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Nitrogen Removal from Dewatering Liquid of Landfill Sludge by a Two-Stage Anoxic/Oxic Membrane Bioreactor Via Partial Nitrification and Denitrification

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SSRN 2023年

作者： Ma, Zihang Lin, Lifeng Xi, Jiafu Gong, Xiaolu Wang, Jianqiao Peng, Peng An, Ying Cao, Jing Wu, Zhichao Zhou, Zhen Shanghai Engineering Research Center of Energy – Saving in Heat Exchange Systems College of Environmental and Chemical Engineering Shanghai University of Electric Power Shanghai200090 China Shanghai Municipal Engineering Design Institute Co. Ltd. Shanghai200092 China State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and Engineering Tongji University 1239 Siping Road Shanghai200092 China

Two pilot-scale two-stage anoxic/oxic membrane bioreactors were operated at different dissolved oxygen (DO) levels to evaluate the nitrogen removal performances for treating landfill sludge dewatering liquid (SDL) via partial nitrification (PN) and denitrification. Compared to the low DO system (2.0 – 3.0 mg/L), the high DO system (5.0 – 6.0 mg/L) exhibited efficient PN and denitrification, with high nitrite accumulation efficiency (98.5%) and nitrogen removal efficiency (98.0%). The high DO system removed nitrogen mainly via PN (53.8%) and simultaneous nitrification and denitrification (45.1%). Kinetic inhibition tests verified the optimal DO and pH at 5.0 mg/L and 8.5. Enriched nitrifying (Nitrosomonas) and denitrifying bacteria (Thiopseudomonas, Pseudomonas, and Truepera) in the high DO environment accomplished the nitrogen removal process. Metagenomic analysis showed that the high DO system enriched functional genes such as amoA/B/C, hao, and nirK/S, while the low DO system was unsuitable for PN of high ammonia nitrogen wastewater. © 2023, The Authors. All rights reserved.

关键词： Bioreactors

Promotion Effect of Foam Formation on the Degradation of Polyvinyl Alcohol by Ozone Microbubble

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SSRN 2023年

作者： Zhang, Liang Li, Pan Wang, Xuelin He, Xin Li, Enchao Lan, Qingquan Liu, Yanan Yin, Daqiang State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China Shandong Jianzhu University China Research Institute of Baoshan Iron and Steel Co China Nanjing Tianqi Advanced Oxidation Co. Ltd Nanjing210044 China School of Environmental Science and Engineering Donghua University 2999 North Renmin Road Shanghai201620 China

Polyvinyl alcohol (PVA) widely applied in various industries was difficult to degrade. Ozone (O3) combined with microbubble improving residence time and oxidation efficiency of O3, which provides a possibility of efficient degradation of PVA. In this study, PVA degradation by ozone microbubble (MB/O3) and oxygen microbubble (MB/O2) was investigated. The phenomenon that bubbles evolved into the not easily broken foam was observed for the first time. The PVA removal by MB/O3 and MB/O2 followed a first-order kinetic model, whose removal rate reached 98.58% and 48.68% in the first 20 minutes, respectively. The physicochemical reaction of PVA degradation by MB/O3 and the physical removal reaction by MB/O2 were demonstrated. The microscale changes of bubbles and foam were captured, revealing the observation of self-pressurizing dissolution of MB/O3 and the formation of larger foam by the remaining unbroken microbubbles, which eventually broke. A four-stage theory was proposed to explain PVA degradation by MB/O3, where physical separation, foam film degradation, and bubble coalescence within the foam play crucial roles. This process was demonstrated under different pH and salt concentration conditions, with a 33.2% increase in the COD removal rate when the pH was decreased from 8.69 to 3.30. Mechanism analysis further confirmed the four-stage theory, demonstrating that during the degradation of PVA, MB/O3 underwent a random cleavage process, resulting in small molecule residues containing aldehyde, carboxyl, and ester groups. The trial of MB/O3 was considered as a simple and efficient treatment method for PVA degradation compared with other PVA degradation processes. © 2023, The Authors. All rights reserved.

