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Effects of simulated in-situ electrokinetic remediation on physicochemical properties and phosphorus migration of sediments 5

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Effects of simulated in-situ electrokinetic remediation on p...

2021 5th International Conference on Green Composite Materials and Nanotechnology, GCMN 2021

作者： Wang, Huapeng Li, Jincheng Wang, Xiaoxiao Lu, Zuxian Wei, Chunman Luo, Xuejing Zhong, Yijian Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology Guilin University of Technology Guilin541004 China Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area Guilin University of Technology Guilin541004 China Guangxi Key Lab. of Environ. Poll. Contr. Theor. and Technol. for Sci. and Educ. Comb. with Sci. and Technol. Innov. Base Guilin University of Technology Guilin541004 China

The effect of simulated in-situ electrokinetic remediation (EKR) on phosphorus release from contaminated sediments was investigated. The effects of different anode materials (iron, aluminum, graphite and stainless steel) on the physicochemical properties and phosphorus migration were compared. The results showed that aluminum anode had the best inhibition effect on phosphorus release from sediments, and the highest inhibition rate of phosphorus release was 78.20% compared with non EKR, but the sustainability was poor, and the performance of iron anode is generally stable. The phosphorus in the sediments generally shows the migration trend from cathode to anode. After EKR, the Oxidation-Reduction Potential (ORP) of the sediment decreased with the increase of normalized distance from anode. The anaerobic environment of the sediment on iron anode was the most serious, and the lowest was -616mV. The ORP of the sediment from the anode area to the middle area of other electrodes was effectively improved. The pH of the sediment increases gradually from anode to cathode, and is characterized by acidification in the anode area and alkalization in the cathode area. Iron and stainless steel electrodes have more acidic areas, showing better electrolysis efficiency. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Anodes

Lanthanum Hybridized with Fe3o4 For Efficient Phosphate Adsorption: Synthesis, Characterization, and Phosphorus Enrichment

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SSRN 2022年

作者： Hao, Haotian Huang, Xu Xu, Shuo Wang, Yili Shi, Baoyou Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water Pollution Beijing Forestry University Beijing100083 China

Recovery of low concentration phosphate in water is an effective strategy to control eutrophication and alleviate phosphorus (P) shortage crisis. In this study, a series of lanthanum (La)-based magnetic composites which includes the phosphate-binding lanthanum forms (La3+/La2(CO3)3/La(OH)3/La2O3) hybridized with Fe3O4 nanoparticle were fabricated by in situ embedded approach for phosphate uptake from water. Based upon the screening of synthesized four lanthanum forms and La-to-Fe molar ratios in terms of phosphate adsorption capacity, a La3+@Fe3O4 composite with the La-to-Fe molar ratio of 4:1 (MLI-41) was selected for further detailed characterization and evaluation. MLI-41 exhibits a competitive phosphate adsorption capacity of 77.85 mg P/g, good phosphate adsorption activity over the broad pH range from 5 to 10, excellent phosphate adsorption selectivity in the presence of competing ions (Cl–, NO3–, SO42–, HCO3−, Ca2+, Mg2+, HA). In four actual P-containing environmental water bodies (TP © 2022, The Authors. All rights reserved.

关键词： Magnetic separation

Enhancement of partial denitrification by nirS -deficient strain of Pseudomonas aeruginosa in treatment of liquor brewing wastewater

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Journal of water Process Engineering 2025年 75卷

作者： Shiqi Huang Haoyong Li Chunyu Zhou Haowen Zhang Dezhi Sun Xinying Liu Yan Dang College of Environmental Science and Engineering Beijing Forestry University Beijing 100083 China Beijing Key Laboratory for Source Control Technology of Water Pollution Engineering Research Center for Water Pollution Source Control and Eco-remediation Beijing Forestry University Beijing 100083 China

