Characteristics of rural non-point source pollution in Kaijiang Basin of Sichuan Province

ZHANG Peng-yuan;GOU Chu-xuan;WU Yang;ZHANG De;LI Fei;MOU Zi-shen;Datang Environment Industry Group Co., Ltd.;Chengdu Si-Shi Environmental Protection Industry Research and Development Institute;Sichuan Zhongdan Hechuang Environmental Science and Technology Co., Ltd.;Chengdu University of Technology Institute of Environment;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology;

Kaijiang River Basin;;rural non-point source pollution;;spatial distribution;;rural life;;livestock and poultry breeding;;farmland runoff

In order to investigate the Kaijiang River Basin rural non-point source pollution and prevent non-point pollution aggravated, this article choosed rural life source, livestock and poultry breeding source and farmland runoff source of pollution to estimate their load of chemical oxygen demand(COD), ammonia nitrogen(NH_3-N)and total phosphorus(TP)into the river in 2015 by using the blowdown coefficient method. The results showed that the total amount of COD, NH_3-N and TP was 4 906.71, 1 074.02 t and 203.50 t. The contribution of rural life sources to COD and NH_3-N was the largest, and the livestock and poultry breeding sources contributed most to TP contribution to the river. The pollutants in the river were mainly distributed in Zhongjiang County, Santai County and Luojiang County, the total amount of COD, NH_3-N and TP respectively accounted for 84.52%, 84.28% and 89.72% of the total amount of pollutants to the river. Among them,Zhongjiang County pollution load into the river was the largest.