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 31 - Pathogens

Current through July 13, 2024
(a) Biosolids - Class A.
(i) The requirement in Section 31(a) (ii) and
				  the requirements in either Section 31(a) (iii), (a) (iv), (a) (v), (a) (vi),
				  (a) (vii), or (a) (viii)shall be met for a biosolids to be classified Class A
				  with respect to pathogens.
(ii) The
				  Class A pathogen requirements in Section 31(a) (iii) through (viii) shall be
				  met either prior to meeting or at the same time the vector attraction reduction
				  requirements in Section 32, except the vector attraction reduction requirements
				  in Section 32(k) through (m), are met.
(iii) Class A - Alternative 1.
(A) Either the density of fecal coliform in
				  the biosolids shall be less than 1000 Most Probable Number per gram of total
				  solids (dry weight basis), or the density of
Salmonella
sp. bacteria in the biosolids shall be less
				  than three Most Probable Number per four grams of total solids (dry weight
				  basis) at the time the biosolids is used or disposed; at the time the biosolids
				  is prepared for sale or give away in a bag or other container for application
				  to the land; or at the time the biosolids or material derived from biosolids is
				  prepared to meet the requirements in Section 11(b) through (e), (g) or
				  (h).
(B) The temperature of the
				  biosolids that are used or disposed shall be maintained at a specific value for
				  a period of time.
(I) When the percent solids
				  of the biosolids is seven percent (7%) or higher, the temperature of the
				  biosolids shall be 50 degrees Celsius or higher; the time period shall be 20
				  minutes or longer; and the temperature and time period shall be determined
				  using equation (2), except when small particles of biosolids are heated by
				  either warmed gases or an immiscible liquid.
D =
131,700,000
Eq.(2)
100.1400t
Where,
D = time in days.
t = temperature in degrees Celsius.
(II) When the percent solids of the biosolids
				  is seven percent (7%) or higher and small particles of biosolids are heated by
				  either warmed gases or an immiscible liquid, the temperature of the biosolids
				  shall be 50 degrees Celsius or higher; the time period shall be 15 seconds or
				  longer; and the temperature and time period shall be determined using equation
				  (2).
(III) When the percent solids
				  of the biosolids is less than seven percent (7%) and the time period is at
				  least 15 seconds, but less than 30 minutes, the temperature and time period
				  shall be determined using equation (2).
(IV) When the percent solids of the biosolids
				  is less than seven percent (7%); the temperature of the biosolids is 50 degrees
				  Celsius or higher; and the time period is 30 minutes or longer, the temperature
				  and time period shall be determined using equation (3).
D = 50,070,000/100.1400t
					 Eq.(3)
Where,
D = time in days.
t = temperature in degrees Celsius.
(iv) Class A
				  - Alternative 2.
(A) Either the density of
				  fecal coliform in the biosolids shall be less than 1000 Most Probable Number
				  per gram of total solids (dry weight basis), or the density of
Salmonella
sp. bacteria in the biosolids shall be less
				  than three Most Probable Number per four grams of total solids (dry weight
				  basis) at the time the biosolids is used or disposed; at the time the biosolids
				  is prepared for sale or give away in a bag or other container for application
				  to the land; or at the time the biosolids or material derived from biosolids is
				  prepared to meet the requirements in Section 11(b) through (e), (g) or
				  (h).
(B) The pH of the biosolids
				  that is used or disposed shall be raised to above 12 and shall remain above 12
				  for 72 hours.
(C) The temperature
				  of the biosolids shall be above 52 degrees Celsius for 12 hours or longer
				  during the period that the pH of the biosolids is above 12.
(D) At the end of the 72 hour period during
				  which the pH of the biosolids is above 12, the biosolids shall be air dried to
				  achieve a percent solids in the biosolids greater than 50 %.
(v) Class A - Alternative 3.
(A) Either the density of fecal coliform in
				  the biosolids shall be less than 1000 Most Probable Number per gram of total
				  solids (dry weight basis), or the density of
Salmonella
sp. bacteria in biosolids shall be less
				  than three Most Probable Number per four grams of total solids (dry weight
				  basis) at the time the biosolids is used or disposed; at the time the biosolids
				  is prepared for sale or give away in a bag or other container for application
				  to the land; or at the time the biosolids or material derived from biosolids is
				  prepared to meet the requirements in Section 11(b) through (e), (g) or
				  (h).
(B) The biosolids shall be
				  analyzed prior to pathogen treatment to determine whether the biosolids contain
				  enteric viruses.
(C) When the
				  density of enteric viruses in the biosolids prior to pathogen treatment is less
				  than one Plaque-forming Unit per four grams of total solids (dry weight basis),
				  the biosolids is Class A with respect to enteric viruses until the next
				  monitoring episode for the biosolids.
