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Dynamic regulation strategies of cation exchange resin enhancing volatile fatty acids production in anaerobic fermentation of waste activated sludge: Performance and mechanisms

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Chemical Engineering Journal 2025年 516卷

作者： Shifa Huang Jincai Luo Xinyun Wang Jingying Liao Shanyan Dong Yichun Zhu Jiangxi University of Science and Technology Ganzhou 341000 China Jinggangshan University Affiliated Hospital Ji’an 343000 China Jiangxi Province Ganzhou Key Laboratory of Basin Pollution Simulation and Control Ganzhou 341000 China Jiangxi Provincial Key Laboratory of Environmental Geo-technology and Engineering Disaster Control Ganzhou 341000 China

Addressing the challenge of metal ion-mediated floc stability limiting organic matter release and product-directed control during the anaerobic fermentation of waste activated sludge (WAS), this study proposes a dynamic regulation strategy using cation exchange resins (CER). By comparing staged treatment (CER separation post-pretreatment) with full-cycle treatment (continuous CER involvement), the study systematically deciphers the synergistic mechanisms under CER dynamic control. These include substantial metal removal, enhanced solubilization of organic matter (with soluble chemical oxygen demand peaks reaching 3.49 times that of the control group), and restructuring of the microbial community (with a 4.18-fold increase in the abundance of acetogenic bacteria from the Petrimonas ). The full-cycle treatment group (3.4 g CER/g TS) reached a volatile fatty acids (VFAs) production of 1591.51 mg/L, which is 9.84 times that of the control group, with acetic acid comprising 72.13 %. Through reversible ion exchange maintaining metal balance, the II-1 group (low dosage, extended retention) showed an 18.02 % increase in methane production (478.7 mL). High-throughput sequencing analysis reveals that the sustained action of CER activates key genes in glycolysis and pyruvate oxidation (with a 3.58–19.66 % increase in related gene expression) and inhibits the acetic acid cleavage pathway (downregulation of the cdh gene by 5.40–6.08 %), driving metabolism towards acetic acid accumulation, thus constructing a “hydrolysis-enhanced − acetate accumulation − methane suppression” cascading metabolic network. The dynamic control of CER through a “metal deficit − enzyme activity compensation − functional microbial community acclimation” cascading effect achieves either “carbon-source priority” or “energy balance” in product-directed transformation.

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Quenching Residual H2o2 From Uv/H2o2 With Granular Activated Carbon: A Significant Impact Of Bicarbonate

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SSRN 2023年

作者： Zeng, Jinfeng Zhang, Miao Qin, Xinxin He, Yi Liu, Xinyue Zhu, Yichun Liu, Zuwen Li, Wentao Dong, Huiyu Qiang, Zhimin Lian, Junfeng Jiangxi Provincial Key Laboratory of Water Ecological Conservation at Headwater Regions Jiangxi University of Science and Technology 1958 Ke-jia Road Ganzhou341000 China Ganzhou Key Laboratory of Basin Pollution Simulation and Control Jiangxi University of Science and Technology 1958 Ke-jia Road Ganzhou341000 China National－local Joint Engineering Laboratory of Water Engineering Safety and Efficient Utilization of Resources in Poyang Lake Watershed Nanchang Institute of Technology Nanchang330099 China KeyLaboratoryofDrinkingWaterScienceandTechnology ResearchCenterforEcoEnvironmental Sciences Chinese Academy of Sciences 18 Shuang-qing Road Beijing100085 China Hydrology and Water Resources Monitoring Center for Ganjiang Upstream Watershed 8 Zhang-jia-wei Road Ganzhou341000 China

