances of denitrifying enzymes increased under WMF, which was consistent with the proliferation of denitrifying bacteria Denitratisoma and Devosia. Our study has demonstrated that WMF is promising for enhancing complex carbon-driven denitrification processes. © 2023, The Authors. All rights reserved.

关键词： Efficiency

Evaluating effects of biochar on anaerobic digestion of dewatered waste activated sludge: Digester performance, microbial co-metabolism and underlying mechanism

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Chemosphere 2023年 341卷 140139页

作者： Li, Dunjie Ping, Qian Guo, Wenjie Chen, Yifeng Wang, Lin Li, Yongmei State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Biochar has been proven to be capable of improving the performance of anaerobic digestion (AD). However, the effect of biochar on microbial communities remains ambiguous. In this study, the influence of pH was excluded in a semi-continuous anaerobic digestor for the treatment of dewatered waste activated sludge (WAS) to determine the effect of biochar on microbes. Compared with the control group, the average methane production increased by 24.5% and 23.2% at the organic loading rates (OLRs) of 1.56 and 3.00 gTS/L/d, respectively, in the presence of biochar. This study innovatively found biochar accelerated the enrichment of Methanofastidiosaceae, which competed with Methanobacteriaceae for H2, and its abundance increased from 0.99% at the OLR of 1.56 g TS/L/d to 16.57% and 38.11% at the OLR of 3.00 and 5.60 gTS/L/d, respectively. The efficient metabolic network of f__norank_o__Aminicenantales, syntrophic bacteria, Methanofastidiosaceae and Methanosaetaceae promoted the conversion of WAS to CH4 in the biochar group. In addition, metagenome analysis revealed that biochar optimized the metabolites related to energy conservation and electron transfer, particularly for hydrogenase (frhABG, mbhLHK and hndA-D), confirming that biochar changed the way H2 was involved in methanogenesis. These findings provide novel insights into the direct effect of biochar on microbial evolution and facilitate the reduction of WAS to achieve higher economic benefits in biogas production. © 2023 Elsevier Ltd

关键词： Anaerobic digestion

Engineering 3D-printed aqueous colloidal ceramic slurry for direct ink writing

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Green Chemical Engineering 2023年第1期4卷 73-80页

作者： Jie Zhu Jiangtao Yu Yingcheng Wu Yanhong Chao Peiwen Wu Linjie Lu Linlin Chen Jing He Wenshuai Zhu School of Chemistry and Chemical Engineering Jiangsu UniversityZhenjiang212013China State Key Laboratory of Heavy Oil Processing China University of Petroleum-BeijingBeijing102249China School of the Environment and Safety Engineering Jiangsu UniversityZhenjiang212013China Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province College of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou571158China

The construction of rapid prototyping for structured ceramics has a promoting effect on potential *** this work,engineering slurry with different formulations were used to develop aqueous colloidal ceramic slurry for direct ink writing(DIW).Optimized slurry of Formulation 5 possessed good printing effect for DIW with stable mechanical *** characteristics,including shrinkage,compressive strength,rheological behavior,and chemical property,were also *** ceramics prepared from optimized slurry can be preliminarily applied to adsorption of Rhodamine B and chlortetracycline,and possessed the advantages of easy separation and operation compared with powder *** work provides a strategy for the design of 3D-printed kaolin ceramic slurry,and also extends to potential application in adsorption.

关键词： 3D printing Direct ink writing Ceramic slurry Kaolin Adsorption

Kinetics and mechanisms of non-radically and radically induced degradation of bisphenol A in a peroxymonosulfate-chloride system

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Environmental Science and Ecotechnology 2024年第6期22卷 191-197页

作者： Zhao Song Yu Zhang Yanhu Yang Yidi Chen Nanqi Ren Xiaoguang Duan State Key Laboratory of Urban Water Resource and Environment Shenzhen Key Laboratory of Organic Pollution Prevention and ControlSchool of Civil and Environmental EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen518055PR China School of Materials and Environmental Engineering Shenzhen Polytechnic UniversityShenzhen518055PR China School of Chemical Engineering The University of AdelaideAdelaideSA5005Australia

