1、 Project overview

This project is a comprehensive water environment treatment project of Yitong River Basin in Changchun city - water ecological treatment project of the middle section of Yitong River - river ecological system construction project of the middle section of Yitong River urban area - Edelweiss Park - oxidation pond project of sihuaqiao.
Xueronghua Park sihuaqiao oxidation pond project is located on the East Bank of Yitong River, 180m north of Changxin bridge and 10m south of Sihua bridge, covering an area of 19.5ha.

2、 Governance objectives

The design water inflow of the project is 60000 m3 / D, divided into two systems: Dongtang and Xitang. The design water inflow of Dongtang is 50000 m3 / D and that of Xitang is 10000 m3 / d.
The specific inlet and outlet water concentrations are as follows:

Water quality design of xueronghua Park sihuaqiao oxidation pond project

index	BOD5	CODcr	Ammonia nitrogen	TP
Inlet water quality（mg/L）	≤20	≤60	≤3.5	≤0.6
Effluent quality（mg/L）	≤6	≤30	≤1.5	≤0.3
Removal rate%	70	50	57.1	50

3、 Process flow

Water intake well → pump station → waterfall → aeration pond → primary facultative pond (reed pond) → secondary facultative pond (ecological stabilization pond) → effluent
Aeration pond is mainly used for water oxygenation, mainly for removing organic matters, providing sufficient oxygen for microbial treatment, increasing microbial attachment area and enhancing microbial treatment effect.
Reed pond is mainly used to increase microbial attachment area and remove organic matter, nitrogen and phosphorus in water.
Stabilization pond is mainly used to stabilize water quality and remove organic matter, nitrogen and phosphorus in water.
The ecological pond is mainly used to remove the remaining organic matter, nitrogen and phosphorus in the water.