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Heavy Metal Release by Chlorine Oxidation of Sludges

John W. Olver, William C. Kreye and Paul H. King
Journal (Water Pollution Control Federation)
Vol. 47, No. 10 (Oct., 1975), pp. 2490-2497
Stable URL: http://www.jstor.org/stable/25038392
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Heavy Metal Release by Chlorine Oxidation of Sludges
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Abstract

Chlorine oxidation has recently become a viable alternative for stabilization of certain types of wastewater sludge. Chlorine oxidation consists of application in a closed reaction vessel to oxidize the sludge and reduce its pH. Research was conducted to determine to what extent the supernatant from the process could ultimately cause recycle of heavy metals within a treatment plant. Primary, secondary, and combined sludges from essentially domestic systems as well as heavily industrial systems were studied. Results indicated that all of the metals studied were released. Percentage releases varied from 2 to 100 percent. The concentration of total heavy metals present in the supernatant ranged between 5 and 100 mg/l. The buffering capacity and final pH of the sludge were key parameters in heavy metal release. Possible solutions to the problem include pH adjustment and optimization of chlorine feed.

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