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Abstract ：
Biological foaming is a major problem in activated sludge (AS) wastewater treatment systems. In this study, four wastewater treatment plants (WWTPs) (a total of six AS treatment systems) were investigated. The microscopic examination shows that foaming was mainly caused by gram-positive short branch microorganisms, sludge fragments, and/or other microorganisms, while the long unbranched filamentous was easy to cause bulking. The high throughput sequencing (HTS) and Linear discriminant analysis effect Size (LEfSe) identified the significant discrepancy of bacteria in foams compared to normal AS. Mycobacterium, Mycobacteriaceae, Nocardiaceae, Actinomycetales, Chryseobacterium, Flavobacterium, Ormithobacterium, Flavobacteriaceae, and Portibacter were considered as the dominant foaming-potential bacteria but not the most abundant bacteria in the foams. The excessive growth of foaming bacteria (including Haliscomentbacter, Saprospiraceae, and Tetrasphra) directly led to bulking with a high sludge volume index and was positively correlated with sludge retention time (SRT) and negatively correlated with dissolved oxygen (DO), which means long SRT and low DO may lead bulking instead of foaming. It also found that the foaming bacteria (including Skermania, Comamonadaceae, Cloacibacterium, Flavobacterium, and Chryseobacterium) had significant positive correlations with suspended solids and mixed liquid suspended solids, and negative correlations with temperature and DO concentration.
Keyword ：
bulking sludge bulking sludge foaming bacteria foaming bacteria high-throughput sequencing high-throughput sequencing mechanism of foaming mechanism of foaming wastewater treatment plants wastewater treatment plants
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| GB/T 7714 | Zhang, Xinying , Chen, Yihan , Yu, Chengzhi et al. Identifying Bacteria and Sludge Characteristics of Foaming Sludge in Four Full-Scale Wastewater Treatment Plants in Fujian Province, China [J]. | PROCESSES , 2025 , 13 (1) . |
| MLA | Zhang, Xinying et al. "Identifying Bacteria and Sludge Characteristics of Foaming Sludge in Four Full-Scale Wastewater Treatment Plants in Fujian Province, China" . | PROCESSES 13 . 1 (2025) . |
| APA | Zhang, Xinying , Chen, Yihan , Yu, Chengzhi , Lin, Linlin , Wang, Xin , Wang, Yongjing et al. Identifying Bacteria and Sludge Characteristics of Foaming Sludge in Four Full-Scale Wastewater Treatment Plants in Fujian Province, China . | PROCESSES , 2025 , 13 (1) . |
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Recently it has gained increasing concern for the treatment of fluoride wastewater by using flue gas desulfurization gypsum as adsorbent. However, to date the kinetic rules of the fluoride uptake by gypsum is still unclear, which would limit its practical applications. In this study, the fluoride removal kinetic curves are for the first time fitted with a revised pseudo-second-order model which was reported to be capable of obtaining more meaningful rate constant k'. It shows that k' varies little with the dose of the gypsum changed, and maintains at-0.02 L center dot g-1 center dot min-1 for the case of low concentration of fluoride (20 mg center dot L-1). However, it is more sensible to the concentration of fluoride (C0). The increase of C0 could lead to non-liner increase of k', indicating the changing in removal mechanism. Furthermore, it is found an obvious surface effect that the k' increases with the increase of the gypsum surface area. The pH effect on the removal kinetics is also explored, which shows higher k' value in the pH range of 7-9. By comparing to the removal curves that conducted with the direct homogeneous precipitation, it is proposed that the surface effect of gypsum would be more significant at low concentration of fluoride, while that of both gypsum and CaF2 would be involved at high concentration. The results of this work would be a good reference for the practical use of gypsum in the fluoride water treatment. Also it would shed light on the understanding of the fluoride uptake pathway by solid calcium reagents.
