臭氧—生物活性炭工艺去除饮用水中AOC的研究

Study on AOC Removal from Drinking Water by Ozone/Biological Activated Carbon Process

AOC是衡量饮用水生物稳定性的重要指标。研究发现,不同的臭氧投加量下砂滤出水的AOC变化不显著,考虑氧化作用和消毒效果,将最佳的臭氧投量确定为1～2mg/L。生物活性炭(BAC)滤池改善了臭氧氧化后出水的生物稳定性,对TAOC的去除率稳定在28%～65%,而对AOC-P17的去除效果优于AOC-NOX的,因而表现出一定的选择性。较长的空床接触时间(EBCT)并不能保证对AOC的良好去除,但有利于TOC的去除,同时水温的降低一定程度上影响了BAC对AOC的去除效果。

The AOC is an important index to evaluate the biostability of drinking water. The study finds that the AOC in sand filtrated water does not change significantly at different ozone dosages. Considering disinfection arid oxidation, the optimal ozone dose should be controlled at 1 to 2 mg/L. The BAC filter improves the biostability of ozonated water by removing TAOC of 28% to 65% , and removes more AOC-P17 than AOC-NOX with a certain selectivity. The long empty bed contact time （EBCT） is favorable for removing TOC but not good for removing AOC. Meanwhile, the water temperature reduction influences BAC for removing AOC to a certain extent.