Nutrient solubilization and its availability following anaerobic digestion

Mehta, Chirag M. and Batstone, Damien J. (2013) Nutrient solubilization and its availability following anaerobic digestion. Water Science and Technology, 67 4: 756-763. doi:10.2166/wst.2012.622

Author Mehta, Chirag M.
Batstone, Damien J.
Title Nutrient solubilization and its availability following anaerobic digestion
Journal name Water Science and Technology   Check publisher's open access policy
ISSN 0273-1223
Publication date 2013-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.2166/wst.2012.622
Open Access Status Not yet assessed
Volume 67
Issue 4
Start page 756
End page 763
Total pages 8
Place of publication London, United Kingdom
Publisher I W A Publishing
Language eng
Abstract This study aims to investigate solubilization of elements (P, N, K, Ca and Mg) during anaerobic digestion (AD) of solid agriculture waste. It is important to maintain particularly phosphorous in the aqueous phase to be able to subsequently recover it in a concentrated form via crystallization. Batch AD was carried out at a mesophilic condition (37 WC) and pH 7.0±0.2 on a variety of piggery and poultry solid waste streams. Less than 10% of the total P, Ca and Mg was in soluble form in the digestate. Most of the N and K remained soluble in the digestate. A bioavailability test (citric acid extraction) showed P, Ca and Mg in the digestate were totally available. Complete solubilization of P, Ca and Mg occurred below a threshold of pH 5.5. This indicates these nutrients were released during digestion, and then either bound to form inorganic compounds or adsorbed on solid surfaces in the digestate. These effects reduce the feasibility of post-digestion recovery of the nutrients via struvite crystallization. Strategies to improve nutrient solubilization and recovery during the AD include addition of complexing chemicals, operation at depressed pH, or otherwise modifying the operating conditions.
Keyword Anaerobic digestion
Nutrient binding
Nutrient recovery
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID UQ00046
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
Advanced Water Management Centre Publications
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