Keyword ：
FGD gypsum FGD gypsum Fluoride removal Fluoride removal Kinetic study Kinetic study Surface effect Surface effect
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| GB/T 7714 | Li, Xiaojuan , Shen, Hui , Pan, Xuefeng et al. Kinetic study of the fluoride removal by gypsum using revised pseudo-second-order model: Insights on the surface adsorption and precipitation [J]. | SURFACES AND INTERFACES , 2025 , 62 . |
| MLA | Li, Xiaojuan et al. "Kinetic study of the fluoride removal by gypsum using revised pseudo-second-order model: Insights on the surface adsorption and precipitation" . | SURFACES AND INTERFACES 62 (2025) . |
| APA | Li, Xiaojuan , Shen, Hui , Pan, Xuefeng , Zou, Zhiwei , Zhang, Hongxiang , Wang, Yongjing . Kinetic study of the fluoride removal by gypsum using revised pseudo-second-order model: Insights on the surface adsorption and precipitation . | SURFACES AND INTERFACES , 2025 , 62 . |
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以蒽醌2-磺酸钠盐(AQS)为外加电子介质,研究其在光合细菌(PSB)降解刚果红这一生物体系中的强化效果及机理.结果表明,PSB体系降解刚果红的最佳PSB投加量为50 mL(A=1.8),最佳AQS投加浓度为0.05 mmol·L-1.在PSB体系反应过程中添加AQS均对刚果红的脱色降解有促进作用,在0 h添加0.05 mmol·L-1 AQS的PSB体系平均脱色速率达3.63%·h-1,是空白对照组的2.47倍.AQS的加入能够缓解鱼藤酮对偶氮还原脱氢酶的抑制作用及双香豆素对醌还原酶的抑制作用,承担氧化还原中间体,为偶氮染料降解传递电子,提升降解速率.
Keyword ：
偶氮染料 偶氮染料 光合细菌 光合细菌 氧化还原介体 氧化还原介体 蒽醌类电子介质 蒽醌类电子介质
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| GB/T 7714 | 张新颖 , 邓丽思 , 陈钰婷 et al. 蒽醌类电子介质强化光合细菌降解偶氮染料 [J]. | 环境科学学报 , 2025 , 45 (3) : 145-155 . |
| MLA | 张新颖 et al. "蒽醌类电子介质强化光合细菌降解偶氮染料" . | 环境科学学报 45 . 3 (2025) : 145-155 . |
| APA | 张新颖 , 邓丽思 , 陈钰婷 , 陈娅 , 刘敏 , 王巧英 et al. 蒽醌类电子介质强化光合细菌降解偶氮染料 . | 环境科学学报 , 2025 , 45 (3) , 145-155 . |
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With the rapid growth of the demand for lithium-ion battery (LIBs), a large number of waste LIBs will be produced. If not disposed of properly, it will bring serious environmental pollution problems. The cathode materials of spent LIBs contain a large number of rare valuable metals, and the recovery of these metals will produce both environmental and economic benefits. Compared with the traditional separation, purification and recovery technologies of metal components from cathode materials, the strategy of direct regeneration of cathode materials has attracted much attention due to its advantages of simple process, low energy consumption, short recycling cycle and high added value of products. Six direct regeneration technologies for cathode materials from spent LIBs such as coprecipitation method, sol-gel method, solid phase sintering method, hydrothermal method, ion thermal/molten salt method and electrochemical repair method were reviewed and their advantages and disadvantages were also summarized. Among them, coprecipitation method and sol-gel method had some limitations in industrial application because of their relatively complex steps, high equipment requirements and reagent cost. Solid phase sintering method, hydrothermal method, ion thermal/molten salt method and electrochemical repair method had great opportunities for development because of their convenience and economy. In addition, the prospect and development trend of direct recycling of cathode materials from spent LIBs were prospected in order to provide reference for the research in the field of spent LIBs recycling. © 2024 Chemical Industry Press Co., Ltd.. All rights reserved.
