For the stabilization of sludges, theoretical considerations were used to determine a multiple stage ‘Method of Procedure', in order to estimate the advantages and disadvantages of such a procedure. For the procedure, combinations of mesophilic digestion with preceding aerobic-thermophilic or aerobic-mesophilic preliminary treatment as well as anaerobic-thermophilic preliminary treatment, were carried out at a technical pilot scale, in order to quantify the expected advantages compared to one-stage mesophilic digestion. It appeared that, depending on the aim of the process, a two-stage or combined method would give clear advantages either in respect of minimized residence time and desired disinfection, or in respect of all costs for the process.
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N. J. Dichtl; Two Stage Sludge Stabilization. Water Sci Technol 1 July 1987; 19 (7): 1247–1250. doi: https://doi.org/10.2166/wst.1987.0024
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