Biogas production from Jatropha curcas press-cake
- Graz Technical Univ. (Austria); and others
Seeds of the tropical plant Jatropha curcas (purge nut, physic nut) are used for the production of oil. Several methods for oil extraction have been developed. In all processes, about 50% of the weight of the seeds remain as a press cake containing mainly protein and carbohydrates. Investigations have shown that this residue contains toxic compounds and cannot be used as animal feed without further processing. Preliminary experiments have shown that the residue is a good substrate for biogas production. Biogas formation was studied using a semicontinous upflow anaerobic sludge blanket (UASB) reactor; a contact-process and an anaerobic filter each reactor having a total volume of 110 L. A maximum production rate of 3.5 m{sup 3} m{sup -3} d{sup -1} was obtained in the anaerobic filter with a loading rate of 13 kg COD m{sup -3} d{sup -1}. However, the UAS reactor and the contact-process were not suitable for using this substrate. When using an anaerobic filter with Jatropha curcas seed cake as a substrate, 76% of the COD was degraded and 1 kg degraded COD yielded 355 L of biogas containing 70% methane. 28 refs., 3 figs., 4 tabs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 576250
- Report Number(s):
- CONF-960539--
- Journal Information:
- Applied Biochemistry and Biotechnology, Journal Name: Applied Biochemistry and Biotechnology Vol. 63-65; ISSN ABIBDL; ISSN 0273-2289
- Country of Publication:
- United States
- Language:
- English
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