QUANTITATIVE DETERMINATION OF THE STRENGTH OF ACTIVATED SLUDGE FLOCKS IN BIOLOGICAL TREATMENT TECHNOLOGIES-Reference-Cited by-同舟云学术

QUANTITATIVE DETERMINATION OF THE STRENGTH OF ACTIVATED SLUDGE FLOCKS IN BIOLOGICAL TREATMENT TECHNOLOGIES

Published:2023-12-05 Issue:109 Volume:1 Page:55-60
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Container-title:Scientific Bulletin of Building
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Author:

Iurchenko V.¹^ORCID,Tkachenko S.¹^ORCID

Affiliation:

1. O. M. Beketov National University of Urban Economy in Kharkiv

Abstract

The performance of sludge and the effectiveness of wastewater treatment in various biological treatment facilities are influenced by the morphological features of activated sludge flocs. Currently, these features are assessed qualitatively through visual inspection, without statistical processing of the data. The article presents the results of quantitative determination of the strength of activated sludge flocs. A computerized method has been created to quantify the morphological characteristics of activated sludge flocs by analyzing sludge micrographs using the ImageJ software. Color and contrast indices were used to quantify the strength of the flocs. Photographs of activated sludge from the work of D. Eikelboom were used as standards for determining strength. In the calculations, we used photographs by D. Eikelboom taken at a magnification of 300 times (100 pixels) and 150 times (50 pixels). A laboratory study of the effect of Mg ions on the properties of activated sludge flocs was carried out when controlling the morphology of the flakes using the developed computerized technique. Examining the impact of Mg ions on activated sludge flocs revealed that higher magnesium concentrations in the sludge liquid result in increased linear dimensions (by 59%), floc area (by 81%) and floc volume (by 275%), but concurrently lead to a decrease in the strength of activated sludge flakes (by 21%). The obtained results in general indicated the positive effect of magnesium ion on the sedimentation properties of sludge in the aerotank-settlement system. A scale for quantitative determination of the strength of activated sludge flocs has been constructed. The developed computerized method enhances the precision and detail of visual evaluations of the technological attributes of activated sludge flocs, enabling the detection of even the smallest changes in the morphological characteristics across different wastewater treatment technologies. Keywords: activated sludge, flocs, concentration of magnesium, strength, technological characteristics.

Publisher

O.M.Beketov National University of Urban Economy in Kharkiv

Subject

General Medicine,General Earth and Planetary Sciences,General Environmental Science,General Medicine,Ocean Engineering,General Medicine,General Medicine,General Medicine,General Medicine,General Earth and Planetary Sciences,General Environmental Science,General Medicine

Reference11 articles.

1. Eikelboom D. H. Process control of activated sludge plants by microscopic investigation. London : IWA Pub., 2000. 156 p.

2. M. Henze, P. Harremoës, Jansen J. La Cour & E. Arvin, editors. Wastewater treatment. biological; and chemical processes. 2nd edition.383p. Berlin: springer-verlag, 1997. price £52–50. Journal of the marine biological association of the United Kingdom. 1997. Vol. 77, no. 4. P. 1266. URL: https://doi.org/10.1017/s0025315400038911 (date of access: 06.12.2023).

3. Monitoring activated sludge settling properties using image analysis / R. Jenné et al. Water science and technology. 2004. Vol. 50, no. 7. P. 281–285. URL: https://doi.org/10.2166/wst.2004.0471 (date of access: 06.12.2023).

4. Mikkelsen L. The shear sensitivity of activated sludge: an evaluation of the possibility for a standardised floc strength test. Water research. 2002. Vol. 36, no. 12. P. 2931–2940. URL: https://doi.org/10.1016/s0043-1354(01)00518-8 (date of access: 06.12.2023).

5. Microscopic image analysis versus sludge volume index to monitor activated sludge bioflocculation: a case study / J. Van Dierdonck et al. Separation science and technology. 2013. Vol. 48, no. 10. P. 1433–1441. URL: https://doi.org/10.1080/01496395.2013.767836 (date of access: 06.12.2023).