North Carolina Administrative Code › Title 15A - Environmental Quality › Chapter 02 - Environmental Management › Subchapter T - WASTE NOT DISCHARGED TO SURFACE WATERS › Section .1100 - RESIDUALS MANAGEMENT › Section 02T .1107 - VECTOR ATTRACTION REDUCTION REQUIREMENTS

Current through Register Vol. 39, No. 2, July 15, 2024
(a) Biological residuals shall not be land
				  applied unless the requirements of one of the following vector attraction
				  reduction alternatives have been met:
(1)
				  38-Percent Volatile Solids Reduction. The mass of the volatile solids in the
				  biological residuals shall be reduced by 38 percent between the time that the
				  biological residuals enter the digestion process and the time it is land
				  applied;
(2) 40-Day Bench Scale
				  Test. A portion of previously anaerobically-digested biological residuals shall
				  be further anaerobically-digested in the laboratory in a bench-scale unit for
				  40 additional days at a temperature between 30 and 37 degrees Celsius. The
				  volatile solids in the biological residuals shall be reduced by less than 17
				  percent as measured from the beginning to the end of the test;
(3) 30-Day Bench Scale Test. A portion of
				  previously aerobically-digested biological residuals shall be further
				  aerobically-digested in the laboratory in a bench-scale unit for 30 additional
				  days at a temperature of 20 degrees Celsius. The previously
				  aerobically-digested biological residuals shall either have a concentration of
				  two percent total solids or less or shall be diluted with effluent down to two
				  percent total solids at the start of the test. The volatile solids in the
				  biological residuals shall be reduced by less than 15 percent as measured from
				  the beginning to the end of the test;
(4) Specific Oxygen Uptake Rate Test. The
				  specific oxygen uptake rate (SOUR) for biological residuals treated in an
				  aerobic process shall be equal to or less than 1.5 milligrams of oxygen per
				  hour per gram of total solids on a dry weight basis corrected to a temperature
				  of 20 degrees Celsius;
(5) 14-Day
				  Aerobic Processes. The biological residuals shall be treated in an aerobic
				  process for 14 days or longer. During that time the temperature of the
				  biological residuals shall be higher than 40 degrees Celsius, and the average
				  temperature of the biological residuals shall be higher than 45 degrees
				  Celsius;
(6) Alkaline
				  Stabilization. The pH of the biological residuals shall be raised to 12 or
				  higher by alkali addition and, without the addition of more alkali, shall
				  remain at 12 or higher for two hours and then at 11.5 or higher for an
				  additional 22 hours;
(7) Drying of
				  Stabilized Residuals. The biological residuals shall be dried to 75 percent
				  total solids if the biological residuals contain no unstabilized solids from a
				  primary wastewater treatment process. The biological residuals shall not be
				  mixed with other materials to meet this requirement;
(8) Drying of Unstabilized Residuals. The
				  biological residuals shall be dried to 90 percent total solids if the
				  biological residuals contain unstabilized solids from a primary wastewater
				  treatment process. The biological residuals shall not be mixed with other
				  materials to meet this requirement;
(9) Injection.
(A) Class B biological residuals shall be
				  injected below the land surface in accordance with
				  40 CFR
				  503.33(b)(9)(ii);
				  and
(B) Class A biological
				  residuals shall be injected below the land surface within eight hours after
				  being discharged from the pathogen treatment process; or
(10) Incorporation.
(A) Class B biological residuals shall be
				  incorporated into the soil within six hours after land application;
				  and
(B) Class A biological
				  residuals shall be land applied within eight hours after being discharged from
				  the pathogen treatment process.