Journal
ENVIRONMENTAL TECHNOLOGY
Volume 40, Issue 23, Pages 3086-3093Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2018.1477839
Keywords
WAS disintegration; differential centrifugal sedimentation; disintegration degree; chemical oxygen demand; sludge particle size
Categories
Funding
- Ministry of Education, Youth and Sports [LO1201, LM2015073, CZ.1.05/2.1.00/19.0386]
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A novel method for assessing the disintegration degree (DD) of waste activated sludge (WAS) with the use of differential centrifugal sedimentation method (DCS) was shown herein. The method was validated for a WAS sample at four levels of disintegration in the range of 14.4-82.6% corresponding to the median particle size range of 8.5-1.6 mu m. From the several sludge disintegration methods used (i.e. microwave, alkalization, ultrasounds and peroxydisulfate activated by ultrasounds), the activated peroxydisulfate disintegration resulted in the greatest DD 83% and the smallest median particle size of WAS. Particle size distribution of pretreated sludge, measured by DCS, was in a negative correlation with the DD, determined from soluble chemical oxygen demand (SCOD; determination coefficient of 0.995). Based on the obtained results, it may be concluded that the DCS analysis can approximate the WAS disintegration degree.
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