Abstract
In this preliminary study, the over-all ionic activity and pH in the supernatant of the sludge were measured after successive sludge washing with a range of aqueous buffers. As expected, considerable and varying degrees of ionic activity were observed at different pH values. Samples of effluent and effluent plus sludge at different points throughout the aerobic-treatment process in an industrial plant were collected. Conductivity and pH measurements were recorded on the samples, and possible reasons for variations in both parameters are discussed. A cost-effective method of heavy-metal removal from the sludge prior to disposal is considered.
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