Design and Development of Operational Diagram for Controlling the Performance of Activated Sludge Process with a Case Study
Publication: Journal of Environmental Engineering
Volume 142, Issue 6
Abstract
This paper describes the design and development of an operational diagram that was developed based on the solids flux theory and connects the process operational parameters, namely, mixed-liquor suspended solids, flow, volume, area, and recycle ratio in an unified graphical form to facilitate the design and operation of secondary clarifiers for an Indian pulp and paper industry. A control strategy was developed based on steady-state control methods by utilizing the batch settling data generated in stationary phase complimented with artificial neural network models. These diagrams evaluate the operating strategies in response to changes in flow rate or settleability of solids. These operational diagrams developed based on steady-state control analysis, can be used for controlling the performance of the activated sludge process subjected to long term variations in the influent flowrate and substrate concentration. The plant operator can make a rational decision on his own to control the process using the operation diagrams.
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Acknowledgments
The authors are grateful to M/s.Seshasayee Paper and Boards Ltd., a south Indian based paper and pulp mill for their assistance in providing the sludge and wastewater sample. Experimental work was conducted in the Environmental Laboratory, PSNA College of Engineering and Technology, Dindigul, India. The authors thank Ms. Vidhya V. Iyer for proofreading and editing the manuscript.
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Published In
Journal of Environmental Engineering
Volume 142 • Issue 6 • June 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Aug 1, 2013
Accepted: Oct 1, 2015
Published online: Feb 4, 2016
Published in print: Jun 1, 2016
Discussion open until: Jul 4, 2016
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