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Mesophilic and thermophilic aerobic digestion of municipal sludge in an airlift U-shape bioreactor
AbstractAerobic digestion of primary and secondary sludges was studied in airlift bioreactors at mesophilic and thermophilic temperatures. The experimental studies were conducted with a laboratory U-shape airlift reactor (operating volume 23 liters) and in a pilot U-shape airlift reactor of 1150 liters operating volume. In the laboratory reactor, with cold (6°C) and concentrated (3–4% solids) feed of primary and secondary municipal sludge, a 30% volatile suspended solids (VSS) reduction was achieved with a hydraulic retention time (HRT) of 2·5 days. A VSS loading rate of 8·2 kg VSS/m3/day was achieved. This loading is comparable to that obtained in a pure-oxygen sparged, mixed reactor. In the pilot-plant reactor at mesophilic temperature (31–33°C), a VSS loading rate of 7·9 kg VSS/m3/day and a VSS reduction of 40% were achieved with a HRT of 4 days.
Mesophilic and thermophilic aerobic digestion of municipal sludge in an airlift U-shape bioreactor
AbstractAerobic digestion of primary and secondary sludges was studied in airlift bioreactors at mesophilic and thermophilic temperatures. The experimental studies were conducted with a laboratory U-shape airlift reactor (operating volume 23 liters) and in a pilot U-shape airlift reactor of 1150 liters operating volume. In the laboratory reactor, with cold (6°C) and concentrated (3–4% solids) feed of primary and secondary municipal sludge, a 30% volatile suspended solids (VSS) reduction was achieved with a hydraulic retention time (HRT) of 2·5 days. A VSS loading rate of 8·2 kg VSS/m3/day was achieved. This loading is comparable to that obtained in a pure-oxygen sparged, mixed reactor. In the pilot-plant reactor at mesophilic temperature (31–33°C), a VSS loading rate of 7·9 kg VSS/m3/day and a VSS reduction of 40% were achieved with a HRT of 4 days.
Mesophilic and thermophilic aerobic digestion of municipal sludge in an airlift U-shape bioreactor
Tyagi, R.D. (author) / Tran, F.T. (author) / Agbebavi, T.J. (author)
Biological Wastes ; 31 ; 251-266
1989-07-10
16 pages
Article (Journal)
Electronic Resource
English
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