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