关键词： Ozone

High-Effective Degradation of Thiamphenicol with Ferrous/ Polyaniline Encapsulated in Molybdenum Disulfide Activate Peroxymonosulfate: Synergism of Iron and Molybdenum

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SSRN 2022年

作者： Liu, Guohui Wang, Qiongfang Zhang, Min Dong, Lei Rao, Pinhua Zhang, Xin Gao, Naiyun Deng, Jing College of Chemistry and Chemical Engineering Shanghai University of Engineering Science Shanghai201600 China State Key Laboratory of Pollution Control Reuse Tongji University Shanghai200092 China Co. LTD Shanghai200092 China College of Civil Engineering and Architecture Zhejiang University of Technology Hangzhou310014 China

Emerging antibiotics have raised severe challenges to remediation technologies for water treatment. Fe (II) displayed a great potential in peroxymonosulfate (PMS) activation to remove pollutants but was limited by the cycle of Fe (III))/Fe (II) in the process. This paper successfully coated MoS 2 on the surface of polyaniline (PANI) nanotubes, which could increase many activity sites to promote the cycle of Fe (III))/Fe (II) for sustainable activating PMS. Compared with Fe (II)/MoS 2 /PMS and Fe (II)/PMS systems, Fe (II)/MoS 2 @PANI/PMS system possessed a higher removal rate of thiamphenicol (TAP). 100% TAP was removed within 20 min under the neutral conditions with trace Fe (II) (2 μM) which was far lower than the allowable limit (0.3 mg/L) of iron in standard for drinking water by WHO. The degradation of TAP was effective in a broad solution pH range of 3.0 to 9.0. The results of radicals scavenging tests and electron paramagnetic resonance (EPR) implied the production of various reactive oxygen species (i.e., [[EQUATION]] , [[EQUATION]] , [[EQUATION]] and [[EQUATION]] ) for the degradation of TAP. The presence of [[EQUATION]] , [[EQUATION]] , [[EQUATION]] , [[EQUATION]] ， [[EQUATION]] and natural organic matter (NOM) inhibited the degradation of TAP. Based on high performance liquid chromatography with triple quadrupole mass spectroscopy (HPLC/TQMS), possible degradation paths of TAP were proposed. Overall, this study provided a novel strategy to remove antibiotics by overcoming the limiting cycle step of Fe (III)/Fe (II) in the peroxymonosulfate activation process, which had a great application in water treatment. © 2022, The Authors. All rights reserved.

关键词： Antibiotics

A Multi-Perspective Factorial-Analysis Based Non-Competitive Input-Output Model for Energy-Water Nexus in Kazakhstan

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SSRN 2022年

作者： Liu, Jintao Li, Yongping Huang, Guohe Wang, Shuguang Wang, Panpan China-Canada Center of Energy Environment and Sustainability Research UR-SDU School of Environmental Science and Engineering Shandong University Qingdao266237 China Faculty of Engineering and Applied Science University of Regina ReginaSKS4S 0A2 Canada Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Qingdao266237 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing100875 China

In-depth understanding of the energy-water nexus is necessary to promote the sustainability of energy and water systems. In this study, a multi-perspective factorial-analysis based non-competitive input-output model (MPF-NCIOM) is developed for analyzing energy-water nexus, which integrates non-competitive input-output model and factorial analysis from production-, betweenness-and consumption-based perspectives. MPF-NCIOM can not only provide a comprehensive identification of the key sectors in energy and water systems, but also explore the individual and interactive effects of multiple factors on the energy-water nexus from multi-policy perspectives. A case study of Kazakhstan that is one of the most water-scarce countries in Eurasia and is rich in oil and mineral resources is conducted to prove the applicability of the MPF-NCIOM. Major findings can be summarized: (i) Kazakhstan is a net importer of embodied energy and water under non-competitive imports assumption, where mining is the main exporter and manufacturing is the main importer;(ii) A significant amount of indirect energy and water is consumed in the process of sectoral transactions, accounting for 62% and 37.5% of direct energy and water consumption respectively;(iii) the coupling levels in all sectors are greater than the coordination levels;(iv) MIN, LMA, HMA, EGS and SER are identified as the key sectors affecting energy and water systems through multiple perspectives;(v) The optimal policies that determine whether the focus should be on production- or consumption-side policies for each sector are screened out to promote sustainable development of energy and water systems. These findings are helpful for providing decision support of integrated resource management for energy and water. © 2022, The Authors. All rights reserved.

关键词： Sustainable development

Assessment of the applicability of multi-satellite precipitation products on the Loess Plateau over the past four decades

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International Journal of Applied Earth Observation and Geoinformation 2025年 141卷

作者： Liu, Rui Yang, Liu Shi, Zhengguo Xing, Mengdao Academy of Advanced Interdisciplinary Research Xidian University Xi'an China State Key Laboratory of Pollution Control and Resources Reuse School of Environment Nanjing University Nanjing China State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi'an China

