title: Stabilisation of microalgae: Iodine mobilisation under aerobic and anaerobic conditions.
abstract: Mobilisation of iodine during microalgae stabilisation was investigated, with the view of assessing the potential of stabilised microalgae as an iodine-rich fertiliser. An iodine-rich waste microalgae (0.35 ± 0.05 mg I g(-1) VS(added)) was stabilised under aerobic and anaerobic conditions. Iodine mobilisation was linearly correlated with carbon emission, indicating iodine was in the form of organoiodine. Comparison between iodine and nitrogen mobilisation relative to carbon emission indicated that these elements were, at least in part, housed separately within the cells. After stabilisation, there were 0.22 ± 0.05 and 0.19 ± 0.01 mg g(-1) VS(added) iodine remaining in the solid in the aerobic and anaerobic processed material respectively, meaning 38 ± 5.0% (aerobic) and 50 ± 8.6% (anaerobic) of the iodine were mobilised, and consequently lost from the material. The iodine content of the stabilised material is comparable to the iodine content of some seaweed fertilisers, and potentially satisfies an efficient I-fertilisation dose.
authors.affiliation: School of Chemical Engineering, University of Queensland, Queensland, Australia.
authors.forename: Wei
authors.initials: W
authors.lastname: Han
authors.affiliation: School of Chemical Engineering, University of Queensland, Queensland, Australia; School of Civil Engineering, University of Queensland, Queensland, Australia.
authors.forename: William
authors.initials: W
authors.lastname: Clarke
authors.affiliation: School of Chemical Engineering, University of Queensland, Queensland, Australia. Electronic address: s.pratt@uq.edu.au.
authors.forename: Steven
authors.initials: S
authors.lastname: Pratt
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D019149:Bioreactors; D002244:Carbon / Q000737:chemistry; D007454:Iodides / Q000737:chemistry; D007455:Iodine / Q000737:chemistry*; D058086:Microalgae / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods
chemical_list: D007454:Iodides; D012722:Sewage; D002244:Carbon; D007455:Iodine; D009584:Nitrogen
keywords: Aerobic digestion; Algal fertiliser; Anaerobic digestion; Iodine biofortification; Iodine mobilisation