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THE EFFECT OF IN-PLANT RECYCLES ON CONTROL OF AN ACTIVATED SLUDGE PROCESS

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Abstract:

The concept of “sludge age” or solids retention time (SRT) is a useful tool for control of the activated sludge process. SRT provides a method of controlling the microbe population mix in the treatment process. The SRT history also provides important design information. However, calculating the SRT using only the amount of sludge pumped by the waste sludge pumps, often ignores the quantities of activated sludge recycled from downstream separation processes. As shown by operating data from a case study, these quantities can be substantial. Correcting the SRT calculation, accounting for in-plant recycle streams, improves the reliability of this important guideline for operating the activated sludge process.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864700784545027

Publication date: January 1, 2000

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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