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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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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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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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Removal of Cl(-I) from Zinc Sulfate Electrolyte by the Porous Bi2o3 Rich in Ovs: Under the Function of Porous Surface Promoting Reagent Dissolution Coupling with Ovs Adsorbing Pollutants

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SSRN 2023年

作者： Li, Dong Lu, Dongjie Liu, Jinyu Kong, Linghao Hu, Xingyun Wan, Lei Dou, Wenyue Jiangsu Key Laboratory of Industrial Pollution Control and Resource Reuse School of Environmental Engineering Xuzhou University of Technology Xuzhou221018 China Xuzhou Vocational College of Bioengineering Xuzhou221006 China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China Beijing Key Laboratory of Industrial Wastewater Treatment and Resource Recovery Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China

During the zinc electrolysis, the concentration of Cl(-I) impurity in the zinc sulfate electrolyte needs to be controlled below 100 mg/L. In the promising approach for Cl(-I) removal from the zinc sulfate electrolyte by bismuth oxide (Bi2O3), the low efficiency and high reagent dosage, arising from the limited solubility of Bi2O3, are the major technical bottleneck to be solved. In this study, an improved approach for the removal of Cl(-I) from zinc sulfate electrolyte by the porous Bi2O3 rich in oxygen vacancies (OVs) was explored. For the common zinc sulfate electrolyte, a high efficiency above 90% was always obtained under the stoichiometric mole ratio of reagent to Cl(-I) under room temperature, when the Bi2O3 being irradiated for 300 min under ultraviolet (UV) was utilized. 98.9% of the employed Bi2O3 was regenerated after the treatment using sodium hydroxide (NaOH) solution, and thus, Cl(-I) was finally transferred from the zinc sulfate electrolyte to the concentrate. Thanks to the improved Bi2O3 dissolution caused by the porous surface and the adsorption of Cl(-I) on OVs, the transformation process of inner Bi2O3 to BiOCl can be effectively improved, leading to the significant enhancement in Cl(-I) removal efficiency and decrease in reagent dosage. © 2023, The Authors. All rights reserved.

关键词： Bismuth compounds

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The Removal of Cl− from Acidic Wastewater by Cu2+/Vc: Through Reduction & Precipitation Function

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SSRN 2023年

作者： Dou, Wenyue Li, Dong Zou, Xiaoyi Wang, Zihan Song, Yifei Kong, Linghao Hu, Xingyun Jiangsu Key Laboratory of Industrial Pollution Control and Resource Reuse School of Environmental Engineering Xuzhou University of Technology Xuzhou221018 China Xuzhou Vocational College of Bioengineering Xuzhou221006 China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China Beijing Key Laboratory of Industrial Wastewater Treatment and Resource Recovery Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China

Nowadays, recycling as the material for industrial sulfuric acid (H2SO4) has become the development trend for the treatment of the acidic wastewater containing H2SO4. To ensure the quality of the recycled H2SO4, the impurities need to be pre-removed, among which chloride ion (Cl−) is still a big issue. In our previous studies, several methods for the removal of Cl− were proposed, however, a limitation of the requirement for the high concentration of H2SO4 remains to be solved. In this work, an approach for the removal of Cl− by copper ion (Cu2+) and ascorbic acid (VC) from the wastewater containing low concentration of H2SO4 was systematically studied. The removal efficiency of Cl−, the mechanism and the application to the actual wastewater were successively explored. For the wastewater with the H2SO4 concentration below 15 g/L, a Cl− removal efficiency above 90% was always obtained at the mole ratio of Cu2+, VC and Cl− of 3.5:0.75:1 under room temperature. During the removal of Cl−, Cu2+ was firstly reduced by VC to produce cuprous ion (Cu+), which precipitated with Cl− rapidly, leading to the effective removal of Cl− in the form of cuprous chloride (CuCl). © 2023, The Authors. All rights reserved.

关键词： Ascorbic acid

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Comprehensive insights into the organic/inorganic composition separation of sewer sediment by various driving forces: separation pathway and thermodynamic evolution

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Journal of Environmental Sciences 2025年

作者： Heliang Pang Jiangbo Ding Yan Wang Jiawei Liu Qiwen Qin Jinsuo Lu Shaanxi Key Laboratory of Environmental Engineering School of Environmental and Municipal Engineering Xi'an University of Architecture and Technology Xi'an 710055 China State Key Laboratory of Pollution Control and Resource Reuse Shanghai 200092 China

