Evaluation of Sludge Odor Control Alternatives

by Jerry Y.C. Huang, (M.ASCE), Asst. Prof. of Environmental Engrg.; Univ. of Wisconsin-Milwaukee, Milwaukee, Wisc.,
Terry W. Schroepfer, Staff Engr.; EUTEK, Inc., Sacramento, Calif.,
George E. Wilson, (M.ASCE), Pres.; EUTEK, Inc., Sacramento, Calif.,

Serial Information: Journal of the Environmental Engineering Division, 1978, Vol. 104, Issue 6, Pg. 1135-1148

Document Type: Journal Paper


Odor control is an important consideration in evaluating the alternatives for wastewater solids sludge disposal. The unit process of air stripping and vacuum vaporization was evaluated for determining the effective means for controlling odors generated from digested sludge. It is found that vacuum vaporization is superior to air stripping, because of: (1)Effective surface odor emission rate reduction; (2)minimal recurrence of increased surface odor concentration; (3)greater energy efficiency in odor removal; and (4)lower offgas flow rate production. The off-gas odorant stream from vacuum vaporization can be satisfactorily controlled for acceptable odor emissions using activated carbon adsorption. The study also investigates the odor volatility of the digested sludge and finds that the odorant characteristics of digested sludge as measured by the volatility are highly variable, apparently related to the efficient biological breakdown of organic sulfides to inorganic sulfide prior to the odor stripping.

Subject Headings: Stripping (chemical) | Sludge | Odors | Overland flow | Emissions | Sulfides | Wastewater management | Solid mechanics

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