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Oklahoma Administrative Code (Last Updated: March 11, 2021) |
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TITLE 252. Department of Environmental Quality |
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Chapter 656. Water Pollution Control Facility Construction Standards |
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Subchapter 27. Water reuse |
SECTION 252:656-27-3. Treatment
Latest version.
- (a) Category 2 reclaimed water. Water reuse systems generating Category 2 reclaimed water shall include the following:(1) Secondary treatment. Asecondary suspended growth mechanical treatment process, or the equivalent approved by DEQ as a variance, capable of producing an effluent that conforms to the limits specified in Appendix A of OAC 252:627.(2) Nutrient removal. A process in accordance with OAC 252:656-16-3 that will remove nutrients to the level required based on the final use of the reclaimed water. Systems may be exempt from the requirement to remove nutrients when documentation is provided to show that nutrients are utilized based on the agronomic and/or crop uptake rates of the final use.(3) Coagulation. Coagulation with chemicals following the secondary treatment process.(A) Coagulation, chemical feed and storage equipment shall meet the requirements of OAC 252:626-9 and OAC 252:626-11; and(B) Rapid mix or inline static mixers shall be used to ensure the rapid dispersion and mixing of chemicals through the reclaimed water.(4) Filtration. Granular media effluent filtration in accordance with OAC 252:656-23-1.(5) Turbidimeters. Continuous online turbidimeters with recording devices installed following filtration and prior to disinfection.(6) Disinfection. Disinfection by chlorination or a combination of UV and chlorination in accordance with OAC 252:656-21 and OAC 252:656-3-4(b)(7)(C). The method of disinfection shall achieve:(A) 5-log removal or inactivation of Adenovirus type 15;(B) 5-log removal or inactivation of Salmonella typhimurium; and(C) 3-log removal or inactivation of Giardia lamblia.(b) Category 3 reclaimed water. Water reuse systems generating Category 3 reclaimed water shall include the following:(1) Secondary treatment. The secondary suspended growth mechanical treatment process, or the equivalent approved by DEQ as a variance, shall be capable of producing an effluent that conforms to the limits specified in Appendix A of OAC 252:627.(2) Nutrient removal. A process in accordance with OAC 252:656-16-3 that will remove nutrients to the level required based on the final use of the reclaimed water. Systems may be exempt from the requirement to remove nutrients when documentation is provided to show that nutrients are utilized based on the agronomic and/or crop uptake rates of the final use.(3) Disinfection. Disinfection by chlorination in conformance with OAC 252:656-21 at the point of entry into the distribution system.(c) Category 4 reclaimed water. Existing golf course land application systems generating Category 4 reclaimed water shall include the following:(1) Primary treatment. Primary treatment through a wastewater lagoon system designed in accordance with OAC 252:656-11 and OAC 252:656-25-2(g) and (h).(2) Disinfection. Chlorination in conformance with OAC 252:656-21 to disinfect the reclaimed water at the point of entry into the distribution system.(3) Storage detention time. Storage detention time following primary treatment in accordance with OAC 252:656-25-2(g).(d) Category 5 reclaimed water. Water reuse systems generating Category 5 reclaimed water shall include primary treatment through a wastewater lagoon system designed in accordance with OAC 252:656-11 and OAC 252:656-25-2(g) and (h).