(D) When the density of enteric viruses in
				  the biosolids prior to pathogen treatment is equal to or greater than one
				  Plaque-forming Unit per four grams of total solids (dry weight basis), the
				  biosolids are Class A with respect to enteric viruses when the density of
				  enteric viruses in the biosolids after pathogen treatment is less than one
				  Plaque-forming Unit per four grams of total solids (dry weight basis) and when
				  the values or ranges of values for the operating parameters for the pathogen
				  treatment process that produces the biosolids that meets the enteric virus
				  density requirement are documented.
(E) After the enteric virus reduction in (a)
				  (v) (D) of this subsection is demonstrated for the pathogen treatment process,
				  the biosolids continues to be Class A with respect to enteric viruses when the
				  values for the pathogen treatment process operating parameters are consistent
				  with the values or ranges of values documented in (a) (v) (D) of this
				  subsection.
(F) The biosolids shall
				  be analyzed prior to pathogen treatment to determine whether the biosolids
				  contains viable helminth ova.
(G)
				  When the density of viable helminth ova in the biosolids prior to pathogen
				  treatment is less than one per four grams of total solids (dry weight basis),
				  the biosolids is Class A with respect to viable helminth ova until the next
				  monitoring episode for the biosolids.
(H) When the density of viable helminth ova
				  in the biosolids prior to pathogen treatment is equal to or greater than one
				  per four grams of total solids (dry weight basis), the biosolids is Class A
				  with respect to viable helminth ova when the density of viable helminth ova in
				  the biosolids after pathogen treatment is less than one per four grams of total
				  solids (dry weight basis) and when the values or ranges of values for the
				  operating parameters for the pathogen treatment process that produces the
				  biosolids that meets the viable helminth ova density requirement are
				  documented.
(I) After the viable
				  helminth ova reduction in (a) (v) (C) of this subsection is demonstrated for
				  the pathogen treatment process, the biosolids continues to be Class A with
				  respect to viable helminth ova when the values for the pathogen treatment
				  process operating parameters are consistent with the values or ranges of values
				  documented in (a) (v) (C) of this subsection.
(vi) Class A - Alternative 4.
(A) Either the density of fecal coliform in
				  the biosolids shall be less than 1000 Most Probable Number per gram of total
				  solids (dry weight basis), or the density of
Salmonella
sp. bacteria in the biosolids shall be less
				  than three Most Probable Number per four grams of total solids (dry weight
				  basis) at the time the biosolids is used or disposed; at the time the biosolids
				  is prepared for sale or give away in a bag or other container for application
				  to the land; or at the time the biosolids or material derived from biosolids is
				  prepared to meet the requirements in Section 11(b) through (e), (g) or
				  (h).
(B) The density of enteric
				  viruses in the biosolids shall be less than one Plaque-forming Unit per four
				  grams of total solids (dry weight basis) at the time the biosolids is used or
				  disposed; at the time the biosolids is prepared for sale or give away in a bag
				  or other container for application to the land; or at the time the biosolids or
				  material derived from biosolids is prepared to meet the requirements in Section
				  11(b) through (e), (g) or (h), unless otherwise specified by the permitting
				  authority.
(C) The density of
				  viable helminth ova in the biosolids shall be less than one per four grams of
				  total solids (dry weight basis) at the time the biosolids is used or disposed;
				  at the time the biosolids is prepared for sale or give away in a bag or other
				  container for application to the land; or at the time the biosolids or material
				  derived from biosolids is prepared to meet the requirements in Section 11(b)
				  through (e), (g) or (h), unless otherwise specified by the permitting
				  authority.
(vii) Class A
				  - Alternative 5.
(A) Either the density of
				  fecal coliform in the biosolids shall be less than 1000 Most Probable Number
				  per gram of total solids (dry weight basis), or the density of
Salmonella
, sp. bacteria in the biosolids shall be
				  less than three Most Probable Number per four grams of total solids (dry weight
				  basis) at the time the biosolids is used or disposed; at the time the biosolids
				  is prepared for sale or give away in a bag or other container for application
				  to the land; or at the time the biosolids or material derived from biosolids is
				  prepared to meet the requirements in Section 11(b) through (e), (g) or
				  (h).
(B) Biosolids that are used or
				  disposed shall be treated in one of the Processes to Further Reduce Pathogens
				  described in Appendix B.
(viii) Class A - Alternative 6.
(A) Either the density of fecal coliform in
				  the biosolids shall be less than 1000 Most Probable Number per gram of total
				  solids (dry weight basis), or the density of
Salmonella
, sp. bacteria in the biosolids shall be
				  less than three Most Probable Number per four grams of total solids (dry weight
				  basis) at the time the biosolids is used or disposed; at the time the biosolids
				  is prepared for sale or give away in a bag or other container for application
				  to the land; or at the time the biosolids or material derived from biosolids is
				  prepared to meet the requirements in Section 11(b) through (e), (g) or
				  (h).
(B) Biosolids that are used or
				  disposed shall be treated in a process that is equivalent to a Process to
				  Further Reduce Pathogens, see Appendix B, as determined by the permitting
				  authority.