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wastewater solids, can improve the quality of the C Wastewater solids feed/conveyance <br /> product with respect to metals. mechanism. <br /> DESIGN CRITERIA C Lime storage (silo, 1000 or 50 pound bags, <br /> There are many factors that must be considered in etc.) <br /> designing an alkaline stabilization facility for C Lime transfer conveyor. <br /> biosolids. The most critical are: <br /> C Mixer. <br /> C Percent solids of infeed wastewater solids. <br /> C Air emission control equipment to minimize <br /> C Desired results (Class A versus Class B) odors and dust. <br /> which affect the amount of alkaline material <br /> needed and mixing time, which, in turn, Figure 2 presents a typical flow diagram for alkaline <br /> impacts equipment size. stabilization. A list of general design parameters <br /> C Source and volume of alkaline material to be and criterion for Class B alkaline stabilization is <br /> used. found in Table 1. <br /> C Odor control equipment at the processing Designing a facility to meet Class A stabilization <br /> facility. requirements may require additional lime storage to <br /> C Storage and curing areas. allow an increased lime dose, additional curing <br /> capacity, and/or the provision of supplemental heat. <br /> The equipment necessary for alkaline stabilization is <br /> relatively easy to install and operate. Typical <br /> equipment includes the following: <br /> 10 Treated Air Vented to Atmosphere <br /> Storage Silo <br /> Exhaust Air <br /> Treatment Process Air <br /> Alkaline <br /> Additive <br /> Supplemental Heat <br /> r Source or Alkaline <br /> Biosolids Mixing ��\ Mixing to Achieve <br /> Class A <br /> V <br /> r -- --- --- --, <br /> Product Curing ; Product <br /> �__and/Storage_ ; Distribution <br /> Source: Parsons Engineering Science, Inc., 1999. <br /> Note: Dashed lines indicate optional equipment. <br /> FIGURE 2 FLOW DIAGRAM OF A TYPICAL ALKALINE STABILIZATION OPERATION <br />