Anaerobic digestion of Jatropha curcas L. press cake and effects of an iron-additive

Schmidt, Thomas (2011) Anaerobic digestion of Jatropha curcas L. press cake and effects of an iron-additive. Waste Management and Research, 29 (11). pp. 1171-1176.

Abstract

Oil production from Jatropha curcas L. seeds generates large amounts of Jatropha press cake (JPC) which can be utilized as a substrate for biogas production. The objective of this work was to investigate anaerobic mono-digestion of JPC and the effects of an iron additive (IA) on gas quality and process stability during the increase of the organic loading rate (OLR). With the increase of the OLR from 1.3 to 3.2 gVS L−1 day−1, the biogas yield in the reference reactor (RR) without IA decreased from 512 to 194 LN kgVS−1 and the CH4 concentration decreased from 69.3 to 44.4%. In the iron additive reactor (IAR), the biogas yield decreased from 530 to 462 LN kgVS−1 and the CH4 concentration decreased from 69.4 to 61.1%. The H2S concentration in the biogas was reduced by addition of the IA to values below 258 ppm in the IAR while H2S concentration in the RR increased and exceeded the detection limit of 5000 ppm. The acid capacity (AC) in the RR increased to more than 20 g L−1, indicating an accumulation of organic acids caused by process instability. AC values in the IAR remained stable at values below 5 g L−1. The results demonstrate that JPC can be used as sole substrate for anaerobic digestion up to an OLR of 2.4 gVS l−1 day−1. The addition of IA has effectively decreased the H2S content in the biogas and has improved the stability of the anaerobic process and the biogas quality.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: No Faculty
Date Deposited: 06 Jun 2017 00:13
Last Modified: 06 Jun 2017 00:13
Uncontrolled Keywords: additive; anaerobic digestion; biogas; hydrogen sulphide; iron; Jatropha press cake; methane
Fields of Research : 09 Engineering > 0907 Environmental Engineering > 090799 Environmental Engineering not elsewhere classified
Identification Number or DOI: 10.1177/0734242X11425566
URI: http://eprints.usq.edu.au/id/eprint/32440

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