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SSRN 2024年

作者： Zhao, Zhenyu Chen, Yufan Zhou, Zhengwei Ye, Guojie Wu, Deli State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science & Engineering Tongji University Shanghai200092 China School of Environmental Science and Engineering Zhejiang Gongshang University Hangzhou310018 China Key Laboratory of Urban Water Supply Water Saving and Water Environment Governance in the Yangtze River Delta of Ministry of Water Resources Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Oxygenation of pyrite (Py) is known to mediate generation of reactive oxygen species (ROS) with these species capable of inducing contaminants degradation, whereas the possible participation of coexisting Fe(III) minerals in these processes is still unclear. This study finds that freshly formed ferrihydrite (Fh) significantly enhances the Py-mediated sulfamethoxazole (SMX) degradation process, while premixing Py and Fh in anoxic glovebox achieves an even higher SMX removal efficiency. Through the 56Fe isotope tracer experiment and a series of control experiments, Fh is found to be reduced by Py to form secondary solid-phase Fe(II) species (Fe(II)RF) which in turn facilitates ROS generation from O2 activation. In the meanwhile, rapid structural transformation of Fh was observed within 1 hours to form more thermodynamically stable goethite and hematite with these less redox active minerals unable to sustainably promote the Py-mediated SMX degradation process. Therefore, the improvement of Fh on Py-mediated SMX degradation process slow down to a halt after several hours. In comparison, continuing input of Fh increased the degradation efficiency of SMX by 60% over three days. Our results demonstrate that the oxidative degradation of organic contaminants over the oxygenation of Py when coexisting with Fh can be more significant but currently underestimated. environmental implication: This study reveals that the co-existing ferrihydrite significantly enhances the pyrite-mediated organic contaminant degradation under oxic conditions. Ferrihydrite is found to be reduced by pyrite to form secondary solid-phase Fe(II) species (Fe(II)RF) which in turn facilitates ROS generation from O2 activation. Given that ferrihydrite is the most prevalent mineralogical form of iron in natural environments and its occurrence often overlaps with pyrite under aerobic conditions, this study suggest that pyrite may exhibit more intricate environmental behavior within real water matrix, and pote

关键词： Pyrites

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Constructing Highly Active Metal Oxides for Toluene Degradation by Fenton Iron Mud Modulation

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SSRN 2022年

作者： Chong, Yanan Li, Yifei Lin, Jiajin Chen, Tingyu Zhao, Shuaiqi Wu, Peng Li, Anqi Feng, Chunhua Qiu, Yongcai Ye, Daiqi School of Environment and Energy State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control South China University of Technology Guangdong Guangzhou510000 China The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of Education School of Environment and Energy South China University of Technology Guangzhou510006 China

Fenton iron mud (IM) is a hazardous solid waste produced by Fenton oxidation technology after treating industrial wastewater. Thus, it is necessary and challenging to develop a recycling technology to back-convert the dangerous materials into useful products. Herein, we develop a sustainable approach to prepare highly active metal oxides via a solid-state grinding method. IM as an amorphous material could disperse and interact well with these metal oxides, boosting the toluene degradation significantly. Among these IM-based catalysts, the catalyst of 8% MnOx/IM-0.2VC exhibits the best performance, originating from the oxides-support interaction and optimal balance between the valence state of active metal and oxygen vacancy concentration. In addition, in-situ DRIFTS result expounds that the ring-breakage is prone to occurring on MnOx, and oxygen vacancies could activate oxygen species to boost toluene oxidation. This work advances a complete industrial hazardous waste recycling route to develop extremely active catalysts. © 2022, The Authors. All rights reserved.

关键词： Catalysts

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Mitigating China's Prefecture-Level Economic Risk of Water Scarcity: The Role of Water Conservation and Carbon Neutrality Policies

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SSRN 2024年

作者： Jiang, Feng Wang, Saige Chen, Bin Wang, Hao Duan, Cuncun State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing100875 China Faculty of Geographical Science Beijing Normal University Beijing100875 China Faculty of Architecture Civil and Transportation Engineering Beijing University of Technology Beijing100124 China College of Water Sciences Beijing Normal University Beijing100875 China