The study of drought and precipitation evolution due to global warming has garnered significant attention from the scientific community in recent years. The Loess Plateau (LP), a typical dryland agricultural area, has its agricultural development influenced by precipitation. However, given its location in the hinterland of the Eurasian continent, the complex terrain, and the severe lack of rain gauges, the region faces challenges in accurate precipitation measurement. Multi-satellite precipitation products (MPPs), with their wide coverage and high resolution, can potentially address this deficiency, making it crucial to assess their applicability on the LP. This study evaluates the results of the inversion of LP precipitation changes by MPPs, the factors influencing the precipitation changes, and the dynamical mechanisms affecting LP precipitation evolution. The findings indicate that the CPC is the most suitable product for inverting daily precipitation on the LP, with the highest correlation coefficient of 0.774 between CPC and observations, and the highest Probability of Detection of 0.667. This is attributed to the stable data sources and excellent algorithms used by CPC. Furthermore, the LP has exhibited a significant upward trend in precipitation since 2000, with the thermal term playing a significant role in the humidification of the LP. The analysis suggests that global warming increases atmospheric moisture content, and enhanced westerly jet and near-surface easterly anomalies transport warm, humid air from the North Atlantic and the eastern China Sea into the LP. Clarifying the precipitation trends and dynamics in the LP can provide valuable policy support for agricultural development. © 2025 The Author(s)

关键词： Attribution analysis Loess Plateau Performance evaluation Satellite precipitation products

Implications of Efflux Pumps Activation Caused by Mercury Contamination in Antibiotic Resistance and Pathogen's Virulence Under Ambient and Elevated Co2 Concentration

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SSRN 2022年

作者： Qiu, Linlin Wang, Yabo Du, Wenchao Ai, Fuxun Yin, Ying Guo, Hongyan State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Jiangsu Nanjing210023 China School of Environment Nanjing Normal University Nanjing210023 China Joint International Research Centre for Critical Zone Science University of Leeds and Nanjing University Nanjing University Nanjing210023 China

The occurrence and development of antibiotic resistance genes (ARGs) in pathogens poses serious threatens to global health. Agriculture soils provide reservoirs for pathogens and ARGs, closely related to public health and food safety. Especially, metals stress provides more long-standing selection pressure for ARGs, and climate change is a "threat multiplier" for the spread of ARGs. However, little is known about the impact of metals contamination on pathogens and ARGs in agricultural soils and their sensitivity to ongoing climate changes. To fill this gap, a pot experiment was conducted in open-top chambers to investigate the influence of mercury (Hg) contamination on the distribution of soil pathogens and ARGs under ambient and elevated CO2 concentration. Results showed that the relative abundance of common plant and human pathogens increased significantly in Hg-contaminated soil under two CO2 concentrations. Hg contamination was a positive effector of the activation of efflux pumps and offensive virulence factors (adhere and secretion system) under two CO2 levels. Activation of efflux pumps caused by Hg contamination might contribute to changes of virulence or fitness of certain pathogens. Overall, our study emphasizes the critical role of efflux pumps as an intersection of antibiotic resistance and pathogen’s virulence under Hg stress. © 2022, The Authors. All rights reserved.

关键词： Contamination

Reinvestigation of the Oxidation of Organic Contaminants by Fe(Vi): Kinetics and Effects of Water Matrix Constituents

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SSRN 2022年

作者： Wang, Shuchang Deng, Yang Shao, Binbin Zhu, Jiahui Guan, Xiaohong State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China Department of Earth and Environmental Studies Montclair State University MontclairNJ07043 United States Department of Environmental Science School of Ecological and Environmental Sciences East China Normal University Shanghai200241 China

The contributions of Fe(IV) and Fe(V) to the oxidation of trace organic contaminants (TrOCs) by Fe(VI) were mostly ignored in previous studies. For the first time, this study determined the real second-order rate constants (kreal) for the reactions between Fe(VI) and four kinds of TrOCs by blocking the contributions of Fe(IV)/Fe(V), and investigated the effects of coexisting HPO42-, Ca2+, Mg2+, NH4+, and humic acid (HA). It was found that Fe(VI) exhibited superior reactivity toward phenolic compounds. Different from other tested TrOCs, phenolic compounds were mainly degraded by Fe(VI) rather than Fe(IV)/Fe(V). Taking bisphenol A (BPA) as the target TrOC, it was found that the coexisting constituents can affect not only the reactivity of ferrates (i.e., Fe(IV), Fe(V), and Fe(VI)), but also the evolution profiles of ferrates. While HPO42- inhibited the reaction between Fe(VI) and H2O2, Ca2+, Mg2+, and NH4+ accelerated the TrOC degradation and promoted the generation of Fe(IV)/Fe(V) from Fe(VI). Besides, HA could increase the contribution of Fe(IV)/Fe(V) to the oxidation of BPA. These findings were validated in authentic water samples. Taken together, this study provides a new perspective regarding the true oxidation reactivity of Fe(VI), and thus urges reconsideration of how to harness high-valent Fe species in practices. © 2022, The Authors. All rights reserved.

