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Removal of phosphate from wastewater using alkaline residue

Journal of Environmental Sciences 2014年第5期26卷 970-980页

作者： Yubo Yan Xiuyun Sun Fangbian Ma Jiansheng Li Jinyou Shen Weiqing Han Xiaodong Liu Lianjun Wang Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology

Alkaline residue （AR） was found to be an efficient adsorbent for phosphate removal from wastewater. The kinetic and equilibrium of phosphate removal were investigated to evaluate the performance of modified alkaline residue. After treatment by NaOH （AR-NaOH）, removal performance was significantly improved, while removal performance was almost completely lost after treatment by HCI （AR-HC1）. The kinetics of the removal process by all adsorbents was well characterized by the pseudo second-order model. The Langmuir model exhibited the best correlation for AR-HC1, while AR was effectively described by Freundlich model. Both models were well fitted to AR-NaOH. The maximum adsorption capacities calculated from Langmuir equation were in following manner： AR-NaOH 〉 AR 〉 AR-HC1. Phosphate removal by alkaline residue was pH dependent process. Mechanisms for phosphate removal mainly involved adsorption and precipitation, varied with equilibrium pH of solution. For AR-HCI, the acid equilibrium pH （〈 6.0） was unfavorable for the formation of Ca-P precipitate, with adsorption as the key mechanism for phosphate removal. In contrast, for AR and AR- NaOH, precipitation was the dominant mechanism for phosphate removal, due to the incrase on pH （〉 8.0） after phosphate removal. The results of both XRD and SEM analysis confirmed CaHPOa.2H20 formation after phosphate removal by AR and AR-NaOH.

关键词： alkaline residue chemical modification phosphate removal adsorption precipitation

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Simultaneous pyridine biodegradation and nitrogen removal in an aerobic granular system

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Journal of Environmental Sciences 2018年第5期30卷 318-329页

作者： Xiaodong Liu Shijing Wu Dejin Zhang Jinyou Shen Weiqing Han Xiuyun Sun Jiansheng Li Lianjun Wang Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and Technology

Simultaneous pyridine biodegradation and nitrogen removal were successfully achieved in a sequencing batch reactor（SBR） based on aerobic granules. In a typical SBR cycle, nitritation occurred obviously after the majority of pyridine was removed, while denitrification occurred at early stage of the cycle when oxygen consumption was aggravated. The effect of several key operation parameters, i.e., air flow rate, influent NH4~＋-N concentration,influent p H and pyridine concentration, on nitritation, pyridine degradation and total nitrogen（TN） removal, was systematically investigated. The results indicated that high air flow rate had a positive effect on both pyridine degradation and nitritation but a negative impact of overhigh air flow rate. With the increase of NH4~＋ dosage, both nitritation and TN removal could be severely inhibited. Slightly alkaline condition, i.e., pH 7.0–8.0, was beneficial for both pyridine degradation and nitritation. High pyridine dosage often resulted in the delay of both pyridine degradation and nitritation. Besides, extracellular polymeric substances production was affected by air flow rate, NH4~＋ dosage, pyridine dosage and p *** addition, high-throughput sequencing analysis demonstrated that Bdellovibrio and Paracoccus were the dominant species in the aerobic granulation system. Coexistence of pyridine degrader, nitrification related species, denitrification related species, polymeric substances producer and self-aggregation related species was also confirmed by highthroughput sequencing.

关键词： Aerobic granule Biodegradation Nitritation Denitrification Pyridine

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EFFECT OF HYPERCROSSLINKED RESINS SURFACE CHEMISTRY ON THE ADSORPTION OF PHENOL FROM AQUEOUS SOLUTION

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Chinese Journal of Polymer Science 2006年第6期24卷 585-591页

作者： Guan-hua Meng Ai-min Li Wei-ben Yang Fu-qiang Liu Quan-xing Zhang State Key Laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing University Nanjing 210093 China Engineering Technology Research Center of Organic Toxie Substance Control and Resource Reuse of Jiangsu Province Nanjing 210038 China

Two hypercrosslinked resins with similar physical characters but different surface chemistry were synthesized and used to remove phenol from aqueous solutions. The FTIR spectra, elemental analysis and the Boehm titration were used to characterize the chemical properties of the resins. The adsorption experiments were carried out using the bottle-point technique, and the effects of the surface chemistry on the adsorption were discussed. The adsorption data fit well with the Freundlich model, indicating the heterogeneity of the resins surface. It could be seen from the experimental results that the adsorption capacity increased with the increase in the total surface concentration of oxygen-containing groups. The pH dependence and the effects of ionic strength were also discussed. The kinetic adsorption data fit well with the pseudo-second order model, and the results showed that the surface oxygen-containing groups have little effect on the adsorption rate.

