Ariz. Admin. Code § 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.
Notes
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