净水工艺对饮用水生物稳定性控制的研究

利用现场中试装置,系统比较了预处理单元、常规处理单元及深度处理单元中可生物降解有机物BDOC和AOC的生成和去除特性.结果表明:常规工艺+活性炭过滤对CODMn的去除率仅能达到30%,无法有效保证出水水质要求,而常规工艺+臭氧活性炭可以很好地满足水质标准,去除率可达50%以上.以控制生物稳定性为目的时,氧化剂的投加会增加AOC和BDOC浓度,降低生物稳定性.不投加氧化剂,直接采用常规工艺+普通活性炭过滤可将出水AOC含量控制在50μg/L以下.但要实现对COD_Mn和生物稳定性的同时控制,常规工艺+臭氧+生物活性炭的工艺组合是本研究中的最佳工艺组合.

Controlling of Biological Stability in Drinking Water by Purification Processes

In a pilot scale system, the formation and removal of BDOC and AOC were compared in the pre-treatment unit, traditional treatment unit and advanced treatment unit. The experimental results indicate that the COD(Mn) removal in a traditional process plus active carbon filter system is 30% and in a traditional process plus ozone and active carbon filter system is more than 50%. The AOC contents in the effluent of a traditional process plus active carbon filter system is below 50 microg/L. The optimum process combination in the research is: traditional process plus ozonation plus biological active carbon.