UV/H2O2 has been used as an advanced oxidation process to remove organic micropollutants from drinking water. Residual H2O2 should be quenched to avoid potential damage to the distribution system or disinfectant wastage during the subsequent chlorination/chloramination process. Granular activated carbon (GAC) filter can quench the residual oxidant and eliminate some of the dissolved organic matter. However, knowledge on the kinetics and governing factors of GAC quenching of residual H2O2 from UV/H2O2 and the mechanism underlying the enhancement of the process by HCO3– is limited. Therefore, this study aimed to analyse the kinetics and influential factors, particularly the significant impact of bicarbonate (HCO3–). H2O2 decomposition by GAC followed first-order kinetics, and the rate constants normalised by the GAC dosage (kn) were steady (1.6 × 10–3 L g–1 min–1) with variations in the GAC dosage and initial H2O2 concentration. Alkaline conditions favour H2O2 quenching. Basic groups of the GAC contributed more to H2O2 quenching than did acidic groups, with their specific kn values being 8.9 and 2.4 min–1 M–1, respectively. The presence of chloride, sulphate, nitrate, and dissolved organic matter inhibited H2O2 quenching, while HCO3– promoted it. The interfacial hydroxyl radical (HO•) zones were visualised on the GAC surface, and HCO3– addition increased the HO• concentration. HCO3– increased the concentration of persistent free radicals (PFRs) on the GAC surface, which mainly contributed to HO• generation. A significant enhancement of HCO3– on H2O2 quenching by GAC was also verified in real water. This study revealed the synergistic mechanism of HCO3– and GAC on H2O2 quenching and presents the potential applications of residual H2O2 in the H2O2-based oxidation processes. © 2023, The Authors. All rights reserved.

关键词： Sulfur compounds

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Spatiotemporal Distribution of Microplastics in the Ganjiang River (ganzhou Section): Insight into the Source Area Impact

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SSRN 2022年

作者： Qin, Xinxin Sun, Nan Teng, Wenxi Zhu, Yichun Liu, Zuwen Li, Wentao Dong, Huiyu Qiang, Zhimin Zeng, Jinfeng Lian, Junfeng Jiangxi Provincial Key Laboratory of Environmental Geotechnology and Engineering Disaster Control Jiangxi University of Science and Technology 1958 Ke-jia Road Ganzhou341000 China Ganzhou Key Laboratory of Basin Pollution Simulation and Control Jiangxi University of Science and Technology 1958 Ke-jia Road Ganzhou341000 China School of Life Sciences Jinggangshan University Ji’an343009 China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences 18 Shuang-qing Road Beijing100085 China Hydrology and Water Resources Monitoring Center for Ganjiang Upstream Watershed 8 Zhang-jia-wei Road Ganzhou341000 China

The accumulation of microplastic (MP) pollution in rivers has become a global concern;however, the underlying mechanism for spatiotemporal effects on MPs remains unclear. This study investigated the Ganjiang River source area with a field survey and found relatively low MP abundances in the target rivers (3.47 ± 0.95 items/L) owing to the small background in the riverine source area. The average MP abundance in the dry season (10.9 ± 2.33 items/L) was higher than that in the middle wet season (3.47 ± 0.95 items/L), and small MPs were prone to scouring from land. Within the predominant MP shape (fiber and fragment), size (0.125–0.5 mm), and colour (polychrome and white) distribution, the contribution of functional areas was as follows: industrial > scenic > residential > natural area. MP abundances fluctuated with different rainfall levels in the wet season, while during the period when the river flow was manually regulated, a good linear relationship was observed between river flow and MP abundance, suggesting that land scouring and transportation may play a more important role than other factors. The upper river regions predominated in the group in which the average MP abundance in the dry season was higher than that in the wet season. The small watershed area in the upstream region would lead to a low terrestrial MP number, making it easy for MP content in rivers to reach a platform. This work contributes to the understanding of MP distribution in freshwater and provides a potential guideline for MP control. © 2022, The Authors. All rights reserved.