关键词： Hypercrosslinked resin Phenol Surface chemistry Adsorption isotherm Kinetic study.

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Enhanced selective recovery of powder carrier-supported biofilms for enrichment of denitrifying functional bacteria

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Water Research X 2025年 28卷

作者： Wang, Chengxian Lu, Bin Wu, Boran Chen, Jin Wu, Zhigen Han, Hongbo Dai, Xiaohu Chai, Xiaoli Hu, Dian Shandong Engineering Research Center for Biogas Qingdao New Energy Shandong Laboratory Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao266101 China State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University 1239 Siping Road Shanghai 200092 China Hunan Sanyou Environmental Protection Co. Ltd. Changsha410205 China School of International Liberal Studies Waseda University Tokyo 1690051 Japan

An innovative integrated fixed-film activated sludge (IFAS) system using high-concentration powder carriers was developed to promote microbial growth and optimize community distribution, achieving high efficiency denitrification in municipal wastewater. A critical challenge remains the efficient recovery of carrier biofilm from activated sludge. In this study, multi-layer density gradient centrifugation was employed to characterize the biochemical characteristics and microbial distribution patterns of sludge. Under the optimal cyclone inflow velocity of 3.5 ± 0.5 m/s, the aged cell can efficiently be detached from biofilm sludge via the cyclone separation unit, increased the proportion of live cells by 20 %. The cyclone separation unit can also successfully separate suspended and biofilm sludge, enriching denitrifying bacteria in the underflow sludge and phosphate accumulating organisms (PAOs) in overflow sludge. Compared to overflow sludge, underflow sludge (biofilm) exhibited a 33 % increase in particle size and a 0.51-fold increase in denitrification rate constants, leading to improvements of nitrogen and phosphorus removal efficiencies exceeding 73 %. This study proposes a novel strategy for precise regulation of dual sludge ages, addressing the contradiction between the long generation cycles of denitrifying microorganisms and the short generation cycles of PAOs. These findings provide valuable insights for the targeted enrichment of denitrifying microorganisms within carrier biofilm, enhancing denitrification and phosphorus removal during the expansion and upgrading of municipal wastewater treatment plants. © 2025

关键词： Biofilms

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Erratum to:Formation mechanism of electroless plating nickel-based composite coating on highly active rare earth magnesium alloys and its corrosion resistance and adhesion performance

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Journal of Central South University 2025年第2期32卷 692-692页

作者： WANG Bo LI Jia-wei XIE Zhi-hui LIU Kang XU Tao YU Gang College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410012China Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province China West Normal UniversityNanchong 637002China Central South University of Forestry and Technology Changsha 410004China

Because of an unfortunate mistake by authors,the Project(5227010679)of Foundation item was *** corrected Project is shown as follows:Project(52271073).

关键词： adhesion performance electroless plating highly active rare earth magnesium alloys nickel based composite coating corrosion resistance

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Highly efficient desorption and reuse of fatty acid collectors adsorbed on mineral surface: A case study of scheelite

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International Journal of Minerals,Metallurgy and Materials 2025年第06期 1286-1296页

作者： Liming Tao Wangni Wu Zihan Zhao Ruihua Fan Jianjun Wang Zhiyong Gao School of Minerals Processing and Bioengineering Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral ResourcesHunan International Joint Research Center for Efficient and Clean Utilization of Critical Metal Mineral ResourcesEngineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and UtilizationCentral South University Institute of Multipurpose Utilization of Mineral Resource Chinese Academy of Geological Sciences The Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control Ministry of Ecology and EnvironmentWuhan University of Science and Technology

