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Investigation on removing recalcitrant toxic organic polluters in coking wastewater by forward osmosis

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Chinese Journal of Chemical Engineering 2020年第1期28卷 122-135页

作者： Zhiqiang Li Lanying Jiang Chongjian Tang School of Metallurgy and Environment Central South UniversityChangsha 410000China National Engineering Research Center for Control&Treatment of Heavy Metal Pollution Changsha 410000China Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety Changsha 410000China

Investigation was made on the efficiency of two commercial membranes in removing via forward osmosis(FO)the low molecular weight organic compounds typical of coking wastewater. The membranes were supplied by Poten and HTI companies. The organics in the simulated coking water were indole and pyrridine. Under FO mode, the rejection to the organics by Poten membrane was around 50%, whereas that for HTI membrane was obviously higher, ranging from 65% to 74%. The response of the two membranes in terms of Water flux and reverse salt flux(RSF) towards changing feed/draw solution(DS) flow rates in FO mode showed similar tendency,but different degree. Generally, the flux in FO using HTI membranes was lower. For HTI membrane, FO operated with pressure retarded osmosis(PRO) mode was also performed and the overall rejection of the organics was slightly lower than that in FO mode. In the long term FO test within 15 days, both Poten and HTI membranes displayed flux reduction and rejection enhancement. But the variation with Poten membrane was much more obvious. Discussion was carried out about the reasons and the mechanisms behind the FO performance difference between two membranes and the variation in flux and rejection with operation conditions. Characterizations by SEM, FTIR, AFM, XRD and XPS were tried to support the proposed explanations.

关键词： Coke wastewater Organics rejection Forward osmosis Water flux Reverse salt flux

Mechanisms of Well Iron Clogging in Groundwater Heat Pump Systems: Insights from Video Imaging, Hydro-Geo-Chemical Analysis, and Geochemical Modeling

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SSRN 2024年

作者： Shi, Min Yang, Yuesuo Wu, Yuhui Wang, Qiandan Gao, Lei Lu, Ying Key Laboratory of Groundwater Resources and Environment Jilin University Ministry of Education Changchun130021 China Jilin Provincial Key Laboratory of Water Resources and Environment Jilin University Changchun130021 China Guangdong Engineering Technology Research Center of Heavy Metal Pollution Control and Restoration in Farmland Soil South China Institute of Environmental Sciences MEE Guangzhou510535 China Waite Campus UrrbraeSA5064 Australia

Groundwater heat pump (GWHP) systems are increasingly popular as low-carbon and environmentally friendly technologies, but well clogging induced by iron remains a significant issue. This study investigated the clogging characteristics and biogeochemistry of three typical wells (pumping, injection, and observation wells) in an operating GWHP system using video imaging, sampling, and analysis of hydro-geo-chemical and microbial data. The results revealed that iron-induced well clogging is a complex process involving physical, chemical, and microbial factors. Pumping wells experience clogging due to water mixing with varying redox conditions, resulting in hematite-based iron oxide deposits. Injection wells exhibit higher clogging severity, with transformed oxidation and accumulation of reduced iron minerals at the solid-liquid interface, resulting in darker colored clogs with magnetite. Clogging in both extraction and injection wells is closely related to iron-rich aquifer sections, where severe clogging occurs. Shallow clogging due to iron oxide is limited and attributed to the oxidation of zero-valent iron in well casing material. Iron-oxidizing bacteria and iron-reducing bacteria were detected in the consolidated deposits of clogged wells, indicating their involvement in the clogging formation process. Moreover, a strong correlation was observed between the presence of nitrate-reducing bacteria in the water phase and the severity of clogging, suggesting a possible link between iron oxidation and nitrate reduction in the system. Geochemical modeling results further supported the observed clogging severity in GWHP systems and confirmed varying clogging mechanisms in different wells and depths. These findings contribute to the understanding of clogging in GWHP operations, aiding in robust water utilization and energy-saving efforts, and supporting global carbon reduction initiatives. © 2024, The Authors. All rights reserved.

