污水处理厂CANON工艺启动策略

摘要

在污水处理厂进行CANON工艺的小试研究,试验比较了2种自养脱氮(CANON)滤柱的启动策略:R1全部装填成熟的厌氧氨氧化填料,接种亚硝化絮状污泥启动CANON生物滤柱;R2按2:1的质量比混合亚硝化和厌氧氨氧化填料后直接装填启动.R1和R2进水均为污水处理厂A/O工艺出水,水温15~21℃氨氮浓度为35~55mg/L.R1和R2分别用37d和19d使氨氮去除率稳定在95%左右.运行100d后,反应,器出水几乎不含氨氮,但由于硝化细菌(NOB)的增殖,R1和R2最大出水总氮为15.8,12.1mg/L.R1中NOB过量增殖更为严重,而R2出水长期满足了国家一级A排放标准.混合滤料的启动策略减少了2/3厌氧氨氧化滤料的使用量,加速了反应器的启动,更好地抑制了硝化作用,实现氮素长期排放达标.%Lab-scale completely autotrophic nitrogen removal over nitrite (CANON) process was operated in Municipal Waste Water Treatment Plant (WWTP). The tests leading to two started strategies of CANON filter, R1was filled with filler with matured ANAMMOX bacteria and inoculated nitrite flocculent sludge, R2 started with mixing nitrification filter and anaerobic ammonium oxidation filter with weight ratio of 2:1. The inlet water of R1 and R2 was domestic sewerage after the A/O phosphorus removal treatment and keeping the temperature between 15~21degree and ammonia nitrogen concentration within 35~55mg/L. The R1 and R2 made use of 37d and 19d to keep ammonia removal rate stable at 95%. After operated 100d, the effluent of reactor almost did not contain ammonia and the maximum effluent total nitrogen concentration of R1and R2 was 15.8mg/L and 12.1mg/L because of excessive proliferation of NOB. Specially the more worse of R1, and effluent of R2 met the first level A emission standards. The start-up strategy of mixed media reduced two thirds of the amount used in the anaerobic ammonium oxidation filter media, accelerated the start-up of the reactor, inhibited the activity of nitrite oxidation better, and achieved the long-term nitrogen emission standards.