净水厂常规与深度处理工艺对饮用水生物稳定性控制研究

Study on the effects of conventional water treatment process and advanced water treatment process on biological stability in water treatment plant

以东太湖原水和X净水厂为研究对象,选择了可同化有机碳(AOC)、可生物降解溶解性有机碳(BDOC)和细菌再生长潜力(Bacterial Regrowth Potential,BRP)为生物稳定性的评判指标,探讨了净水厂常规与深度处理工艺对水中生物稳定性的贡献。结果表明:各处理单元对AOC、BDOC和BRP有不同的去除效果,预臭氧、主臭氧和后加氯工艺会引起AOC、BDOC和BRP的升高;混凝沉淀、砂滤和BAC工艺对AOC、BDOC和BRP具有较好的去除效果;常规工艺出厂水中AOC比深度处理工艺平均低10.10%,BDOC与BRP均值分别高出43.38%与25.95%。因此,在运行中应注重混凝沉淀工艺和臭氧工艺的管理与控制。

In the current study,using the three indicators-assimilable organic carbon（AOC）,biodegradable dissolved organic carbon（BDOC）and bacterial regrowth potential（BRP）,the biological stability of the raw water from East Taihu Lake and the produced water from X drinking water treatment plant were studied to explore the impacts of conventional water treatment process and advanced water treatment process on water biological stability.The results showed that each process unit had different impacts on the removal of AOC,BDOC and BRP.Pre-ozonation,post ozonation and post chlorination increased the concentrations of AOC,BDOC and BRP.However,coagulation sedimentation,sand filtration and BAC process showed satisfying performance on the removal of AOC,BDOC and BRP.Compared with the water produced from advanced water treatment,the AOC concentration in water produced from conventional water treatment was 10.10%lower;but the BDOC and BRP concentrations were 43.38% and 25.95% higher.Thus,more attention should be paid to the management and control of coagulation,sedimentation and ozonation processes in operation.