title: Recovery of phosphorus from dairy manure: a pilot-scale study.
abstract: 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.
authors.affiliation: a Department of Civil Engineering , University of British Columbia , 6250 Applied Science Lane, Vancouver , British Columbia , Canada.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.forename: Victor K
authors.initials: VK
authors.lastname: Lo
authors.forename: James R
authors.initials: JR
authors.lastname: Thompson
authors.forename: Frederic A
authors.initials: FA
authors.lastname: Koch
authors.forename: Ping H
authors.initials: PH
authors.lastname: Liao
authors.forename: Sergey
authors.initials: S
authors.lastname: Lobanov
authors.forename: Donald S
authors.initials: DS
authors.lastname: Mavinic
authors.forename: James W
authors.initials: JW
authors.lastname: Atwater
mesh_terms: D002118:Calcium / Q000302:isolation & purification; D003612:Dairying; D006861:Hydrogen Peroxide / Q000737:chemistry; D017616:Magnesium Compounds / Q000737:chemistry; D008372:Manure; D008872:Microwaves; D010084:Oxidation-Reduction; D010710:Phosphates / Q000737:chemistry; D010758:Phosphorus / Q000302:isolation & purification*; D010865:Pilot Projects; D000069877:Struvite
chemical_list: D017616:Magnesium Compounds; D008372:Manure; D010710:Phosphates; D010758:Phosphorus; D000069877:Struvite; D006861:Hydrogen Peroxide; D002118:Calcium
keywords: calcium removal; dairy waste; microwave treatment; nutrient recovery; struvite crystallization