The anaerobically treated liquor brewing wastewater contains high ammonium concentrations and limited biodegradable organics, which is advisable to be treated via partial denitrification (PD) coupled with Anammox. In this study, a nirS -deficient strain of Pseudomonas aeruginosa ( P. aeruginosa ∆ nirS ) was constructed to restrict nitrate reduction to nitrite. By applying P. aeruginosa Δ nirS in the inoculum for biomass attachment to carriers during biofilm pre-cultivation, biofilm-based PD reactor was bioaugmented to enhance the operational performance at 30 °C. During stable operation, besides the favorable nitrate removal efficiency (90.2 %), the nitrite accumulation efficiency (91.7 %) was significantly higher than that (76.1 %) in control group. Additionally, the organic removal performance was strengthened in the bioaugmented PD process. Quantitative analysis via regional fluorescence integration revealed humic acids and microbial metabolites were degraded, with the intensities decreasing by 67.1 % and 31.2 %, respectively. In PD-Anammox, the desirable nitrogen removal performance was indicated by both high ammonium removal efficiency (>98 %) and total nitrogen removal efficiency (>85 %). Pseudomonas (7.9 %) and Thauera (10.0 %) were enriched and relative abundances of genes associated with refractory organics degradation were increased in P. aeruginosa ∆ nirS group. Furthermore, metagenomic analysis demonstrated that the nitrate-to-nitrite reduction pathway was enhanced while the nitrite-to-nitrous oxide reduction pathway was remarkably inhibited. These results provide new insights into enhancement strategy using genetically engineered strain for PD-Anammox treating complex refractory wastewater.

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Effects of cultivation strategies on the cultivation of Chlorella sp. HQ in photoreactors

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Frontiers of Environmental Science & Engineering 2019年第5期13卷 151-161页

作者： Xiaoya Liu Yu Hong Peirui Liu Jingjing Zhan Ran Yan Beijing Key Laboratory for Source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China

The effects of cultivation strategies (including autotrophic cultivation (AC), heterotrophic cultivation (HC), fed-batch cultivation (FC), heterotrophic+ autotrophic two-stage cultivation (HATC), and heterotrophic+ mixotrophic two-stage cultivation (HMTC)) on the growth and lipid accumulation of Chlorella sp. HQ and its total nitrogen (TN) and total phosphorus (TP) removal in secondary effluent were investigated in column photoreactors. The results showed that the TN and TP removal rates ranged between 93.72%–95.82% and 92.73%–100%, respectively, under the five different strategies. The microalgal growth potential evaluated by the maximal growth rate (Rmax) was in the order of HMTC>HC>FC>AC>HATC. The values of biomass, total lipid yield, triacylglycerols (TAGs) yield, and total lipid content of the microalga cultivated in the last 5 d increased significantly, but the TAGs productivities of the five strategies were lower than those in the first 7 d. Compared with all the other cultivation strategies, the TAGs productivity and yield after 12 d of cultivation under the heterotrophic condition reached the highest values accompanying the highest level of intracellular reactive oxygen species (ROS), in which the TAGs yield reached 40.81 mg/L at the end of the cultivation period. The peaks in TAGs yield and ROS level suggested that HC was beneficial for lipids accumulation via regulating the cellular redox status and exerting ROS stress on microalgal cells. In summary, HMTC was the best cultivation strategy for improving the microalgal biomass and HC was the best strategy for microalgal TAGs accumulation to produce biodiesel.

关键词： Chlorella sp.HQ Cultivation strategy lipids Nitrogen removal Phosphorus removal Reactive oxygen species

Facile activation of natural calcium-rich sepiolite with oxalic acid for selective Pb(II) removal: Highly-efficient performance, mechanisms and site energy distribution

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Chemosphere 2023年 342卷 140201页

作者： Ma, Shoucheng Wei, Song Li, Siyuan Wei, Wei Huang, Yao School of Environment Jiangsu Engineering Lab of Water and Soil Eco-remediation Jiangsu Province Engineering Research Center of Environmental Risk Prevention and Emergency Response Technology Nanjing Normal University Nanjing210023 China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing210023 China Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area Guilin University of Technology Guilin541004 China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management Institute of Eco-environmental and Soil Sciences National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Academy of Sciences Guangzhou510650 China

The design and development of adsorbents with high efficiency, selectivity, and economy for Pb(II) are essential to environmental governance and ecological safety. Herein, an oxalic acid (OA) activated natural sepiolite (nSEP) composite for highly efficient Pb(II) removal was prepared by a facile impregnation strategy. The OA activated nSEP nanocomposite (OA-nSEP) was characterized by various instrumental techniques and its adsorption performance towards Pb(II) was further evaluated through a series of static and dynamic experiments under various environmental conditions. Results revealed that OA reacted with the calcium impurities in nSEP to form calcium oxalate, causing mesoporous structure and larger specific surface area of OA-nSEP. The obtained OA-nSEP possessed super high Pb(II) adsorption capacities (858.4–1252 mg/g), which were much higher than that of most modified clays or conventional materials. The average adsorption site energy and the standard deviation of the site energy distribution were analyzed to investigate the strength of Pb(II) binding onto OA-nSEP and the adsorption site heterogeneity. Mechanism studies confirmed that oxalate groups exerted a primary role in the adsorption process. X-ray diffraction and X-ray photoelectron spectrometry (XPS) unveiled that the coordination of oxalate with Pb(II) and precipitation of lead oxalate was responsible for the high efficiency and selectivity. Distinguishing feature of high adsorption capacity, specific selective adsorption, abundant availability, and splendid reusability make the OA-nSEP a promising candidate for eliminating Pb(II) in practical scenarios. © 2023 Elsevier Ltd