Bisphenol A,a hazardous endocrine disruptor,poses significant environmental and human health threats,demanding efficient removal *** biological methods struggle to treat BPA wastewater with high chloride(Cl^(-))levels due to the toxicity of high Cl^(-)to *** persulfate-based advanced oxidation processes(PS-AOPs)have shown promise in removing BPA from high Cl^(-)wastewater,their widespread application is always limited by the high energy and chemical usage *** we show that peroxymonosulfate(PMS)degrades BPA in situ under high Cl^(-)*** was completely removed in 30 min with 0.3 mM PMS and 60 mM Cl^(-).Non-radical reactive species,notably free chlorine species,including dissolved Cl_(2)(l),HClO,and ClO−dominate the removal of BPA at temperatures ranging from 15 to 60℃.Besides,free radicals,including•OH and Cl_(2)^(•−),contribute minimally to BPA removal at 60°*** on the elementary kinetic models,the production rate constant of Cl_(2)(l)(32.5 M^(−1) s^(−1))is much higher than HClO(6.5×10^(−4) M^(−1) s^(−1)),and its degradation rate with BPA(2×10^(7) M^(−1) s^(−1))is also much faster than HClO(18 M^(−1) s^(−1)).Furthermore,the degradation of BPA by Cl_(2)(l)and HClO were enlarged by 10-and 18-fold at 60℃ compared to room temperature,suggesting waste heat utilization can enhance treatment ***,this research provides valuable insights into the effectiveness of direct PMS introduction for removing organic micropollutants from high Cl^(-)*** further underscores the critical kinetics and mechanisms within the PMS/Cl⁻system,presenting a cost-effective and environmentally sustainable alternative for wastewater treatment.

关键词： BPA removal Saline wastewater Peroxymonosulfate Free chlorine Kinetic model

Optimizing Waste Molasses Utilization to Enhance Electron Transfer Via Micromagnetic Carriers: Mechanisms and High-Nitrate Wastewater Denitrification Performance

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SSRN 2023年

作者： Chen, Jiahui Xue, Yi Yang, Dongli Ma, Sijia Lin, Yuan Wang, Haiyue Wang, Yanru Ren, Hongqiang Xu, Ke State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Jiangsu Nanjing210023 China

The biological denitrification of high-nitrate wastewater (HNW) is primarily hindered by insufficient carbon sources and excessive nitrite accumulation. In this study, micromagnetic carriers with varying micromagnetic field (MMF) strengths (0.0, 0.3, 0.6, 0.9 mT) were employed to enhance the denitrification of HNW using waste molasses (WMs) as a carbon source. The results revealed that 0.6 mT MMF significantly improved the total nitrogen removal (TN) efficiency at 96.3%. A high nitrate removal efficiency at 99.3% with a low nitrite accumulation at 25.5 mg/L was achieved at 0.6 mT MMF. The application of MMF facilitated the synthesis of adenosine triphosphate (ATP) and stimulated denitrifying enzymes (e.g., nitrate reductase (NAR), nitrite reductase (NIR), and nitric oxide reductase (NOR)), which thereby promoting denitrification. Moreover, the effluent chemical oxygen demand (COD), tryptophan and fulvic-like substances exhibited their lowest levels at 0.6 mT MMF. Analysis through 16S ribosomal ribonucleic acid gene sequencing indicated a significant enrichment of denitrifying bacteria including CastellaniellaKlebsiella under the influence of MMF. Besides, the proliferation of Acholeplasma, Klebsiella and Proteiniphilum at 0.6 mT MMF promoted the hydrolysis and acidification of WMs. This study offers new insights into the enhanced utilization of WMs and the denitrification of HNW through the application of MMF. © 2023, The Authors. All rights reserved.

关键词： Denitrification

Optimization on the Preparation Conditions of Fe-N/BC Catalyst and its pollution Removal Efficiency 6

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Optimization on the Preparation Conditions of Fe-N/BC Cataly...

