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Enzyme Pretreatments for Anaerobic Co-Digestion of Food Waste Blended with Bioplastics: Effects on Methane Production and Microbial Community Structure

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SSRN 2023年

作者： Jiang, Xintong Bi, Dongsu Cheng, Yu Wang, Shizhuo Peng, Boyu Shen, Haowen Zhang, Tao Xia, Xuefen Zhang, Yalei Shen, Zheng School of Chemical and Environmental Engineering Shanghai Institute of Technology Shanghai201418 China Institute of New Rural Development Tongji University Shanghai200092 China College of Design and Innovation Tongji University Shanghai200092 China State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China

Bioplastic bags mixed with food waste seem inevitable with the growth of waste classification and the banning of non-biodegradable polymers in China. To solve the asynchronous degradation of both food waste and bioplastics in the anaerobic fermentation process, we investigated the biological pretreatment is more promising, among the physics, chemistry, and biology treatments, because of the efficient catalytic hydrolysis capacity of enzymes. Three kinds of enzymes (amylases, lipases, and proteinase K) with 0.075 g/L were designed to pretreat FW/bioplastic mixture for 48 h at 35°C and 55 °C. The methane production of anaerobic fermentation increased at 55°C by 15.94%, 27.10%, 64.50%, respectively, and the degradation of bioplastic bags time was advanced from 30 to 24 days. SEM indicated apparent physical degradation that holes developed on the surface of the bioplastic after pretreatments with enzymes. FTIR suggested that the peak of 1700 cm-1 is the typical peak of proteinase K depolymerization, which is weaker at 55°C than at 35°C. Following the pretreatments with proteinase K, The new species of bacteria emerged in the substrate microbiome. These results indicated that biological pretreatment is capable of biodegradation and improves the asynchronous problem between food waste and bioplastics. © 2023, The Authors. All rights reserved.

关键词： Enzymes

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Engineering Nanocomposite Metal-Phenolic Network Membranes with Hollow Mofs Via In-Situ Etching for High-Efficiency Organic Solvent Nanofiltration

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SSRN 2022年

作者： Lv, Yan Chen, Yizhou Bai, Yuting Meng, Lijun Zhang, Wenting Xia, Jingjing Xu, Zhiming Sun, Rui Liu, Tianxi State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Innovation Center for Textile Science and Technology College of Materials Science and Engineering Donghua University 2999 North Renmin Road Shanghai201620 China Key Laboratory of Synthetic and Biological Colloids Ministry of Education School of Chemical and Material Engineering Jiangnan University Wuxi214122 China State Key Laboratory of Pollution Control and Resource Reuse Shanghai Institute of Pollution Control and Ecological Security School of Environmental Science and Engineering Tongji University Shanghai200092 China

Organic solvent nanofiltration (OSN), as an emerging membrane separation technology, holds great potential in pharmaceutical and chemical applications. However, the development of such a promising technology is severely retarded by the trade-off between permeability and selectivity. Herein, we report a novel thin-film nanocomposite (TFN) membrane by incorporating hollow metal-organic frameworks (MOFs) into the metal-phenolic network (MPN) selective layer for highly efficient OSN. This nanocomposite selective layer is fabricated via an aqueous deposition of tannic acid (TA) and FeII ions with MOFs, during which the MOFs are in-situ etched to a hollow structure. Attributed to the extra transfer channels provided by hollow MOFs, the methanol permeance of the TFN membranes increases to 24.7 L·m-2·h-1·bar-1, exhibiting an outstanding improvement of 270% compared with the membranes without MOFs (9.1 L·m-2·h-1·bar-1). Meanwhile, the coordination interaction between TA and metal centers in MOFs endows excellent interfacial compatibility between MPN matrix and MOF fillers, guaranteeing a defect-free selective layer and thus high rejection for small organic molecules (> 99% for Alcian blue). Furthermore, various MOFs, including ZIF-67, prussian blue (PB), and MIL-53(Al), are also employed to fabricate MPN/MOF nanocomposite membranes, proving the availability and universality of this facial aqueous deposition strategy. Additionally, we take deep insight into the mechanism of in-situ etching process via density functional theory (DFT) calculations to pave the way for the fabrication of TFN membranes with hollow nanofillers. This work provides a sufficient strategy for the design and construction of novel highly efficient OSN nanocomposite membranes with excellent permeability and retention performance. © 2022, The Authors. All rights reserved.