关键词： Oxalic acid

Multifaceted Effects of Ultrasonic Enhanced Fe-C/Pds System for Sludge Dewatering and Resource Utilization: Synergy of Oxidation and Cracking Processes

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SSRN 2024年

作者： Li, Wenye Xie, Binghan Li, Qinghao Li, Zhipeng Zhu, Jing You, Hong Zhang, Guoyu Li, Weirun Xing, Xiaodi Zeng, Fanbo Li, Lingjie Zhao, Shuyu Shang, Zhiwei Wang, Shuxiao Harbin Institute of Technology Weihai Sch Marine Sci & Technol Weihai264209 China Harbin Inst Technol Sch Environm State Key Lab Urban Water Resource & Environm Harbin150090 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

The effective dewatering of waste activated sludge (WAS) and the utilization of resources are crucial for the sustainable development of wastewater treatment plants. In this study, ultrasonic (US) collaborative Fe-C activated peroxydisulfate (PDS) coupling system was constructed to investigate the shift in physicochemical properties and explore the mechanisms during the cracking and oxidation of WAS. The US enhanced Fe-C/PDS system exhibited excellent oxidation capacity with the water content (Wc) of sludge cake and the specific resistance to filtration (SRF) reducing to 61.71% and 1.12×1012 m/kg under the conditions of PDS, Fe-C, and US power levels at 120 mg/g TS, 300mg/g TS, and 150W. Furthermore, the high cracking capacity led to a rise in soluble chemical oxygen demand to 630.64 mg/L and a 9.16% reduction in volatile solids. Compared to Fe-C/PDS, the addition of US enhanced the leaching of Fe, promoted to the formation of reactive oxidative species. The contribution of ·O2-and 1O2 to sludge conditioning was 37% and 43.17%, indicating the oxidation process of free radicals and non-free radicals in Fe-C/PDS/US system. Additionally, US improved the cracking capacity of the system, releasing bound extracellular polymeric substances (EPS) and degrading into soluble properties. The concentration of short-chain fatty acids (SCFAs) in the sludge was increased by 96.7%, which significantly improved the quality of carbon source suitable for recycling. The positive improvement of sludge physicochemical properties revealed the decryption-degradation synergistic effect of the coupled systems. These findings provide a novel strategy for effective disposal and reduction in WAS while also offering valuable insights into resource utilization. © 2024, The Authors. All rights reserved.

关键词： Dewatering

Intraparticle Sorption and Desorption of Antibiotics

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SSRN 2023年

作者： Zhang, Cheng Li, Rong Ke, Dongfang Suo, Hongri Wang, Shuai Ma, Enze Chen, Yulong Liu, Chongxuan State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Guangdong Shenzhen518055 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 Guangdong Guangzhou510006 China Department of Ocean Science and Engineering Southern University of Science and Technology Guangdong Shenzhen518055 China

Intraparticle domains are the critical locations for storing contaminants and retarding contaminant transport in subsurface environments. While the kinetics of antibiotics (ATs) sorption and desorption in subsurface materials have been extensively studied, their behaviors in intraparticle domains have not been well understood. This study investigated the sorption and desorption of ATs in the intraparticle domains using quartz sands and clay, and tetracycline (TC) and levofloxacin (LEV) as examples that are commonly present in groundwater systems. Batch experiments coupled with the analyses using various microscopic and spectroscopic techniques were performed to investigate the sorption and desorption kinetics, and to provide insights into the intraparticle sorption/desorption of TC and LEV. Results indicated that both TC and LEV with different physiochemical properties can migrate into intraparticle domains that were consistent with sorptive diffusion. The rate and extent of the sorption are a function of intraparticle surface area, pore volume and connectivity, and ionic properties of the ATs. The sorptive diffusion led to the slow desorption of both TC and LEV after their sorption, apparently showing an irreversible desorption behavior. Therefore, intraparticle domains can be important locations for storing ATs, retarding ATs transport, and may serve as a long-term secondary source for groundwater contamination. © 2023, The Authors. All rights reserved.