Inadequate water quantity and substandard water quality exacerbates China’s water scarcity, posing significant economic risks. However, the impact of policies on water scarcity risks (WSR) remains unexplored. This study integrated WSR assessment with policy scenarios related to water conservation and carbon neutrality. Firstly, we developed a 2017 inventory of quantity-based and quality-based water consumption for China's 304 prefectures. Then, using multi-regional input-output analysis, we assessed local WSR and transboundary flows across prefectures. Thirdly, we formulated four scenarios for China's water conservation and carbon neutrality policies in 2030 and 2060, exploring their potential effects on WSR mitigation. The results showed that China's total quantity-based and quality-based WSR accounted for 8.0% of GDP in 2017. By 2060, 89% of prefectures' WSR would be alleviated due to water-saving measures and low-carbon transition, though 11% of prefectures might experience offsetting effects. These findings offer valuable insights for water resources management in addressing economic risks. © 2024, The Authors. All rights reserved.

关键词： Water conservation

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A two-stage robust decision-making framework (2S-RDM) for flood risk adaptation under deep uncertainty

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Fundamental Research 2024年

作者： Cai, Jiacong Wei, Yiding Yang, Jianxun Ji, Chenyi Liu, Miaomiao Fang, Wen Ma, Zongwei Bi, Jun State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210044 China Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET) Nanjing University of Information Science & Technology Nanjing 210044 China

Flood is one of the major challenges facing human societies. Adapting to future flood risks involves deep uncertainty, especially when long-term projections of climate change are considered. This study proposed a Two-stage Robust Decision Making (2S-RDM) framework to help devise flexible and robust strategies capable of addressing the inherent deep uncertainty associated with managing flood risks. Taking the Yangtze River Basin in China as a case study, we simulated flood risks across ∼0.6 million scenarios until 2050. This analysis considered four types of uncertain factors, i.e., future climate change, socio-economic growth, industrial structure transformation, and population aging. We then examined the effectiveness of four adaptation measures and their combinations, i.e. building elevation, tunnel construction, people relocation, and river basin conservation. Our projections show that without immediate adaptation, an estimated 0.9 to 27.3 million people will be impacted by floods until 2050, accompanied with $33.8 to $198.5 billion economic losses in the entire basin. When defining the goal as limiting the affected population <0.05% and ensuring economic losses <0.02%, we identified 24 global robust strategies capable of meeting this criterion in >80% of scenarios. Then, we compared the 24 global robust strategies regarding their relative costs and performances in each of the future scenario pools. The final recommended solutions are hybrid strategies that integrate engineering-based measures with ‘soft’ adaptation options (e.g. Elevation++, Tunnel++, and Relocation). This study provides tools to design flood adaptation strategies not only robust across diverse scenarios but also flexible for decision-makers to customize and refine their strategies based on specific needs. © 2024

关键词： Deep uncertainty Flood risk adaptation Robust decision-making Scenario analysis

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Effects of biochar on soil water retention curves of compacted clay during wetting and drying

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Biochar 2022年第1期4卷 1117-1130页

作者： James Tsz Fung Wong Ka Lai Chow Xun Wen Chen Charles Wang Wai Ng Ming Hung Wong Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongSARChina Department of Geography Hong Kong Baptist UniversityKowloon TongHong KongSARChina Consortium on Health EnvironmentEducation and Research(CHEER)Department of Science and Environmental StudiesThe Education University of Hong KongTai PoHong KongSARChina Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China State Environmental Protection Key Laboratory of Integrated Surface Water Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China

Compacted clay possesses a low water permeability and has been widely used in geo-environmental facilities such as landfill cover *** studies revealed the potential applications of compacted biochar-amended clay(BAC)as an alternative landfill cover ***,the effects of biochar on the soil water retention curves(SWRCs)of clay at low suction are not *** study can help fill this knowledge gap by measuring the wetting and drying SWRCs of clay and BAC(20%biochar).Soils were compacted in instrumented soil columns and subjected to a wetting and drying cycle,and soil water content and suction were measured along with the soil *** was saturated faster when compared with *** drying,the soil water content of clay at 65 mm depth dropped to almost zero,while about 5%of water was retained in *** showed that biochar increased the soil water retention capacity of compacted clay upon *** showed that biochar-clay composite possesses a higher soil water retention capacity at a low soil suction range(<1000 kPa)compared with clay *** revealed the benefits of using compacted biochar-clay composite as a hydraulic barrier to minimize desiccation-induced cracks and potentially promote its serviceability,especially in arid and semi-arid *** composite is also a carbon sink material that can reduce landfill gas emissions and pollutant leaching.

