title: Dairy manure treatment, digestion and nutrient recovery as a phosphate fertilizer.
abstract: A combined approach of biological treatment, solids digestion and nutrient recovery was tested on dairy manure. A sequencing batch reactor (SBR) was operated in three modes, in order to optimize nutrient (nitrogen and phosphorus) removals. The highest average removal efficiencies of 91% for NH4-N, 59% for PO4-P and 80% for total chemical oxygen demand (COD) were achieved. Staining experiments suggested the coexistence of glycogen and phosphorus accumulating organisms. Anaerobic digestion of wasted bio-solids was able to produce a PO4-P concentration of 70 mgL-1 in the supernatant. A pilot-scale experiment, designed to recover phosphorus in the supernatant as struvite (magnesium ammonium phosphate), was able to remove 82% of soluble PO4-P.
authors.affiliation: Department of Civil Engineering, University of British Columbia, Vancouver, Canada.
authors.forename: Asif
authors.initials: A
authors.lastname: Qureshi
authors.forename: Kwang Victor
authors.initials: KV
authors.lastname: Lo
authors.forename: Donald S
authors.initials: DS
authors.lastname: Mavinic
authors.forename: Ping Huang
authors.initials: PH
authors.lastname: Liao
authors.forename: Frederich
authors.initials: F
authors.lastname: Koch
authors.forename: Harlan
authors.initials: H
authors.lastname: Kelly
mesh_terms: D000818:Animals; D019149:Bioreactors; D002417:Cattle; D004063:Digestion; D005260:Female; D017616:Magnesium Compounds / Q000032:analysis / Q000302:isolation & purification; D008372:Manure; D009584:Nitrogen / Q000032:analysis / Q000302:isolation & purification*; D010100:Oxygen / Q000378:metabolism*; D010710:Phosphates / Q000032:analysis / Q000302:isolation & purification*; D012995:Solubility; D000069877:Struvite; D013997:Time Factors; D018505:Waste Management / Q000379:methods
chemical_list: D017616:Magnesium Compounds; D008372:Manure; D010710:Phosphates; D000069877:Struvite; D009584:Nitrogen; D010100:Oxygen