River training of Zhongtang River
Water Quality Improvement in River Training of Zhongtang River
The river management for Yinzhou District, Panhuo Street, the living area of the river in the pond river to provide a holistic solution, the river management area is about 12 kilometers long, 30 ~ 40 meters wide, 1.5 ~ 3 meters deep, perennial water reserves of 1.2 million tons. The upper reaches of the river starts from the junction of Hengjie Street for Dongqianhu, west of Meiliang River, Zhuangjia Creek, eastward through the Jishigang, sell surface bridge, Wangchun Bridge, and the confluence of the back of the Tang River into the West Gate of Ningbo City, across the Yinxi Plain, is one of the important rivers and canals for water diversion into the city of Ningbo. The bottom of the silt, water mobility is more complex, sometimes to the west to Fenghua River flow, sometimes to the east of the countercurrent.
Before the treatment, the dissolved oxygen content in the water was low, a small number of fish survived, a small number of aquatic plants survived, the water body was seriously eutrophied, and the water body was yellowish-green in color, which was initially judged to be the outbreak of green algae, cyanobacteria and other algae. This river treatment project builds an efficient dissolved air system through nano bubble to improve the dissolved oxygen concentration in the river water, composite microorganisms to promote ecological treatment capacity, combined with biological filter dams to increase the biological contact time, and the use of biological contact denitrification and removal of phosphorus, effectively removing COD, ammonia nitrogen and total phosphorus from the water, to ensure that the water quality stably meets the standards and to realize the health and stability of the aquatic ecosystem.
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