Design three solids handling unit processes: (a) an anaerobic digester to treat a plant's primary sludge, (b) a thickener to increase the solids concentration in a plant's secondary sludge (activated sludge), and then (c) an aerobic digester to stabilize these secondary solids. The plant has an average day flow of 120mgd. 1. Anaerobic Digester - Assume a sludge temperature of 60° with 72% volatile matter in the settled solids and a digester solids retention time (SRT) of 17 days. You have decided to provide 8 cylindrical, anaerobic digesters. a. Calculate the mass of sludge wasted (lb/day) that each digester will have to stabilize if the TSS removed by the primary clarifier is 150 mg/l, producing sludge with 95% water content. (Ans: 375,621 lb/day) b. If the specific gravity of the fixed solids is 2.60 and the specific gravity of the volatile solids is 1.30, calculate the specific gravity (Ss) of the TSS in the primary treatment and then the specific gravity (Ss¹) of the sludge (Eq. 14-1, p.1456(ed4) or Eq. 13-1, p.1459(ed5)) (Ss = 1.51 & Ssl = 1.02)

Q: Part C is the only one I need worked out.  Thanks!

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Integrated Solid Waste Management

Integrated Solid Waste Management (ISWM) is a thorough waste suppression, compost, removal and recycling Program. An effective ISWM system considers how to suppress, manage and recycle solid waste in a manner that is most efficiently to protect human health and the surrounding. ISWM system requires evaluation of public wants and demands and then selecting and merging the most effective waste management activities for the proposed demands. The main ISWM activities for solid waste management are Waste prevention, Recycling and Composting, and Combustion and Removal and waste collection in a properly planned, constructed, managed and mitigated landfill areas. Each of these requires careful designing, financing, accumulation, and delivery of activities.