Rainwater Recycling

Project Ⅰ

Project Background:

A Nanjing precision processing factory needs to recycle rainwater for plant green irrigation and toilet flushing. In 2018, SCHW undertook the company’s rainwater recycling project (100m³ rainwater recycling system), provided equipment such as discharging equipment, rainwater reservoir and quartz sand filter. Besides, SCHW also provided services such as engineering design, installation and commission.

Inlet and Outlet Water Quality:

Rainwater quality：

Parameters	Rainwater quality
COD（mg/L）	70~100
SS(mg/L)	20~40
Color（mg/L）	10~40
pH	6~9

Outlet Water Quality Needs to Achieve Urban Miscellaneous Water Standard:

Parameters	Toilet Flushing	Road Cleaning and extinguishing	City Green
pH	6.0~9.0
Color	≤30
Odor	Not Smelly
Turbidity	≤5	≤10	≤10
TDS	≤1500	≤1500	≤1000
BOD5	≤10	≤115	≤120
Ammonia Nitrogen（mg/L）	≤10	≤10	≤20
Anionic Surfactant（mg/L）	≤1.0	≤1.0	≤1.0
Dissolved Oxygen（mg/L）	≥1.0
Total Residual Chlorine（mg/L）	After contacting 30min≥1.0，End of Pipe Network ≥0.2
Total coliform（cfu/L）	≤3

Processes: