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.
Review
Engineering, Environmental
Yonghai Gan, Jingbiao Li, Li Zhang, Bingdang Wu, Wenguang Huang, Haojie Li, Shujuan Zhang
Summary: Titanium coagulants have attracted attention for their outstanding performance and lack of metal residues, but face challenges in controllability, speciation analysis, and identifying specific application scenarios. Cost reduction and sludge recycling are important measures to promote the future application of titanium coagulants in water treatment.
CHEMICAL ENGINEERING JOURNAL
(2021)
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
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
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, Environmental
Ruihua Li, Xianghui Qi, Wenyu Wang, Meng Cheng, Yingjie Wang, Peng Zhang, Gangfu Song
Summary: This study optimized polymeric aluminum chloride (PAC) and polyacrylamide (PAM) for treating surfactant-kaolin wastewater, investigated the influence of chemical dosage, initial pH, and shear force on floc properties, and discussed mechanisms for soil particle coagulation in the matrix of simulated washing solution. The results showed that adsorption of surfactants or kaolin particles onto aluminum-based hydroxides through entrapment and sweeping effect was the dominating mechanism. PAM can be used as an efficient coagulant aid for PAC to promote floc properties.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2023)
Article
Engineering, Chemical
Congzhong Shi, Qiming Wang, Daiqi Li, Beini Zeng, Qingtao Liu, Yongming Cui, Jinfeng Wang, Xungai Wang
Summary: Wool scouring wastewater contains substantial contaminants that need to be removed. Inorganic composite coagulants (PAFS) were prepared and found to have better performance in treating the wastewater compared to conventional coagulants. PAFS showed higher removal rates for COD and turbidity, along with advantages such as fast settling rate, increased sludge density, and low floc moisture content. This work has practical implications for improving wastewater treatment in the wool scouring industry.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Environmental Sciences
Peng Du, Xing Li, Yanling Yang, Xiaoyan Fan, Xiaobo Fang, Zhiwei Zhou
Summary: The study compared the effects of two-stage addition of PACl and Al-2(SO4)(3) on coagulation efficiency and floc properties, optimizing the dose ratio of primary and secondary addition. Results showed that two-stage addition was less sensitive to pH variation and floc breakage improved colloidal particle removal.
ENVIRONMENTAL TECHNOLOGY
(2021)
Article
Environmental Sciences
Namita Das, Himadri Rajput, Ashraf Aly Hassan, Sandeep Kumar
Summary: This study tested five widely employed coagulants for the treatment of complex oilfield-generated produced water. The results showed that ferric chloride was the most efficient coagulant, removing 74.25% of total solids, with a treatment cost of USD 4 per m(-3) of produced water.
Article
Engineering, Chemical
Jolanta Guminska, Marcin Klos, Krzysztof Gaska
Summary: This paper presents the research results on the resistance to breakage of flocs. Different coagulants with various basicity and aluminium speciation were tested. The study found that increasing the mixing energy during flocs rupture resulted in higher impurities concentration in the water and increased settling of broken flocs. However, water quality indicators decreased with higher coagulant basicity and lower k1/k2 ratio, which reflects the share of polymeric Al species. The study also revealed that flocs rupture did not cause the desorption of dissolved organic pollutants adsorbed during the flocculation stage.
DESALINATION AND WATER TREATMENT
(2022)
Article
Environmental Sciences
Xinyu Hu, Pan Hu, Hu Yang
Summary: In this study, a series of binary graft cationic starch-based coagulants with different hydrophobicities and charge densities were prepared and their coagulation performance was tested in simulated polluted water. It was found that coagulants with higher charge densities and stronger hydrophobicities exhibited better coagulation performance.
Article
Environmental Sciences
Thais Ribeiro, Fellipe Jhorda Ladeia Janz, Dandley Vizibelli, Julio Cesar Angelo Borges, Joelmir Andre Borssoi, Amanda Alcaide Francisco Fukumoto, Rosangela Bergamasco, Natalia Ueda Yamaguchi, Edilaine Regina Pereira
Summary: In this study, an unprecedented method using Moringa oleifera and tannin associated with magnetite was proposed for the treatment of plastic recycling wastewater. The response surface method and central composite rotational design were used to optimize the performance of the magnetic natural coagulants on the coagulation, flocculation, and sedimentation process. The results showed that the combination of natural coagulants with magnetite can effectively remove turbidity, apparent color, and COD in the wastewater, making it a potential environmentally friendly alternative.
Article
Chemistry, Physical
Hongyan Cui, Ming Zhang, Liuwei Zhang, Haidong Li, Yue Wang, Yan Zhao, Qixian Chen, Jingyun Wang
Summary: Proteins have inherent limitations in their clinical applications due to their cell-impermeable nature, but researchers have developed intelligent pH-responsive pro-RNase delivery nanocolloids to overcome this obstacle. The nanocolloids actively accumulate in glioma and exhibit efficient endolysosomal escape, allowing for translocation into the cytosol and RNA degradation for apoptosis of affected cells. This versatile platform shows potent anti-tumor efficacy and has the potential to be used in precision intervention of intractable diseases.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Geochemistry & Geophysics
Hirokazu Kawahara, Hidekazu Yoshida, Shoji Nishimoto, Yui Kouketsu, Nagayoshi Katsuta, Ayako Umemura
Summary: In sedimentary rocks rich in Fe-oxide, bleached spots that are free of Fe-oxide minerals are often observed. The formation of these spots has been explained by reduction reactions in relation to organic substances, but evidence for microbial activities is scarce and it is still debatable whether the spots are of microorganism origin. In zebra rock, bleached spots were found to be formed by pH changes induced by the decomposition of primary pyrite. This study demonstrates that the spots in zebra rock were formed by inorganic chemical reactions, suggesting that using such spots as biomarkers to find life on Mars may not always be possible.
