Article
Environmental Sciences
Jianhai Zhao, Bo Li, Anmin Wang, Wenqi Ge, Wenpu Li
Summary: This study investigated the flocculation floc formation and growth processes using magnesium hydroxide and polyacrylamide (PAM) dual-coagulant through controlled experiments. The results showed that the addition of PAM and the generation of magnesium hydroxide affected the formation and growth of flocs, improving the coagulation performance.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Environmental Sciences
Xiaoli Deng, Jianhai Zhao, Xiuming Qiu, Yingying Duan, Xiaoyu Ren, Wenpu Li, Rong Mu, Hongying Yuan
Summary: Magnesium hydroxide has been successfully used for alkaline reactive dye wastewater treatment, but for a wider range of pH values, magnesium hydroxide slurry has the advantage of buffer action. In this study, magnesium hydroxide slurry and non-ionic polyacrylamide (PAM) were used to remove reactive orange dye in aqueous solution. The results show that magnesium hydroxide slurry performs well for reactive orange removal and floc sedimentation in the pH range of 5-12.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Engineering, Environmental
Yingying Duan, Jianhai Zhao, Xiuming Qiu, Xiaoli Deng, Xiaoyu Ren, Wenqi Ge, Hongying Yuan
Summary: This study investigates the coagulation performance and mechanisms of removing reactive orange and PET microplastics using magnesium hydroxide and polyacrylamide. The results show that the removal efficiencies for reactive orange and PET are 98% and 93% respectively under optimal conditions. The main mechanisms involve electrical neutralization and adsorption for reactive orange by magnesium hydroxide, and PAM bridging for PET.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Environmental Sciences
Yutao Zhang, Jianhai Zhao, Wenpu Li, Hongying Yuan
Summary: Microplastics, one of the emerging pollutants, can have adverse effects on human health and ecosystems. Magnetic magnesium hydroxide coagulant (MMHC) was prepared and used with PAM to remove polyethylene microplastics from water. MMHC showed higher removal efficiency compared to traditional magnesium hydroxide coagulant, but had bubble-like clusters on its surface. The effect of PAM adding time on removal efficiency was investigated.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Engineering, Environmental
Bo Li, Jianhai Zhao, Wenqi Ge, Wenpu Li, Hongying Yuan
Summary: Microplastics have become a global concern due to the increasing demand for plastic products and the worsening microplastic pollution. In this study, magnesium hydroxide and anionic polyacrylamide were used as a dual-coagulant to effectively treat water containing polyethylene, improving PE removal efficiency significantly. Various factors such as floc settling rate, type and dosage of PAM were found to significantly influence the removal of MPs, with adsorption bridging and sweeping identified as the main coagulation mechanisms.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Yutao Zhang, Jianhai Zhao, Zhaoyang Liu, Sufeng Tian, Jingfang Lu, Rong Mu, Hongying Yuan
Summary: In this study, a magnetic magnesium hydroxide coagulant was prepared to effectively remove polyethylene microplastics from wastewater. The highest removal efficiency of microplastics reached 87.1% when the ratio of Mg2+ to OH- was 1:1.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Environmental
Zhaoyang You, Changrong Zhao, Yongjun Sun, Chang Zhuang
Summary: This study used PAFC and CPAM as coagulants to enhance the removal of ZnO-NPs from water, with the PAFC/CPAM combination showing the highest efficiency in removing ZnO-NPs.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Environmental Sciences
Yingying Duan, Jianhai Zhao, Xiuming Qiu, Xiaoli Deng, Xiaoyu Ren, Wenqi Ge, Hongying Yuan
Summary: Microfibers are a type of pollutants widely found in water bodies. In this study, magnesium hydroxide was used as a coagulant to investigate its performance and mechanism in removing dyes and microfibers. The presence of dyes in the system enhanced the removal of microfibers. The removal mechanisms involved electrical neutralization, sweep flocculation, and adsorption. Higher turbidity and rotational speed improved the removal efficiency. This study provides important theoretical support for understanding the coagulation characteristics and mechanisms in removing complex pollutants in printing and dyeing wastewater.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Chemical
Junjie Yu, Hui Xu, Xiaofang Yang, Hongyan Sun, Zhiyuan Jin, Dongsheng Wang
Summary: This study investigates the growth mechanism and properties of HA-floc under different stirring conditions. The results show that HA is removed in the early stages and does not vary significantly during floc growth. The stirring condition does not affect the removal of HA, but has a remarkable effect on floc growth and structure.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Jianhai Zhao, Anmin Wang, Linling Mei, Wenqi Ge, Wenpu Li, Hongying Yuan
Summary: This study investigated the use of polyacrylamide (PAM) compounded with magnesium hydroxide as a dual-coagulant for treating reactive orange simulated wastewater. The results showed that under proper mixing conditions, the floc size and strength increased and the flocs had a strong capacity for re-growth. The main coagulation mechanisms in the dual-coagulant system were the adsorption of magnesium hydroxide and the function of PAM.
