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TITLE 30ENVIRONMENTAL QUALITY
PART 1TEXAS COMMISSION ON ENVIRONMENTAL QUALITY
CHAPTER 312SLUDGE USE, DISPOSAL, AND TRANSPORTATION
SUBCHAPTER DPATHOGEN AND VECTOR ATTRACTION REDUCTION
RULE §312.83Vector Attraction Reduction

(a) Compliance requirements.

  (1) One of the vector attraction reduction requirements in subsection (b)(1) - (10) of this section shall be met when bulk sewage sludge is applied to agricultural land, forest, a public contact site, or a reclamation site.

  (2) One of the vector attraction reduction requirements in subsection (b)(1) - (8) of this section shall be met when bulk sewage sludge is applied to a lawn, home garden, or is sold or given away in a bag or other container.

  (3) One of the vector attraction reduction requirements in subsection (b)(1) - (11) of this section shall be met when sewage sludge (other than domestic septage) is placed on an active sewage sludge unit.

  (4) One of the vector attraction reduction requirements in subsection (b)(9), (10), or (12) of this section shall be met when domestic septage is applied to agricultural land, forest, or a reclamation site.

  (5) One of the vector attraction reduction requirements in subsection (b)(9) - (12) of this section shall be met when domestic septage is placed on an active sewage sludge unit.

(b) Compliance alternatives.

  (1) The mass of volatile solids in the sewage sludge shall be reduced by a minimum of 38%.

  (2) If an anaerobically digested sewage sludge cannot meet the 38% volatile solids reduction requirement in paragraph (1) of this subsection, vector attraction reduction can be demonstrated by digesting a portion of the previously digested sewage sludge anaerobically in a laboratory in a bench-scale unit for 40 additional days at a temperature between 30 and 37 degrees Celsius. If at the end of the 40 days, the volatile solids in the sewage sludge at the beginning of that period is reduced by less than 17%, vector attraction reduction is achieved.

  (3) If an aerobically digested sewage sludge cannot meet the 38% volatile solids reduction requirement in paragraph (1) of this subsection, vector attraction reduction can be demonstrated by digesting a portion of the previously digested sewage sludge that has a percent solids of 2.0% or less aerobically in a laboratory in a bench-scale unit for 30 additional days at 20 degrees Celsius. If at the end of the 30 days, the volatile solids in the sewage sludge at the beginning of that period is reduced by less than 15%, vector attraction reduction is achieved.

  (4) The specific oxygen uptake rate (SOUR) for sewage sludge 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.

  (5) Sewage sludge shall be treated in an aerobic process for 14 days or longer. During that time, the temperature of the sewage sludge shall be higher than 40 degrees Celsius and the average temperature of sewage sludge shall be higher than 45 degrees Celsius.

  (6) The pH of sewage sludge 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 remain at a pH of 11.5 or higher for an additional 22 hours.

  (7) The percent solids of sewage sludge 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.

  (8) The percent solids of sewage sludge 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.

  (9) Sewage sludge shall be injected below the surface of the land. No significant amount of the sewage sludge shall be present on the land surface within one hour after the sewage sludge is injected. If the sewage sludge that is injected below the surface of the land is Class A or Class AB with respect to pathogens, as described in §312.82 of this title (relating to Pathogen Reduction), the sewage sludge shall be injected below the land surface within eight hours after the sewage sludge is discharged from the pathogen treatment process.

  (10) Sewage sludge applied to the land surface or placed on a surface disposal site shall be incorporated into the soil within six hours after application or placement on the land. If the sewage sludge that is incorporated into the soil is Class A or Class AB with respect to pathogens, as described in §312.82 of this title, the sewage sludge shall be applied to or placed on the land within eight hours after the sewage sludge is discharged from the pathogen treatment process.

  (11) Sewage sludge placed on an active sewage sludge unit shall be covered with soil or other material at the end of each operating day.

  (12) The pH of domestic septage shall be raised to 12 or higher by alkali addition and, without the addition of more alkali, shall remain at 12 or higher for 30 minutes.


Source Note: The provisions of this §321.83 adopted to be effective October 13, 1995, 20 TexReg 7840; amended to be effective October 2, 2014, 39 TexReg 7756

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