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Water 2015, 7(3), 855-867; doi:10.3390/w7030855

Influence of Temperature on the Performance of a Full-Scale Activated Sludge Process Operated at Varying Solids Retention Times Whilst Treating Municipal Sewage

1
Institute of Environmental Sciences and Engineering, School of Civil and Environmental Engineering, National University of Sciences and Technology, Islamabad 44000, Pakistan
2
Water Sustainability Research Centre, Department of Mechanical, Aerospace, and Civil Engineering, Brunel University London, Uxbridge, Middlesex UB8 3PH, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Say-Leong Ong
Received: 29 November 2014 / Revised: 22 January 2015 / Accepted: 12 February 2015 / Published: 2 March 2015
(This article belongs to the Special Issue Water Quality Control and Management)
View Full-Text   |   Download PDF [348 KB, uploaded 9 June 2015]   |  

Abstract

In this study, the solid retention time (SRT) was varied with the ambient temperature for a full-scale municipal activated sludge plant with capacity of 200,000 PE (Population Equivalent) located in a humid sub-tropical environment. The effects of ambient temperature on treatment performance were investigated. Off-line samples were collected and analyzed from the treatment plant. The actual temperature variation during the study period was divided into three overlapping ranges and the SRT was adjusted accordingly with temperature in order to achieve the desired effluent quality. The plant’s observed effluent quality and thereby its overall removal efficiency was evaluated in terms of measuring standard biochemical parameters. The results indicate that significant improvement in effluent quality can be obtained by applying the variable SRT (5–7 days) dependent on temperature variation. View Full-Text
Keywords: activated sludge process; performance evaluation; solids retention time; temperature variation activated sludge process; performance evaluation; solids retention time; temperature variation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Shahzad, M.; Khan, S.J.; Paul, P. Influence of Temperature on the Performance of a Full-Scale Activated Sludge Process Operated at Varying Solids Retention Times Whilst Treating Municipal Sewage. Water 2015, 7, 855-867.

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