SANGWen-jiao,ZHANGWen-bin,LUWei,et al.Effects of Polystyrene Microplastics on Flocs Formed in Coagulation Process of Waterworks[J].China Water & Wastewater,2022,38(11):32-37.
聚苯乙烯微塑料对自来水厂混凝絮体的影响
- Title:
- Effects of Polystyrene Microplastics on Flocs Formed in Coagulation Process of Waterworks
- Keywords:
- water treatment; microplastics; polystyrene; coagulation; turbidity; floc size; fractal dimension
- 摘要:
- 混凝是净水工艺中不可或缺的环节，而微塑料在原水中客观存在。以聚苯乙烯（PS）为例，分析了微塑料对混凝过程中浊度去除效果、絮体大小和分形维数的影响。结果表明，当混凝剂投加量为14 mg/L时，微塑料的存在导致浊度去除率降低了7.1%，絮体大小与分形维数也相应降低；当投加量增加至26 mg/L时，微塑料可使浊度去除率提高0.8%，达到95.2%，分形维数增大至1.587，絮体粒径无明显变化。说明在混凝剂投加量较低时，微塑料的存在对浊度去除效果、絮体粒径及分形维数有负面影响，但随着混凝剂投加量的继续提高，负面影响减弱，微塑料的存在甚至还可以促进浊度去除和分形维数的提高。
- Abstract:
- Coagulation is a necessary process in water treatment, and microplastics exist in water resource objectively. In this study, taking polystyrene (PS) as an example, the effects of microplastics on turbidity removal, floc size and fractal dimension during coagulation were analyzed. The experimental results indicated that when the dosage of coagulant was 14 mg/L, the presence of microplastics reduced the turbidity removal rate by 7.1%, and the floc size and fractal dimension also decreased accordingly; When the dosage increased to 26 mg/L, the presence of microplastics increased the turbidity removal rate by 0.8% to 95.2%, the fractal dimension increased to 1.587, and the floc size did not change significantly. It showed that the presence of microplastics had a negative impact on the turbidity removal rate, floc size and fractal dimension when the dosage of coagulant was low. However, as the dosage of coagulant continued to increase, the negative effects were weakened, on the contrary, the presence of microplastics could promote turbidity removal and fractal dimension improvement with higher dosage of coagulant.
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