The sludge processing train of a wastewater treatment includes gravity thickener, sludge conditioning, and centrifuge. The combined primary and secondary sludge is 500 m3/d at 1.2 percent solids (sp. gr. = 1.01), the solids capture efficiencies of the gravity thickener and the centrifuge are 85 and 90 %, respectively. The gravity thickened sludge contains 4% solids (sp.gr. = 1.03). Dry chemicals are added in the thickened sludge at a ratio of 4 % of the weight of dry solids. The sludge cake has 25 % solids (sp.gr. = 1.06). 1. Calculate the volume of sludge cake, m3/d.2. Calculate the concentration of TSS in the overflows (returned liquid flow) from the thickener and centrifuge (mg/L)

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Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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The sludge processing train of a wastewater treatment includes gravity thickener, sludge conditioning, and centrifuge. The combined primary and secondary sludge is 500 m³/d at 1.2 percent solids (sp. gr. = 1.01), the solids capture efficiencies of the gravity thickener and the centrifuge are 85 and 90 %, respectively. The gravity thickened sludge contains 4% solids (sp.gr. = 1.03). Dry chemicals are added in the thickened sludge at a ratio of 4 % of the weight of dry solids. The sludge cake has 25 % solids (sp.gr. = 1.06).

1. Calculate the volume of sludge cake, m³/d.

2. Calculate the concentration of TSS in the overflows (returned liquid flow) from the thickener and centrifuge (mg/L)

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