Keyword ：
Bioreactors Bioreactors Bioremediation Bioremediation Coprecipitation Coprecipitation Energy efficiency Energy efficiency Lithium-ion batteries Lithium-ion batteries Palladium Palladium Recycling Recycling Sintering Sintering Sol-gel process Sol-gel process
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| GB/T 7714 | Li, Hongyan , Xie, Shuhan , Zhang, Yanru et al. Research progress on the direct regeneration technology for cathode materials from spent lithium-ion batteries [J]. | Chemical Industry and Engineering Progress , 2024 , 43 (9) : 5207-5216 . |
| MLA | Li, Hongyan et al. "Research progress on the direct regeneration technology for cathode materials from spent lithium-ion batteries" . | Chemical Industry and Engineering Progress 43 . 9 (2024) : 5207-5216 . |
| APA | Li, Hongyan , Xie, Shuhan , Zhang, Yanru , Wang, Yongjing , Wang, Yonghao , Lyu, Yuancai et al. Research progress on the direct regeneration technology for cathode materials from spent lithium-ion batteries . | Chemical Industry and Engineering Progress , 2024 , 43 (9) , 5207-5216 . |
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Fenton and Fenton-like reactions are common processes that usually occur during the oxidation of organic substrates. Unlike the Fe2+/H2O2 Fenton system of which the catalytic mechanisms are dominated by the production of center dot OH, that of FeIII Fenton-like system are to date still confusing. In this study, the activation of H2O2 was investigated by employing an FeIII based layered double hydroxide (MF-CO3) as the catalyst and phenol as the target. It reveals that the catalytic property of MF-CO3 is much superior than its counterpart of MF-Na synthesized with similar procedure. The investigation of phase structure and morphology indicate that MFCO3 possesses higher degree of crystallinity. The results of XPS, IR measurements suggest that CO32- content in MF-CO3 is obviously higher than that in MF-Na. Furthermore, the tests of free radicals reveal that center dot OH and 1O2 are the main ROSs generated during the activation process with HO2 center dot/O2 center dot- non-detectable, which was different from the previously reported Fenton/Fenton-like system in the presence of HO2 center dot/O2 center dot-. CO32- assisted hemolysis of H2O2 in the catalyst is proposed herein for an in-depth understanding of the interactions between surface FeIII and H2O2. It is suggested that the oxidation of FeIII intermediate to produce & sdot;OH is possibly one of the essential steps of activation. It is firstly reported for the positive impact of the CO32- on the activation mechanism of FeIII based catalyst. The results would give new insights for comprehending the FeIII Fenton-like process especially with the existence of CO32- which is a major inorganic species in water matrices.
Keyword ：
Carbonate assisted activation Carbonate assisted activation Fenton-like system Fenton-like system Layer double hydroxide Layer double hydroxide Phenol Phenol
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| GB/T 7714 | Wu, Shuang , Huang, Mengting , Li, Xinqin et al. Carbonate assisted activation Fe(III)-based fenton-like reagent layer double hydroxide [J]. | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 346 . |
| MLA | Wu, Shuang et al. "Carbonate assisted activation Fe(III)-based fenton-like reagent layer double hydroxide" . | SEPARATION AND PURIFICATION TECHNOLOGY 346 (2024) . |
| APA | Wu, Shuang , Huang, Mengting , Li, Xinqin , Lin, Weibin , Lu, Zhenghao , Wang, Yongjing . Carbonate assisted activation Fe(III)-based fenton-like reagent layer double hydroxide . | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 346 . |
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Spinel-type complex oxides are considered promising electrocatalysts, nevertheless, the mechanism of electrocatalytic reduction of O 2 to generate H 2 O 2 and to activate H 2 O 2 still needs to be further explored. In this work, the dependence of selectivity of electrocatalytic O 2 to generate H 2 O 2 and the efficiency of activating H 2 O 2 of defect sites in ZnFe 2 O 4 /CNT composites were investigated based on experimental data and characterization. Firstly, the ZnFe 2 O 4 /CNT composites were obtained by hydrothermal method combined with high-temperature calcination. Then phenol was used as a typical pollutant to evaluate its electrocatalytic performance. The results indicated that ZnFe 2 O 4 /CNT can degrade nearly 100% phenol of 20 mg/L and appears excellent TOC removal efficiency. Impedance experiments showed that the existence of CNT significantly promoted the electron transfer for ZnFe 2 O 4 /CNT. Raman spectroscopy and XPS analysis disclosed that the defect degree of CNT as well as oxygen vacancies of ZnFe 2 O 4 in the ZnFe 2 O 4 /CNT composites were higher than those of the individual CNT and ZnFe 2 O 4 , greatly facilitating the adsorption of O 2 . Consequently, more O 2 was reduced electrocatalytically to H 2 O 2 via the 2e process. Free radical quenching experiments and Fenton experiments showed that homogeneous and heterogeneous activation jointly promoted the conversion of H 2 O 2 to center dot OH. This work provides a strategy for the design of efficient electrocatalysts with spinel structures.
