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Exploring strategies for seaweed hydrolysis: Effect on methane potential and heavy metal mobilisation

Nkemka, Valentine LU and Murto, Marika LU (2012) In Process Biochemistry 47(12). p.2523-2526
Abstract
Energy-rich methane can be harnessed from seaweed deposits by anaerobic digestion. However, the high heavy metal content in the seaweed and its digestates limits their use as fertilisers. Heavy metal contaminants from solid seaweed can be removed by, mobilisation into a liquid phase and subsequent metal ions adsorption. In this laboratory-scale study, pretreatment strategies for enhancing seaweed hydrolysis in relation to metal ions. mobilisation were evaluated. Methane potential batch tests were also performed on the resulting treatment leachates. The results show that about 86% of the soluble organic compounds were hydrolysed/solubilised in a leach bed reactor followed by alkaline/autoclave post-treatments. However, Zn ion mobilisation... (More)
Energy-rich methane can be harnessed from seaweed deposits by anaerobic digestion. However, the high heavy metal content in the seaweed and its digestates limits their use as fertilisers. Heavy metal contaminants from solid seaweed can be removed by, mobilisation into a liquid phase and subsequent metal ions adsorption. In this laboratory-scale study, pretreatment strategies for enhancing seaweed hydrolysis in relation to metal ions. mobilisation were evaluated. Methane potential batch tests were also performed on the resulting treatment leachates. The results show that about 86% of the soluble organic compounds were hydrolysed/solubilised in a leach bed reactor followed by alkaline/autoclave post-treatments. However, Zn ion mobilisation was only 54% from the combined treatments. A 2.8-fold higher methane yield was obtained when the seaweed hydrolysis leachate and the post-treatment leachate were co-digested, compared to raw seaweed. This study demonstrated the efficient utilisation of seaweed for biogas production, and the partial heavy metals mobilisation to enable the metal removal for improved fertiliser quality. (C) 2012 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Anaerobic digestion, COD, Co-digestion, Heavy metal, Leach bed reactor, Seaweed, Zinc
in
Process Biochemistry
volume
47
issue
12
pages
2523 - 2526
publisher
Elsevier
external identifiers
  • wos:000313851700109
  • scopus:84870788600
ISSN
1873-3298
DOI
10.1016/j.procbio.2012.06.022
language
English
LU publication?
yes
id
0a68c285-9801-483b-9fd6-2923d0e60d61 (old id 3576841)
date added to LUP
2013-03-25 12:12:08
date last changed
2017-10-01 03:25:33
@article{0a68c285-9801-483b-9fd6-2923d0e60d61,
  abstract     = {Energy-rich methane can be harnessed from seaweed deposits by anaerobic digestion. However, the high heavy metal content in the seaweed and its digestates limits their use as fertilisers. Heavy metal contaminants from solid seaweed can be removed by, mobilisation into a liquid phase and subsequent metal ions adsorption. In this laboratory-scale study, pretreatment strategies for enhancing seaweed hydrolysis in relation to metal ions. mobilisation were evaluated. Methane potential batch tests were also performed on the resulting treatment leachates. The results show that about 86% of the soluble organic compounds were hydrolysed/solubilised in a leach bed reactor followed by alkaline/autoclave post-treatments. However, Zn ion mobilisation was only 54% from the combined treatments. A 2.8-fold higher methane yield was obtained when the seaweed hydrolysis leachate and the post-treatment leachate were co-digested, compared to raw seaweed. This study demonstrated the efficient utilisation of seaweed for biogas production, and the partial heavy metals mobilisation to enable the metal removal for improved fertiliser quality. (C) 2012 Elsevier Ltd. All rights reserved.},
  author       = {Nkemka, Valentine and Murto, Marika},
  issn         = {1873-3298},
  keyword      = {Anaerobic digestion,COD,Co-digestion,Heavy metal,Leach bed reactor,Seaweed,Zinc},
  language     = {eng},
  number       = {12},
  pages        = {2523--2526},
  publisher    = {Elsevier},
  series       = {Process Biochemistry},
  title        = {Exploring strategies for seaweed hydrolysis: Effect on methane potential and heavy metal mobilisation},
  url          = {http://dx.doi.org/10.1016/j.procbio.2012.06.022},
  volume       = {47},
  year         = {2012},
}