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Aerobic Digestion Research Paper

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Aerobic digestion In aerobic digestion, sludge stabilization is achieved when aerobic and facultative microorganisms convert biodegradable organic matter in an environment where aeration is provided. End products of the digestion are mainly carbon dioxide, water and non-biodegradable materials. The advantages of aerobic over anaerobic digestion include: • a process that is more readily controlled, • a better quality supernatant is produced, • solids produced are more acceptable for final disposal, • achieve comparable volatile solids reduction in shorter retention times The major disadvantages are: • higher power cost • (solids produced have poorer dewatering characteristics • aerobic digestion is more temperature dependent since the digesters …show more content…

The function of aerobic digestion is to stabilize waste sludge solids by long term aeration, thereby reducing BOD and destroying volatile solids. A process flow schematic for an aerobic digester system is shown in the next illustration. In this operation, sludge is pumped directly from the thickening operation to the aerobic digester. The aeration tank operates at a fixed level, with the overflow normally going to a solids/liquid separation unit (secondary thickener), where the stabilized sludge is separated from clarified effluent. A portion of the thickened and stabilized sludge from the solids/liquid separator is recycled back to the digestion tank, while the remainder is removed for further …show more content…

The pre ATAD sludge thickening is sometimes accomplished jointly with primary solids removal. Waste activated sludge is pumped to the primary DAF for thickening and removal with the primary sludge. This sludge is then delivered to the ATAD system A feed solids concentration of 3–5% has been established to limit excessive reactor cooling at concentrations below 3% and to limit excessive foaming in the reactors which occurs at concentrations >5%. The minimum VSS removal efficiency is 35–45%. The established hydraulic detention time is 5 to 6 days (2.5-3 days per reactor) to satisfy process requirements of 40% destruction of total organic solids; 60% of this destruction is reported to occur in the first reactor. The 2 reactor series configuration is used to provide a means of isolation of the digested sludge from contamination by incoming raw sludge. Batch feeding of the system is established by design intent and is reflected in the size of the sludge feed pump, which is sized to deliver the daily sludge volume to the ATAD within one

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