Arizona Administrative Code › Title 18 - ENVIRONMENTAL QUALITY › Chapter 9 - DEPARTMENT OF ENVIRONMENTAL QUALITY - WATER POLLUTION CONTROL › Article 10 - ARIZONA POLLUTANT DISCHARGE ELIMINATION SYSTEM - DISPOSAL, USE, AND TRANSPORTATION OF BIOSOLIDS › Section R18-9-1010 - Vector Attraction Reduction

Current through Register Vol. 30, No. 28, July 12, 2024
A.
				Except as provided in subsection (B), an applicator or person who prepares
				biosolids shall use one of the following vector attraction reduction procedures
				if biosolids are land-applied:
1. Reducing
				the mass of volatile solids by a minimum of 38% using the calculation
				procedures established in "Environmental Regulations and Technology -- Control
				of Pathogens and Vector Attraction in Sewage Sludge," EPA/625/R-92-013,
				published by the U.S. Environmental Protection Agency, Cincinnati, Ohio 45268,
				1999 edition. This material is incorporated by reference, does not include any
				later amendments or editions of the incorporated matter, and is on file with
				the Department and the Office of the Secretary of State;
2. If the 38% volatile solids reduction
				cannot be met for anaerobically digested biosolids the reduction can be met by
				digesting a portion of the previously digested material anaerobically in a
				laboratory in a bench-scale unit for 40 additional days at a temperature
				between 30° C and 37° C. Vector attraction reduction is achieved if, at
				the end of the 40 days, the volatile solids in the material at the beginning of
				the period are reduced by less than 17%;
3. If the 38% volatile solids reduction
				cannot be met for aerobically digested biosolids, the reduction can be met by
				digesting a portion of the previously digested material, which has a percent
				solids of 2% or less, aerobically in a laboratory in a bench-scale unit for 30
				additional days at 20° C. Vector attraction reduction is achieved if, at
				the end of the 30 days, the volatile solids in the material at the beginning of
				the period are reduced by less than 15%;
4. Treat the biosolids in an aerobic process
				during which the specific oxygen uptake rate (SOUR) is equal to or less than
				1.5 milligrams of oxygen per hour per gram of total solids (dry-weight basis)
				at 20° C;
5. Treat the
				biosolids in an aerobic process for 14 days or longer, during which the
				temperature of the biosolids is higher than 40° C and the average
				temperature of the biosolids is higher than 45° C;
6. Raising the pH of the biosolids to 12 or
				higher by alkali addition and, without the addition of more alkali, remain at
				12 or higher for two hours and at 11.5 or higher for an additional 22
				hours;
7. The percent solids of the
				biosolids that do not contain unstabilized solids generated in a primary
				wastewater treatment process is equal to or greater than 75% based on the
				moisture content and total solids before mixing with other materials;
8. The percent solids of the biosolids
				containing unstabilized solids generated in a primary wastewater treatment
				process are equal to or greater than 90% based on the moisture content and
				total solids before mixing with other materials;
9. Injecting the biosolids below the surface
				of the land so that no significant amount of biosolids is present on the land
				surface one hour after injection. If the biosolids meet Class A pathogen
				reduction, injection shall occur within eight hours after being discharged from
				a Class A pathogen treatment process; or
10. Incorporating the biosolids into the soil
				within six hours after application. If the biosolids meet Class A pathogen
				reduction, application shall occur within eight hours after being discharged
				from a Class A pathogen treatment process.