Journal
ENVIRONMENTAL TECHNOLOGY
Volume 36, Issue 11, Pages 1398-1404Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2014.991354
Keywords
dairy waste; calcium removal; nutrient recovery; microwave treatment; struvite crystallization
Categories
Funding
- Agriculture and Agri-Food Canada thorough the Advancing Canadian Agriculture and Agri-Food (ACAAF) programme
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Phosphorus was recovered from dairy manure via a microwave-enhanced advanced oxidation process (MW/H2O2-AOP) followed by struvite crystallization in a pilot-scale continuous flow operation. Soluble phosphorus in dairy manure increased by over 50% after the MW/H2O2-AOP, and the settleability of suspended solids was greatly improved. More than 50% of clear supernatant was obtained after microwave treatment, and the maximum volume of supernatant was obtained at a hydrogen peroxide dosage of 0.3% and pH 3.5. By adding oxalic acid into the supernatant, about 90% of calcium was removed, while more than 90% of magnesium was retained. As a result, the resulting solution was well suited for struvite crystallization. Nearly 95% of phosphorus in the treated supernatant was removed and recovered as struvite.
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