The underground pipe network in the upper reaches of the river is complex, with four branch box culverts, and the sewage interception along the branch box culverts is not in place, and the rain and sewage flow into the box culvert; There is a phenomenon of direct sewage discharge in residential areas on both sides of the river; Private cultivation of vegetable fields on the shore and initial rainwater scouring hard roads form surface runoff, which causes non-point source pollution to rivers; Sedimentation of river sediment and seasonal floating of cyanobacteria on the water surface cause serious endogenous pollution to the river. The water ecosystem is structurally deficient, and the water body is basically incapable of self-purification. The content of ammonia nitrogen and total phosphorus in water exceeded the standard, and the surface water quality was inferior to Class V before treatment.
Through multi-technology integrated treatment modes such as pollution control, desilting and dredging, water diversion and living water, ecological restoration (ecological filter bed, biofilter module, ecological interception ditch, sponge measures, cyanobacteria reduction device, aeration reoxygenation, multi-stage ecological submerged island, compound ecological floating bed), point source, non-point source and endogenous pollution were effectively controlled, and at the same time, the river water environment ecosystem was constructed. After treatment, the water quality of the river reaches Class IV water standard stably.