关键词： Microplastic

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Modified Lamno3 Perovskite Oxide as Nox Storage and Reduction Catalyst For Emission control of Hydrogen Internal Combustion Engines

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SSRN 2024年

作者： Zou, Yingtong Xu, Guangyan An, Yingsheng Zhang, Mengyuan Sun, Yanwei Liu, Zhi Yu, Yunbo He, Hong State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341000 China

As a flagship of zero-carbon emission in transportation, hydrogen internal combustion engine vehicles alleviate global warming pressure but are still restricted by high nitrogen oxides (NOx) emission. A promising approach to reduce NOx emission is NOx storage and reduction (NSR) technique by using on-board H2 as a reductant. As the new generation of NSR catalyst, La-based perovskite oxides are plagued by small specific surface area and poor reactivity, thus restricting their usability. Here, we proposed to simply fabricate porous LaMnO3 perovskite oxide via Pechini method (PC) with the addition of pore-forming agent, Pluronic 123 (P123). The modified LaMnO3 catalyst (LMO-PC-P) obtained by PC-P method exhibited large special surface area and abundant oxygen vacancies. Such structure feature not only provided more active sites for NOx storage but also facilitated NO oxidation via forming hyponitrite (N2O22-) rapidly on defective surface in fuel-lean condition. As a result, an excellent static NOx storage capability (NSC) was achieved, with a maximum NSC value of 205 μmol/g. Over the LMO-PC-P sample, meanwhile, desorption of NOx in fuel-rich mode was promoted, thus benefiting the regeneration of active sites. In dynamic NSR test, LMO-PC-P could achieve 82% total NOx conversion with high effectiveness at 350 oC. This study presented a convenient and practical approach for preparing porous and defective NSR perovskite oxide catalysts for NOx emission control of hydrogen internal combustion engines. © 2024, The Authors. All rights reserved.

关键词： Nitrogen oxides

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Time-Resolved in Situ Infrared and Two-Dimensional Correlation Spectroscopy of V2o5/Tio2: Effects of Wo3 and Moo3 Loadings for Nh3-Scr

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SSRN 2023年

作者： Lv, Zhihui He, Guangzhi Ge, Yanli Liu, Yongchun Yu, Yunbo He, Hong State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China State Key Joint Laboratory of Environmental Simulation and Pollution Control Beijing Innovation Center for Engineering Science and Advanced Technology College of Environmental Science and Engineering Peking University Beijing100871 China Aerosol and Haze Laboratory Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing100029 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341000 China Center for Excellence in Regional Atmospheric Environment Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China

Vanadia-based catalysts are widely applied in NOx reduction, while the promoting effect of WO3 and MoO3 is still under debate. Herein, we prepared V2O5/TiO2, V2O5-WO3/TiO2, and V2O5-MoO3/TiO2 catalysts and revealed that WO3 and MoO3 enhanced the activity of V2O5/TiO2, particularly under wet conditions. In situ DRIFTS, two-dimensional correlation spectroscopy (2D COS), and DFT calculations demonstrated that NH3 adsorption on Lewis acid sites of V2O5/TiO2 resulted in the formation of NH3ads-L1 (1284 cm-1, Ti sites of O=V-O-Ti) and NH3ads-L2 (1604 cm-1, V=O sites). By using 2D COS, we firstly found that the NH3ads-L1 exhibited higher reactivity towards NO to produce NH2NO* via NH2*, which was promoted by WO3. Moreover, WO3 and MoO3 doping inhibited H2O adsorption, and promoted its desorption at elevated temperature, thus protecting the V=O sites on V2O5/TiO2. Also, 2D COS analysis provides a new perspective for in-depth understanding of the active sites and intermediates in NH3-SCR reaction. © 2023, The Authors. All rights reserved.

