Table 8.
US EPA norms for agricultural uses of WW (
modified from EPA, 1992)
| Type of reuse | Treatment | Reclaimed water quality | Reclaimed water monitoring |
|---|---|---|---|
|
Urban Reuse All types of landscape irrigation (e.g. golf courses, parks, cemeteries) |
i. Secondary ii. Filtration iii. Disinfection |
pH = 6–9 ≤ 10 mgL−1 BOD ≤ 2 NTU No detectable FC/100 ml3 1 mgL−1 Cl2 residual (min.) |
pH—weekly BOD—weekly Turbidity—continuous Coliform—daily Cl2 residual -continuous |
|
Agricultural Reuse –Food Crops Not Commercially Processed Surface or spray irrigation of any food crop, including crops eaten raw |
i. Secondary ii. Filtration iii. Disinfection |
pH = 6–9 ≤ 10 mgL−1 BOD ≤ 2 NTU No detectable FC/100 ml3 1 mg/l Cl2 residual (min.) |
pH—weekly BOD—weekly Turbidity – continuous Coliform—daily Cl2 residual -continuous |
| Agricultural Reuse—Food Crops Commercially Processed |
i. Secondary ii. Disinfection |
pH = 6–9 ≤ 30 mgL−1 BOD ≤ 30 mgL−1 SS ≤ 200 FC/100 ml4 1 mgL−1 Cl2 residual (min.) |
pH–weekly BOD—weekly SS—daily Coliform—daily Cl2 residual -continuous |
| Types of Reuse | Treatment | Reclaimed Water Quality |
Reclaimed Water Monitoring |
| Agricultural Reuse—Non-Food CropsPasture for milking animals; fodder, fibre and seed crops |
i. Secondary ii. Disinfection |
pH = 6–9 ≤ 30 mgL−1 BOD ≤ 30 mgL−1 SS ≤ 200 FC/100 ml4 1 mgL−1 Cl2 residual (min.) |
pH—weekly BOD—weekly SS – daily Coliform—daily Cl2 residual -continuous |
*SS = suspended solids; FC = faecal coliforms