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Title: Control of odors arising from the thickening of surplus activated sludge in the dissolved air flotation unit
Authors: Koe, L.C.C. 
Tan, Y.G.
Issue Date: Oct-1987
Citation: Koe, L.C.C.,Tan, Y.G. (1987-10). Control of odors arising from the thickening of surplus activated sludge in the dissolved air flotation unit. Water, Air, and Soil Pollution 35 (3-4) : 387-393. ScholarBank@NUS Repository.
Abstract: This paper reports on investigations carried out to determine the feasibility of using various types of adsorbent medium to remove odors emitted during the thickening of surplus activated sludge by the dissolved air flotation (DAF) process. The performances of four different commercial grades of granular activated carbon and a grade of activated alumina were evaluated using a pilot facility set up at a local wastewater treatment plant. The odorous air directly above the DAF unit was pumped simultaneously through a set of columns each filled with the appropriate test adsorbent until odor breakthrough occurred. Air samples were collected at the inlet and outlet of each column and also at intermediate sampling ports located along the column. The odor concentration of air samples was assessed by dynamic olfactometry and the capacity of the various media for removing sewage odor was evaluated and compared. Results revealed that the odor concentration of the influent column air averaged 35 sou m-3. Of the four activated carbon grades tested, the alkali impregnated carbon that is frequently recommended for use at sewerage facilities was found to be least effective in the treatment of odors from the DAF unit. The capacity of the various media tested ranged from about 2650 sou kg-1 for the worst activated carbon grade to 37,510 sou kg-1 for the activated alumina which was the most effective adsorbent used. It is estimated that the cost for treating a given volume of odorous air at the DAF unit with activated alumina will be less than 65% of the most economic activated carbon grade.
Source Title: Water, Air, and Soil Pollution
ISSN: 00496979
Appears in Collections:Staff Publications

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