低温氨氮减排技术的中试试验

Pilot-Scale Test of Ammonia Nitrogen Emission Reduction Technology at Low-Temperature

在冬季低温条件下，利用设置在厂区内处理量为100t／d的中试装置进行试验，分别探讨了水温、pH、溶解氧、停留时间与出水氨氮的关系。结果显示曝气池水温变化范围为11．0～15．5℃，pH保持在7．0～7．5，在曝气充足情况下未见出水氨氮超标现象（均小于8mg／L）。通过提高溶解氧，可以有效提高氨氮去除率，出水氨氮能够稳定达到《城镇污水处理厂污染物综合排放标准》（GB18918--2002）一级A标准。而当溶解氧降低至1mg／L以下，则会影响出水氨氮达标。停留时间为10—14h对出水氨氮的影响不明显。

Under the condition of low temperature in winter, the pilot-scale experiment was conducted by 100 t/d test equipment in the wastewater treatment plant. The relationships between water temperature, pH, DO, retention time and NH4 - N^＋ of effluent were discussed in this paper. The results show that the range of water temperature is 11.0 ~ 15.5 ℃ and pH is 7.0 ~ 7.5. When DO is sufficient, NH4 - N^＋ of effluent is less than 8 mg/L, which meets standard. With the increase of DO, removal rate of NH4 - N^＋ can be improved efficiently and NH4 - N^＋ of effluent can stably meet Urban Sewage Disposal Plant Contamination Integrated Discharge Standard （GB 18918--2002） Class I A. When DO is less than 1 mg/L, NH4 -N^＋ of effluent will be over standard. In addition, the retention time in 10 ~ 14 h has less influence on NH4 - N ^＋ of effluent.