Effect of autothermal treatment on anaerobic digestion in the dual digestion process

Ward, A. R.; Stensel, H. David; Ferguson, John F.; Ma, Gregory; Hummel, Stan

doi:10.1016/s0273-1223(98)00721-5

Cited by 7 publications

(1 citation statement)

References 3 publications

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“…Our goal was to transform the waste sludge into Class A biosolids (detention time of 30 min at 708C or 4 hours at 558C-US EPA 1992), therefore thermophilic digestion was a sensible choice. There are a variety of processes of thermophilic aerobic digestion which have been reported in literature: from conventional thermophilic aerobic digestion to autothermal aerobic processes either single used (Riley & Forster 2002) or used as a pre-stage to conventional anaerobic digestion (Messenger et al 1993a;Ward et al 1998). All these processes are operated continuously or semi-continuously.…”

Section: Introductionmentioning

confidence: 99%

Municipal waste sludge digestion in an autothermal aerobic sequencing batch reactor

Zupanèiè

Grilc

Roš

et al. 2008

Water Science and Technology

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An autothermal aerobic sequencing batch process for sludge digestion and "class A" biosolids production was developed. The process was tested in laboratory and pilot scale size up to 150 PE, which can be considered a full scale size in some cases. In this process the maximum temperatures of 61.2 degrees C and 60.2 degrees C were achieved in laboratory scale in pilot scale equipment, respectively. The degradation efficiency of total chemical oxygen demand of sludge was between 50 and 70%. Similar results were achieved using pure oxygen in laboratory scale and oxygen/air mixture 1:1 by volume. The reactor scale greatly affects the achievement of thermophilic temperature. In smaller sizes the convective heat losses are the prevailing heat sink and the process is unable to produce enough heat to reach thermophilic temperature. Larger systems produce excess heat and can be installed with less intense aeration systems. The limit of air aeration system is at the size of about 500 PE.

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Section: Introductionmentioning

confidence: 99%