title: Removal and recovery of nutrients as struvite from anaerobic digestion residues of poultry manure.
abstract: The removal and the recovery of nutrients, namely nitrogen (N) and phosphorus (P) from anaerobically digested and solid-liquid separated manure effluents via struvite precipitation were investigated. Both the liquid and the solid phases of the poultry manure digester effluent were subjected to struvite precipitation experiments. The Mg:N:P molar ratio of 1:1:1 in the liquid phase resulted in an average NH4-N removal efficiency of 86.4%, which increased to 97.4% by adjusting the Mg:N:P ratio to 1.5:1:1. The acidic phosphorus-dissolution process was applied to the solid phase of the effluent to obtain a phosphorus-enriched solution. Nutrient recovery experiments with NaOH as the buffering reagent were conducted with and without addition of external chemicals (Mg and P sources) to evaluate the influence of the Mg:N:P molar ratio, the Mg:P molar ratio and pH. All the experiments depicted complete PO4-P (99.6-100.0%) and partial NH4-N (3.3-65.6%) recoveries from the phosphorus-enriched solution.
authors: Department of Environmental Engineering, Middle East Technical University, 06531 Ankara, Turkey.
authors: Y D
authors: YD
authors: Yilmazel
authors: G N
authors: GN
authors: Demirer
mesh_terms: D000818:Animals; D001421:Bacteria, Anaerobic / Q000378:metabolism*; D017616:Magnesium Compounds / Q000737:chemistry*; D008372:Manure / Q000382:microbiology*; D009584:Nitrogen / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D010710:Phosphates / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D011200:Poultry / Q000382:microbiology*; D012037:Refuse Disposal / Q000379:methods*; D000069877:Struvite
chemical_list: D017616:Magnesium Compounds; D008372:Manure; D010710:Phosphates; D010758:Phosphorus; D000069877:Struvite; D009584:Nitrogen