关键词： Nanofiltration

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Fe-O-Bi efficient electron transfer channels and photo-Fenton synergy in S-scheme heterojunctions: insights into interfacial interactions and ofloxacin degradation

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Green Energy & Environment 2024年

作者： Jiawei Liu Jun Shi Huiping Deng State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Yangtze River Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai 200092 China

Fenton method combined with light to accelerate the production of free radicals from H 2 O 2 can achieve more efficient pollutant degradation. In this paper, a novel BiOI/FeWO 4 S-scheme heterojunction photocatalyst was obtained by in situ synthesis, which can activate H 2 O 2 and degrade the organic pollutant OFC (ofloxacin) under visible light. The S-scheme charge transfer mechanism was confirmed by XPS spectroscopy, in situ KPFM and theoretical calculation. The photogenerated electrons were transferred from FeWO 4 to BiOI driven by the built-in electric field and band bending, which inhibited carrier recombination and facilitated the activation of H 2 O 2 .The BiFe-5/Vis/H 2 O 2 system degraded OFC up to 96.4% in 60 min. This study provides new systematic insights into the activation of H 2 O 2 by S-scheme heterojunctions, which is of great significance for the treatment of antibiotic wastewater.

关键词： H 2 O 2 BiOI/FeWO 4 heterojunction ofloxacin Photo-Fenton

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Enhanced Removal of Bisphenol S in Ozone/Peroxymonosulfate System: Kinetics, Intermediates and Reaction Mechanism

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SSRN 2023年

作者： Tian, Jie Qi, Yumeng Wei, Junyan Ajarem, Jamaan S. Maodaa, Saleh Allam, Ahmed A. Wang, Zunyao Qu, Ruijuan State Key Laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing University Jiangsu Nanjing210023 China Department of Zoology College of Science King Saud University P.O. Box 2455 Riyadh11451 Saudi Arabia Department of Zoology Faculty of Science Beni-suef University Beni Suef65211 Egypt

The degradation process of bisphenol S (BPS) in ozone/peroxymonosulfate (O3/PMS) system was systematically explored. The results showed that the removal efficiency of BPS by O3 could be significantly improved with addition of PMS. Compared with ozonation alone, the pseudo-first-order constant (kobs) was increased by 2-5 times after adding 400 μM PMS. In O3/PMS system, accelerated removal of BPS was observed under neutral and alkaline conditions. The removal efficiency of BPS reached 100% after 40 s of reaction at pH 7.0, with the kobs of 0.098 s-1. Moreover, Cu2+ had a catalytic effect on the O3/PMS system, because it could catalyze the decomposition of ozone and PMS to produce •OH and SO4•-, respectively. Electron paramagnetic resonance illustrated that •OH and SO4•- were the reactive species in O3/PMS system. Twelve intermediates were identified by mass spectrometry, and the degradation reactions in O3/PMS system mainly included hydroxylation, sulfate addition, polymerization and β-scission. Finally, the toxicity of the products was evaluated by the EOCSAR program. Our results introduce an efficient method for BPS removal and would provide some guidance for the development of O3-based advanced oxidation technology. © 2023, The Authors. All rights reserved.

