Article
Engineering, Environmental
Xin Feng, Junjie Wan, Jinchuan Deng, Xiu Yue, Yulong Yang, Zhanlong He, Xiaohui Fang, Tulan Chen, Shumin Li, Jiankai Lu, Yaoguo Long
Summary: This study used the UV-light-initiated aqueous micellar polymerization method to obtain hydrophobic associating cationic polyacrylamide (HACPAM) as a flocculant and coupled it with quartz sand and fly ash to investigate sludge flocculation and dewatering. The results showed that the larger the molecular weight of HACPAM, the better the dehydration performance. When HACPAM was coupled with quartz sand and fly ash flocculated sludge, the low-dose HACPAM 3 coupled with fly ash showed better dehydration effects.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Environmental Sciences
Nianping Chi, Jiajun Liu, Minghua Lei, Li Feng
Summary: The introduction of amphiphilic CPAM TP-ADB with cationic microblock structure and hydrophobic association improves the dewatering performance of PD sludge.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Yuning Chen, Xuhao Li, Wang Zizeng, Li Feng, Jiehong Xie, Zeluan Lin, Zhihong Xu, Bingzhi Liu, Xiang Li, Huaili Zheng
Summary: The research successfully synthesized a new type of template copolymer with a distinct cationic microblock structure, which can effectively improve the flocculation structure and enhance treatment efficiency, leading to an improved sludge dewatering performance.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Multidisciplinary Sciences
Pan Hu, Shaohang Shen, Hu Yang
Summary: This study investigated the sludge dewatering performance of two series of binary graft cationic starch-based flocculants with different hydrophilicity and charge density. With increased charge density and moderate hydrophobicity, the dewaterability of sludge was found to improve, resulting in lower filter cake moisture content and resistance to filtration. The structure-activity relationship of these flocculants was evaluated quantitatively using a second-order polynomial model.
SCIENTIFIC REPORTS
(2021)
Article
Biochemistry & Molecular Biology
Yongli Lv, Sheng Zhang, Yunshan Zhang, Hongyao Yin, Yujun Feng
Summary: HAPAM w/w emulsions prepared through aqueous dispersion polymerization have excellent stability, solubility, and rheological properties, making them suitable for various applications.
Article
Environmental Sciences
Bing Guo, Jiachen Zeng, He Bai, Yuchi Hao, Xiaowei Yan, Sheng Wang
Summary: This study investigated the effect of cation polyacrylamide (CPAM) on the dewatering performance of dredged sludge and compared it with other organic and inorganic agents. The results showed that CPAM significantly improved the dewatering performance, reducing sludge resistance filtration and capillary adsorption time. Mechanism experiments revealed that CPAM achieved this by increasing sedimentation rate, accelerating organic matter dissolution, neutralizing sludge surface charge, and improving void structure. CPAM outperformed other agents in terms of dewatering performance.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Ocean
Umit Karadogan, Gokhan Cevikbilen, Sevde Korkut, Mehmet Emin Pasaoglu, Berrak Teymur
Summary: This study introduces an efficient dewatering method by using geotextile tubes filled with sludge, which involves modifying and optimizing the dosage of anionic polyacrylamide to achieve successful dewatering and filtration. The discharge of filtrate into the aquatic medium meets the standards after undergoing filtration.
MARINE GEORESOURCES & GEOTECHNOLOGY
(2022)
Article
Polymer Science
Lei Wang, Pei Huang, Lei Huang, Chuanshuang Chen, Meiwei Qi, Wenfeng Jiang, Chunyang Yu, Shaodong Zhang, Yongfeng Zhou
Summary: A metal-free and visible light-initiated living cationic dark polymerization system has been demonstrated, which exhibits living characteristics and has potential for industrial applications.
