The effects of mechanical sludge disintegration to enhance full-scale anaerobic digestion of municipal sludge

Monika Żubrowska-Sudoł , Jolanta Podedworna , Katarzyna Sytek-Szmeichel , Agnieszka Bisak , Piotr Krawczyk , Agnieszka Garlicka

Abstract

The main goal of the study was to evaluate the effects of mechanical sludge disintegration in enhancing full-scale anaerobic digestion of municipal sludge. Batch disintegration tests and lab dewatering tests were performed to determine the release of organic compounds and to assess the impact of disintegration of excess sludge before the fermentation process of mixed sludge on the dewaterability of post-fermented sludge, respectively. In the study, a disc disintegrator driven by a motor with a power of 30 kW, revolutions n = 2950 rpm, was used. It was shown that increased amounts of organic compounds were released from the sludge along with an increase in energy consumed in the disintegration. A part of the organic compounds were volatile fatty acids (VFAs). The highest share of VFAs in the released organic compounds (COD:VFA in the range of 6.6  ÷  8.2) was obtained by performing disintegration at an energy density of 140 kJ/L. It was also documented that the introduction of excess sludge disintegration prior to the fermentation tank resulted in a significant increase in biogas production (by an average of 33.9%) and in an increase in volatile total solids reduction in the fermented sludge (by an average of 22.7%). Such a surplus of produced biogas would allow to produce ca. 1600 kWh/d net electricity and 7.5 GJ/d (2080 kWh/d) of heat. Moreover, it was documented that the share of disintegrated waste activated sludge in the mixed sludge subjected to the fermentation process could favourably influence the efficiency of post-fermented sludge dewatering.
Author Monika Żubrowska-Sudoł ZZWOŚ
Monika Żubrowska-Sudoł,,
- Department of Water Supply and Wastewater Treatment
, Jolanta Podedworna ZZWOŚ
Jolanta Podedworna,,
- Department of Water Supply and Wastewater Treatment
, Katarzyna Sytek-Szmeichel ZZWOŚ
Katarzyna Sytek-Szmeichel,,
- Department of Water Supply and Wastewater Treatment
, Agnieszka Bisak WIBHiIŚ
Agnieszka Bisak,,
- Faculty of Building Services, Hydro and Environmental Engineering
, Piotr Krawczyk ITC
Piotr Krawczyk,,
- The Institute of Heat Engineering
, Agnieszka Garlicka ZZWOŚ
Agnieszka Garlicka,,
- Department of Water Supply and Wastewater Treatment
Journal seriesThermal Science and Engineering Progress, ISSN 2451-9049
Issue year2018
Vol5
Pages289-295
Publication size in sheets0.5
Keywords in EnglishAnaerobic digestion, Mechanical disintegration, Waste activated sludge, Biogas production
DOIDOI:10.1016/j.tsep.2017.11.009
Languageen angielski
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Score (nominal)5
ScoreMinisterial score = 0.0, 26-01-2018, ArticleFromJournal
Ministerial score (2013-2016) = 5.0, 26-01-2018, ArticleFromJournal - czasopismo zagraniczne spoza list
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