关键词： Ozone

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Investigation of volatile methyl siloxanes in biogas and the ambient environment in a landfill

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Journal of Environmental Sciences 2020年第5期32卷 54-61页

作者： Ning Wang Li Tan Lianke Xie Yu Wang Timothy Ellis School of Environmental Science and Engineering Shandong Key Laboratory of Water Pollution Control and Resource ReuseShandong UniversityJinan266237China Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP^3) Shanghai200433China School of Municipal and Environmental Engineering Shandong Jianzhu UniversityJinan250100China State Grid Shandong Electric Power Company Electric Power Science Research InstituteJinan250100China Beijing Key Laboratory of Water Resources&Environment Engineering China University of Geosciences(Beijing)Beijing100083China Department of Civil Constructionand Environmental EngineeringIowa State UniversityIowaUSA

Landfill biogas is a potential alternative for fossil fuel,but the containing impurities,volatile methyl siloxanes(simplified as siloxanes),often cause serious problems in gas turbines when applied to generate *** this research,a collecting and analyzing method based on solvent adsorption and purge and trap-gas chromatography-mass spectrometry was established to determine the siloxanes in biogas from a landfill in Jinan,China,and adjacent ambient samples,such as soil,air,and leachate of the *** results showed that,octamethylcyclotetrasiloxane(D4)and decamethylcyclopentasiloxane(D5)accounted for 63%of total siloxanes;and without considering D4 and D5,the order of detected siloxanes in concentration was found relating to Gibbs free energies of molecules,namely that higher abundant siloxane(except for D4 and D5)usually had lower Gibbs free ***,the mass ratio between D4 and octamethyltrisiloxane(L3)in the bio gas varied with different garbage age in landfills,possibly revealing the breaking-down of larger siloxane molecules with *** samples,which were collected from environmental samples adjacent to the landfill,such as soil,water,and air,presented much higher siloxane level than urban or rural area away from *** current H2 S scrubber of the landfill biogas could decrease the total siloxanes from 10.7 to 5.75 mg/m^3 due to Fe2 O3 and a refrigerant drier in a purification system and cyclic siloxanes were more easily removed than linear ones.

关键词： Biogas Siloxane Landfill Purge and trap GC-MS

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Prediction Heavy Metal Accumulation Risk in Rice Using Machine Learning and Mapping pollution Risk

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SSRN 2022年

作者： Zhao, Bing Zhu, Wenxuan Hao, Shefeng Hua, Ming Liao, Qiling Jing, Yang Liu, Ling Gu, Xueyuan State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing China Macalester College MinneapolisMN United States Geological Survey of Jiangsu Nanjing China School of Earth Sciences and Engineering Nanjing University Nanjing China

Rapid and accurate prediction of metal bioaccumulation in crops are important for assessing metal environmental risks. We predicted the uptake of Cd, Hg, As and Pb by rice grain using 10 machine learning algorithms based on 2123 pairs of soil-rice samples in Jiangsu province, China. The Extremely Randomized Tree model exhibited the best performance for rice-Cd and rice-Hg (Cd: R2 = 0.824;Hg: R2 = 0.626), while the Random Forest model performed best for As and Pb (As: R2 = 0.389;Pb: R2 = 0.325). The feature importance analysis showed that soil-Cd and pH had the highest impact on rice-Cd risk, which is in line with previous studies;while temperature and SOC were more important to rice-Hg than soil-Hg. Then, based on another set of 1867 uniformly distributed paddy soil samples in Jiangsu Province, the Cd and Hg risks of soil and rice were visualized using the established models. Mapping result revealed an inconsistent pattern of hotspot distribution between soil-Hg and rice-Hg, i.e., a higher rice-Hg risk in the northern area, while higher soil-Hg in south. Our findings highlight the importance of temperature on Hg bioaccumulation risk to crops, which has often been overlooked in previous risk assessment processes. © 2022, The Authors. All rights reserved.

