石家庄某制药企业污水处理过程中NH_3排放研究

Study on ammonia emission of sewage treatment process of a pharmaceutical enterprise in Shijiazhuang

为了解污水处理过程中各处理单元NH_3的排放特征,采集石家庄某制药企业各污水处理单元以及经过废气治理后排放的样品,计算各采样点NH_3浓度及排放量。结果表明:各污水处理单元中,水解酸化池NH_3浓度和单位体积污水NH_3排放量均为最高,分别为62.89和3 360 mg/m^3。各污水处理单元NH_3总排放量为0.97 kg/h,单位体积污水NH_3排放量为9 312mg/m^3;经废气治理后,排入环境的NH_3为0.25 kg/h,单位体积污水NH_3排放量为2 400 mg/m^3,去除率为74.2%,经治理后NH_3排放量明显降低。南区、北区废气治理采用碱洗+氧化+水洗工艺,NH_3去除率分别为93.3%和83.1%;生物区废气治理采用生物滴滤床工艺,NH_3去除率为39.1%,碱洗+氧化+水洗工艺对NH_3的去除效果好于生物滴滤床工艺。

In order to study on ammonia emission characteristics of sewage treatment process of a pharmaceutical enterprise, waste gas samples were collected from several wastewater treatment units and waste gas discharge outlet in sewage treatment progress of pharmaceutical industry to analyze NH3 emission characteristics. The study results showed that： the maximum NH3 emission appeared at hydrolysis acidification unite, the point concentration reached62. 89 mg/m^3,emission reached 3 360 mg/m^3 for each treatment of 1 m3 sewage, The sewage treatment process of each unit of ammonia amount was 0. 97 kg/h, the conversion for each treatment 1 m3 wastewater, ammonia production 9 312 mg/m^3, after the treatment of waste gas discharged into the environment ammonia was 0. 25 kg/h,emission reached 2 400 mg/m^3 for each treatment of 1 m3 sewage, ammonia removal rate was 74. 2%, the emission of ammonia gas was obviously reduced after the treatment of exhaust gas. Waste gas treatment in the southern and northern areas adopts the technology of caustic wash ＋ oxidation ＋ washing. The removal rate of ammonia was93. 3% and 83. 1%, The ammonia removal rate of the waste gas treatment facility in the biological zone is 39. 1%.Caustic wash ＋ oxidation ＋ washing has better effect than biotrickling filter in the removal the ammonia.