Authors: Bye, Christopher M.; Dold, Peter L.

Source: Water Environment Research, Volume 70, Number 1, January/February 1998 , pp. 87-93(7)

Publisher: Water Environment Federation

Abstract:

Sludge volume index (SVI) type activated-sludge settleability measures are used in the design and control of secondary settling tanks. Considerable confusion exists as to the best parameter and experimental technique to use. The common settleability measures (SVI, diluted sludge volume index, stirred specific volume index [SSVI], and SSVI at 3.5 g/L) are outlined. This discussion is used as the basis for commenting on the validity of these measures and their relation to zone settling velocity measurements. A simple mechanistic model is used to evaluate the effects of solids characteristics and test parameters on SVI-type indices. Solids settleability and compactability, settling column height, and solids concentration in the test have an interactive effect on the measured SVI. The applied model explains many of the artifacts associated with SVI and questions the validity of correlations for zone settling parameters based on SVI-type measurements.

Keywords: ACTIVATED SLUDGE; SETTLEABILITY; FLUX THEORY; ZONE SETTLING VELOCITY; SLUDGE VOLUME INDEX; DILUTED SLUDGE VOLUME INDEX; STIRRED SPECIFIC VOLUME INDEX

Document Type: Research article

DOI: http://dx.doi.org/10.2175/106143098X126928

Publication date: 1998-01-01

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• Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.
  
  Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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