DESALINATION AND WATER TREATMENT
(2022)
Article
Geochemistry & Geophysics
Yuping Fan, Yangyang Zhang, Xianshu Dong, Xiaomin Ma, Na Li, Wei Jin
Summary: This study investigated the impact of coagulant type and dosage on the clarity, zeta potential, floc size, and floc structure of a coal slurry suspension. The findings showed that trivalent ions had lower critical coagulation concentrations and AlCl3 and FeCl3 had a greater effect on initial settling. Additionally, trivalent ions significantly decreased the supernatant turbidity at lower dosages, enhancing the coagulation effect.
Article
Engineering, Chemical
Jiangya Ma, Rui Zhang, Wei Xia, Yanli Kong, Yong Nie, Yahua Zhou, Chi Zhang
Summary: A novel covalently bonded composite coagulant CAFM was synthesized through UV initiation, which showed high efficiency in removing algae and turbidity from water. The use of CAFM resulted in minimal residual concentrations and the formation of compact algae flocs, highlighting its importance in drinking water treatment.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Environmental Sciences
Yu Xiang, Hui Xu, Chun-fu Li, Hailu Demissie, Kun Li, Hua Fan
Summary: The study demonstrated that the addition of algal cells could enhance fluoride removal efficiency by increasing the distribution of Al(OH)(3) in flocs. However, excessive Al3+ could damage algal cells and worsen the defluoridation effect by releasing intracellular organic matter. On the other hand, Al-13 mainly removed fluoride through ion exchange, substitution, and hydrogen bonding, maintaining defluoridation performance effectively at high dosages without damaging the integrity of algal cells.
Article
Environmental Sciences
Chao Guo, Leicheng Guo, Sarah Bass, Andrew J. Manning, Zhongwu Jin, Yinjun Zhou
Summary: The effects of different types of organic matter on fine sediment flocculation were investigated through laboratory tank experiments. Results demonstrated that the introduction of organic polymers (such as xanthan gum and guar gum) significantly enhanced flocculation, while the addition of humic acid had minimal influence. The nonionic polymer guar gum showed greater efficacy in promoting larger and more fractal flocs compared to the anionic polymer, xanthan gum. Non-linear trends were observed in the evolution of floc size and structure with increasing ratios of organic polymer concentration to kaolinite concentration.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Environmental
Yanxia Zhao, Huiqing Lian, Chang Tian, Haibo Li, Weiying Xu, Sherub Phuntsho, Kaimin Shih
Summary: Titanium-based coagulation has been proven effective for purifying micro-polluted water containing algae, with the presence of algae enhancing the removal of organic matter. The study found that polytitanium coagulation is highly effective in separating algae from surface water, even achieving up to 98% removal. The presence of algae in water can assist polytitanium coagulation by acting as an additional coagulant or flocculation aid.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2021)
