High methane yields and stable operation during anaerobic digestion of nutrient-supplemented energy crop mixtures
Författare
Summary, in English
The feasibility of digesting energy crops supplemented with macro- and micronutrients instead of manure, without the commonly applied long hydraulic retention time (HRT), was investigated in long-term, single-stage continuous stirred tank processes. The crops used were mixtures of sugar beets, maize and whole crop triticale. The organic loading rate (OLR) measured as a total solid (TS) was 1.5-5.5 kg m(-3) d(-1) and the HRT from 30 to 40 days. The results showed high methane yields, comparable to those in batch digestion, and high stability. The digestion of beets only was most stable, and showed the highest average TS-based methane yield (383 +/- 26 m(3) kg(-1)) at an OLR of 4.5 kg m(-3) d(-1) and a HRT of 40 days. No significant difference in methane yield was found for all the crop mixtures during stable operation. Nutrient addition therefore showed the same stimulatory and stabilising effects as manure with high methane yields achieved at relatively short HRTs. (c) 2012 Elsevier Ltd. All rights reserved.
Avdelning/ar
Publiceringsår
2012
Språk
Engelska
Sidor
62-70
Publikation/Tidskrift/Serie
Biomass & Bioenergy
Volym
47
Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Industrial Biotechnology
Nyckelord
- Anaerobic digestion
- Biogas
- Energy crops
- Macronutrients
- Micronutrients
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1873-2909