This study was undertaken to evaluate the laboratory performance of the anaerobic fluidized bed digesting secondary biological sludge at 35° C with four hydraulic-retention times (HRTs): 1, 2.5, 5, and 10 days. In addition, the effects of both operating temperature (15° C, 25° C and 35° C) and the initial sludge solubilization on the digester performance were also examined. It was found that at 35° C, an adequate degree of sludge digestion was obtainable with an HRT of only 1-2 days if the influent biological sludge was presolubilized by treatment with 17.5 meq/L of sodium hydroxide. If no presolubilization was used, the necessary HRT was increased to 10 days. When the temperature was decreased to 25° C and the sludge was presolubilized, the required HRT was 2.5-3 days. However, as the temperature was further decreased to 15° C, the system was unable to achieve adequate digestion in as long as 10 days, even with presolubilization. It was also observed that the fluidized-bed system was able to accept abrupt increases of loading without a corresponding buildup of excessive organic acids. © ASCE.
J. Huang et al., "Sludge Digestion By Anaerobic Fluidized Beds. I: Lab Performance Data," Journal of Environmental Engineering (United States), vol. 115, no. 6, pp. 1139 - 1155, American Society of Civil Engineers, Jan 1989.
The definitive version is available at https://doi.org/10.1061/(ASCE)0733-9372(1989)115:6(1139)
Civil, Architectural and Environmental Engineering
International Standard Serial Number (ISSN)
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01 Jan 1989