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Stable operation during pilot-scale anaerobic digestion of nutrient-supplemented maize/sugar beet silage.

Ivo Achu, Nges LU ; Björn, Annika and Björnsson, Lovisa LU (2012) In Bioresource Technology 118C. p.445-454
Abstract
Biogas production from maize/sugar beet silage was studied under mesophilic conditions in a continuous stirred tank reactor pilot-scale process. While energy crop mono-digestion is often performed with very long hydraulic retention times (HRTs), the present study demonstrated an efficient process operating with a 50-day HRT and a corrected total solids (TS(corr)) based organic loading rate of 3.4kg/m(3)d. The good performance was attributed to supplementation with both macro- and micronutrients and was evidenced by good methane yields (318m(3)/tonTS(corr)), which were comparable to laboratory maximum expected yields, plus low total volatile fatty acid concentrations (<0.8g/L). A viscoplastic and thixotropic digester fluid behaviour was... (More)
Biogas production from maize/sugar beet silage was studied under mesophilic conditions in a continuous stirred tank reactor pilot-scale process. While energy crop mono-digestion is often performed with very long hydraulic retention times (HRTs), the present study demonstrated an efficient process operating with a 50-day HRT and a corrected total solids (TS(corr)) based organic loading rate of 3.4kg/m(3)d. The good performance was attributed to supplementation with both macro- and micronutrients and was evidenced by good methane yields (318m(3)/tonTS(corr)), which were comparable to laboratory maximum expected yields, plus low total volatile fatty acid concentrations (<0.8g/L). A viscoplastic and thixotropic digester fluid behaviour was observed, and the viscosity problems common in crop mono-digestion were not seen in this study. The effluent also complied with Swedish certification standards for bio-fertilizer for farmland application. Nutrient addition thus rendered a stable biogas process, while the effluent was a good quality bio-fertilizer. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Biogas, Bio-fertilizer, Energy crops, Macronutrients, Micronutrients
in
Bioresource Technology
volume
118C
pages
445 - 454
publisher
Elsevier
external identifiers
  • wos:000307259600060
  • pmid:22717562
  • scopus:84862272601
ISSN
1873-2976
DOI
10.1016/j.biortech.2012.05.096
language
English
LU publication?
yes
id
527b0928-d446-40eb-bac9-1a907189f13a (old id 2859210)
date added to LUP
2012-07-06 14:42:11
date last changed
2017-11-19 03:45:57
@article{527b0928-d446-40eb-bac9-1a907189f13a,
  abstract     = {Biogas production from maize/sugar beet silage was studied under mesophilic conditions in a continuous stirred tank reactor pilot-scale process. While energy crop mono-digestion is often performed with very long hydraulic retention times (HRTs), the present study demonstrated an efficient process operating with a 50-day HRT and a corrected total solids (TS(corr)) based organic loading rate of 3.4kg/m(3)d. The good performance was attributed to supplementation with both macro- and micronutrients and was evidenced by good methane yields (318m(3)/tonTS(corr)), which were comparable to laboratory maximum expected yields, plus low total volatile fatty acid concentrations (&lt;0.8g/L). A viscoplastic and thixotropic digester fluid behaviour was observed, and the viscosity problems common in crop mono-digestion were not seen in this study. The effluent also complied with Swedish certification standards for bio-fertilizer for farmland application. Nutrient addition thus rendered a stable biogas process, while the effluent was a good quality bio-fertilizer.},
  author       = {Ivo Achu, Nges and Björn, Annika and Björnsson, Lovisa},
  issn         = {1873-2976},
  keyword      = {Biogas,Bio-fertilizer,Energy crops,Macronutrients,Micronutrients},
  language     = {eng},
  pages        = {445--454},
  publisher    = {Elsevier},
  series       = {Bioresource Technology},
  title        = {Stable operation during pilot-scale anaerobic digestion of nutrient-supplemented maize/sugar beet silage.},
  url          = {http://dx.doi.org/10.1016/j.biortech.2012.05.096},
  volume       = {118C},
  year         = {2012},
}