Study on the Calculation of Pollutant Carrying Capacity and Pollution Prevention and Control Strategies in the Dengzhou Section of the Paizi River

HE Shengzhe; LIN Jingjing; HUANG Xiaolong; ZHANG Meng; ZHAO Yanhui; YAN Meixia; CHEN Xifan

doi:10.19672/j.cnki.1003-6504.1206.24.338

Abstract：Investigating the pollution load and calculating the pollutant carrying capacity of the river is of great guiding significance for coordinating regional economic development and environmental protection.Based on the requirements of the water quality compliance of the control section,a technical system of"water quality evaluation-river pollution load calcula-tion-pollutant carrying capacity accounting-section compliance assessment"was established,and the current situation of water environment and pollution prevention and control ideas in the Dengzhou section of the Paizi River were discussed.The results showed that in 2020,the water quality of the section of Dengzhou City of Paizi River could meet the water quality assessment target of the"14th Five-Year Plan formulation",and the main classification factors were NH3-N and TP.In 2020,the pollution loads of COD,NH3-N,and TP into the river were 1 022.73,43.13,and 22.89 t/a,respectively,and the main pollution sources were livestock and poultry breeding pollution,agricultural planting pollution,and township life pol-lution,and the pollution sources were mainly distributed in Taoying Town,Dusi Town,and Linba Town.When the water quality target is surface water class Ⅳ,the pollutant carrying capacity of COD,NH3-N and TP in the study section is 1 750.58,113.04 and 23.03 t/a,respectively,which can withstand the pollution load into the river,but there is still a risk that TP and NH3-N exceed the standard.When the water quality target is raised to surface water class Ⅲ in the future,the pollutant carrying capacity of TP and COD is insufficient,and the proportion of pollution load in the river that needs to be reduced is 43.38％and 31.41％,respectively.It is suggested to build a water pollution prevention and control system from three aspects:emission reduction,flow increase,and strong supervision,so as to further improve the water environment quality of the Deng-zhou section of the Paizi River.