关键词： Risk assessment

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Varied interspecies interactions between anammox and denitrifying bacteria enhanced nitrogen removal in a single-stage simultaneous anammox and denitrification system

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Science of the Total Environment 2022年 813卷 152519页

作者： Wang, Depeng Huang, Kailong He, Xiwei Zhang, Xu-Xiang Meng, Yabing School of Environmental Science and Engineering Sun Yat-sen University Guangzhou510275 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China Nanjing Jiangdao Institute of Environmental Research Co. Ltd. Nanjing210019 China

The simultaneous anammox and denitrification (SAD) system has received growing interest for the enhanced nitrogen removal, while the ecological traits of microbial community including spatial distribution characteristics, assembly processes and interspecies interactions have not been fully unraveled. The present study applied metagenomics and ecological analysis methods to gain the ecological traits of microbial communities in the SAD system across different organic substrate loadings. Results showed that organic matter significantly affected the bioreactor performance, and the optimal total nitrogen removal efficiency reached 93.4 ± 0.7% under the COD concentrations of 180 ± 18.2 mg/L. Functional organisms including Candidatus Brocadia (3.9%), Denitratisoma (1.6%), Dokdonella (4.4%) and Thauera (4.6%) obviously enriched under the optimal organic loading conditions. Moreover, microbial communities were significantly governed by deterministic process under high organic concentrations, and the denitrifying organisms displayed important ecological roles in the communities. Although anammox bacteria obviously enriched at the middle of bioreactor, it possessed the highest expression activities at both bottom and middle sites. Denitrifying bacteria that enriched at the bottom sites strongly achieved nitrate reduction and provided nitrite for anammox bacteria, while these organisms trended to compete nitrite with anammox bacteria at the middle site. These findings highlight the importance of microbial ecology in the SAD systems, which may expand our understanding of the synergistic patterns between anammox and denitrifying bacteria. © 2021 Elsevier B.V.

关键词： Denitrification

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Carbon flow allocation patterns of CH4, CO2, and biomass production vary with sewage and sediment microbial and biochemical factors in the anaerobic sewer environment

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Chemosphere 2024年 368卷 143744页

作者： Ye, Jianfeng Zhu, Yi Chen, Hao Nie, Yunhan Zhang, Jinxu Chen, Yu Guo, Yali Fang, Ning School of Environmental Science and Engineering Tongji University Shanghai200092 China State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai200092 China Science and Technology Innovation Center for Eco-environmental Protection Shanghai Investigation Design & Research Institute Co. Ltd. Shanghai200050 China YANGTZE Eco-Environment Engineering Research Center Three Gorges Corporation Beijing100038 China Co. Ltd. Shanghai200092 China

Understanding the carbon (C) fate in municipal sewers is imperative for optimizing current sewer-C-degradation control and treatment efficiency, aligning with China's C-neutrality strategy in determining the exact C budget of the wastewater system. This study used laboratory batch tests mimicking the anaerobic sewer environment and sewage-sediment stratification to evaluate C flow allocation (CFA) patterns in response to biotic and abiotic variables. We quantified the C equivalent mass (CEM) and used absolute quantitative 16S rRNA gene amplicon sequencing to characterize the microbiome. The substantial methane production (CH4, 17.2%–18.8%) required both activated sediment and exogenous C, while biomass production (BP, 63.1%–74.9%) formed C sink predominated as the main CFA direction under the stratified state. This was supported by the high diversity, interspecific interactions, and metabolic capacity of the sediment microbiome. However, CH4 and BP patterns demonstrated non-synchronicity and opposite dynamic characteristics. Carbon dioxide (CO2, 64.0%–81.3%) production dominated the sewage CFA. The absolute abundance of the sediment microbiome, which was 5.6 times higher than that of the sewage, exhibited a strong increase in magnitude across the phases. It was primarily associated with biomass growth and N metabolism, whereas sewage showed differentiated and competing communities and appeared to act mainly as the exogenous C sources. We constructed a binary quadratic linear model revealing the non-linear relationship between ACK activity, DOC degradation rate, and CEMCH4 rate;the former maintained low CH4 production when the available substrate was insufficient. The influence of N and S factors on the CFA is complex and multi-faceted. These findings highlight the importance of further investigations into the process-based framework of the sewer C budget, focusing on the C source-emission-sink functions and mass balance. © 2024 Elsevier Ltd

关键词： Carbon sequestration

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Efficacy and mechanism of 4-chloroaniline degradation in high-salt wastewater using membrane-aerated biofilm reactor

