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A. Z. Yaser and N. N. Safie
Table 6
(continued)
Reuse category and description
Treatment
Reclaimed water quality
Groundwater recharge by spreading into potable aquifers
Disinfection
Secondary
Filtration
Soil aquifer treatment
Disinfection
Secondary
Filtration
Soil aquifer treatment
pH—daily
Total coliform—daily
Cl2 residual—continuous
Drinking water standards—quarterly
Other—depends on constituent
TOC—weekly
Turbidity—continuous
Monitoring is not required for viruses and parasites: their removal rates are
prescribed by treatment requirements
Groundwater recharge by injection into potable aquifers
Secondary
Filtration
Disinfection
Advanced wastewater
treatment
Includes, but not limited to, the following:
No detectable
No detectable total coliform/100 ml
pH
= 6.5–8.5
1 mg/l Cl2 residual (min.)
≤2 NTU
≤2 mg/l TOC of wastewater origin
Meet drinking water standards
Secondary
Filtration Disinfection
Advanced wastewater
treatment
Includes, but not limited to, the following:
No detectable total coliform/100 ml (9, 10)
1 mg/l Cl2 residual (min.)
pH
= 6.5–8.5
≤2 NTU (8)
≤2 mg/l TOC of wastewater origin
Meet drinking water standards
Source
2012 Guidelines for Water Reuse, United States Environmental Protection Agency (2012)