Article
Chemistry, Physical
Anqi Du, Jincheng Mao, Heng Zhang, Tao Xu, Xiaojiang Yang, Chong Lin, Yang Zhang, Jun Liu
Summary: A novel twin-tailed amphiphilic monomer named CGS-12 was synthesized and copolymer GHPAM was prepared by photoinitiated free radical polymerization. GHPAM showed better performance at high temperature, exhibited unusual salinity sensitivity, and tolerated greater shear forces. CGS-12 enhanced hydrophobic association compared to DM-12 while maintaining the same hydrophobic chains content, resulting in improved rheological properties.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Polymer Science
Kai Yang, Jianqi Sun, Hongning Liu, Weichao Yang, Lei Dong
Summary: With the increase in sewage-sludge production, the pyrolytic disposal method has gained attention. Cationic polyacrylamide (CPAM) and sawdust were used to enhance the dehydration process, resulting in reduced moisture content. The addition of sawdust improved volatile substance release and reduced activation energy during pyrolysis. Apparent activation energies ranged from 135.3 kJ/mol to 174.8 kJ/mol, and the nucleation-and-growth model was identified as the most appropriate mechanism function.
Article
Environmental Sciences
Pan Hu, Shaohang Shen, Donghua Zhao, Hua Wei, Jun Ge, Feiyue Jia, Xiangxiang Zhang, Hu Yang
Summary: CS-DMRs, hydrophobically associated cationic starch-based flocculants, improve sludge dewaterability by efficiently interacting with EPS, reducing filter cake moisture content and specific resistance to filtration, and forming drainage channels and net-like porous structures in the sludge cake.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Biochemistry & Molecular Biology
Fei Yi, Bo Huang, Chengsheng Wang, Xiaoxu Tang, Xiujun Wang, Quangang Liu, Yanhui Su, Shijia Chen, Xiaoyan Wu, Bin Chen, Jing Zhang, Dianguo Wu, Shuai Yu, Yujun Feng, Xin Su
Summary: Compared to China's overall oil reserves, the reserve share of offshore oilfields is quite significant. However, the offshore oilfield environment poses challenges for polymer use, requiring polymers with specific properties. This study explores a novel hydrophobically associating polymer (HAP) for polymer flooding in offshore oilfields, which exhibits improved solubility, thickening ability, and salt resistance compared to conventional polyacrylamide (HPAM) with equivalent molecular weight. The results show that HAP has the potential to enhance oil recovery in porous media.
Article
Engineering, Chemical
Long Xu, Xu Liu, Ziqing Liu, Pengcheng Li, Hongyu Ding, Houjian Gong, Mingzhe Dong
Summary: This study investigates the oil washing mechanism of hydrophobically associating polyacrylamide (HAHPAM) in chemical flooding by analyzing its extensional rheology. The results show that HAHPAM solution has better extensibility compared to partially hydrolyzed polyacrylamide (HPAM), especially at high temperature and salinity. Factors such as concentration, temperature, NaCl, and surfactant affect the filament breakup time and extensional viscosity of HAHPAM solution.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Chemical
Yingxue Wu, Xianhong Zhang, Dong Chen, Yuhong Ma, Qin Wang, Jiadong Wang, Wantai Yang
Summary: A novel type of water-soluble macromolecular photoinitiators was designed and synthesized for the preparation of water-soluble branched polymers, showing excellent solubility and unique rheological properties. The photoinitiators displayed remarkable photoinitiating efficiency, making them potential effective photoinitiators for water-soluble polymers with a defined branched structure.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Engineering, Environmental
Liqiang Duan, Zhen Zhou, Xiaohu Dai
Summary: This study investigated the conditioning effect of CPAM with different charge densities on RS and HS, revealing that thermal hydrolysis can improve sludge dewatering performance. Thermal hydrolysis can lysis microbial cells in sludge, while sludge treated with ferric salt will have more porous structure and stronger flocculation strength.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Xi Li, Shiwen Wang, Xiao Zhang, Danhua Mei, Yanhua Xu, Peng Yu, Yongjun Sun
Summary: Ultrasmall TiO2 nanoparticles were encapsulated inside ZIF-8 to form a highly efficient TiO2@ZIF-8 catalyst. The catalyst showed high efficiency in toluene removal under nonthermal plasma conditions, with good stability and ozone decomposition efficiency. This work provides a new approach for synthesizing high-performance VOC catalysts.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Yicheng Wang, Yingkun Wang, Xi Lu, Wenquan Sun, Yanhua Xu, Jun Zhou, Yongjun Sun
Summary: In this study, an Mn/Ce@red mud catalyst was prepared and successfully used for the degradation of coal chemical biochemical tail water. The Mn and Ce were loaded onto the catalyst, improving its pore structure. The hydroxyl radicals played a leading role in the degradation process, while the adsorption of red mud and direct oxidation of ozone played a secondary role.
