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Evaluation of Odor Characteristics of Heat-Dried Pellets

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Heat drying of wastewater solids from municipal wastewater treatment plants is becoming prevalent as biosolids management regulations become more restrictive, since it produces an exceptional quality (EQ) pellet product. The product from heat drying is sometimes odorous as dry pellets or as ‘wetted’ pellets. The odors, although not regulated, can be important for marketability and public acceptance of the product. The reasons for the odors are usually a result of upstream processing and management of wastewater solids prior to drying. The goals of the study were to determine the odor characteristics and to compare the odors produced from different types of heat dried pellets. This study evaluated the odors from four types of heat dried biosolids. These pellets included 1). All undigested, 2). Primary digested, waste activated sludge (WAS) undigested, 3). All digested, and 4). WAS lime stabilized. The results are described in the paper.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864701790902130

Publication date: January 1, 2001

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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