Okla. Admin. Code § 252:656-19-1
This Subchapter establishes design criteria for converting sludge from municipal wastewater treatment processes to biosolids that will meet at least one of the processes to significantly reduce pathogens ("PSRPs") (Class B) of the State and Federal requirements for land application and landfilling. Sludge may ultimately be beneficially reused or disposed in a landfill. All methods of off-site and on-site sludge reuse and disposal are subject to 40 CFR Part 503 as adopted by reference in OAC 252:606, and to OAC 252:521 if landfilled. Processes to further reduce pathogens ("PFRPs") (Class A) may be proposed and will be evaluated and approved using a composting procedure pursuant to the requirements of OAC 252:606. Any other process from converting municipal sludge to biosolids will be reviewed and may be approved by the DEQ on a case by case basis. A sludge management plan shall be approved by the DEQ before any construction permit for a new or upgraded wastewater treatment facility can be issued. On-site sludge dewatering facilities shall be provided for all plants although the following requirements may be reduced with on-site liquid sludge storage facilities or approved off-site sludge disposal. For calculating design sludge handling and disposal needs for sludge stabilization processes, a rational basis of design for sludge production values shall be developed and provided to the reviewing authority for approval on a case-by-case basis.
Okla. Admin. Code § 252:656-19-1