Effects of Thickened Excess Sludge Pre-Treatment Using Hydrodynamic Cavitation for Anaerobic Digestion

Agnieszka Garlicka , Monika Żubrowska-Sudoł , Katarzyna Umiejewska , Otton Roubinek , Jacek Palige , Andrzej Chmielewski

Abstract

The main purpose of this study was the assessment of the possibility of increasing the production of biogas through the pre-treatment of thickened excess sludge (TES) by means of the hydrodynamic cavitation (HC) conducted at different levels of energy density (EL) i.e., 70, 140 and 210 kJ/L. The experiments were performed on a pilot scale, and a mixture of thickened primary sludge (TPS) and TES was used as digester feed. The results documented that an important parameter determining the possibility of obtaining an enhanced methane production is the value of energy input in the HC process. This parameter determines the changes occurring in sludge as a result of disintegration (i.e., sludge floc deagglomeration, lysis of cells, re-flocculation process and the related release of compounds susceptible to biodegradation from sludge flocs). The maximum increase in methane yield (MY) of 152% was obtained for EL = 140 kJ/L. In this case, HC mainly caused sludge floc deagglomeration. An increase in MY was also recorded when TES was subject to the disintegration process at EL = 210 kJ/L. However, it was 4.3 times lower than that observed for EL = 140 kJ/L. Pre-treatment of TES at EL = 70 kJ/L did not contribute to an increase in methane production.
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
, Katarzyna Umiejewska (FEE / DWSWT)
Katarzyna Umiejewska,,
- Department of Water Supply and Wastewater Treatment
, Otton Roubinek - [Institute of Nuclear Chemistry and Technology, Warsaw]
Otton Roubinek,,
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, Jacek Palige - [Institute of Nuclear Chemistry and Technology, Warsaw]
Jacek Palige,,
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, Andrzej Chmielewski - [Institute of Nuclear Chemistry and Technology, Warsaw]
Andrzej Chmielewski,,
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Journal seriesEnergies, [ENERGIES], ISSN 1996-1073
Issue year2020
Vol13
No10
Pages1-15
Article number2483
Keywords in Englishanaerobic digestion, hydrodynamic cavitation, thickened excess sludge, methane yield, wastewater engineering
ASJC Classification1700 General Computer Science
DOIDOI:10.3390/en13102483
URL https://www.mdpi.com/1996-1073/13/10/2483
Languageen angielski
File
energies-13-02483-v2.pdf 1.71 MB
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 02-09-2020, ArticleFromJournal
Publication indicators WoS Citations = 0; Scopus Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.156; WoS Impact Factor: 2018 = 2.707 (2) - 2018=2.99 (5)
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