ABSTRACT
T HE purpose of biosolids stabilization is to reduce volume, stabilize the organic matter, and eliminate pathogenic organisms to permit reuse or disposal. The equipment required for stabilization depends on the specific process used. Biosolids stabilization processes include the following:
aerobic digestion anaerobic digestion (see Figure 15.1) composting lime stabilization wet air oxidation (heat treatment) chemical oxidation (chlorine oxidation) incineration
The function of aerobic digestion is to stabilize waste solids by long-term aeration, thereby reducing the BOD and destroying volatile solids. Aerobic digestion is accomplished in one or more tanks (digester) that are similar in design to the aeration tank used for the activated sludge process (see Figure 15.2). Either diffused or mechanical aeration equipment is necessary to maintain the aerobic conditions in the tank. Solids and supematant removal equipment is also required.
