Stabilization of waste-activated sludge through the anoxic-aerobic digestion process
During the aerobic digestion process, the nitrogen which had been embedded in the activated sludge is solubilized to form ammoniacal and nitric nitrogen which are in turn transferred to the liquor and cause the increase of nitrogen loading in the sewage treatment plant. In this study, the anoxic-aerobic sludge digestion system which is a modified form of the conventional aerobic sludge digestion is made up of aerobic and anoxic tanks and are designed to remove both the volatile suspended solids and the total nitrogen (TN) simultaneously. The removal efficiencies of both VSS and TN were investigated by feeding waste-activated sludge continuously and semicontinuously. The maximum percent reduction of both VSS and TN was achieved at a Q /SUB r/ /Q /SUB s/ ratio of 2 in the continuous process. The semicontinuous process was used to improve the nitrogen removal efficiency further. In the semicontinuous process, the VSS reduction efficiency as well as the nitrogen removal efficiency increased remarkably under a constant Q /SUB r/ /Q /SUB s/ ratio of 2. This process also achieved a VSS reduction efficiency higher than the aerobic digestion process (control). It was suggested that the additional anoxic tank enhanced the sludge digestion. Furthermore, the anoxic-aerobic digestion system can be applied to other treatment media like the primary sludge, industrial sludge, animal manure, etc.
- OSTI ID:
- 6127885
- Journal Information:
- Biotechnol. Bioeng.; (United States), Journal Name: Biotechnol. Bioeng.; (United States) Vol. XXIV:8; ISSN BIBIA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420900* -- Engineering-- Waste Processing Plants & Equipment-- (-1989)
AEROBIC DIGESTION
AMMONIA
CHEMICAL REACTIONS
CONTAINERS
DIGESTION
ELEMENTS
HYDRIDES
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
MANAGEMENT
MATTER
NITROGEN
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
PROCESSING
REDUCTION
REMOVAL
SLUDGES
STABILIZATION
TANKS
VOLATILE MATTER
WASTE MANAGEMENT
WASTE PROCESSING
WASTE PROCESSING PLANTS