The total length is about 1200 meters, the width of the river channel is 12 to 18 meters, the water depth is about 0.4 to 1.8 meters, and the thickness of the black and smelly sludge at the bottom of the water is about 0.4 to 0.8 meters. m/s, both sides of the river are agricultural settlements, and domestic sewage and wastewater are directly discharged into the river, which is a typical urban village river, and stone retaining walls have been made on both sides of the river. There is a black and odorous phenomenon, and there are cyanobacteria outbreaks in summer, which is a severely eutrophic river.

Before treatment: cyanobacteria broke out and floated on the water in a large area;the black and smelly sludge at the bottom of the water is about 0.4-0.8 meters thick

After treatment：the water body is crystal clear ； the organic matter of the sediment is partially decomposed, showing gray-white inorganic matter

During the treatment process: microorganisms multiply and form bacterial micelles.

In the process of governance: metazoans such as water worms have proliferated in large numbers, and the water ecology has been gradually restored

After water quality improvement: Indigenous fish are proliferated and ecology is gradually restored

After treatment: the color of the river water body is more natural, and the water quality is obviously improved.