Effect of hydrodynamic disintegration on the solubilisation and bioavailability of thickened excess sludge

Agnieszka Garlicka , Monika Żubrowska-Sudoł

Abstract

The main objective of the study was the verification whether conducting the hydrodynamic disintegration (HD) of thickened excess sludge (TES) before the anaerobic hydrolysis (AH) can cause an increase in the efficiency of the hydrolysis process, and therefore a reduction in its duration, or allow for complete omission of the stage before the anaerobic digestion (AD). For this purpose, the HD (conducted in five levels of energy density (EL): 140, 280, 420, 560 and 700 kJ/L) of TES was carried out, and then all sludges (before and after disintegration) were subjected to the AH. The obtained results confirmed that the process of HD can be an effective method of increasing the solubilisation and bioavailability of TES. In the process of HD, the maximum increase in ΔVFA (308–428 mg VFA/L), was reported when EL was increased from 140 to 280 kJ/L (the solubilisation degree increased from approximately 2 to 8%). The obtained results also showed that the ΔSTN and ΔSTP were related to solubilisation degree. The most intensive increase in the ΔSTN was determined for solubilisation degree in a range of 15–20%. In the case of ΔSTP, constant intensity of release of the compounds to the sludge liquid was observed. The obtained results also confirmed that conducting the process of AH of disintegrated TES proved to change the SCOD value when contrasted with the value of this indicator at the start of the experiment (before hydrolysis): (i) the EL equal to 140 and 280 kJ/L allowed for a higher SCOD value; (ii) at EL higher or equal to 560 kJ/L it caused a decrease in the SCOD value.
Author Agnieszka Garlicka (FEE / DWSWT)
Agnieszka Garlicka,,
- Department of Water Supply and Wastewater Treatment
, Monika Żubrowska-Sudoł (FEE / DWSWT)
Monika Żubrowska-Sudoł,,
- Department of Water Supply and Wastewater Treatment
Journal seriesUltrasonics Sonochemistry, ISSN 1350-4177, e-ISSN 1873-2828
Issue year2020
Vol64
Pages1-10
Publication size in sheets0.5
Article number105015
Keywords in EnglishBioavailability, COD solubilisation, Hydrolysis, Hydrodynamic disintegration, Thickened excess sludge, Wastewater engineering
ASJC Classification2741 Radiology Nuclear Medicine and imaging; 1501 Chemical Engineering (miscellaneous); 3102 Acoustics and Ultrasonics
DOIDOI:10.1016/j.ultsonch.2020.105015
URL https://www.sciencedirect.com/science/article/pii/S135041771930389X?via%3Dihub
Languageen angielski
File
1-s2.0-S135041771930389X-main.pdf 582.87 KB
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 02-09-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 1.766; WoS Impact Factor: 2018 = 7.279 (2) - 2018=6.227 (5)
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