Article
Chemistry, Physical
Shengping Cao, Lei Chen, Minyan Zhao, Ankang Liu, Mingxiu Wang, Yongjun Sun
Summary: Conventional pretreatment and secondary biochemical treatment are ineffective in removing phosphorus from phosphorus-containing pesticide wastewater. In this study, coagulation-coupled ozone catalytic oxidation was used to treat the secondary biochemical tailwater from such wastewater. The results showed that a combination of coagulation and ozone catalytic oxidation effectively removed COD, TP, and chromaticity from the wastewater, indicating great potential for application in treating this type of wastewater.
Article
Environmental Sciences
Jiahua Xia, Ting Rao, Juan Ji, Bijuan He, Ankang Liu, Yongjun Sun
Summary: The study investigated the performance of fly ash, polymerized aluminum chloride (PAC), and polymer sulfate (PFS) as conditioners for sludge dewatering. It was found that the composite regulation method could improve the dewatering efficiency of the sludge. The coupling of fly ash with PAC or PFS was considered to be a promising environmentally-friendly combined conditioning method.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Article
Chemistry, Physical
Guangzhen Zhou, Yanhua Xu, Xiao Zhang, Yongjun Sun, Cheng Wang, Peng Yu
Summary: This study investigated the degradation of ibuprofen using a cobalt catalyst fixed on carbon balls. The catalyst exhibited a degradation rate of over 70% in one hour, surpassing the performance of persulfate and resin carbon balls alone. The major oxidizing components responsible for the degradation were found to be SO4- and center dot OH. The material offers advantages such as simple preparation, low cost, convenient recovery, and efficient degradation of organic pollutants.
Review
Environmental Sciences
Jiahua Xia, Juan Ji, Zhiqiang Hu, Ting Rao, Ankang Liu, Jingqian Ma, Yongjun Sun
Summary: Sludge dewatering, an important step in sludge treatment, is often ineffective without conditioning. Advanced oxidation technology improves sludge dewatering, reduces capacity, and removes micro-pollutants, benefiting post-treatment and disposal. This article systematically explains the characteristics of advanced oxidation for sludge dehydration, including different free radical reaction mechanisms and dehydration conditions, and extensively discusses the effects of advanced oxidation technologies on sludge conditioning and dewatering. The future prospects of applying advanced oxidation technology in sludge conditioning and dewatering are also presented.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Article
Environmental Sciences
Wenquan Sun, Shuqian Xie, Yongjun Sun, Xiangtao Qiu, Jun Zhou
Summary: In this study, Mn/Zn@ palygorskite (PG) catalysts were prepared and the optimal working conditions for catalytic oxidation treatment of coal chemical wastewater were determined. The abrasion resistance and catalytic performance of the catalyst were investigated after repeated use, and the mechanism of the loss of active components was explored. The wastewater was analyzed before and after treatment using various techniques, and an evaluation system was established to assess the overall performance of the catalytic ozonation process.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Article
Environmental Sciences
Pan Zhang, Zhaoyang You, Tianfang Chen, Li Zhao, Jianguo Zhu, Weihong Shi, Qinwei Meng, Yongjun Sun
Summary: In this study, a high-efficiency petroleum hydrocarbon-degrading bacterium MX1 was screened from petrochemical wastewater sludge, and its mutant strain MXM3U2 was obtained via microwave-ultraviolet composite mutagenesis technology. The results showed that both MX1 and MXM3U2 strains had good degradation effects on petroleum hydrocarbons.