关键词： Biogeochemistry

heavy metals and Nutrients Mediate the Distribution of Microbial Community in a Typical Contaminated Farmland of South China

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SSRN 2024年

作者： Zhang, Feng Xie, Yunhe Peng, Rui Ji, Xionghui Hunan Institute of Agro-Environment and Ecology Hunan Academy of Agricultural Sciences Changsha410125 China Key Laboratory of Agro-Environment in Midstream of Yangtze Plain Ministry of Agriculture and Rural Affairs Changsha410125 China Key Lab of Prevention Control and Remediation of Soil Heavy Metal Pollution in Hunan Province Changsha410125 China Hunan Academy of Agricultural Sciences China Hunan University China

The effects of heavy metals on soil microbial communities have been extensively investigated, whereas the combined effects of heavy metals and nutrients on soil microbial communities and their interactions are rarely understood. In this study, we investigated the distribution patterns of heavy metals, nutrients and microbial communities in a typical contaminated farmland and explored their interaction mechanisms. The results showed that Cd and Pb were the main pollutants in this area, which mainly came from the smelter. Canonical correspondence analysis and variance decomposition analysis showed that heavy metals played a more important role in restraining soil microbial community structure than other soil properties. Cd, Pb, soil pH and available K content were the most important environmental factors affecting microbial community structures in soil. Major Cd tolerant bacteria and fungi include Actinobacteriota, Gemmatimonadota, Entorrhizomycota and Mortierellomycota. The analysis of molecular ecological network showed that there were a lot of negative correlations among microorganisms. Cd could regulate the abundance of key nodes in Cd-tolerant modules, and these key nodes could improve the adaptability of the whole microbial module to heavy metals through competition with other microorganisms. This study provides basic information for revealing the bioremediation mechanisms of heavy metal contaminated soil. © 2024, The Authors. All rights reserved.

关键词： heavy metals

Detoxification and Resource Utilization of Chromite Ore Processing Residue with Pyrolusite

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SSRN 2022年

作者： Wang, Lanbin Xu, Yangming Tian, Hong Du, Yaguang Key Laboratory of Catalysis Conversion and Energy Materials Chemistry of Ministry of Education Engineering Research Center for Heavy Metal Pollution Control of Hubei Province College of Resources and Environmental Science South-Central MinZu University Wuhan China

Efficient and low-cost recovery of metals from pyrolusite and Chromite Ore Processing Residue (COPR) is of great significance for environmental protection and sustainable development of metal resources. This study proposes a new method for the simultaneous recovery of Cr and Mn from COPR and pyrolusite, to realize COPR resource utilization and detoxification. Under the optimized conditions (i.e., the temperature of 150 °C, the holding time of 1.5 h, the H2SO4 concentration of 3M, the mass ratio of COPR to pyrolusite of 1:1, and the solid-liquid ratio of 1:20), the leaching efficiency of Cr and Mn reached 100% and 85.34% respectively. The Toxicity Characteristic Leaching Procedure (TCLP) total Cr concentration of the detoxified slag was 0.26 mg/L meeting the EPA standard ( © 2022, The Authors. All rights reserved.

关键词： Slags

Nitrogen Removal Performance and Sludge Characteristics of Wastewater from Industrial Recirculating Aquaculture Using Anammox Coupled with Denitrification

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SSRN 2022年

作者： Jian, Jianxiong Sun, Shuiyu Guan, Zhijie Liao, Xiaojian Li, Shoupeng Chen, Shaojin Huang, Zhenhua Chen, Junhao Zhou, Xingfan Zhang, Yumin Yin, Baixuan Guangzhou Key Laboratory Environmental Catalysis and Pollution Control Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control School of Environmental Science and Engineering Institute of Environmental Health and Pollution Control Guangdong University of Technology Guangzhou510006 China Guangdong Province Solid Waste Recycling and Heavy Metal Pollution Control Engineering Technology Research Center Guangdong Polytechnic of Environmental Protection Engineering Foshan528216 China Analysis and Test Center Guangdong University of technology Guangzhou510006 China

