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Preparation and performance of a new chitosan-based flocculant based on the dual functions of flocculation and sterilization
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Xiao-bo TAN1, Jun-yi JIANG1, Man-li SUN1, Zhan-mei ZHANG2, Hong LI1, *, Huai-li ZHENG1, Wei DING1
China Environmental Science | 2025, 45(1) : 132 - 143
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China Environmental Science | 2025, 45(1): 132-143
• Water Pollution Control •
Preparation and performance of a new chitosan-based flocculant based on the dual functions of flocculation and sterilization
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Xiao-bo TAN1, Jun-yi JIANG1, Man-li SUN1, Zhan-mei ZHANG2, Hong LI1, *, Huai-li ZHENG1, Wei DING1
Affiliations
  • 1.College of Environment and Ecology, Chongqing University, Chongqing 400045, China
  • 2.School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China
Published: 2025-01-20
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To control the addition of chlorine disinfectant in drinking water disinfection technology, and to combine the coagulation and disinfection units to reduce energy consumption, a quaternary ammonium chitosan-based flocculant (CTS-g-CHPTAC) with dual functions of flocculation and sterilization was developed. This flocculant effectively removes kaolin and Escherichia coli from wastewater. Material characterization results showed that CTS-g-CHPTAC had a higher cationicity (29.51%) and better water solubility. Flocculation performance tests indicated that the turbidity and bacterial removal rates of CTS-g-CHPTAC reached up to 98.5% and 99%, respectively, when dosages were 0.2mg/L and 2mg/L. Meanwhile, the removal rate was as high as 97% when the dosage of CTS-g-CHPTAC was only 1~1.6mg/L in the mixed simulated wastewater, and the removal rate of mixed pollutants was as high as 95% within the pH range of 5~11. It is speculated that CTS-g-CHPTAC's higher cationic content and rougher surface topography enhance charge neutralization, adsorption bridging, and net sweeping effects, leading to improved flocculation.Furthermore, CTS-g-CHPTAC has bactericidal function, which can interact with the cell wall and cell membrane of E. coli through the quaternary ammonium group on CHPTAC and the amino group on chitosan and kill E. coli.

Chitosan-based flocculants  /  Quaternary ammonium modification  /  Escherichia coli  /  Kaolin  /  Water treatment agents
Xiao-bo TAN, Jun-yi JIANG, Man-li SUN, Zhan-mei ZHANG, Hong LI, Huai-li ZHENG, Wei DING. Preparation and performance of a new chitosan-based flocculant based on the dual functions of flocculation and sterilization[J]. China Environmental Science, 2025 , 45 (1) : 132 -143 .
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Year 2025 volume 45 Issue 1
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Article Info
  • Receive Date：2024-06-17
  • Online Date：2026-03-18
  • Published：2025-01-20
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  • Received：2024-06-17
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Affiliations
    1.College of Environment and Ecology, Chongqing University, Chongqing 400045, China
    2.School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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