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EFFECT OF RECYCLING THERMOPHILICALLY DIGESTED SLUDGE ON THE ACTIVATED SLUDGE PROCESS
Citation:
Prakasam, T., S. Soszynski, D. Zenz, C. Lue-Hing, L. Blyth, AND G. Sernel. EFFECT OF RECYCLING THERMOPHILICALLY DIGESTED SLUDGE ON THE ACTIVATED SLUDGE PROCESS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-90/037 (NTIS PB90258518), 1990.
Description:
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). n this process, sludge is withdrawn from a thermophilic digester operated in series with a mesophilic digester and partially recycled into the aeration tanks of the activated sludge system. he Hanover Park WRP, which has a design flow capacity of 45,420 million m3 per day (12 mgd), was split into a control section and an experimental section. he 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. eduction 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. his was a much smaller reduction than obtained by Torpey et al. ludge dewatering properties were not improved. he recycling produced no adverse effects on quality of the treated wastewater.
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EFFECT OF RECYCLING THERMOPHILICALLY DIGESTED SLUDGE ON THE ACTIVATED SLUDGE PROCESS