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Digestate liquor recycle in minimal nutrients-supplemented anaerobic digestion of wheat straw

Ivo Achu, Nges LU ; Wang, Bing LU ; Cui, Zhifang and Liu, Jing LU (2015) In Biochemical Engineering Journal 94. p.106-114
Abstract
Anaerobic digestion (AD) of minimal nutrient-supplemented wheat straw and digestate liquor recycle was evaluated in semi-continuous processes using a novel BioReactor Simulator developed for easy accurate online normalised-gas measurement. Three scenarios (i) no recycle (NR), (ii) recycle of soluble nutrient (RSN), and (iii) recycle of nutrient and microbes (RNM) were investigated in order to evaluate their respective efficiencies. Although mono-digestion of lignocellulosic biomasses are often performed with very long solid retention times (SRT), the present study demonstrated an efficient process operating with a 30-day SRT and an organic loading rate of 4 gVS/L d. The best methane yield was 303 mLCH(4)/g VS achieved in the RSN process... (More)
Anaerobic digestion (AD) of minimal nutrient-supplemented wheat straw and digestate liquor recycle was evaluated in semi-continuous processes using a novel BioReactor Simulator developed for easy accurate online normalised-gas measurement. Three scenarios (i) no recycle (NR), (ii) recycle of soluble nutrient (RSN), and (iii) recycle of nutrient and microbes (RNM) were investigated in order to evaluate their respective efficiencies. Although mono-digestion of lignocellulosic biomasses are often performed with very long solid retention times (SRT), the present study demonstrated an efficient process operating with a 30-day SRT and an organic loading rate of 4 gVS/L d. The best methane yield was 303 mLCH(4)/g VS achieved in the RSN process showing a 21% improvement as compared to the NR process. The methanogenic potential of the digestates from the RSN and RNM processes was comparable to fresh inoculum indicating efficient processes. The RNM and RSN processes showed superior process stability evidenced by minimal volatile fatty acid accumulation (<0.5 g/L). As compared to the RNM process, RSN demonstrated the best performance. The improved process performance was probably due to higher nutrient and microbial concentration in the digestate-recycled processes. This study confirms the feasibility of digestate recycle in AD as an appropriate technology for treating nutrient-deficient substrates. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Anaerobic digestion, Bioreactor Simulator, Digestate recycle, Macronutrients micronutrients, Wheat straw, Sewage sludge
in
Biochemical Engineering Journal
volume
94
pages
106 - 114
publisher
The Association for the Study of Animal Behaviour / Elsevier B.V.
external identifiers
  • wos:000348884500015
  • scopus:84916918620
ISSN
1369-703X
DOI
10.1016/j.bej.2014.11.023
language
English
LU publication?
yes
id
4fe69624-7ac0-4dfc-98c0-169b5eacc624 (old id 5186086)
date added to LUP
2015-03-30 14:18:39
date last changed
2017-01-01 06:03:33
@article{4fe69624-7ac0-4dfc-98c0-169b5eacc624,
  abstract     = {Anaerobic digestion (AD) of minimal nutrient-supplemented wheat straw and digestate liquor recycle was evaluated in semi-continuous processes using a novel BioReactor Simulator developed for easy accurate online normalised-gas measurement. Three scenarios (i) no recycle (NR), (ii) recycle of soluble nutrient (RSN), and (iii) recycle of nutrient and microbes (RNM) were investigated in order to evaluate their respective efficiencies. Although mono-digestion of lignocellulosic biomasses are often performed with very long solid retention times (SRT), the present study demonstrated an efficient process operating with a 30-day SRT and an organic loading rate of 4 gVS/L d. The best methane yield was 303 mLCH(4)/g VS achieved in the RSN process showing a 21% improvement as compared to the NR process. The methanogenic potential of the digestates from the RSN and RNM processes was comparable to fresh inoculum indicating efficient processes. The RNM and RSN processes showed superior process stability evidenced by minimal volatile fatty acid accumulation (&lt;0.5 g/L). As compared to the RNM process, RSN demonstrated the best performance. The improved process performance was probably due to higher nutrient and microbial concentration in the digestate-recycled processes. This study confirms the feasibility of digestate recycle in AD as an appropriate technology for treating nutrient-deficient substrates.},
  author       = {Ivo Achu, Nges and Wang, Bing and Cui, Zhifang and Liu, Jing},
  issn         = {1369-703X},
  keyword      = {Anaerobic digestion,Bioreactor Simulator,Digestate recycle,Macronutrients micronutrients,Wheat straw,Sewage sludge},
  language     = {eng},
  pages        = {106--114},
  publisher    = {The Association for the Study of Animal Behaviour / Elsevier B.V.},
  series       = {Biochemical Engineering Journal},
  title        = {Digestate liquor recycle in minimal nutrients-supplemented anaerobic digestion of wheat straw},
  url          = {http://dx.doi.org/10.1016/j.bej.2014.11.023},
  volume       = {94},
  year         = {2015},
}