With the legislative development, the organic and inorganic composition separation has become the primary requirement for sewer sediment disposal, however the relevant technology has been rarely reported and the driving mechanism was still unclear. In this study, direct disintegration of biopolymers and indirect broken of connection point were investigated on the hydrolysis and component separation. Three typical sewer sediment treatment approaches, i.e., alkaline, thermal and cation exchange treatments were proposed, which represented the hydrolysis-driving forces of chemical hydrolysis, physical hydrolysis and innovative cation bridging breakage. The results showed that the organic and inorganic separation rates of sewer sediment driven by alkaline, thermal and cation exchange treatments reached 21.26 %, 23.80 %, and 19.56 %-48.0 %, respectively, compared to 4.43 % in control. The secondary structure of proteins was disrupted, transitioning from α-helix to β-turn and random coil. Meanwhile, much biopolymers were released from solid to the liquid phase. From thermodynamic perspective, sewer sediment deposition was controlled by short-range interfacial interactions described by extended Derjaguin-Landau-Verwey-Overbeek theory. Additionally, the separation of organic and inorganic components was positively correlated with the thermodynamic parameters (Corr = 0.87), highlighted the robustness of various driving forces. And the flocculation energy barriers were 2.40 (alkaline), 1.60 times (thermal), and 4.02-4.97 times (cation exchange) compared to control group. The findings revealed the contrition difference of direct disintegration of gelatinous biopolymers and indirect breakage of composition connection sites in sediment composition separation, filling the critical gaps in understanding the specific mechanisms of sediment biopolymer disintegration and intermolecular connection breakage.

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Enhanced Capacitive Deionization Properties of Activated Carbon Doped with Carbon Nanotube-Bridged Molybdenum Disulfide

SSRN

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SSRN 2022年

作者： Sun, Jing Song, Haiou Li, Yun Li, Hongxiang Lai, Qian Egabaierdi, Gusunkiz Li, Qimeng Zhang, Shupeng He, Huan Li, Aimin School of the Environment Nanjing Normal University Nanjing210023 China School of Chemical Engineering Nanjing University of Science and Technology Nanjing210094 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

The shortage of freshwater supplies has restricted societal development. Capacitive deionization (CDI) is an emerging technology for desalination of seawater or brackish water, the performance of which is highly dependent on electrode materials. In this work, a molybdenum disulfide/carbon nanotube composite (CNTs-b-MoS 2 ) with high capacitance was successfully synthesized using a hydrothermal method. The composite exhibited a specific capacitance of 112.79 F/g. To reduce costs and determine the practicality of using CNTs-b-MoS 2 for CDI, we combined activated carbon (AC) with CNTs-b-MoS 2 as a CDI electrode. The research demonstrated that after doping with 5% (mass ratio) CNTs-b-MoS 2 , the specific capacitance and electrosorption capacity of AC were significantly improved and the maximum desalination capacity of CNTs-b-MoS 2 /AC reached 8.19 mg/g. The low dosage of CNTs-b-MoS 2 combined with the high specific surface area of AC avoided the shortcomings of CNTs-b-MoS 2 , namely low specific surface area and high cost. Moreover, the outstanding conductivity of CNTs-b-MoS 2 improved the conductivity and enhanced the adsorption capacity of AC, giving CNTs-b-MoS 2 /AC potential as an advanced, low cost CDI electrode material. © 2022, The Authors. All rights reserved.

关键词： Activated carbon

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Cn Species on Tio2 Enable the Increased Performance and Stability of Photocatalytic Toluene Oxidation: Interstitial N Doping and the Mechanism Study

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SSRN 2022年

作者： Wan, Haiqin Li, Nan Shi, Bingqing Qian, Qiuhui Zou, Weixin Tong, Qing Cai, Yandi Dong, Lin State Key Laboratory of Pollution Control and Resource Reuse School of the Environmental Nanjing University Nanjing210023 China Jiangsu Key Laboratory of Vehicle Emissions Control Center of Modern Analysis Nanjing University Nanjing210093 China National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology School of Environmental Science and Engineering Suzhou University of Science and Technology Suzhou215009 China

The photocatalyst stability and pollutant mineralization are important to the toluene degradation. Herein, CN species were used to modify TiO2, denoted as UTx (x=0.5, 1, 2), and the UT1 had the best deep oxidation of photocatalytic toluene. The interfacial interactions and reaction mechanisms were explored, respectively. DFT calculations showed that interstitial N dopant, not substitutional N, was easier to form, leading to isolated states lying in the gap and more negative VBM, and thus kinetically and thermodynamically generated hydroxyl radicals. Furthermore, other C≡N species on UT1 acted as faster electron transfer layers and ring-opening sites to toluene mineralization. In situ DRIFTS, GC-MS, and the comparison of fresh and used photocatalysts suggested that the quinone intermediate was observed on UT1 to open rings to 3-hydroxyglutaric dialdehyde intermediate, which further deeply oxidized to CO2 for its enhanced mineralization. Though pure TiO2 had better toluene adsorption, most intermediates of benzaldehyde accumulation on surface led to its poorer stability. The pathway of toluene degradation was proposed. © 2022, The Authors. All rights reserved.

