Sewage Sludge Applications

The wet combustion process has been used in sewage sludge treatment since the early 1960s, and in this period, both continuous and batch plants were installed for either high-pressure or low-pressure operation. Table 7.50.4 describes the capabilities of this process based on data provided by the patentee. The tabulation assumes that the waste has 3.5% solids and a COD of 43 gm O2/l before oxidation. The table lists three levels of oxidation corre-

FIG. 7.50.8 Steam-to-air ratio at saturation in the reactor vapor space for various operating temperatures and pressures.

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