Wastewater from industrial recirculating aquaculture systems (IRAS) is highly susceptible to eutrophication and may harm aquatic organisms. To address this problem, we applied a simultaneous anammox and denitrification (SAD) process to treat IRAS wastewater, conducting a static research test and dynamic continuous test lasting 132 days. The results showed that the optimal working parameters of the SAD process were: Temperature (T) = 30℃, pH = 8, Dissolved Oxygen (DO) = 0-0.3 mg/L, solid-liquid ratio = 1:1. At 132 d of operation, the NO2-N : NH4+-N : NO3-N ratio was 1.27 : 1 : 0.08, and the NH4+-N, NO2-N, and TN removal rates were 93.13%, 93.54%, and 89.42%, respectively. The average particle size of the anammox granular sludge increased from 1 mm to 1 cm;the extracellular polymeric substances (EPS) content increased;and the heme content increased from 1.00 mg•g-1 to 2.72 mg•g-1. These results showed a gradual increase in anaerobic ammonia oxidation bacteria (AnAOB) activity. The 16S rRNA gene sequencing results revealed that the community structure is gradually unitary and the genus Candidatus Kuenenia became the dominant bacterium of AnAOB in the dynamic UASB reactor, enhancing the nitrogen removal efficiency. The abundance of denitrifying bacteria also increased. This indicated that the synergistic effect of AnAOB and denitrifying bacteria in nitrogen removal was excellent. The SAD process has high nitrogen removal efficiency and wide applicability, providing a strong theoretical basis and supporting data for subsequent industrial applications. © 2022, The Authors. All rights reserved.

关键词： Nitrogen removal

Using Inverse Distance Weighting and Pb Isotopic Compositions Reveal Source Contribution and Transfer Mechanism of Pb in Soil-Wheat System: A Case Study of Suburban Farmland

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SSRN 2023年

作者： Chen, Zhifan Li, Yipeng Yang, Mengyang Zhou, Han Wu, Di Ding, Renqi Ruan, Xinling Li, Zhihong Ministry of Education Kaifeng475004 China Henan Engineering Research Center for Control & Remediation of Soil Heavy Metal Pollution Henan University Kaifeng475004 China Henan Key Laboratory of Earth System Observation and Modeling Henan University Kaifeng475004 China MLR Key Laboratory of Isotope Geology Institute of Geology Chinese Academy of Geological Sciences Beijing100037 China

This study combined Pb isotopic compositions and inverse distance weighting (IDW) to quantitatively identify contribution rates of different Pb sources for various compartments of soil-wheat system and explored the uptake, transfer pathway and mechanisms of Pb in soil-wheat system in the suburban farmlands of Kaifeng, China. The Pb isotopic compositions in soil-wheat system and environmental samples were measured by multi-collector inductively coupled plasma mass spectrometry. The results showed that the average Pb contents were in order of soil > root > stem > shell > grain, which 18.2% of Pb contents in grain samples were above the national food safe standard for Pb (0.2mg kg-1). Translocation factors of Pb were ranked as TF shell/stem > TF root/soil > TF stem/root > TF grain/shell > TF grain/stem. Quantitative source identification displayed that sewage irrigation gave a decreasing contribution (30.60 % - 67.74 %) from root, soil, wheat stem, shell, leaf to grain, while the contribution of atmospheric deposition had an increasing tendency (30.69 % - 68.62 %). Totally, lighter Pb isotopes from atmospheric deposition are more easily absorbed by leaves and preferably enriched in wheat grains, while wheat roots and stems are the main retention sites of heavier Pb isotopes from sewage irrigation. The result implied that Pb in wheat grains was primarily contributed by atmospheric deposition, wheat roots and stems play an irresistible role in blocking heavy Pb isotopes, effectively decreasing heavy Pb isotopes into wheat grains, thus greatly reducing Pb health risks in wheat grain. Therefore, reasonable adjustment of rhizosphere soil and atmospheric environment or physiological interference on wheat growth might be an effective way to reduce the risk of Pb enrichment in wheat grains. The study gave us a new insight into elucidating uptake, migration pathway and mechanisms of Pb in soil-wheat system. © 2023, The Authors. All rights reserved.

关键词： Soils

Effects of Carotenoid Organic Biomass Acclimated Sludge on Multisubstrate Anaerobic Co-Digestion: Methane Production, Inoculant/Substrate Ratio, and key Enzymes

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SSRN 2024年

作者： Su, Qingmuke Wu, Hui Du, Yaguang Du, Dongyun Zhang, Tian C. Hubei Province Engineering Research Center for Control and Treatment of Heavy Metal Pollution College of Resources and Environmental Science South-Central Minzu University Wuhan430074 China Key Laboratory of Catalysis and Energy Materials Chemistry Ministry of Education Wuhan430074 China Civil and Environmental Engineering Department College of Engineering University of Nebraska-Lincoln OmahaNE68182 United States