关键词： Rate constants

Highly active N,O-doped hierarchical porous carbons for high-energy supercapacitors

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Chinese Chemical Letters 2020年第5期31卷 1226-1230页

作者： Ziyang Zhou Hui Duan Zhiwei Wang Yaokang Lv Wei Xiong Dazhang Zhu Liangchun Li Mingxian Liu Lihua Gan Shanghai Key Lab.of Chemical Assessment and Sustainability School of Chemical Science and EngineeringTongji UniversityShanghai 200092China State Key Laboratory of Pollution Control and Resources Reuse Shanghai Institute of Pollution Control and Ecological SecuritySchool of Environmental Science and EngineeringTongji UniversityShanghai 200092China College of Chemical Engineering Zhejiang University of TechnologyHangzhou 310014China School of Chemistry and Environmental Engineering Key Laboratory for Green Chemical Process(Ministry of Education)Hubei Key Lab.of Novel Reactor&Green Chemical TechnologyWuhan Institute of TechnologyZhengzhou 450001China College of Chemistry and Molecular Engineering Zhengzhou UniversityWuhan 430205China

Highly active N,O-doped hierarchical porous carbons(NOCs)are fabricated through the in-situ polymerization and pyrolysis of o-tolidine and ***-prepared NOCs have a variety of faradaic-active species(N-6,N-5 and O-I),high ion-accessible platform(1799 m^2/g)and hierarchically micro-meso-macro porous ***,the resultant NOC electrode delivers an advantageous specific capacitance(311 F/g),with a pseudocapacitive contribution of 37%in a threeelectrode configuration,and an enhanced energy output of 18.0 Wh/kg@350 W/kg owing to the enlarged faradaic effect in an aqueous redox-active ***,a competitive energy density(74.9 Wh/kg)and high-potential durability(87.8%)are achieved in an ionic liquid(EMIMB F4)-assembled *** study sheds light on a straightforward avenue to optimize the faradaic activity and nanoarchitecture for advanced supercapacitors.

关键词： N.O-doped carbon Hierarchical porous structure Faradaic activity Supcrcapacitor High energy density

Mechanistic Insights into the Generation and control of Cl-Dbps During Wastewater Sludge Chlorination Disinfection Process

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SSRN 2022年

作者： Zhang, Weijun Dong, Tianyi Ai, Jing Fu, Qinglong Zhang, Nan He, Hang Wang, Qilin Wang, Dongsheng Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science School of Environmental Studies China University of Geosciences Hubei Wuhan430074 China State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution Ministry of Ecology and Environment Hubei Wuhan430074 China Department of Environmental Engineering Zhejiang University Zhejiang Hangzhou310058 China The University of Sydney Australia

Chlorination disinfection has been widely used to kill the pathogenic microorganisms in wastewater sludge during the special Covid-19 period, but sludge chlorination might cause the generation of harmful disinfection byproducts (DBPs). In this work, the transformation of extracellular polymeric substance (EPS) and mechanisms of Cl- DBPs generation during sludge disinfection by sodium hypochlorite (NaClO) were investigated using multispectral analysis in combination with Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). The microorganism Escherichia coli ( E. coli ) was effectively inactivated by active chlorine generated from NaClO. However, a high diversity of Cl-DBPs were produced with the addition of NaClO into sludge, causing the increase of acute toxicity on Q67 luminous bacteria of chlorinated EPS. A variety of N-containing molecular formulas were produced after chlorination, but N-containing DBPs were not detected, which might be the indicative of the dissociation of -NH 2 groups after Cl-DBPs generated. Additionally, release of N-compounds production was increased in alkaline environment caused by SHC addition, resulted in more Cl-DBPs generation via nucleophilic substitutions. Whereas, less N-compounds and Cl-DBPs were detected after EPS chlorination under acidic environment, leading to lower cell cytotoxicity. Lignin and N-containing compounds in sludge were the major Cl-DBPs precursors, and acidic environment could control the release of N-compounds by eliminating the dissociation of functional groups in lignin derivatives, consequently reducing the generation and cytotoxicity of Cl-DBPs. This study highlights the importance to control the alkalinity of sludge to reduce Cl-DBPs generation prior to chlorination disinfection process, and ensure the safety of subsequential disposal for wastewater sludge. © 2022, The Authors. All rights reserved.

关键词： Chlorination