The operations staff at a sewage treatment plant has decided to reduce the SRT of their activated sludge process from 6 days to 3 days by increasing the recycle rate. The goal is to reduce the oxygen requirement. You have been called in as an expert to give a qualitative assessment of this plan. Will the oxygen requirement actually be reduced? Will the MLVSS increase, decrease or stay about the same? Will the sludge settling characteristics improve, stay about the same, or worsen? Will the effluent BOD concentration increase, decrease, or stay about the same?

The operations staff at a sewage treatment plant has decided to reduce the SRT of their activated sludge process from 6 days to 3 days by increasing the recycle rate. The goal is to reduce the oxygen requirement. You have been called in as an expert to give a qualitative assessment of this plan. Will the oxygen requirement actually be reduced? Will the MLVSS increase, decrease or stay about the same? Will the sludge settling characteristics improve, stay about the same, or worsen? Will the effluent BOD concentration increase, decrease, or stay about the same?

Solid Waste Engineering

3rd Edition

ISBN:9781305635203

Author:Worrell, William A.

Publisher:Worrell, William A.

Chapter2: Municipal Solid Waste Characteristics And Quantities

Section: Chapter Questions

Problem 2.15P

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