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针对某电镀污水处理厂物化出水,采用活性污泥法+后置反硝化曝气生物滤池(BAF)工艺进行脱氮深度处理中试研究,结果表明,活性污泥法单元COD和NH3-N平均去除率分别达49.37%和69.30%。反硝化BAF单元NO_3~--N和TN平均去除率分别达90.47%和60.42%,出水NO_3~--N的质量浓度基本在10 mg/L以内;停留时间对反硝化BAF脱氮效果影响不大,43 min出水时NO_3~--N容积负荷可达1.5 kg/(m3·d);去除单位氮(N)的碳源消耗量和碱度增加量与理论值相近,反硝化BAF运行成本(碳源部分)为0.41元/t,折合去除每10 mg/L的N运行成本较低,为0.08元/t左右。
A pilot study on advanced denitrification treatment of activated sludge process and post-denitrification biological aerated filter (BAF) was carried out for the effluent from a certain electroplating wastewater treatment plant. The results showed that the activated sludge process unit COD and NH3-N The average removal rate reached 49.37% and 69.30% respectively. The average removal rates of NO_3 ~ - N and TN in denitrifying BAF units were 90.47% and 60.42%, respectively. The mass concentration of NO_3 ~ -N in effluent was less than 10 mg / L. The effect of residence time on the denitrification of denitrifying BAF was not significant The volumetric load of NO_3 ~ --N up to 43 min was up to 1.5 kg / (m3 · d). The carbon source consumption and alkalinity increase of unit nitrogen (N) were similar to the theoretical value. The operating cost of denitrifying BAF (Carbon source part) was 0.41 yuan / t, equivalent to remove the lower operating costs per 10 mg / L of N, 0.08 yuan / t or so.