低温下生物增效技术对去除氨氮效果的改善

Improvement of Ammonia Nitrogen Removal by Bioaugmentation Technology at Low Temperature

在冬季水温低的情况下，为改善对氨氮的去除效果而实施了生物增效试验，连续30d向某污水处理厂的曝气池投加硝化菌，研究了投加菌剂后对氨氮的去除效果。投加菌剂10d后，在水温为12．4～15．2℃时，二沉池出水氨氮浓度〈15mg／L，对氨氮的去除率由68．6％提高至84．7％，处理水量由6．2×10^4m^3／d提升至7．5×10^4m^3／d。菌剂投加期结束后的30d内，在维持高处理水量的前提下，出水氨氮〈7mg／L，去除率〉91％，处理水量超过设计水量约25％。同时，该技术的费用较低，直接菌剂成本仅为0．067元／m^3。

In order to improve ammonia nitrogen removal efficiency at low temperature in winter, a bioangmentation test was conducted by adding nitrifying bacteria into an aeration tank of a sewage treatment plant for 30 d continuously. The removal efficiency of ammonia nitrogen by adding nitrifying bacteria was investigated. After 10 d of adding nitrifying bacteria and with sewage temperature of 12.4 to 15.2 ℃, the ammonia nitrogen concentration in the secondary settling tank effluent was less than 15 mg/L, the removal rate increased from 68.6% to 84.7%, and the to 7.5 ×10^4m^3/d/d. Within 30 d after the addition period, was less than 7 mg/L, the removal rate was more than 91% more than the design capacity. The direct cost of nitrifying treatment capacity rose from 6.2×10^4m^3/d/d the effluent ammonia nitrogen concentration , and the treatment capacity was about 25 % bacteria was 0.067 yuan/m3.