Note that in example 6.14, a settling tank is used to remove suspended solids from wastewater. The rate of flow of wastewater into the tank is 10L / s , and the influent concentration of SS is 200mg / L . The removal efficiency of the settling tank for SS is (60%. The calculated amount of SS (sludge) accumulating in the sludge zone each day is 103.68 kg/day. The sludge removed from the sludge zone of the settling tank in Example 6.14 has a solidsconcentration of 3%. To be able to burn the sludge in an incinerator, it must be dewatered.This is to be carried out by a gravity thickener which can achieve an underflow concentra-tion of 8%, and then the sludge will be concentrated further in a vacuum filter that will re-move 75% of the water from the feed stream. The density of wet sludge is approximatelyequal to that of water. Calculate (a) the flowrate of thickened sludge that must be handledby the vacuum filter, and (b) the composition of the filter cake produced by the vacuum fil-ter.

The solid amount will be constant as the filter and thickener units only remove the water amount.…

Answered: The sludge removed from the sludge zone…

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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Note that in example 6.14, a settling tank is used to remove suspended solids from wastewater. The rate of flow of wastewater into the tank is 10L / s , and the influent concentration of SS is 200mg / L . The removal efficiency of the settling tank for SS is (60%. The calculated amount of SS (sludge) accumulating in the sludge zone each day is 103.68 kg/day