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)

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)

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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