关键词： Soil amendment Biochar-clay composite Soil carbon Soil suction Soil depth

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Peroxymonosulfate activation for preferential generation of hydroxyl radical with atomic Mn anchored TiO 2 in photoelectrochemical process

Environmental Functional Materials

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environmental Functional Materials 2023年第1期2卷 13-24页

作者： Min Chen Jinxing Zhang Tian Yang Shun Mao Hongying Zhao Shanghai Key Lab of Chemical Assessment and Sustainability Key Laboratory of Yangtze River Water Environment School of Chemical Science and Engineering Tongji University 1239 Siping Road Shanghai 200092 PR China College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource Reuse Tongji University 1239 Siping Road Shanghai 200092 PR China

The threaten of ubiquitous antibiotics to human and ecosystem makes it urgent to seek efficient treatment technologies. Peroxymonosulfate (PMS)-based advanced oxidation processes have revealed wide prospects for wastewater treatment via controllable PMS activation for desired ROS generation. Herein, a novel TiO 2 photoelectrode decorated with atomically distributed Mn (SA-MnTiO 2 ) was designed via a modified molten salt method (MSM) for photo-electro-catalytic (PEC) activation of PMS. The electron transfer in reduction-/oxidation-state Mn(II)/Mn(III)/Mn(IV) cycles facilitated the cleavage of intramolecular O–O bonds in PMS to preferentially generate hydroxyl radical (HO•). Almost complete degradation of norfloxacin (NOR) was occurred with optimal SA-Mn 0.6 TiO 2 within 15 min, exhibiting high turnover frequency (0.066 min −1 ). Around 74.8% of total organic carbon was eliminated with a low specific energy consumption of 0.94 kW h/g. The key operational parameters during actual wastewater treatment were inspected for SA-Mn 0.6 TiO 2 /PMS system, suggesting the satisfactory stability for practical applications.

关键词： Peroxymonosulfate Hydroxyl radical Antibiotic Advanced oxidation processes Photoelectrochemical process

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Alumina inhibits pyrite oxidative dissolution by regulating solid film passivation layer and S, Fe, and Al speciation transformation

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Chemosphere 2024年 352卷 141366页

作者： Liu, Guo Tang, Jie Li, Bo Chen, cheng Wang, Xuemei State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation & Water Pollution College of Ecology and Environment Chengdu University of Technology Chengdu 610059 China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Chengdu 610059 China Southwest University of Science and Technology School of Environment and Resourse Mianyang 621010 China

The oxidation of pyrite results in the formation of a solid film passivation layer on its surface. This layer effectively hinders the direct interaction between H2O, O2, and the pyrite surface, thereby impeding the ox... 详细信息

The oxidation of pyrite results in the formation of a solid film passivation layer on its surface. This layer effectively hinders the direct interaction between H₂O, O₂, and the pyrite surface, thereby impeding the oxidation dissolution of pyrite. There are few studies on whether alumina (Al₂O₃), a common aluminum-containing oxide, affects the formation of a solid film passivation layer on the surface of pyrite and inhibits the oxidation dissolution of pyrite. This research investigates the impact of Al₂O₃ incorporation on the speciation transformation of S, Fe, and Al on the surface of pyrite during oxygen pyrite process. The oxidation of pyrite followed the “polysulfide-thiosulfate” complex oxidation pathway. When <1.5 g/L Al₂O₃ was introduced, it increase pyrite oxidation, whereas ≥1.5 g/L Al₂O₃ prevented pyrite oxidation. The process of Al₂O₃ dissolution results in the consumption of H⁺ and the subsequent release of Al³⁺. This, in turn, facilitates the hydrolysis of Fe³⁺ and Al³⁺ to generate a secondary mineral layer on the pyrite surface. As a result of the accumulation of S promotes the formation of polysulfide chemical (FeS_n) or iron deficiency sulfide (Fe_1-xS), resulting in the formation of a solid film passivation layer composed of sulfur film and secondary mineral layer. The results demonstrated that Al₂O₃ can promote the formation of a solid film passivation layer on the surface of pyrite, which has significant implications for controlling the oxidation dissolution process of pyrite and offers a new perspective for the source control of acid mine drainage. © 2024