The main research object of this project is to domesticate the sludge of anaerobic system of winery with high concentration organic biomass (such as waste carotene) as carbon source through Information Bio-Booster system, and to study the internal mechanism of improving the efficiency and stability of on-site anaerobic digestion. Results showed that the highest methane production (763.03 ml/g-volatile solids) from the inoculated domesticated sludge (I) was achieved at an I/S (co-substrate) ratio of 3, with an increase of about 50% compared to the other ratios studied. Further analysis of the system by macro-genomic and macro-proteomic sequencing analysis revealed that key enzyme activities were enhanced;major metabolic pathways were up-regulated;and hydrolysing and methanogenic bacteria were enriched. These results suggest that the system was improved with organic biomass for rapid utilization of organic matter for methanogenesis. © 2024, The Authors. All rights reserved.

关键词： Biomass

Pb Alleviates as Mobilization During the Biological Reductive Dissolution of Pb-As Jarosite

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SSRN 2024年

作者： Zhang, Tingzheng Zhang, Kejing Liu, Qingcai Liu, Weizao Ding, Chunlian Shi, Yan College of Materials Science and Engineering Chongqing University Chongqing400044 China Institute of Environmental Science and Engineering School of Metallurgy and Environment Central South University Changsha410083 China State Key Laboratory of Advanced Metallurgy for Non-ferrous Metals Changsha410083 China Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution Changsha410083 China

The biological transformation of jarosite exacerbates As mobilization in acid mine drainage environments, which is influenced by coexisting heavy metals. However, few research has paid attention to the effect of coexisting Pb on this biogeochemical process. Here, we investigated the behavior of As during reductive dissolution of Pb-As jarosite (PbFe3(SO4, AsO4)2(OH)6) by a sulfate reducing bacterium of Desulfovibrio desulfuricans. Pb incorporation inhibited jarosite dissolution and As mobilization. S2- produced via anaerobic respiration of D. desulfuricans was partially captured by Pb2+ to form PbS, which negatively affected the reduction of Fe3+ in jarosite to aqueous Fe2+, slowing down the dissolution of Pb-As jarosite and As release. Furthermore, the dissolved As was quickly precipitated by forming As2S3 or being absorbed on formed amorphous secondary minerals, resulting in only trace amount of As retained in aqueous environment. Transcriptomic analysis showed that the trace amount of As still activated ars arsenate reduction pathway, but blocked sulfate reduction and extracellular electron transfer. Our findings provided a new perspective for investigating the geochemical cycling of As in acid mine drainage environments. © 2024, The Authors. All rights reserved.

关键词： Dissolution

海胆状CoTe-CoP异质结构催化剂在全pH范围内高效析氢

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Science China Materials 2024年第6期67卷 1891-1899页

作者：朱少柯邢明辉路站宽乔泽龙王世涛赵青蓝邵敏华甑崇礼曹达鹏 State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Department of Chemical and Biological Engineering Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong 999077China Energy Institute and Chinese National Engineering Research Center for Control&Treatment of Heavy Metal PollutionThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong 999077China Qingdao International Academician Park Research Institute Qingdao 266000China School of Chemical Engineering The University of New South WalesSydney NSW 2052Australia

研发长效稳定、pH适应性强的析氢反应(HER)催化剂对实现大规模制氢具有重要意义.界面工程是研发高效HER催化剂的有效策略之一.本文成功构建了海胆状异质结构催化剂CoTe-CoP/***和CoP的协同作用不仅优化了电子结构、暴露了更多的活性位点... 详细信息

研发长效稳定、pH适应性强的析氢反应(HER)催化剂对实现大规模制氢具有重要意义.界面工程是研发高效HER催化剂的有效策略之一.本文成功构建了海胆状异质结构催化剂CoTe-CoP/***和CoP的协同作用不仅优化了电子结构、暴露了更多的活性位点,而且有效地提高了催化剂的亲水性和疏气性.密度泛函理论计算表明:CoTe与CoP之间的相互作用有效地降低了水的解离能垒,同时增强了对H~*的吸附.这些结果使得CoTe-CoP/NF在整个pH范围内具有优异的HER性能和催化稳定性.在酸性、碱性和中性介质中,CoTe-CoP/NF电极驱动10 mA cm^(-2)的电流密度仅需51、53和75 mV的过电位.总之,本工作为在全pH范围内构建高性能HER催化剂提供了一种界面工程新策略.

关键词： heterostructure hydrogen evolution reactions in-terface engineering all-pH range synergy effect