u型气升式生物反应器中城市污泥的中温和嗜热好氧消化

R.D. Tyagi , F.T. Tran , T.J. Agbebavi
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引用次数: 23

摘要

在气升式生物反应器中,研究了中温和热温条件下初级和次级污泥的好氧消化。实验研究分别在实验室u型气升反应器(运行容积为23升)和中试u型气升反应器(运行容积为1150升)上进行。在实验室反应器中,以低温(6°C)和浓缩(3-4%固体)的初级和二级城市污泥为原料,在水力停留时间(HRT)为2.5天的情况下,挥发性悬浮固体(VSS)减少了30%。VSS加载速率达到8.2 kg VSS/m3/d。这种负荷可与在纯氧喷射混合反应器中获得的负荷相媲美。在中温(31-33°C)中试反应器中,在HRT为4天的情况下,VSS加载率为7.9 kg /m3/天,VSS减少了40%。
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Mesophilic and thermophilic aerobic digestion of municipal sludge in an airlift U-shape bioreactor

Aerobic 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.

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