Article
Environmental Sciences
Tayebeh Goli, Yasha Jathan, Yu Yang, Krishna R. Pagilla, Eric A. Marchand
Summary: Most wastewater treatment facilities remove dissolved inorganic nitrogen (DIN) efficiently, but leave dissolved organic nitrogen (DON) at a higher proportion in the effluent. Discharged DON promotes algae growth and formation of hazardous nitrogenous disinfection byproducts (N-DBPs). This study evaluated the DON removal efficiency of enhanced coagulation at a pilot scale using different coagulants and polymer. Enhanced coagulation effectively reduced DON in the effluent with auxiliary benefits of dissolved organic carbon and orthophosphate removal.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Xiao Jiang, Junlian Qiao, Irene M. C. Lo, Lei Wang, Xiaohong Guan, Zhanpeng Lu, Gongming Zhou, Chunhua Xu
JOURNAL OF HAZARDOUS MATERIALS
(2015)
Article
Engineering, Environmental
Chunhua Xu, Bingliang Zhang, Liujia Zhu, Sheng Lin, Xueping Sun, Zheng Jiang, Paul G. Tratnyek
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2016)
Article
Engineering, Environmental
Chunhua Xu, Bingliang Zhang, Yahao Wang, Qianqian Shao, Weizhi Zhou, Dimin Fan, Joel Z. Bandstra, Zhenqing Shi, Paul G. Tratnyek
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2016)
Article
Engineering, Environmental
Xiaolei Shi, Chunhua Xu, Hongying Hu, Fang Tang, Lijuan Sun
WATER SCIENCE AND TECHNOLOGY
(2016)
Article
Engineering, Environmental
Shasha Huang, Chunhua Xu, Qianqian Shao, Yahao Wang, Bingliang Zhang, Baoyu Gao, Weizhi Zhou, Paul G. Tratnyek
CHEMICAL ENGINEERING JOURNAL
(2018)
Article
Engineering, Environmental
Qianqian Shao, Chunhua Xu, Yahao Wang, Shasha Huang, Bingliang Zhang, Lihui Huang, Dimin Fan, Paul G. Tratnyek
Article
Engineering, Chemical
Chunhua Xu, Xiaohong Wang, Sheng Lin, Liujia Zhu, Yaming Chen
Desalination and Water Treatment
(2015)
Article
Engineering, Chemical
Chun-hua Xu, Sheng Lin, Xiao-hong Wang, Ya-ming Chen, Liu-jia Zhu, Zhen-hua Wang
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2014)
Article
Engineering, Environmental
Tiantian Jia, Bingliang Zhang, Lihui Huang, Shuguang Wang, Chunhua Xu
CHEMICAL ENGINEERING JOURNAL
(2019)
Article
Engineering, Environmental
Peng Fan, Lina Li, Yuankui Sun, Junlian Qiao, Chunhua Xu, Xiaohong Guan
Article
Engineering, Environmental
Lian Zhang, Yue Zhang, Xuyan Gao, Chunhua Xu
CHEMICAL ENGINEERING JOURNAL
(2019)
Article
Engineering, Environmental
Bowei Zhang, Ying Guo, Junyu Huo, Huijun Xie, Chunhua Xu, Shuang Liang
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Environmental Sciences
Xiao Wang, Yanshi Zhang, Yue Zhang, Chunhua Xu
Summary: This study investigated the performance of Cr(VI)-contaminated soil remediation using leaching and chemical reduction methods. The results showed that using citric acid as eluant greatly improved the removal of Cr(VI) by SZVI compared to using H2O as eluant. The prepared Cit-SZVI had more FeSx and available -COOH for chelating Cr(VI). The combination of leaching and chemical reduction proposed in this study can greatly enhance the Cr(VI) removal effect in soil, which is important for the remediation of Cr(VI)-contaminated soil.
Article
Engineering, Environmental
Yue Zhang, Zhongkai Duan, Yuhao Jin, Haixiang Han, Chunhua Xu
Summary: The effective sulfidation of ZVI relies on the chemical bridging of FeSx and ZVI, which is achieved through the in situ formation of FeSx on the ZVI surface. This leads to the bonding between the pristine ZVI and the newly formed FeSx phase, resulting in superior electron transportation activity compared to physically coated SZVI. The study elucidates the mechanism of surface generation of FeSx on ZVI and provides new perspectives for the design of high-quality SZVI for environmental applications.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Yanshi Zhang, Zhongkai Duan, Xiao Wang, Yanlu Li, Chunhua Xu
Summary: Incorporating electronegative elemental nitrogen into zero-valent iron/sulfidated zero-valent iron enhances decontamination performance, but the influence of nitrogen modification on the electrical structure of ZVI/S-ZVI is unclear. This study successfully obtained nitrogen-modified sulfidated zero-valent iron and revealed that nitrogen species bind to iron, leading to redistributed surface charges and increased electron density, which improves the conductivity of S-N-ZVI.
JOURNAL OF CLEANER PRODUCTION
(2023)