Article
Environmental Sciences
Shengping Cao, Weiwei Jiang, Minyan Zhao, Ankang Liu, Mingxiu Wang, Qu Wu, Yongjun Sun
Summary: The study showed that the pretreatment of alkaline digestion + ozone oxidation effectively removed volatile phenols and phenolic organic pollutants from resin production wastewater. The average removal rates of COD, TN, and NH3-H (ammonia nitrogen) were 91.96%, 85.35%, and 85.67%, with average concentrations of final biochemical effluent being 404.7, 21.4, and 11.4 mg/L, respectively.
Review
Environmental Sciences
Yankai Liang, Rui Wang, Wenquan Sun, Yongjun Sun
Summary: This article analyzes the composition and properties of municipal sludge and examines the factors affecting its dewatering performance. It introduces various chemical conditioning methods and systematically analyzes the principles and applications of existing sludge conditioning technologies. It emphasizes the importance of developing a more appropriate combination of sludge conditioning and dewatering processes and optimizing the dewatering process by developing new efficient and environmentally friendly sludge conditioning agents.
Article
Environmental Sciences
Jinlong Wang, Rui Wang, Jingqian Ma, Yongjun Sun
Summary: The study demonstrated that SAC has efficient adsorption capacity for methylene blue dye and ofloxacin antibiotic, with electrostatic interactions being the main adsorption mechanism. By adjusting the solution pH and removing specific ions, the removal efficiency can be enhanced. Additionally, SAC retains high adsorption capacity even after multiple regenerations, showing potential as a replacement for traditional activated carbon in removing new pollutants.
Article
Environmental Sciences
Cheng Wang, Guangzhen Zhou, Yanhua Xu, Peng Yu, Yongjun Sun
Summary: The study utilized D001 resin as the source of carbon material and catalyst carrier, adsorbing cobalt ions and mixing with dicyandiamide and carbon balls to form N-Co/D001CB. The catalyst showed high catalytic activity in degrading refractory organic pollutants.
Article
Environmental Sciences
Jinlong Wang, Jingqian Ma, Yongjun Sun
Summary: Coal-based activated carbon is effective in treating high-salt printing and dyeing wastewater, but the presence of high salt can inhibit the adsorption of methylene blue by the CBAC. Factors such as dosage, concentration, coexisting ions, and pH value can influence the adsorption process and performance of CBAC with methylene blue.
Review
Environmental Sciences
Lei Guo, Yiming Xie, Wenquan Sun, Yanhua Xu, Yongjun Sun
Summary: This paper summarizes the source, water quality characteristics, and environmental impact of high-salinity wastewater, and introduces the desalination and treatment technologies of high-salinity wastewater. The desalination technology mainly includes concentration and crystallization processes, aiming at the recovery of salt. Advanced treatment technologies such as physicochemical and biological treatment, as well as coupling treatment, are also analyzed. The effect of high salinity on different treatment processes is evaluated, and suggestions for further research and improvement are proposed.
Article
Engineering, Environmental
Xiao Zhang, Xi Li, Peng Yu, Ying Yu, Xiulei Fan, Jiankun Zhang, Yang Yu, Huaili Zheng, Yongjun Sun
Summary: This study developed a metal-free nanotubular carbon nitride photocatalyst that can activate oxygen to degrade organic contaminants in a low-cost and sustainable manner. The nanotube structure enables sufficient oxygen adsorption, while the optical and photoelectrochemical properties facilitate efficient charge transfer to activate oxygen. The developed system successfully degraded various organic contaminants and mineralized 40.7% of chloroquine phosphate within 100 minutes. It reduced the toxicity and environmental risk of treated contaminants and saved energy and chemical reagents, resulting in reduced operating costs.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
