Ariz. Admin. Code § 18-9-1010

Current through Register Vol. 30, No. 50, December 13, 2024

Section R18-9-1010 - Vector Attraction Reduction

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.

B. Biosolids that are sold or given away in a bag or other container, or are applied to a lawn or home garden, shall meet one of the vector attraction reduction alternatives established in subsections (A)(1) through (A)(8).

C. For domestic septage, vector attraction reduction is met by one of the following methods:

1. By injecting as specified in subsection (A)(9);

2. By incorporating as specified in subsection (A)(10); or

3. By raising the pH of the domestic septage to 12 or higher through the addition of alkali and, without the addition of more alkali, holding the pH at 12 or higher for at least 30 minutes.

Ariz. Admin. Code § R18-9-1010

New Section recodified from R18-13-1510 at 7 A.A.R. 2522, effective May 24, 2001 (Supp. 01-2). Former Section R18-9-1010 renumbered to R18-9-1011; new Section R18-9-1010 renumbered from R18-9-1009 and amended by final rulemaking at 7 A.A.R. 5879, effective December 7, 2001 (Supp. 01-4).