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Capillary Suction Time (CST) measures the travel time for a given distance on a chromatography paper by the liquid drained from a sludge sample. It provides a laboratory assessment on dewaterability of the sludge. High CST suggests it would be difficult to remove the liquid from the sludge. The objectives of this research were to establish a quantitative relationship between the CST and solids concentrations. Experimental samples included undigested sludge, mesophilic aerobically digested sludge, and thermophilic aerobically digested sludge, all from wastewater treatment plants. Sludge dilution used the supernatant liquid from centrifuged sludge samples. The research found that, for each of the tested sludge samples, a strong linear correlation existed between the measured CST and the solids concentration (R2 ranged from 0.80 to 0.96). However, the coefficients (slopes and intercepts) of the correlation were sample-specific. Findings from this research suggested that, although a linear correlation exists between CST and solids concentrations, the coefficients to correct for the effect of solids concentration should be developed for each type of sludge that has unique characteristics.
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Document Type: Research Article

Publication date: 01 January 2004

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