Answered: One of the products of sewage treatment…

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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Question

One of the products of sewage treatment is sludge. After microorganisms grow in the sludge and remove nutrients and organic material, the resulting wet sludge is dewatered – making it dried sludge. To dispose of the dried sludge, it can be used as fertilizer or burned. To burn dried sludge, fuel oil (containing only carbon and hydrogen) is mixed with the dried sludge and the mixture is burned in a furnace with air. The table below gives analysis for the dry sludge and the furnace product gas. As you can see from the product gas list, all the fuel is burned.

Determine the wt% of carbon and hydrogen in the fuel oil.
Calculate the ratio of lbs of dry sludge to lbs of fuel oil in the mixture fed to the furnace.

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