生物活性炭滤池微型动物泄漏的强化过滤控制

采用孔径10μm的浮游生物网对A水厂活性炭滤池出水的微型动物进行监测,结果表明泄漏的微型动物优势种类为轮虫、线虫、寡毛类和甲壳类.在活性炭层底部增加厚度为40或50cm粒径为0.3～0.5mm的石英砂层,当流速为10～12m.h-1时,对轮虫、甲壳类和寡毛类等体型较大的微型动物能够截留55%以上,但对线虫截留率较低.建议采用10μm的微孔滤网过滤氯接触池出水,可使微型动物穿透进入供水管网的风险降低一个数量级,且工作周期达96h.

The leakage and enhanced filtration control of micro-metazoa in the granular active carbon filter

The 10 um plankton sampling network was used to survey the microfauna in the outflow of granular active carbon (GAC) filter in A plant, which showed that the dominant species were Rotifera, Nematode, Oligochaeta and Crustacea. When the thickness of quartz sand filter layer was 40 or 50 cm, the grain size was 0.3-0.5mm and the flow rate was 10-12 m•h-1, more than 50% of the large metazoan, such as rotifera, crustacean, and oligochaeta, could be intercepted, but few nematode could be intercepted. It was suggested that the 10 um microstrainer should be added after the chlorine chamber, and this enhanced filtration could reduce the risk of microfauna leakage by one grade and the work cycle could reach 96 h.