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High methane yields and stable operation during anaerobic digestion of nutrient-supplemented energy crop mixtures

Ivo Achu, Nges LU and Björnsson, Lovisa LU (2012) In Biomass & Bioenergy 47. p.62-70
Abstract
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... (More)
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. (Less)
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author
organization
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Contribution to journal
publication status
published
subject
keywords
Anaerobic digestion, Biogas, Energy crops, Macronutrients, Micronutrients
in
Biomass & Bioenergy
volume
47
pages
62 - 70
publisher
Elsevier
external identifiers
  • wos:000314075900008
  • scopus:84870704466
ISSN
1873-2909
DOI
10.1016/j.biombioe.2012.10.002
language
English
LU publication?
yes
id
b922146a-bda1-42bd-b6cf-45ee66012b6a (old id 3568099)
date added to LUP
2013-03-25 13:00:09
date last changed
2017-10-22 03:19:45
@article{b922146a-bda1-42bd-b6cf-45ee66012b6a,
  abstract     = {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.},
  author       = {Ivo Achu, Nges and Björnsson, Lovisa},
  issn         = {1873-2909},
  keyword      = {Anaerobic digestion,Biogas,Energy crops,Macronutrients,Micronutrients},
  language     = {eng},
  pages        = {62--70},
  publisher    = {Elsevier},
  series       = {Biomass & Bioenergy},
  title        = {High methane yields and stable operation during anaerobic digestion of nutrient-supplemented energy crop mixtures},
  url          = {http://dx.doi.org/10.1016/j.biombioe.2012.10.002},
  volume       = {47},
  year         = {2012},
}