Biological regeneration of powdered activated carbon added to activated sludge units

Powdered activated carbon equilibrium concentrations of 0, 50, 300 and 1000 mg l −1 were studies in plug-flow activated sludge units maintained at sludge ages of 3, 5, 10 and 15 days. It was noted that the percentage removal of the effluent organic matter with respect to that of a control unit incre...

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Bibliographic Details
Published in:Water research (Oxford) 1977, Vol.11 (5), p.439-446
Main Authors: DeWalle, Foppe B., Chian, Edward S.K.
Format: Article
Language:English
Subjects:
environmental science
natural resource management
pollution
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Summary:Powdered activated carbon equilibrium concentrations of 0, 50, 300 and 1000 mg l −1 were studies in plug-flow activated sludge units maintained at sludge ages of 3, 5, 10 and 15 days. It was noted that the percentage removal of the effluent organic matter with respect to that of a control unit increased with increasing carbon equilibrium concentration. At a given activated carbon equilibrium concentration the COD removal tended to be independent of sludge age. Freundlich isotherms showed that the apparent adsorptive capacity gradually increased with increasing solids retention time, possibly caused by partial biological regeneration of the carbon. The regeneration is determined by the ratio of biological solids to carbon solids. A preliminary model was formulated to describe the relation between the daily regenerated adsorptive capacity and influent organic matter concentration.
ISSN:0043-1354
1879-2448
DOI:10.1016/0043-1354(77)90085-9