| Includes | sludge digestion, sludge pasteurization, and other types of residuals stabilization. 46 73 19 may include sediment traps (condensate pots), digester vacuum and pressure relief equipment not included in 43 33 33, sampling hatches, access hatches, and other items integral to a digester system. 46 73 33, confined gas mixing system, may include gas lift systems and gas piston systems. 46 73 34, unconfined gas mixing system, may include lance type gas mixing system and bottom diffuser systems. 46 73 41 may include digester heat exchangers and combination boiler/heat exchanger systems, and appurtenances. |
| Alternate Terms/Abbreviations | ATAD: autothermal thermophilic aerobic digestion. |
| Notes | tanks associated with certain types of sludge digestion and sludge stabilization are typically under the Division of the associated tank material or work result (such as Division 03, Concrete), or in 43 41 00, atmospheric tanks and vessels, or any other appropriate Division. |
| See | 23 50 00 for boilers and appurtenances for digester heating. 40 90 00 for process controls, and flow measurement instrumentation. 42 11 00 for process boilers for industrial processes. 42 13 00 for industrial heat exchangers and recuperators. 43 11 00 for blowers used in aerobic digestion. 43 12 00 for digester gas compressors. 43 13 00 for digester gas processing equipment. 43 42 26 for digester gas storage spheres. 44 30 00 for odor control equipment. 44 55 00 for composting equipment for water and wastewater residuals, yard waste, and other biodegradable materials. 46 36 00 for dry chemical feed equipment for lime stabilization and other dry chemicals used in alkaline stabilization. 46 41 00 for mechanical mixing equipment for digesters. 46 41 21 for jet mixing equipment. 46 76 00 for sludge drying and thermal stabilization equipment. 46 78 73 for thermal oxidation equipment. |