Section 250-RICR-150-10-3.30 - Appendix 3 - Vector Attraction Reduction RequirementsA. Reduction in Volatile Solids Content. The mass of volatile solids in the sewage sludge shall be reduced by a minimum of 38 percent (see calculation procedures in "Environmental Regulations and Technology, Control of Pathogens and Vector Attraction in Sewage Sludge", EPA/625/R-92/013, July 2003, U.S. Environmental Protection Agency, Cincinnati, Ohio 45268).B. Additional Digestion of Anaerobically Digested Biosolids. When the 38 percent volatile solids reduction requirement in option A cannot be met for an anaerobically digested sewage sludge, vector attraction reduction can be demonstrated by digest-ing a portion of the previously digested sewage sludge anaerobically in the laboratory in a bench-scale unit for 40 additional days at a temperature between 30°C and 37°C. When 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 percent, vector attraction reduction is achieved.C. Additional Digestion of Aerobically Digested Biosolids. When the 38 percent volatile solids reduction requirement in option A cannot be met for an aerobically digested sewage sludge, vector attraction reduction can be demonstrated by digesting a portion of the previously digested sewage sludge that has a percent solids of 2 percent or less aerobically in the laboratory in a bench-scale unit for 30 additional days at 20°C. When 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 percent, vector attraction reduction is achieved.D. Specific Oxygen Uptake Rate (SOUR) for Aerobically Digested Biosolids. 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°C.E. Aerobic Processes at Greater Than 40°C. 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°C and the average temperature of the sewage sludge shall be higher than 45°C.F. Addition of Alkaline Material. 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 at 11.5 or higher for an additional 22 hours. PH measurements shall be performed at 25°C or corrected to 25°C.G. Moisture Reduction of Biosolids Containing No Unstabilized Solids. Sewage sludge shall not contain unstabilized solids generated during primary treatment and the solids content of the sewage sludge shall be at least 75 percent before the sewage sludge is mixed with other materials. The solids content of the sewage sludge shall be achieved by removing water, not by adding inert materials.H. Moisture Reduction of Biosolids Containing Unstabilized Solids. Solids content of the sewage sludge shall be at least 90 percent, regardless of whether the sewage sludge is from primary treatment. The solids content of the sewage sludge shall be achieved by removing water, not by adding inert materials. The sewage sludge shall not be exposed to high humidity prior to use or disposal to prevent the outer surface of the sewage sludge from gaining moisture content.I. Biosolids Injection: 1. Sewage sludge shall be injected below the surface of the land, and,2. No significant amount of the sewage sludge shall be present on the land surface within 1 hour after the sewage sludge is injected, and,3. When the sewage sludge that is injected below the surface of the land meets the pathogen limits in Appendix 5, § 3.32 of this Part, the sewage sludge shall be injected below the land surface within 8 hours after being discharged from the pathogen reduction process.J. Incorporation of Biosolids into the Soil: 1. Sewage sludge applied to the land surface or placed on a surface disposal site shall be incorporated into the soil within 6 hours after application to or placement on the land, and,2. When sewage sludge that is incorporated into the soil meets the pathogen limits in § 3.32 of this Part, the sewage sludge shall be applied to or placed on the land within 8 hours after being discharged from the pathogen reduction process.K. Covering Sludge (Land Disposal Only). Sewage sludge placed on a surface disposal site shall be covered with soil or other material at the end of each operating day.250 R.I. Code R. 250-RICR-150-10-3.30