太湖流域城镇污水处理厂能耗评价与分析

为分析太湖流域污水处理厂的能耗情况,以比能耗分析法为基础,结合多种统计学方法,探究了太湖流域污水处理厂能耗现状、水量比能耗、污染物削减量比能耗、能耗与日处理水量和耗氧污染物削减量之间的关系。结果表明：太湖流域污水处理厂2017年能耗均值为0.458 kWh·m⁻³,高于发达国家污水处理厂能耗平均值;太湖流域处理规模大于5×10⁴ m³·d⁻¹的污水处理厂水量比能耗基本稳定在0.33 kWh·m⁻³,而处理规模小于5×10⁴ m³·d⁻¹的污水处理厂水量比能耗波动较大;化学需氧量(COD)和氨氮(${rm{NH}}_4^{+} $-N)削减量与污染物削减量比能耗之间均存在幂函数关系,在每个污染物出水浓度区间内,均呈现削减污染物量越多,污染物削减量比能耗越低的趋势;污水处理厂能耗与日处理水量和耗氧污染物削减量之间存在线性关系。因此,对污水处理厂的节能降耗须重点关注污染物削减量比能耗的降低。

Energy consumption evaluation and analysis of wastewater treatment plants in Taihu basin,China

In order to analyze the energy consumption of wastewater treatment plants (WWTPs) in Taihu basin, based on specific energy consumption, the energy consumption status, wastewater specific energy consumption and specific energy consumption of pollutant reduction, as well as the linear relationship between the energy consumption and wastewater volume and the reduction of oxygen-consuming pollutants of WWTPs in Taihu Basin were explored with combination of various statistical methods. The results show that the average energy consumption of WWTPs in Taihu basin in 2017 are 0.458 kWh·m−3, which are considerably higher than the average values of WWTPs in developed countries. The wastewater specific energy consumption of WWTPs with treatment capacity greater than 5×104 m3·d−1 in Taihu Basin is basically stable at 0.33 kWh·m−3, while the wastewater specific energy consumption of WWTPs with treatment capacity less than 5×104 m3·d−1 presents great fluctuation. There is power function relationship between specific energy consumption of pollutant reduction and the reduction of chemical oxygen demand (COD) and ammonia nitrogen(${rm{NH}}_4^{+} $-N). Within the effluent concentration range of each pollutant, the more reduction of pollutants is during the wastewater treatment process, the lower specific energy consumption of pollutant reduction is. There is a linear relationship between the energy consumption and wastewater volume or the reduction of oxygen-consuming pollutants. Therefore, attention should be paid to the specific energy consumption of pollutant reduction to save energy and reduce consumption in WWTPs.