Discussion on the value of some parameters in the calculation of regional water pollutant discharge amount

Calculation of water pollutant discharge amount is the basis for compiling regional water pollution control plans and water resources protection plans. Although most of the calculation parameters can be obtained from the relevant standards or guidelines, the calculation and value method forsome important parametersare not clear or have different reference standards, such as urban sewage treatment rate, rural domestic pollution discharge coefficient and sewage discharge amount from service industry. Take the calculation of pollutant discharge amount in Hangjiahu plain as an example, the calculation method and value range of the above parametersis discussed in this paper.