Record Display for the EPA National Library Catalog
RECORD NUMBER: 28 OF 74Main Title | Effect of recycling thermophilic sludge on the activated sludge process / | |||||||||||
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Author | Prakasam, T. B. S. ; Soszynski, S. ; Zenz, D. R. ; Lue-Hing, C. ; Blyth, L. | |||||||||||
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CORP Author | Metropolitan Water Reclamation District of Greater Chicago, IL.;Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab. | |||||||||||
Publisher | U.S. Environmental Protection Agency, Risk Reduction Engineering Laboratory, | |||||||||||
Year Published | 1990 | |||||||||||
Report Number | EPA/600/2-90/037; EPA-R-811925 | |||||||||||
Stock Number | PB90-258518 | |||||||||||
Subjects | Sewage sludge--Illinois ; Sewage sludge digestion | |||||||||||
Additional Subjects | Activated sludge process ; Sludge digestion ; Sewage treatment ; Thermophiles ; Aeration ; Oxidation ; High temperature tests ; Substitutes ; Dewatering ; Performance evaluation ; Waste recycling ; Biological treatment ; Biotechnology ; Mesophilic conditions | |||||||||||
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Collation | 278 pages : illustrations ; 28 cm | |||||||||||
Abstract | A full-scale investigation was undertaken at Chicago's Hanover Park Water Reclamation Plant (WRP) to study whether the net sludge production from the WRP could be reduced by implementing a scheme developed by W. Torpey et al. (1984). In this process, sludge is withdrawn from a thermophilic digester operated in series with a mesophilic digester and partially recycled into the aeration tanks of the activated sludge system. The Hanover Park WRP, which has a design flow capacity of 45,420 million cu m per day (12 mgd), was split into a control section and an experimental section. The two sections were operated similarly except the thermophilic drawoff was recycled into the aeration tanks of the experimental section from a digester system consisting of mesophilic and thermophilic digesters operated in series. A reduction in net sludge production of about 10 percent was achieved at 40 percent recycle of thermophilic sludge into the aeration tanks at the Hanover Park WRP. This was a much smaller reduction than obtained by Torpey et al. Sludge dewatering properties were not improved. The recycling produced no adverse effects on quality of the treated wastewater. |
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Notes | Caption title. "Sept. 1990." Includes bibliographical references (page 6). "EPA/600/2-90/037." Microfiche. |
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Contents Notes | EPA/600/2-90/037. |