title: A study of NH3-N and P refixation by struvite formation in hybrid anaerobic reactor.
abstract: This research is concerned with the removal of ammonia nitrogen and phosphorus in foodwaste by crystallization. Reductions have been achieved by struvite formation after the addition of magnesium ions (Mg2+). Magnesium ions used in this study were from magnesium salts of MgCl2. The results of our analysis using scanning electron microscopy and energy dispersive X-ray analysis showed that the amount of struvite in precipitated sludge grew enough to be seen with the naked eye (600-700 microm). EDX analysis also showed that the main components of the struvite were magnesium and phosphorus. NH3-N removal efficiency using MgCl2 was 67% while PO4-P removal efficiency was 73%. It was confirmed that nitrogen and phosphorus could be stabilized and removal simultaneously through anaerobic digestion by Mg, NH3 and PO4-P, which were necessary for struvite formation.
authors.affiliation: Department of Environmental Engineering, Chonnam National University, Gwangju 500-757, Korea. jjlee@cnu.ac.kr
authors.forename: J J
authors.initials: JJ
authors.lastname: Lee
authors.forename: C U
authors.initials: CU
authors.lastname: Choi
authors.forename: M J
authors.initials: MJ
authors.lastname: Lee
authors.forename: I H
authors.initials: IH
authors.lastname: Chung
authors.forename: D S
authors.initials: DS
authors.lastname: Kim
mesh_terms: D000641:Ammonia / Q000737:chemistry*; D001421:Bacteria, Anaerobic; D001674:Bioelectric Energy Sources; D019149:Bioreactors; D011232:Chemical Precipitation; D003460:Crystallization; D005308:Fertilizers; D019649:Food Industry; D017616:Magnesium Compounds / Q000737:chemistry*; D009584:Nitrogen / Q000302:isolation & purification*; D010710:Phosphates / Q000737:chemistry*; D010758:Phosphorus / Q000302:isolation & purification*; D012037:Refuse Disposal / Q000379:methods*; D000069877:Struvite
chemical_list: D005308:Fertilizers; D017616:Magnesium Compounds; D010710:Phosphates; D010758:Phosphorus; D000641:Ammonia; D000069877:Struvite; D009584:Nitrogen