活化沸石曝气生物滤池预处理微污染源水的研究

采用上流式活化沸石滤料曝气生物滤池(AZBAF)对杭州市某微污染地表源水进行生物预处理.结果表明,活化沸石的高效吸附作用可使AZBAF通过自然挂膜实现快速启动.在水力负荷1.2m/h,气水比为(3~1):1条件下,AZBAF对TOC和CODMn的去除率分别为40%~60%和10%~27%,尤其对小分子量(MW<1kDa)有机物具有良好的降解作用.同时系统对NH3-N的去除率保持在90%以上.污染物的去除主要发生在滤池30cm以下部分,这与其中微生物的数量和活性分布规律一致.暂时停运(5~10d和35d)对生物过滤影响较小,系统重启后可在6~8h和24h内基本恢复至原有处理水平.

Pretreatment on micro-polluted source water by activated zeolite biological aerated filter

An up-flow activated zeolite media biological aerated filter (AZBAF) was developed and employed for the treatment of micro-polluted water in Hangzhou. The AZBAF could start up quickly by an efficient adsorption of the media during the natural precoating period. Under the conditions of hydraulic loading 1.2m/h and gas/water ratio 3~1:1, around 40%~60% and 10%~27% of organics could be romoved in terms of TOC and CODMn, respectively, in which most of the low molecular weight organics (MW<1kDa) was efficiently biodegraded. Meanwhile, the removal efficiency of NH3-N was stably kept over 90% during the AZBAF operation. Additionally, most pollutants were removed in the lower part of the filter column (0~30cm), and this removal characteristics was somehow consistent with the distribution profiles of biomass (phospholipid-P) and their activities (oxygen uptake rate). In the case of shutdown of the AZBAF in both short-term (5~10d) and long-term (35d), the biofilter could be recovered to its original performance in 6~8h and 24h, respectively.