Flotation is the most common method to recover valuable minerals by selective adsorption of collectors on target mineral surfaces. However, in subsequent hydrometallurgy of mineral flotation concentrates, the adsorbed collectors must be desorbed since it can adversely affect the efficiency of metallurgical process and produce wastewater. ZL, as a fatty acid mixture, is a typical industrially used collector for scheelite flotation in China. Sodium oleate(NaOL) has similar fatty acid group as ZL. In this study, the desorption behavior of NaOL/ZL from scheelite surface by a physical method of stirring at a low temperature was investigated. NaOL desorption tests of single mineral showed that a desorption rate of 77.75% for NaOL from scheelite surface into pulp was achieved in a stirring speed of2500 r/min at 5°C in a neutral environment. Under the above desorption condition, in the pulp containing desorbed collector by adding extra 30% normal NaOL dosage, the scheelite recovery reached about 95% in the single mineral flotation test. Desorption and reuse of ZL collector for the flotation of real scheelite ore showed only a 75% normal dosage of ZL could produce a qualified rough concentrate. The atomic force microscope(AFM) tests showed that after desorption treatment of low temperature and strong stirring, the dense strip-like structure of NaOL on the scheelite surface was destroyed to be speck-like. Molecular dynamics simulations(MDS) demonstrated that the adsorption energy between NaOL and scheelite surface was more negative at 25°C(-13.39 kcal/mol) than at 5°C(-11.50 kcal/mol) in a neutral pH, indicating that a low temperature was beneficial for the desorption of collector from mineral surface. Due to its simplicity and economy, the method we proposed of desorption of collector from mineral surface and its reuse for flotation has a great potential for industrial application.

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Coupled biodegradation of p-nitrophenol and p-aminophenol in bioelectrochemical system:Mechanism and microbial functional diversity

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Journal of Environmental Sciences 2021年第10期33卷 134-144页

作者： Jianjun Luo Yuxi Xu Jing Wang Libin Zhang Xinbai Jiang Jinyou Shen Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China

Biodegradation mechanisms and microbial functional diversity during coupled pnitrophenol(PNP)and p-aminophenol(PAP)degradation were studied in a bioelectrochemical *** in the biocathode and PAP in the bioanode were almost completely removed within 28 hr and 68 hr *** degradation followed the steps including hydrating hydroxyalkylation,dehydrogenating carbonylation,and hydrolating ring cleavage,*** analysis based on the KEGG and egg NOG database annotations revealed the microbial composition and functional genes/enzymes related to phenol degradation in the *** predominant bacteria genera were Lautropia,Pandoraea,Thiobacillus,Ignavibacterium,Truepera and *** recognized biodegradation genes/enzymes related to pollutant degradation were as follows:pmo,hbd,&ppo for phenol degradation,nzba,amie,&badh for aromatic degradation,and CYP&p450 for xenobiotics degradation,*** co-occurrence of ARGs(antibiotic resistant genes),such as ade F,Mex J,Erm F,PDC-93 and Escherichiacolimdf A,etc.,were annotated in CARD database during the biodegradation *** Proteobacteria&Actinobacteria phylum was the primary host of both the biodegradation genes&ARGs in this *** microbial functional diversity ensured the effective biodegradation of the phenol pollutants in the bioelectrochemical system.

关键词： Phenols biodegradation Functional diversity Functional gene Metagenome

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Comprehensive assessment of the microbial community structure in a typical lead–zinc mine soil

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Environmental Science and pollution Research 2024年 1-14页

作者： Zeng, Taotao Sha, Haichao Xie, Qingqing Lu, Yue Nong, Haidu Wang, Liangqin Tang, Lin Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology University of South China Hunan Hengyang421001 China College of Environmental Science and Engineering Hunan University Changsha410082 China Ministry of Education Hunan Changsha410082 China