关键词： Antibiotics

Sustainable Regeneration of Hydrochar-Supported Ni Catalyst in Low-Temperature Steam Reforming of Biomass Tar

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SSRN 2024年

作者： Gai, Chao Tao, Yijing Peng, Nana Dou, Xiaoming Liu, Zhengang Research Center for Eco-Environmental Sciences Chinese Academy of Sciences 18 Shuangqing Road Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China Department of Applied Chemistry School of Engineering Tohoku University Miyagi Sendai980-8577 Japan Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China

Catalytic tar reforming through biochar-supported nanoparticle catalyst has become a hot topic in biomass conversion;however, the deactivation of catalysts still remain a fundamental challenge. The deactivation and regeneration studies for pyrochar-based catalysts upon high temperature (700-900 oC) tar reforming has gathered momentum in recent years, yet the deactivation and regeneration mechanism of the hydrochar-based catalysts under low temperature reforming of biomass tar (e.g., 600 oC), still remain elusive so far. Here we report the facile N2 regeneration treatment (30 mL/min for 30 min) for the deactivated hydrochar-supported Ni catalyst facilitate the tar reforming activity and enhance the stability, by leveraging oxidization towards coke/hydrochar support hindrance, in an effort to alleviate the coke deposition as well as suppress metal sintering without compromising its reforming activity toward tar molecules than other regeneration atmospheres, including CO2, O2 and Air. Our findings bring new understanding of the deactivation and regeneration mechanism of the hydrochar-based tar reforming catalysts, and enable an economically and industrially viable path for biomass conversion. © 2024, The Authors. All rights reserved.

关键词： Biomass

Efficiently Removing Dissolved Organic Pollutants in Landfill Leachate Concentrate Using Dual-Anode Fe2+/Hclo System: The Significance of Insolubilization Based On Oxidative Coupling of Organics

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SSRN 2023年

作者： Liang, Sheng Wang, Jinling Shen, Zhizhi Yan, Wei Nengzi, Lichao Feng, Chunhua Yu, Li Hu, Junqing College of Health Science and Environmental Engineering Shenzhen Technology University Shenzhen518118 China Faculty of Chemical Engineering Kunming University of Science and Technology Kunming650500 China State Environmental Protection Key Laboratory of Managing Technology of Drinking Water Source Shenzhen Academy of Environmental Science Shenzhen518001 China 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

The strategy to mineralize dissolved organics for the decontamination of landfill leachate concentrate (LLC) is expensive. Because mineralization requires high stoichiometric ratio of oxidants (e.g., •OH) or electron transfer (i.e., energy) to the pollutants molecular. Whereas, transferring the dissolved organic pollutants into separable insoluble matters is an energy-saving strategy. Herein, we developed a dual-anode Fe2+/HClO system for removing dissolved organic pollutants in LLC through insolubilization based on oxidative coupling. In this system, the majority of dissolved organic pollutants were transferred into insoluble substances, which could be removed easily. 89.8% of the dissolved organic carbon (DOC) in LLC was fast removed in 3 hours with a low specific energy consumption (SEC, 4.0 kWh kg-1 COD and 17.6 kWh kg-1 DOC), and the formation of toxic by-products can be well controlled. Interestingly, the formation of insoluble substances was predominantly attributed to the oxidative coupling of organic small molecules into the macromolecular ones. This was evidenced by the generation of insoluble compounds with the larger molecular mass (evidenced by mass spectrums), and the formation of coupling or polymerization products of the model pollutant (guaiacol). Specifically, the macromolecular matters were derived from the organic radicals (evidenced by EPR tests) coupling with each other. It was reported that Fe2+/HClO reaction produced reactive Fe(IV) under acid condition. According to the investigations in this work, we propose it is possibly because Fe(IV) was generated in the dual-anode Fe2+/HClO system, and Fe(IV) oxidized pollutants to produce the organic radicals. This work offers a novel electrochemical method for efficient removal of organic pollutants in LLC with minimal toxic by-products generated, and revealed the significance of oxidative coupling process in the electrochemical Fe2+/HClO system. © 2023, The Authors. All rights reserved.

关键词： Organic pollutants