Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 15 - USE OF SURFACE DISPOSAL OF BIOSOLIDS, APP. A-C › Part C - SURFACE DISPOSAL › Section 32 - Vector attraction reduction

Current through July 13, 2024
(a) One of the
				  vector attraction reduction requirements in Section 32(f) through (p) shall be
				  met when bulk biosolids are applied to agricultural land, forest, a public
				  contact site, or a reclamation site.
(b) One of the vector attraction reduction
				  requirements in Section 32(f) through (m) shall be met when bulk biosolids are
				  applied to a lawn or a home garden.
(c) One of the vector attraction reduction
				  requirements in Section 32(f) through (m) shall be met when biosolids are sold
				  or given away in a bag or other container for application to the
				  land.
(d) One of the vector
				  attraction reduction requirements in Section 32(f) through (q) shall be met
				  when biosolids (other than domestic septage) are placed on an active biosolids
				  unit.
(e) One of the vector
				  attraction reduction requirements in Section 32(n), (o) and (p), or (r) shall
				  be met when domestic septage is applied to agricultural land, forest, or a
				  reclamation site and one of the vector attraction reduction requirements in
				  Section 32(n) through (r) shall be met when domestic septage is placed on an
				  active biosolids unit. Compliance with the conditions of a General Statewide
				  Permit for Land Application of Domestic Sewage In Remote Areas satisfies the
				  requirements of this section.
(f)
				  The mass of volatile solids in the biosolids shall be reduced by a minimum of
				  38%.
(g) When the 38% volatile
				  solids reduction requirement in Section 32(f) cannot be met for an
				  anaerobically digested biosolids, vector attraction reduction can be
				  demonstrated by digesting a portion of the previously digested biosolids
				  anaerobically in the laboratory in a bench-scale unit for 40 additional days at
				  a temperature between 30 and 37 degrees Celsius. When at the end of the 40
				  days, the volatile solids in the biosolids at the beginning of that period is
				  reduced by less than 17%, vector attraction reduction is achieved.
(h) When the 38% volatile solids reduction
				  requirement in Section 32(f) cannot be met for an aerobically digested
				  biosolids, vector attraction reduction can be demonstrated by digesting a
				  portion of the previously digested biosolids that has a percent solids of two
				  percent (2%) or less aerobically in the laboratory in a bench-scale unit for 30
				  additional days at 20 degrees Celsius. When at the end of the 30 days, the
				  volatile solids in the biosolids at the beginning of that period is reduced by
				  less than 15%, vector attraction reduction is achieved.
(i) The specific oxygen uptake rate (SOUR)
				  for biosolids treated in an aerobic process shall be equal to or less than 1.5
				  milligrams of oxygen per hour per gram of total solids (dry weight basis) at a
				  temperature of 20 degrees Celsius.
(j) Biosolids shall be treated in an aerobic
				  process for 14 days or longer. During that time, the temperature of the
				  biosolids shall be higher than 40 degrees Celsius and the average temperature
				  of the biosolids shall be higher than 45 degrees Celsius.
(k) The pH of biosolids 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.
(l) The
				  percent solids of biosolids that does not contain unstabilized solids generated
				  in a primary wastewater treatment process shall be equal to or greater than 75
				  % based on the moisture content and total solids prior to mixing with other
				  materials.
(m) The percent solids
				  of biosolids that contains unstabilized solids generated in a primary
				  wastewater treatment process shall be equal to or greater than 90% based on the
				  moisture content and total solids prior to mixing with other
				  materials.
(n) Biosolids shall be
				  injected below the surface of the land.
(i)
				  No significant amount of the biosolids shall be present on the land surface
				  within one hour after the biosolids are injected.
(ii) When the biosolids that are injected
				  below the surface of the land is Class A with respect to pathogens, the
				  biosolids shall be injected below the land surface within eight hours after
				  being discharged from the pathogen treatment process.