城市污水处理厂主要恶臭源的排放规律研究

Odorants Emission Characteristics in a Municipal Wastewater Treatment Plant

对某市污水处理厂主要恶臭源H2S和NH3的排放浓度进行了9个月的连续监测。结果表明，该污水厂主要恶臭源H2S的排放浓度为O～9mg／m^3，NH3排放浓度为0～0．6mg／m^3，其中曝气沉砂池和粗格栅的H2S和NH3排放浓度均呈夏、秋季节高而冬、春季节低的特征，具有明显的季节变化。对恶臭排放影响因素的研究表明，污水水温越低则H2S和NH3的排放浓度越低，当冬季污水水温〈18℃时，曝气沉砂池和粗格栅的H2S和NH3排放浓度均低于检知管的检出限；此外．降雨可以显著降低合流制污水处理厂恶臭污染物的排放浓唐．

In order to control the odor pollution in municipal wastewater treatment plants （WWTPs） , the emission characteristics of some main odorants were studied. The concentrations of emitted H2S and NH3 from a municipal WWTP were monitored continuously for 9 months. The results show that the emission concentration of H2S is 0 -9 mg/m^3, and the emission concentration of NH3 is 0 -0.6 mg/m^3. The concentrations of emitted H2S and NH3 from the aerated grit chamber （AGC） and the coarse screen （CS） show that the concentrations are high during summer and autumn and low during winter and spring, with evident differences during the four seasons. For AGC and CS, the main factor of influencing odorants emission is the temperature of the influent wastewater. The concentrations of the odorants will decrease with the reduction of the temperature. The H2S and NH3 can not be detected if the temperature of the wastewater is lower than 18℃. The concentrations of the odorants from the combined WWTPs will also be reduced significantly after rainfall.