Table of Contents
Activated Sludge - Evaluating & Controlling Your Process
by Tim Hobson
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Top of Page Intro Process Eval Process Control Troubleshooting
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This is not an introductory text about activated sludge. In this book, we discuss the observation, testing, and calculation procedures that provide data about the status of the activated sludge process. In addition, we discuss in depth how to apply this data to the business of controlling your activated sludge treatment process. Basic activated sludge concepts are addressed in this book in the context of process evaluation and control. We focus our efforts on discussing a basic, practical system of control for the process. The procedures discussed in this manual are equally applicable to all variations. An operator must have information about settleability, dissolved oxygen concentration, solids concentration, effluent quality, and clarifier sludge levels for consistent, efficient process performance of every type of activated sludge process. These procedures are covered in detail. The procedures discussed are based on work done by E. B. Mallory in the 1930’s and 40’s and further developed by Alfred W. West while he was head of the Operational Technology Branch of the Environmental Protection Agency in the 1960’s and 70’s. The system, with some modifications by this author, is frequently called the “West Method” or "Sludge Quality Method" of activated sludge process control because operational controls adjustments are based on the sludge quality existing in your facility rather than on arbitrary values. Activated Sludge Evaluating and Controlling Your Process Table of Contents Part I: Process Evaluation Chapter 1: Observation Chapter 2: Measuring sludge settleability Chapter 3: Measuring concentration and amount of solids
in the process Chapter 4: Aeration basin dissolved oxygen and oxygen
profiles Chapter 5: Determining effluent quality Chapter 6: Measuring secondary clarifier sludge blankets Chapter 7: Microscopic examination of activated sludge Chapter 8: Displaying evaluation results At each step, we discuss how you can apply these testing skills to find out more about the status of your process, and what steps to take to progress toward a balanced, highly efficient state of operation. In Part II, we discuss how to interpret and apply the observation and test results learned in Part I:
Part III In Part III, Troubleshooting Guides for the activated sludge process are presented. The guides originally were applicable to the conventional activated sludge process but have been modified here to include information for operators of the extended aeration process. |
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