Keyword ：
Electrocatalytic oxygen reduction Electrocatalytic oxygen reduction Organic pollutant degradation Organic pollutant degradation Oxygen vacancy Oxygen vacancy
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| GB/T 7714 | Wang, Yonghao , Lu, Zhenghao , Wu, Shuang et al. Boosting electrocatalytic performance of ZnFe2O4/CNT via synergy of CNT defect and oxygen vacancies [J]. | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING , 2024 , 12 (3) . |
| MLA | Wang, Yonghao et al. "Boosting electrocatalytic performance of ZnFe2O4/CNT via synergy of CNT defect and oxygen vacancies" . | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 12 . 3 (2024) . |
| APA | Wang, Yonghao , Lu, Zhenghao , Wu, Shuang , Zou, Zhiwei , Zhang, Xinying , Wang, Yongjing . Boosting electrocatalytic performance of ZnFe2O4/CNT via synergy of CNT defect and oxygen vacancies . | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING , 2024 , 12 (3) . |
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随着锂离子电池(LIBs)需求量的急剧增长,必将产生大量废旧LIBs,如若处置不当,将带来严重的环境污染问题.废旧LIBs的正极材料中含有大量稀缺有价金属,对这些金属进行回收会产生环境和经济的双重效益.相较于传统的正极材料中金属组分的分离纯化回收技术,正极材料直接再生的策略因其具有工艺简单、能耗低、回收周期短、产品附加值高等优势而备受关注.本文综述了共沉淀法、溶胶-凝胶法、固相烧结法、水热法、离子热/熔盐法和电化学修复法6种废旧LIBs正极材料直接再生技术及其优缺点.其中共沉淀法和溶胶-凝胶法因其相对复杂的步骤、较高的设备要求和试剂成本,在工业化应用中具有一定的局限性;固相烧结法、水热法、离子热/熔盐法和电化学修复法因其便捷性和经济性,具有巨大的发展机会.同时展望了废旧LIBs正极材料直接再利用的前景和发展趋势,旨在为废旧LIBs回收领域研究提供参考.
Keyword ：
回收 回收 正极材料 正极材料 直接再生 直接再生 锂离子电池(LIBs) 锂离子电池(LIBs)
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| GB/T 7714 | 李红彦 , 谢书涵 , 张燕如 et al. 废旧锂离子电池正极材料直接再生技术研究进展 [J]. | 化工进展 , 2024 , 43 (9) : 5207-5216 . |
| MLA | 李红彦 et al. "废旧锂离子电池正极材料直接再生技术研究进展" . | 化工进展 43 . 9 (2024) : 5207-5216 . |
| APA | 李红彦 , 谢书涵 , 张燕如 , 王永净 , 王永好 , 吕源财 et al. 废旧锂离子电池正极材料直接再生技术研究进展 . | 化工进展 , 2024 , 43 (9) , 5207-5216 . |
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The chromium (Cr) pollution of soil has recently gained a lot of attention for the demand of environmental protection. One of its main resources is from the landfill of the chromium containing sludge (CCS) that produces from reduction-precipitation treatment of the Cr(VI) wastewater. In this work we provide an improved alkaline oxidation calcination (AOC) treatment for CCS, which achieves high Cr recovery efficiency at relatively low calcination temperature and oxygen-rich conditions. The leaching risk of the final residue is much reduced compared to the conventional calcination. It reveals that by using air flow the oxidation efficiency is effectively improved to a value of near to similar to 90 % at 450 degrees C. The thermal analyses of the reaction suggest that Cr (III) in CCS transforms to chromite at the temperature range of 340-450 degrees C, which ensure the subsequent oxidation. On the other hand, it reveals that at higher temperature ( 500 degrees C) it will produce Ca-Fe oxides which are confirmed to be dissolved in the leachate of the toxicity test. The concentration of Cr (III) increases obviously, which could be associated with the release of Cr(III) that doped into Ca-Fe oxides as solid solution. The transformations of the CCS components during the AOC process are depicted in detail. The method proposed here enables high oxidation efficiency of CCS and meanwhile avoids the environmental risk of final residue.