2024 6th International Conference on Advanced Materials and Ecological Environment, AMEE 2024

作者： Zhou, Ting Yang, Yang Du, Tianxing Dong, Wenyi Wang, Hongjie School of Civil and Environmental Engineering Harbin Institute of Technology Shenzhen Guangdong Shenzhen518055 China Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control Guangdong Shenzhen518055 China State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Heilongjiang Harbin150090 China

This study was aimed to optimize the preparation conditions of Fe-N/BC catalyst. Citric acid iron and melamine was used to co-doped modified selected biomass, optimized factors included biomass type, acid washing time, iron-nitrogen doping amount and pyrolysis temperature, with nitrobenzene as the targeted degradation object. The optimal preparation conditions for Fe-N/BC iron-nitrogen co-doped biochar catalyst were determined. The results showed that using onion as the biomass, after 8 hours of acid washing, immersed in an ultrasonic solution of citric acid iron with a concentration of 8 g/L for 30 minutes, followed by adding melamine at a doping ratio of 5 g/g biomass and another 30 minutes of ultrasonication, centrifuged, water washed, and dried, then pyrolyzed at 900°C under N2 atmosphere for 1 hour. The obtained Fe-N/BC iron-nitrogen co-doped biochar catalyst exhibited the best removal efficiency for nitrobenzene in a catalytic reduction system, with a removal rate of 96.6% after 15 minutes of reaction. © Published under licence by IOP Publishing Ltd.

关键词： Semiconductor doping

Study on the Morphological Structure Characteristics of the Modified Preparation Fe-N/BC Catalysts 6

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Study on the Morphological Structure Characteristics of the ...

2024 6th International Conference on Advanced Materials and Ecological Environment, AMEE 2024

作者： Yang, Yang Zhou, Ting Du, Tianxing Dong, Wenyi Wang, Hongjie School of Civil and Environmental Engineering Harbin Institute of Technology Shenzhen Guangdong Shenzhen518055 China Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control Guangdong Shenzhen518055 China State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Heilongjiang Harbin150090 China

In this study, the citric acid iron and melamine was used to modify the selected biomass, preparing Fe-N/BC iron-nitrogen co-doped biochar catalyst. The BC, N/BC, and Fe-N/BC were characterized by SEM, XRD, FTIR, Raman, XPS, etc., to research the aspects of micromorphology, crystal structure, surface functional group types, and element composition. The results showed that Fe and N elements could be doped into the biochar successfully, making the particle size of Fe-N/BC smaller than that of BC, possessing a bigger surface area with a more abundant pore structure. Additionally, the graphitization degree of Fe-N/BC was enhanced, introducing active sites including pyridinic nitrogen, graphitic nitrogen, and Fe-Nx, enhancing the catalytic activity and electron transfer performance of the catalyst, enabling Fe-N/BC to simultaneously act on catalytic reduction and catalytic oxidation systems. © Published under licence by IOP Publishing Ltd.

关键词： Catalytic oxidation

Degradation Kinetics of Nitrobenzene and Aniline by Fe-N/BC Redox System 6

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Degradation Kinetics of Nitrobenzene and Aniline by Fe-N/BC ...

2024 6th International Conference on Advanced Materials and Ecological Environment, AMEE 2024

This study was aimed to analysis the degradation kinetics of nitrobenzene and aniline by the Fe-N/BC redox system. Factors such as the initial pH of the solution, PMS/NaBH4 concentrations, and pollutant concentrations were investigated to explore the variations in pollutant degradation rates in the system. The results indicated that the Fe-N/BC-catalyzed NaBH4 reduction of nitrobenzene followed first-order kinetics, while the Fe-N/BC-catalyzed PMS oxidation of aniline followed pseudo-first-order kinetics. When the pH was alkaline, the reaction was inhibited. Increasing the addition of NaBH4 and PMS from 0.05 to 0.5 g/L resulted in the reaction rate constants for nitrobenzene and aniline increasing from 0.115, 0.120 min-1 to 0.743, 0.354 min-1, respectively. As the pollutant concentration gradually rose from 2 to 50 mg/L, the reactions were inhibited, with the reaction kinetics for nitrobenzene and aniline decreasing from 0.348, 0.288 min-1 to 0.147, 0.091 min-1, respectively. © Published under licence by IOP Publishing Ltd.

关键词： Nitrobenzene