Influence of landfill leachate on water environmental quality of urban rivers

To improve the quality of the urban water environment, the influence of landfill leachate on the quality of the urban river water environment was studied. Two garbage transfer stations A and B in H city were taken as research areas, and the common river C near the two garbage transfer stations was taken as a fixed-head boundary. The influence of landfill leachate on the water environment quality of urban rivers was studied from three aspects: the influence of surface water environment quality and the influence of leachate on groundwater environment quality of rivers. The results showed that chemical oxygen demand (COD), biochemical oxygen demand (BOD5), ammonia nitrogen, TN and TP in the mixture of leachate and cleaning water of the two garbage transfer stations exceeded the standard several times. The flushing water and leachate of the two garbage transfer stations were mixed into the urban sewage pipe network or the rain-sewage mixed pipe network. The leachate had unbalanced nutrition, alkalinity, high ammonia nitrogen content, and high chroma, and contained both of them. There are a large number of refractory organic matter and a variety of organic pollutants which can reduce the performance of the organism. A variety of pollutants from leachate were detected in the upper stagnant water and diving water samples in H city, but the pollutant content in the diving water samples was lower than that in the upper stagnant water samples of surface water and the diving water samples, the content of Fe and Mn was very high and the pollution was serious. Thirteen kinds of organic pollutants from leachate were detected in surface water of H city, the discharge load of compressor refuse transfer station was the highest, and the COD load of pollutants was the highest, followed by BOD5. The results show that landfill leachate can increase the content of organic pollutants in surface water and groundwater, increase a load of organic pollutants in the river water environment, and reduce the quality of the urban river water environment.