Dairy manure treatment, digestion and nutrient recovery as a phosphate fertilizer.
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.
Qureshi
Asif
A
Department of Civil Engineering, University of British Columbia, Vancouver, Canada.
Lo
Kwang Victor
KV
Mavinic
Donald S
DS
Liao
Ping Huang
PH
Koch
Frederich
F
Kelly
Harlan
H
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
D017616:Magnesium Compounds; D008372:Manure; D010710:Phosphates; D000069877:Struvite; D009584:Nitrogen; D010100:Oxygen