Development of image analysis techniques as a tool to detect and quantify morphological changes in anaerobic sludge: II. Application to a granule deterioration process triggered by contact with oleic acid

Biotechnology and Bioengineering
A L AmaralM Madalena Alves

Abstract

Image analysis techniques are applied to monitor the morphological changes in granular sludge present in an expanded granular sludge blanket (EGSB) reactor fed with oleic acid. Deterioration of granular sludge was monitored along the trial period by measuring the percentage of aggregates smaller than 1 mm (in terms of Feret diameter) either in terms of projected area or in terms of number of aggregates. A good correlation was obtained between these values and the percentage of aggregates smaller than 1 mm were physically sorted and quantified by the volatile suspended solid content. The ratio of total filaments length to cross-sectional area of aggregates defined as LfA, was applied to quantify the dispersion level of the granular sludge, which increased until day 141 and remained almost invariant afterwards. LfA was sensitive to the sludge deterioration process and was able to indicate, with the anticipation of about 1 month, the most significant biomass washout episode that occurred in the trial period. A mechanism of filaments' release, detachment and selective washout was proposed to explain the action of LfA from this viewpoint. The equivalent diameter of the bottom aggregates larger than 1 mm increased with the increase o...Continue Reading

References

Oct 1, 1995·Applied and Environmental Microbiology·D DaffonchioW Verstraete
Jul 1, 1993·Biotechnology and Bioengineering·B T DudleyF M Wallis

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Citations

May 30, 2013·Environmental Science and Pollution Research International·J C CostaE C Ferreira
Dec 31, 2011·Bioresource Technology·Manel Garrido BaserbaDimitar Karakashev
Apr 8, 2011·Bioresource Technology·Wen-Wei Li, Han-Qing Yu
Sep 4, 2010·Bioresource Technology·Jingxing MaMarta Carballa
Nov 3, 2010·Journal of Hazardous Materials·D PuyolJ J Rodriguez
Aug 20, 2011·Critical Reviews in Biotechnology·Wilson Parawira

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