5 Colo. Code Regs. § 1002-84.8
Current through Register Vol. 47, No. 11, June 10, 2024
Section 5 CCR 1002-84.8 - ADDITIONAL FILTRATION AND DISINFECTION REQUIREMENTS FOR USE OF RECLAIMED WATER PRODUCED FROM CENTRALIZED SYSTEMS (CATEGORY 3 PLUS)(A) The Treater must properly operate and maintain all required treatment systems when producing reclaimed water in accordance with this regulation, the Treater Authorization, and the site location and design approvals.(B) In addition to the factors to be considered and approved by the Division under Regulation #22, the following filtration and disinfection requirements apply to reclaimed water produced from centralized systems specifically for Category 3 uses of indoor toilet and urinal flushing, NonCommercial Food Crop Growing Operation, and Resident-Controlled Food Crop Irrigation Sites. In the event of a conflict between Regulation #22 and the following filtration and disinfection requirements, the following requirements shall control over any conflicting filtration and disinfection requirements in Regulation #22: (1) In addition to the requirements listed in 84.7(C), the Treater must properly operate filtration and disinfection of secondary treated wastewater while producing reclaimed water that reliably achieves all of the following:(a) Disinfection that provides a minimum of 99.999 (5-log) inactivation of enteric viruses by at least one of the following treatment techniques. (i) For free chlorine or monochloramines, log inactivation of viruses to be determined as referenced in 5-CCR-1002-11 and defined by the USEPA for disinfection of surface water (Hepatitis A).(ii) Minimum UV of 40 mJ/cm2 using a validated reactor per the Ultraviolet Disinfection Guidance Manual for the Final Long Term 2 Enhanced Surface Water Treatment Rule (November 2006). (b) Filtration by any one of the following treatment techniques:(i) Conventional or direct filtration.(ii) Membrane filtration accepted for use by the division in accordance with section 11.8 of 5 CCR 1002-11.(iii) Bag or cartridge filtration accepted for use by the division in accordance with section 11.8 of 5 CCR 1002-11.(iv) Alternative filtration technologies accepted by the Division in accordance with Wastewater Design Criteria Alternative Technology Acceptance that is third party challenge tested to reliably remove 99.9% of challenge particles that are at most 3 micron diameter.(c) The Treater must return any recycled spent filter backwash water, thickener supernatant, or liquids from the dewatering process to a location within the treatment process that is before the filtration technology or an alternative Division-approved location. (i) For conventional or direct filtration, the location of return must be prior to the coagulant feed location.(ii) For all other filtration technologies, the location of return must be prior to the filtration process and approved by the Division.41 CR 21, November 10, 2018, effective 11/30/201842 CR 23, December 10, 2019, effective 1/14/202043 CR 17, September 10, 2020, effective 9/30/202045 CR 14, July 25, 2022, effective 8/14/2022