关键词： Catalysts

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Effects of Wo3 and Moo3 Loadings on Vanadia-Based Catalysts for Nh3-Scr: Revealed by in Situ Infrared and Two-Dimensional Correlation Spectroscopy

SSRN

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SSRN 2023年

Vanadia-based catalysts have been widely applied in NOx reduction, while the promoting effects of WO3 and MoO3 are still under debate. Herein, we prepared V2O5/TiO2, V2O5-WO3/TiO2, and V2O5-MoO3/TiO2 catalysts and revealed that WO3 and MoO3 enhanced the activity of V2O5/TiO2, especially under wet conditions. In situ DRIFTS, two-dimensional correlation spectroscopy (2D COS), and DFT calculations demonstrated that NH3 adsorbed on Lewis acid sites of V2O5/TiO2, resulting in the formation of NH3ads-L1 (1284 cm-1, Ti sites of O=V-O-Ti) and NH3ads-L2 (1604 cm-1, V=O sites). By using 2D COS, we found that the NH3ads-L1 exhibited higher reactivity towards NO to produce NH2NO* via NH2*, which was promoted by WO3. Moreover, WO3 and MoO3 doping inhibited H2O adsorption, and promoted its desorption by increasing temperature, thus protecting the V=O sites on V2O5/TiO2. Also, 2D COS provided a new perspective for in-depth understanding of the active sites and intermediates in the NH3-SCR reaction. © 2023, The Authors. All rights reserved.

关键词： Catalysts

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Evidence of sewage discharge on the coalescence mechanism of aquatic microbial communities during high amplitude hydrological periods

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Science of the Total Environment 2025年 959卷 178223页

作者： Kou, Xin Huang, Shier Bian, Rui Tang, Qingwen Wang, Hui Liu, Song Wang, Li Qi, Weixiao Cao, Xiaofeng Lan, Huachun Liu, Huijuan Qu, Jiuhui Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Center for Ecological Civilization Tsinghua University Beijing100084 China Center of Tsinghua Think Tanks Tsinghua University Beijing100084 China School of Environment Northeast Normal University Changchun130117 China Co. Ltd. Zunyi564501 China Chishui River Middle Basin Watershed ecosystem Observation and Research Station of Guizhou Province Zunyi564501 China

Microbial community coalescence is a ubiquitous ecological process in various ecosystems. However, limited research has addressed the effects of the coalescence on microbial ecological processes and network structure, particularly in the context of sewage discharge during high amplitude hydrological periods. Employing 16S rRNA sequencing and species source tracking analysis, we investigated the coalescence pattern of bacterioplankton in the Chishui river and sewage across various hydrological periods. The results demonstrated that the downstream bacterioplankton mainly originated from the upstream water body, and the sewage discharge from the wastewater treatment plants (WWTPs) had less impact on the downstream bacterioplankton. In the low-water period, the bacterioplankton community showed significant coalescence, and the specialist species and functional taxa gathered in the downstream. Bacterioplankton displayed distinct ecological succession patterns after community coalescence, with notable variations in the abundance of dominant group. Bacterioplankton community assembly was dominated by stochastic processes in river and the sewage over different hydrological periods. The ecological networks exhibited the highest complexity in the high-water period, whereas their stability was most pronounced in the low-water period. Species diversity, as opposed to functional and phylogenetic diversity, might be a more accurate indicator to predict changes in microbial network structure. Our findings will provide new perspectives on the mechanisms of aquatic microbial community coalescence in natural environments. © 2024 Elsevier B.V.

关键词： Anthropogenic

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Unveiling the Confinement and Interface Effect on Low Temperature Degradation of Toluene Over Mesoporous Zeolite Encapsulated Pt-Ceo2 Catalyst

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SSRN 2023年

作者： Zhang, Qiuli Yang, Senyou Zhang, Hongxiang He, Tianyao Liu, Wenming Sun, Xiaomin Li, Guobo Yu, Yunbo Peng, Honggen School of Chemistry and Chemical Engineering Nanchang University 999 Xuefu Road Jiangxi Nanchang330031 China School of Resources and Environment Nanchang University 999 Xuefu Road Jiangxi Nanchang330031 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341000 China Environment Research Institute Shandong University Qingdao266237 China State Key Joint Laboratory of Environmental Simulation and Pollution Control China

