Impact of rheological properties of substrate on anaerobic digestion and digestate dewaterability: New insights through rheological and physico-chemical

Miryahyaei, S, Olinga, K, Abdul Muthalib, F, Das, T, Ab Aziz, M, Othman, M, Baudez, J, Batstone, D and Eshtiaghi, N 2019, 'Impact of rheological properties of substrate on anaerobic digestion and digestate dewaterability: New insights through rheological and physico-chemical', Water Research, vol. 150, pp. 56-67.


Document type: Journal Article
Collection: Journal Articles

Title Impact of rheological properties of substrate on anaerobic digestion and digestate dewaterability: New insights through rheological and physico-chemical
Author(s) Miryahyaei, S
Olinga, K
Abdul Muthalib, F
Das, T
Ab Aziz, M
Othman, M
Baudez, J
Batstone, D
Eshtiaghi, N
Year 2019
Journal name Water Research
Volume number 150
Start page 56
End page 67
Total pages 12
Publisher I W A Publishing
Abstract Mesophilic batch anaerobic digesters fed by different substrates were set up to identify the role of substrate rheology in anaerobic digestion performance while operating below the toxic level. Five substrates of different rheological behaviour but at the same amount of organic matters were prepared by addition of different amount of an inert material (0, 0.03, 0.07, 0.11, and 0.20 g) per g of waste activated sludge (WAS). To gain a comprehensive insight, the interactive relationship between substrate rheology, physico-chemical properties and biogas production as well as digestate dewaterability was investigated. The results proved that better access of microorganisms to organic matters improved the digester performance and led to 19.29% and 12.5% increase in biogas yield and VS removal efficiency, respectively. Moreover, the statistical analysis showed that consistency index and loss modulus of sludge could be employed as promising indications for biogas yield while yield stress could predict dewaterability of digestate as far as the other physico-chemical properties remained unchanged. During digestion measurement of consistency index and loss modulus of digestate could be performed as a reliable tool to monitor biogas production.
Subject Wastewater Treatment Processes
Rheology
Keyword(s) Anaerobic digestion
Biogas production
Dewaterability
Substrate rheology
Physico-chemical properties
DOI - identifier 10.1016/j.watres.2018.11.049
Copyright notice © 2018 Elsevier Ltd. All rights reserved.
ISSN 0043-1354
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