La. Admin. Code tit. 33 § VII-3007
Appendix D.1 | |
Processes to Significantly Reduce Pathogens | |
Aerobic Digestion | A process conducted by agitating solid waste with air or oxygen to maintain aerobic conditions at residence times ranging from 60 days at 15oC to 40 days at 20oC, with a volatile-solids reduction of at least 38 percent. |
Air Drying | A process that allows liquid waste to drain and/or dry on under-drained sand beds or on paved or unpaved basins in which the depth of the waste is 9 inches. A minimum of three months is needed for this process; during two of these months daily temperatures must average above 0o C. |
Anaerobic Digestion | A process conducted in the absence of air during a residence time ranging from 60 days at 20oC to 15 days at 35-55oC, with a volatile-solids reduction of at least 38 percent. |
Composting | A process conducted by the within-vessel, static-aerated-pile, or windrow method whereby the solid waste is maintained at minimum operating conditions of 40oC for five days. For four hours during this period, the temperature must exceed 55oC. |
Lime Stabilization | A process in which sufficient lime is added to produce a pH of 12 after two hours of contact. |
Other Methods | Other methods or operating conditions for significantly reducing pathogens may be acceptable if pathogens and vector attraction of the waste (volatile solids) are reduced to an extent equivalent to the reduction achieved by any of the above methods. |
Appendix D.2 | |
Processes to Further Reduce Pathogens | |
Composting | A process conducted by the within-vessel, static-aerated-pile, or windrow method. If the within-vessel or static-aerated-pile method is used, the solid waste is maintained at operating conditions of 55oC or greater for three days. If the windrow method is used, the solid waste attains a temperature of 55oC or greater for at least 15 days during the composting period, and the windrow is turned at least five times during this high-temperature period. |
Heat Drying | A process in which dewatered solid waste cake is dried by direct or indirect contact with hot gases and moisture content is reduced to 10 percent or less. Solid waste particles reach temperatures well in excess of 80o C or the wet-bulb temperature of the gas stream, in contact with the solid waste at the point where it leaves the dryer, is in excess of 80o C. |
Heat Treatment | A process in which liquid waste is heated to temperatures of 180o C for 30 minutes. |
Thermophilic Aerobic Digestion | A process in which liquid waste is agitated with air or oxygen to maintain aerobic conditions at residence times of 10 days at 55-60o C, with a volatile-solids reduction of at least 38 percent. |
Other Methods | Other methods or operating conditions for further reducing pathogens may be acceptable if pathogens and vector attraction of the waste (volatile solids) are reduced to an extent equivalent to the reduction achieved by any of the above methods. |
Any of the processes listed below, used in conjunction with the processes described above, will further reduce pathogens. The processes listed below will not, however, reduce the attraction of disease vectors if they are not used in conjunction with one of the above processes, and therefore are not sufficient alone. | |
Beta-Ray Irradiation | A process in which solid waste is irradiated with beta rays from an accelerator at dosages of at least 1.0 megarad at room temperature (ca. 20o C). |
Gamma-Ray Irradiation | A process in which solid waste is irradiated with gamma rays from certain isotopes, such as 60Cobalt and 137Cesium, at dosages of at least 1.0 megarad at room temperature (ca. 20o C). |
Pasteurization | A process in which solid waste is maintained for at least 30 minutes at a minimum temperature of 70o C. |
Other Methods | Other methods or operating conditions may be acceptable if pathogens are reduced to an extent equivalent to the reduction achieved by any of the above add-on methods. |
La. Admin. Code tit. 33, § VII-3007