Analysis of Water Pollution Sources in Urban Small Watershed Based on PMF Model

The analysis of pollution sources in urban areas has a fundamental effect on the treatment of urban black and odorous water bodies. One of the feasible methods of source analysis is positive matrix factorization (PMF). Based on the water quality monitoring data of a small watershed in Hefei, the main pollution sources were quantitatively analyzed using PMF. PMF analysis results show that urban domestic sewage is the main source of water quality at the monitoring point, and the secondary source is surface runoff. To ensure that the water quality meets the standard, the drainage pipe network in the upstream area of the river needs to be improved, and the function of source control and sewage interception during the life of the arts and sports is to be improved. In the tested water quality, NH3-N is mainly from urban domestic sewage, COD TP is mainly from urban sewage, and SS is mainly from surface runoff.