多因素对地下污水厂H2S与NH3浓度的影响
Effect of multi factor on H2S and NH3 concentration in underground wastewater treatment plants

依托现场实验测试，采用二阶正交数值仿真实验，以脱水机房为例，分析了温度、湿度及排风量对地下污水厂H2S和NH3浓度的影响，并提出了一种结合污染水平和排风能耗的综合评价指标。分析结果表明，脱水机房H2S和NH3浓度受温度和排风量交互效应影响显著（p<0.05）。在20℃时脱水机房内H2S和NH3浓度最低，比35℃时污染水平降低2.5倍，综合评价指标计算结果显示，在2.7次换气次数下综合评价指标较小，K值为4.5。对于处理量为10万t/d的污水厂，换气次数低于2.7次脱水机房的恶臭浓度偏高，高于2.7次排风能耗过大，取2.7次换气次数范围最为合理。
With experiment test, a second-order orthogonal experiment was carried out to analyze the weight of factors affecting H2S and NH3 concentration in sludge dewatering of underground wastewater treatment plants:temperature, humidity and exhaust volume, and according to pollution level and energy consumption, a comprehensive evaluation index was put forward. The results indicate that Interaction between temperature and exhaust volume is important to H2S and NH3 concentration (p<0.05). When the outdoor temperature is 20℃, the H2S and NH3 concentration of the dewatering machine room is the lowest. It is reduced by 2.5 times compared with 35℃. According to the comprehensive evaluation index, the minimum K value is 4.5 in the ventilation frequency of 2.7. Below 2.7 times of ventilation, the odor concentration is too high, and the energy consumption is too large when higher than the 2.7 times of ventilation. Therefore, the most appropriate number of ventilation is 2.7 for dewatering room with treatment capacity ten thousand per day.