HAOFei-lin,SHENMing-wei.Effect of Secondary Settling Tank Operation Conditions on Retention Characteristics of Microplastics in Wastewater Treatment Plant[J].China Water & Wastewater,2024,40(3):38-45.
污水厂二沉池运行条件对微塑料截留特性的影响
- Title:
- Effect of Secondary Settling Tank Operation Conditions on Retention Characteristics of Microplastics in Wastewater Treatment Plant
- Keywords:
- microplastic; wastewater treatment plant; secondary settling tank; retention; operation parameter; water distribution mode
- 摘要:
- 为了探索已建成运行污水处理厂低成本、高效截留微塑料的途径，以污水处理流程末端的二沉池单元为研究对象，考察了二沉池的3个运行参数（进水微塑料浓度、污泥浓度和水力负荷）和2种配水方式（周进周出、中进周出）对3种典型微塑料颗粒（聚乙烯PE、聚丙烯PP和聚氯乙烯PVC）截留特性的影响。结果表明，通过调节二沉池的运行参数和改变其配水方式，可有效提高二沉池对微塑料颗粒的截留率，采用中心进水方式可将PE和PP微塑料颗粒的截留率提升近20%，二沉池出水中的微塑料颗粒以对人类更为有害、等效直径<35 μm的颗粒为主。同时，运用方差分析方法，提出了不影响污水处理厂主体工艺的优化调节方案。
- Abstract:
- This paper investigated the effect of three operation parameters (microplastic concentration in influent, sludge concentration and hydraulic loading rate) and two water distribution modes (peripheral-feed and peripheral-overflow, central?feed and peripheral-overflow) on the retention characteristics of three typical microplastic particles (polyethylene, polypropylene and polyvinyl chloride) in secondary settling tank at the end of the wastewater treatment process, so as to explore the low-cost and efficient retention of microplastics in existing operational wastewater treatment plants. The retention efficiency of microplastic particles in the secondary settling tank was effectively improved by adjusting its operation parameters and changing its water distribution mode. The retention rates of polyethylene and polypropylene microplastic particles were improved by nearly 20% by using the central-feed mode. The microplastic particles in effluent from the secondary settling tank were mainly those more harmful to humans with equivalent diameter less than 35 μm. In addition, the optimized regulation scheme which did not affect the main process of wastewater treatment plant was proposed by using variance analysis method.
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