关键词： Titanium dioxide

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Performance and Mechanism of a Transmembrane Electro-Chemisorption System with On-Site Utilization of Authigenic Acid and Base to Enhance Ammonia Recovery from Wastewater

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SSRN 2024年

作者： Cao, Zhiyong Zhang, Jiao Deng, Ruifeng Wang, Zuobing Zhang, Zhiqiang Deng, Beiqi Zhang, Nan Zhang, Qingbo Wei, Guangfeng Liu, Xinchao Xia, Siqing State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Urban Water Supply Water Saving and Water Environment Governance in the Yangtze River Delta of Ministry of Water Resources College of Environmental Science and Engineering Tongji University Shanghai200092 China Key Laboratory of Yangtze River Water Environment Ministry of Education Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China School of Municipal and Ecological Engineering Shanghai Urban Construction Vocational College Shanghai200432 China Huadian Electric Power Research Institute Co. Ltd Hangzhou310030 China National Engineering Research Center of Dredging Technology and Equipment 17 Shanghai200082 China Shanghai Key Laboratory of Chemical Assessment and Sustainability School of Chemical Science and Engineering Tongji University Shanghai200092 China Co. Ltd Shanghai200092 China

The electrochemical processes combined with transmembrane chemisorption (TMCS) represents a sustainable way for ammonia recovery from wastewater. However, poor utilization of acid and base produced by the combined systems has become a bottleneck for its development and application. In this study, a transmembrane electro-chemisorption (TMECS) system was developed via directly connecting anode chamber and cathode chamber with a hydrophobic gas permeable membrane (GPM). The special structure of "anode-GPM-cathode" was found to promote the TMCS of ammonia via the combined action of forming localized extreme pH layers at two sides of GPM, and electrical field forces between electrodes and NH4+. Increasing applied voltage and salt concentration could enhance ammonia recovery by promoting water splitting and reducing reactor internal resistance, respectively. The system showed wide applicability of the influent NH4+-N concentration (560-5000 mg/L). For a high influent NH4+-N concentration (5000 mg/L), a specific energy consumption of 21.8 kWh/kg N could be reached, which was lower than those of traditional ammonia recovery and total of production and removal of ammonia. Besides saving chemicals and producing hydrogen, the energy consumption is anticipated to be reduced sharply by stacking the TMECS units. Therefore, the system showed its good prospects in saving chemicals, wide applicability and scale-up potential for ammonia recovery from wastewater. © 2024, The Authors. All rights reserved.

关键词： Chemisorption

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A Soft Sensor for Simulating Algal Cell Density Based on Dynamic Response to Environmental Changes in a Eutrophic Shallow Lake

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SSRN 2022年

作者： Rao, Wenxin Qian, Xin Fan, Yifan Liu, Tong State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China Nanjing University of Information Science & Technology Nanjing210044 China Faculty of Environmental Earth Science Hokkaido University Sapporo060-0810 Japan

Eutrophic shallow lakes universally suffer from algal blooms. The management and control of these blooms require real-time monitoring of the changes to water quality that favor algal growth. While algal cell density (ACD) is a critical indicator of algal growth, surveys of ACD are both laborious and time-consuming, such that confirmation of bloom-promoting conditions in eutrophic shallow lakes is often not possible. To address the limitations of conventional ACD detection, we examined a soft sensor approach in which ACD was simulated using surrogate indicators in machine learning models. As the quality of the indicators selected as input variables can significantly influence model performance, we conducted a case study using monitoring data from Chaohu Lake collected between 2016 and 2019 to select the best combination of machine learning algorithm and indicator variables. The results showed that ensemble learning models, especially extreme gradient boosting (XGBoost), outperformed traditional machine learning algorithms. After multiple rounds of the variable importance analysis, 7 key environmental variables out of the 43 initial candidate variables were selected. Their inclusion substantially improved data accessibility and supported the development of a rapid simulation model. The final model was capable of reliable spatiotemporal extrapolation, with an overall R2 value of 0.761. Our approach allowing a rapid simulation of the changes in ACD can facilitate the early detection of bloom conditions and allow timely implementation of measures to reduce the economic costs and health risks associated with algal blooms. © 2022, The Authors. All rights reserved.

关键词： Water quality

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