XIANGXiao-fang,XIEXian-chuan,LIUZhen-zhong.Effect of Coagulation on the Removal of Microplastics Attached to Biofilm[J].China Water & Wastewater,2024,40(1):1-7.
Effect of Coagulation on the Removal of Microplastics Attached to Biofilm
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第1期
Page:
1-7
Column:
Date of publication:
2024-01-01
- Keywords:
- microplastics; coagulation; biofilm; polystyrene
- Abstract:
- As a kind of emerging contaminants, microplastics are widely distributed in water. The pollutants carried by microplastics and the potential pathogenic bacteria in biofilm aggravate the environmental hazards of microplastics, and microplastics may enter the water treatment plant with raw water to affect the safety of water quality. Therefore, the removal of microplastics attached to biofilm in water is particularly important. The coagulation was used to remove polystyrene (PS) microplastics that had stayed in natural water for a period of time, polyaluminum chloride (PAC) was used as the coagulant, and the removal rate of microplastics was used as an index to evaluate the coagulation performance. The results showed that when the dosage of PAC was 60 mg/L and pH was 7, the best removal rate of 58.4% was achieved for PS microplastics retained for 9 days. In addition, it was also found that biomass affected the removal efficiency of microplastics to a certain extent. The negative charge on the surface of microorganisms was conducive to the combination of microplastics and metal ions hydrolyzed by the coagulant to form aggregates, thereby promoting precipitation. Zeta potential indicated that charge neutralization occurred during coagulation, and Fourier transform infrared spectroscopy indicated that new chemical bonds were formed between PS microplastics and coagulant during coagulation. It is of great practical significance to study the removal effect and mechanism of microplastics attached to biofilm by coagulation to ensure the safety of water supply and human health.
Last Update:
2024-01-01