关键词： Alumina Oxidative dissolution Pyrite Solid film passivation layer Speciation transformation

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Realizing stable operation of anaerobic ammonia oxidation at low temperatures treating low strength synthetic wastewater

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Journal of environmental Sciences 2019年第1期31卷 193-200页

作者： Bowen Zhang Jian Zhao Jiane Zuo Xuchuan Shi Jiayi Gong Haiteng Ren State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing Enterprises Water Group Limited SUEZ NWS Company Limited

The low activity of Anammox bacteria at low temperatures and competition from nitrite oxidation bacteria(NOB) when treating low strength wastewater have been major bottlenecks in implementing Anammox in mainstream wastewater treatment. By intermittent high strength feeding(IHSF) and stepwise temperature reduction, stable operation of a granular Anammox reactor was realized at low temperatures(down to 15°C) for 28 days when treating low strength synthetic wastewater. The nitrogen loading rate reached 1.23–1.34 kgN/m^3/day,and the total nitrogen removal rate reached 0.71–0.98 kgN/m^3/day. The IHSF enriched the Anammox sludge in high strength cycles and compensated for sludge loss in low strength cycles, and the high concentration of ammonium in high strength cycles inhibited NOB. The 16 SrRNA gene sequencing results revealed that Candidatus Kuenenia was predominant in the reactor at low temperatures.

关键词： Biological nitrogen removal Low temperature Granular Anammox SBR Microbial community

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Efficient Adsorption Removal of Carbamazepine from Water By Dual-Activator Modified Hydrochar

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SSRN 2024年

作者： Zhong, Hua Zhu, Guangju Wang, Zhuozhuo Liu, Xiaochang Zhang, Hua Qiu, Yanling Yin, Daqiang Zhu, Zhiliang State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai200092 China Key Laboratory of Yangtze River Water Environment Ministry of Education of China Tongji University Shanghai200092 China School of Urban and Regional Science Shanghai University of Finance and Economics 777 Guoding Road Shanghai China

The decontamination of trace micropollutants from water environments is a widely concerned issue, and developing green and efficient adsorbent serves as an effective solution. In this study, using dual-activator modification method, an efficient hydrochar adsorbent was prepared through a two-step sequential process combining H3PO4 hydrothermal treatment with K2CO3 pyrolysis activation for carbamazepine (CBZ) adsorption removal. The results indicated that H3PO4 facilitated the K2CO3 activation process. The prepared hydrochar exhibited excellent adsorption properties due to its high specific surface area (1265.08 m2·g-1) and aromatic porous mesh structure, with the maximum and dynamic adsorption capacities for CBZ of 376.11 and 296.98 mg·g-1, respectively. The adsorption mechanism primarily involved pore-filling effects, π-π EDA interactions and hydrophobic interactions. Additionally, the obtained hydrochar material showed high adsorption efficiency for various pollutants and performed well in actual water samples. This study may provide theoretical and technical support for the development and application of high-efficiency hydrochar-based adsorbents. © 2024, The Authors. All rights reserved.

关键词： Adsorption

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Constructing Highly Active Metal Oxides for Toluene Degradation by Fenton Iron Mud Modulation

SSRN

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SSRN 2022年

Fenton iron mud (IM) is a hazardous solid waste produced by Fenton oxidation technology after treating industrial wastewater. Thus, it is necessary and challenging to develop a recycling technology to back-convert the dangerous materials into useful products. Herein, we develop a sustainable approach to prepare highly active metal oxides via a solid-state grinding method. IM as an amorphous material can disperse and interact well with these supported metal oxides, boosting the toluene degradation significantly. Among these IM-based catalysts, the catalyst of 8% MnOx/IM-0.2VC exhibits the best performance, originating from the oxides-support interaction and optimal balance between low-temperature reducibility and oxygen vacancy concentration. In addition, in-situ DRIFTS result expounds that the ring-breakage is prone to occurring on MnOx, and oxygen vacancy is beneficial to adsorb oxygen and activate oxygen species to boost toluene oxidation following Mars-van Krevelen mechanism. This work advances a complete industrial hazardous waste recycling route to develop extremely active catalysts. © 2022, The Authors. All rights reserved.

关键词： Temperature

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