The activated sludge process was developed from empirical knowledge and is now widely used for wastewater treatment. From a microbial point of view, i. Discuss how the ecology of different sectors of the process can be defined. ii. Design an experiment to understand how an efficient process differs from one with problems, such as sludge bulking.

The activated sludge process was developed from empirical knowledge and is now widely used for wastewater treatment. From a microbial point of view, i. Discuss how the ecology of different sectors of the process can be defined. ii. Design an experiment to understand how an efficient process differs from one with problems, such as sludge bulking.

Body Structures & Functions

12th Edition

ISBN:9781285695495

Author:Scott

Publisher:Scott

Chapter16: Infection Control And Standard Precautions

Section: Chapter Questions

Problem 6RQ

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2. 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. a. Will the oxygen requirement actually be reduced? b. Will the MLVSS increase, decrease or stay about the same? c. Will the sludge settling characteristics improve, stay about the same, or worsen? d. Will the effluent BOD concentration increase, decrease, or stay about the same? 3. Filamentous bacteria that cause sludge foaming in activated sludge treatment systems differ from the desirable floc-forming bacteria in several aspects of their metabolism. First, filamentous bacteria have different growth curves than floc-forming bacteria as shown in the figure below. Second, filamentous bacteria use only oxygen as an electron acceptor and cannot use nitrate for that function; floc-forming…
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