Keyword ：
Calcination Calcination Chromium containing sludge Chromium containing sludge Cr(III) oxidation Cr(III) oxidation Oxygen-rich Oxygen-rich Recovery Recovery
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| GB/T 7714 | Lin, Weibin , Xu, Yushan , Wu, Shuang et al. Oxygen-rich and moderate/low temperature calcination treatment of chromium containing sludge for high efficient Cr recovery and toxicity reduction [J]. | SURFACES AND INTERFACES , 2023 , 43 . |
| MLA | Lin, Weibin et al. "Oxygen-rich and moderate/low temperature calcination treatment of chromium containing sludge for high efficient Cr recovery and toxicity reduction" . | SURFACES AND INTERFACES 43 (2023) . |
| APA | Lin, Weibin , Xu, Yushan , Wu, Shuang , Qiu, Zhiwei , Yao, Hon , Wang, Yongjing et al. Oxygen-rich and moderate/low temperature calcination treatment of chromium containing sludge for high efficient Cr recovery and toxicity reduction . | SURFACES AND INTERFACES , 2023 , 43 . |
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Electrocatalytic reduction of nitrate to ammonia is an effective method for the recycling of NO3--N in the field of nitrate polluted water treatment. In this work, Co-N-C was prepared in this work by pyrolysis of Co-based metal organic framework at 700 degrees C and it can achieve 100 % selectivity to ammonia under the optimum experiment conditions. Impressively, no harmful nitrite generated in the reduction process because the reduction rate constant of Co-N-C for NO2- -N is higher than that of NO3- -N. Experiment results show that the chemical adsorption rather than electrostatic adsorption dominated among Co-N-C and free NO3- , which is significant for the subsequent electronic reduction process. Mechanism analysis indicated the active hydrogen (H*) reduction mechanism is predominate for Co-N-C but the direct electron mechanism is predominate for Co-C during the reduction from NO3- to NO2- . While for Co-N-C and Co-C, the subsequent reduction of NO3 to NH4+ was conducted by the direct electron mechanism. The present work not only explores high performance for the selectively electrocatalytic reduction from nitrate to ammonia but also promote new inspiration for the preparation of other Co-based functional materials for reducing the production of nitrite.
Keyword ：
Ammonia synthesis Ammonia synthesis Nitrate electroreduction Nitrate electroreduction Nitrate pollution Nitrate pollution The active hydrogen (H*) reduction The active hydrogen (H*) reduction
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| GB/T 7714 | Liu, Miao , Lu, Zhenghao , Yang, Linghan et al. Co-N bond promotes the H* pathway for the electrocatalytic reduction of nitrate (NO3RR) to ammonia [J]. | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING , 2023 , 11 (3) . |
| MLA | Liu, Miao et al. "Co-N bond promotes the H* pathway for the electrocatalytic reduction of nitrate (NO3RR) to ammonia" . | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 11 . 3 (2023) . |
| APA | Liu, Miao , Lu, Zhenghao , Yang, Linghan , Gao, Renmin , Zhang, Xinying , Wang, Yongjing et al. Co-N bond promotes the H* pathway for the electrocatalytic reduction of nitrate (NO3RR) to ammonia . | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING , 2023 , 11 (3) . |
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Arsenic existed concomitantly with minerals containing precious or non-ferrous metals, in which arsenic -containing wastewater (ACW) is inevitably generated during the process of smelting. In the treatment of ACW, the precipitation method using sulphide is widely used, but the resulting arsenic sulphide slag poses a risk of secondary pollution. In this work, a reduction strategy was developed to transform arsenic sulphide slag into elementary arsenic under hydrothermal conditions by using sodium formate as the reductant, with the aim to treat the slag and recycle As. The experimental results show that As(0) can be obtained by one-step hydrothermal reduction by sodium formate at temperature of 200 celcius and pH 4, and the purity of elementary arsenic produced under the optimum conditions is higher than 90%. Mechanism analyses reveal that the reduction process of As2S3 to As(0) experiences two steps, where amorphous As2S3 primary particles first transform and crystallize into partially reductive AsS in a bulk size, and then AsS is further reduced into As(0) through a collapse process to form small particles. This work provides a recycling strategy for the efficient conversion of arsenic sulphide slag to As(0) for potential applications.
Keyword ：
Arsenic sulphide slag Arsenic sulphide slag Hydrothermal method Hydrothermal method Recycle Recycle Reduction reaction Reduction reaction
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| GB/T 7714 | Wang, Yonghao , Liu, Youmei , Shi, Jian et al. Treatment and recycling of arsenic slag by hydrothermal reduction of As2S3 to As(0) [J]. | PROCESS SAFETY AND ENVIRONMENTAL PROTECTION , 2023 , 174 : 933-940 . |
| MLA | Wang, Yonghao et al. "Treatment and recycling of arsenic slag by hydrothermal reduction of As2S3 to As(0)" . | PROCESS SAFETY AND ENVIRONMENTAL PROTECTION 174 (2023) : 933-940 . |
| APA | Wang, Yonghao , Liu, Youmei , Shi, Jian , Li, Mingyang , Wang, Yongjing , Zhang, Jing . Treatment and recycling of arsenic slag by hydrothermal reduction of As2S3 to As(0) . | PROCESS SAFETY AND ENVIRONMENTAL PROTECTION , 2023 , 174 , 933-940 . |
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