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Journal of Environmental Chemical Engineering 2025年第5期13卷

作者： Lehui Ren Yiwen Qiao Zhouyan Li Xueye Wang Zhichao Wu Zhiwei Wang State Key Laboratory of Pollution Control and Resource Reuse Advanced Membrane Technology Center of Tongji University Shanghai Institute of Pollution Control and Ecological Security School of Environmental Science and Engineering Tongji University Shanghai 200092 PR China

4-Chloroaniline (4-CA) is a toxic, carcinogenic and persistent aromatic amine, widely found in high-salt industrial wastewater. Its resistance to biodegradation and inhibition of microbial activity have brought great challenges to biological treatment. This study investigates the efficacy and mechanism of 4-CA degradation in high-salt industrial wastewater using a membrane-aerated biofilm reactor (MABR) system. Although the acclimation period of the high-salt MABR (HS-MABR) (day 85) was later than that of the control MABR (day 70), the HS-MABR achieved effective removal of 4-CA, with a removal efficiency reaching 99.5 % by day 120. Microbial community analysis revealed that HS-MABR was enriched with salt-tolerant microorganisms possessing pollutant degradation capabilities, including Lentimicrobium , Desulfobacterium , Flavobacterium , and Aequorivita . Metagenomic analysis combined with the analysis of degradation intermediate products identified two pathways for 4-CA degradation: aromatic ring cleavage and dehalogenation. Among them, the multicomponent phenol hydroxylase genes (dmpKLMNOP) were identified as the key genes associated with the aromatic ring cleavage pathway, while GST was recognized as the core regulatory gene involved in the glutathione (GSH)-dependent dehalogenation pathway. Overall, this study demonstrates that MABR is a promising technology for the treatment of high-salt wastewater containing refractory pollutants like 4-CA, providing insights into the microbial and genetic mechanisms underlying the biodegradation process.

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Inert Magnesium-Doped Co3o4 Spinel Assembling Catalytic Membrane for Instantaneous Peroxymonosulfate Activation and Contaminants Elimination

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SSRN 2023年

作者： Zhang, Xiao Liu, Shuya Wang, Zhongmin Feng, Kai Xu, Shengtao Li, Xi Yu, Peng Fan, Xiulei Zheng, Huaili Sun, Yongjun Jiangsu Key Laboratory of Industrial Pollution Control and Resource Reuse School of Environmental Engineering Xuzhou University of Technology Xuzhou221018 China School of Environmental Sciences and Engineering Nanjing Tech University Nanjing211816 China Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment State Ministry of Education Chongqing University Chongqing400045 China College of Urban Construction Nanjing Tech University Nanjing211816 China

The practical application of heterogeneous Fenton-like processes in wastewater treatment is hindered by poor catalyst recovery and limited mass transfer in traditional batch mode. Consequently, a catalytic membrane assembled with inert magnesium (Mg)-doped Co3O4 spinel (MCO) was fabricated to activate peroxymonosulfate (PMS) for organic contaminants elimination. The performance of this PMS activation was enhanced through the efficient induction of MCO surface electron polarization by electronegativity difference of Mg, which created abundant electron-rich Co centers. Notably, the stacked porous structure of the MCO layer enriched the reactants and exposed the reactive sites. Simultaneously, the confined spaces within the membrane enhanced mass transfer and constrained the reactive species to reach the probe molecules, thereby improving their availability. Therefore, the MCO@polyethersulfone (PES) membrane/PMS system instantly activated PMS, exhibiting an elimination kinetic constant of 0.039 ms–1 for tetracycline. The MCO@PES membrane demonstrated exceptional catalytic performance and stability in long-term operation studies. Mechanistic studies elucidated that the highly accessible SO4·-, ·OH, and 1O2 within the catalytic membrane enhanced the instant elimination of contaminants. Furthermore, the intermediate toxicity reduction in contaminants elimination was identified. This study presents a reference for applying transition metal spinel-based catalytic membranes in wastewater treatment. © 2023, The Authors. All rights reserved.

关键词： Mass transfer

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