污水处理厂COD和氨氮总量削减的成本模型

对国内12个城市污水处理厂COD和氨氮总量削减所需单位成本的调研结果显示,根据污水处理量确定运行费用的传统方法不能直接反映污染物总量削减的成本.在处理能力范围内,COD和氨氮总量削减所需的单位电耗随着其去除负荷增加而降低,并逐渐趋向定值.因此本研究以COD和氨氮总量削减所需电耗为基础,建立了污水处理厂的运行成本模型,其影响因素包括进水和出水浓度、设计规模、水量负荷率等,根据该计算模型确定运行成本可以有效激励污水处理厂削减更多的COD和氨氮总量.

Cost model for reducing total COD and ammonia nitrogen loads in wastewater treatment plants

An investigation on the cost for reducing total COD and ammonia nitrogen loads in 12 wastewater treatment plants (WWTPs) showed that the operation cost calculated by the amount of treated wastewater could not reflect the cost to treat the pollutants correctly. Within the treatment capacity of WWTPs, the electrical energy consumption for elimination of one kilogram COD or ammonia nitrogen COD decreased as the load reduction of COD or ammonia nitrogen increases, which became stable finally. Therefore, the model to determine the cost for reducing total COD and ammonia nitrogen loads was established based on energy consumption. The impact factors include influent and effluent concentration, treatment capacity and hydraulic load ratio. The deduction from this model would encourage WWTPs to reduce more loads of COD and ammonia nitrogen.