超滤膜在沿淮某水厂与各生产工艺联用试验研究

Performance of Ultrafiltration Membrane in Combination with Different Conventional Treatment Processes in a Drinking Water Treatment Plant along Huai River

将超滤膜技术分别与给水厂斜板沉淀池、平流气浮池和上向流生物滤池联用,考察各组合工艺的运行情况,并与水厂快滤池进行对比。结果表明,沉淀、气浮与压力式超滤膜联用,对致浊颗粒物与微生物有很好的去除效果,但对CODMn、氨氮等指标的去除效果有限。浮后水溶解氧浓度升高,存在促进压力式超滤膜柱内截留微生物滋生的可能。将生物滤池分别与压力式、浸没式超滤膜工艺组合,在常规化学安全性指标达标的基础上,超滤膜可以有效地截留微生物,降低生物滤池生物泄漏风险,保障出水的生物安全性。在抗生物污染方面,浸没式超滤膜比压力式超滤膜更具优势。快滤池对非溶解性指标的控制虽不及超滤膜,但仍然可以有效地保障出厂水的安全性。

The performances of the combined processes of inclined tube settler, horizontal air flo- tation tank and up-flow biofiher with uhrafihration membrane modules were investigated respectively, and was compared to the conventional rapid sand filtration unit of the drinking water treatment plant. The re- suits showed that the particles and microbes in the inclined tube settler and flotation effluents could be re- moved effectively by uhrafihration cartridge. However, the removal efficiencies of CODMn and NH3 - N were unsatisfactory in both systems. The effluent of flotation tank with high dissolved oxygen concentrationcould provide favorable conditions for aerobic growth of bacteria intercepted in the ultrafihration cartridge. In the system of up-flow biofilter coupled with ultrafiltration membranes, the bacteria escaped from biofil- ter could be easily entrapped in the inlet side of the membrane and the risk of microbe leaking out from the filter was minimized. The biosecurity of the effluent was guaranteed. The submerged ultra_filtration membrane had advantage over the uhrafiltration cartridge in resisting biofouling during clarification of the biofilter discharge. Although rapid sand filtration was not as efficient as uhrafiltration technology in reduc- ing undissolved pollutants, it played an important role in ensuring the safety of the finished water.