摘要
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.
出处
《净水技术》
CAS
2015年第2期77-82,共6页
Water Purification Technology
关键词
生物脱氮
低温
溶解氧
停留时间
biological removal of nitrogen low temperature dissolved oxygen (DO) retention time