Understanding the microbial community structure in soil contaminated with heavy metals (HMs) is a precondition to conduct bioremediation in mine soil. Samples were collected from a typical lead–zinc (Pb–Zn) mine to assess the microbial community structure of the HMs concentrated in the soil. The goal was to analyze the bacterial and fungal community structures and their interactions using the 16S rRNA genes and internal transcribed spacer high-throughput sequencing. Analyses at different sampling sites showed that contamination with HMs significantly reduced the bacterial richness and diversity but increased that of the fungi. The predominant bacteria genera of Acidobacteriales, Gaiellales, Anaerolineaceae, Sulfurifustis, and Gemmatimonadaceae, and predominant fungal genera of Sordariomycetes, Talaromyces, and Mortierella were assumed as HM resistant genera in Pb–Zn mining area. The pH effect on the bacterial and fungal communities was opposite to those of Cd, Pb, and Zn. This study offers comprehensive outlooks for bacterial and fungal community structures upon multiple HM stresses in the soil around a typical Pb–Zn mine area. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Heavy metals

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Study on the complexation of 5,11,17,23,29,35- hexacarboxy-37,38,39,40,41,42-hexa-methoxy-hydroxamic calixarene extraction of metal ions

Study on the complexation of 5,11,17,23,29,35- hexacarboxy-3...

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4th International Conference on Advanced Engineering Materials and technology, AEMT 2014

作者： Zhou, Jie Wang, Jing Song Li, Xia Fang, Feng Rong Key Laboratory of Pollution Control and Resource Reuse of Hunan Province Hengyang Hunan 421001 China

ISBN: (纸本)9783038352068

The complexation abilities of 5,11,17,23,29,35-hexacarboxy-37,38,39,40,41,42- hexa-methoxy-hydroxamic calyx [6]arene extraction of metal ions (Cu2+, Ni2+, Na+, Fe3+, Cd3+, Mn2+, Pb2+) were studied. And the complexation ration of Cu2+ and Pb2+ were obtained by Job's method. The selective removal of Cu2+ (Pb2+) coexisting with alkali metals ions (Na+, K+) and alkaline earth metal ions (Ca2+, Mg2+), heavy metal ions (Zn2+, Mn2+, Pb2+(Cu2+), Ni2+) and anions (CO3 2-, C2O4 2-, SO4 2-, NO3 -) were studied separately. The results revealed that the percent of Cu2+(Pb2+) removal in the presence of alkali metals ions and alkaline earth metal ions was over 83.8% (90%) and in the presence of anions was over 90.1% (81.3%) while the percent of Cu2+(Pb2+) removal in the presence of heavy metal ions was lower than 70.6% (70.0%), and the minimum percent of Cu2+(Pb2+) removal in the presence of heavy metal ions was 32.7% (61.2. © (2014) Trans Tech Publications, Switzerland.

关键词： Extraction

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1H-1,2,4-Triazole biodegradation by newly isolated Raoultella sp.: A novel biodegradation pathway

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Bioresource technology Reports 2019年 6卷 63-69页

作者： Liu, Xiaolin Wang, Jing Chen, Dan Jiang, Xinbai Wu, Haobo Hou, Cheng Zhang, Dejin Liu, Xiaodong Wang, Lianjun Shen, Jinyou Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology NanjingJiangsu Province210094 China

In this study, a novel 1H-1,2,4-triazole (TZ) degrading strain was isolated from activated sludge acclimated by TZ and was identified as Raoultella sp. The biodegradation test showed that Raoultella sp. could utilize TZ as the sole carbon and nitrogen source. TZ was completely removed at incubation temperature of 30 °C, initial pH of 7.0 and initial concentration of 100 mg L−1 within 288 h, which was accompanied by obvious TOC removal, NH4+ release, pH increase, biomass growth, biotoxicity reduction and excitation emission matrix (EEM) variation. TZ biodegradation profile by Raoultella sp. was well fitted by the first-order degradation kinetic model, confirming the inhibitory nature of TZ. Based on HPLC/MS analysis, a distinct TZ biodegradation pathway including hydroxylation, carbonylation, carboxylation and ring cleavage, was proposed for the first time. Compared with other TZ degrading species such as Shinella sp., Raoultella sp. showed relatively higher TZ removal efficiency, demonstrating great potential for the application in biological treatment of wastewater containing TZ in practice. © 2019 Elsevier Ltd

关键词： Biodegradation

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