The low-temperature efficient degradation of volatile organic compounds (VOCs) is imminent due to the serious hazards it poses to the environment and human health. Precious metal-based catalysts have excellent performance, but they are prone to sintering and aggregation at high temperatures, which limits their applications. Therefore, inhibiting the migration aggregation of precious metals during the reaction process can effectively improve the utilization of precious metals and alleviate the deactivation of catalysts. In this study, a novel encapsulated catalyst (Pt-CeO2@meso-S1) containing Pt-CeO2 interfaces was constructed by using mesoporous-rich zeolite as a shell layer and applied to the catalytic oxidation of toluene. The introduction of CeO2 constructed a Pt-CeO2 active interface to promote the low-temperature degradation of toluene, achieving complete oxidation of toluene at 160 ℃. The crystalline phase transition strategy enhanced the specific surface area, which improved the dispersion of platinum and facilitated the construction of the Pt-CeO2 interface. The zeolite shell and mesoporous pores could effectively confine/stabilize the Pt-CeO2 active components and inhibit the sintering of Pt to obtain outstanding water resistance and high-temperature stability. DFT calculations demonstrated that the presence of the Pt-CeO2 active interfaces reduces the oxygen vacancy formation energy and facilitates the activation of gas-phase oxygen. The Mars-van-Krevelen (MvK) mechanism governs the degradation of toluene over Pt-CeO2@meso-S1 was revealed by the in situ DRIFTS. This work provides a good candidate for industrial high-performance catalytic removal of VOCs at low temperatures. © 2023, The Authors. All rights reserved.

关键词： Volatile organic compounds

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The Study of Pt/Zeolites for Co Oxidation: Effects of Skeleton Structure and Si/Al Ratio

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SSRN 2023年

作者： Tian, Xudong Shan, Yulong Yu, Yunbo Zhang, Jian Yan, Zidi Sun, Yu Ding, Wenqing School of Rare Earths University of Science and Technology of China Hefei230026 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341000 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing100029 China

Effects of framework and Si/Al of Pt/zeolites on CO catalytic oxidation were investigated. CO conversion increased with decreasing pore size and increasing Si/Al. The optimized Pt/CHA with Si/Al of 17 showed the highest activity, achieving complete CO conversion below 140 °C. The large CHA cavity plays important role, which lead to higher CO conversion of Pt/CHA than Pt/BEA and Pt/MFI zeolites. Increasing Si/Al favors the presence of Pt0, which showed excellent CO catalytic oxidation ability. The framework with high Si/Al protected Pt0 from accumulating and dealumination during hydrothermal aging, resulting in high hydrothermal stability. © 2023, The Authors. All rights reserved.

关键词： Zeolites

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Mesoporous LaCoO3 perovskite oxide with high catalytic performance for NOx storage and reduction

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Journal of Hazardous Materials 2022年 431卷 128528-128528页

作者： Xie, Wen Xu, Guangyan Zhang, Yan Yu, Yunbo He, Hong State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341000 China

A mesoporous LaCoO3 perovskite oxide (LaCoO3-Meso) with three-dimensionally ordered helical interwoven structure was synthesized by a nano-casting method using KIT-6 as the hard template. The obtained LaCoO3-Meso with high surface area was tested for its catalytic performance in the NOx storage and reduction (NSR) reaction and compared with a sample synthesized by the conventional sol-gel method. The LaCoO3-Meso showed a significant advantage for NOx storage, with a NOx storage capacity 2 times higher than the regular sample. LaCoO3-Meso also exhibited improved NSR catalytic performance in the 150–450 °C temperature range, especially within 350–400 °C, where the NOx conversion was raised for 40%. The results of X-ray photoelectron spectroscopy and X-ray absorption fine structure measurements suggested the presence of a high concentration of oxygen defects on the LaCoO3-Meso surface. Further results provided by temperature programmed reduction and temperature programmed desorption indicated that the oxygen defects not only increase the amount of trapped NOx, but also improve the low-temperature redox performance of the catalyst. The lower stability of NOx species adsorbed on oxygen defects promotes the NOx release step in the NSR reaction and benefits the regeneration of storage sites. © 2022 Elsevier B.V.

关键词： Lanthanum compounds

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