Soluble Phosphorus Released by Poultry Wastes in Acidified Aqueous Extracts

Abstract

Research has shown that measured water-soluble phosphorus (WSP) from poultry litter might have been less than that released in the field. The effects of acidified extractions on soluble P (SP) concentrations were studied, and a buffer was selected to measure SP at pH 6.0, which is a target value for soil management in Georgia.Soluble P concentrations were extracted from poultry wastes at three pHs: 1) at natural pH, using deionized water (DI w ); 2) after titrating DI w suspensions with 1395 0.5N hydrochloric acid (HCl) to pH end-points 3.0, 4.0, and 6.0; and 3) at pH 6.0 with buffers of sodium (Na) acetate, potassium hydrogen phthalate (KHP), 2-(Nmorpholino) ethanesulphonic acid (MES), Na cacodylate, imidazole, N-(2-acetamido)-2-aminoethansulphonic acid (ACES), N-(carbamoyl-methyl) iminodiacetic acid (ADA), bis-(2-hydroxyethyl) imino]-tris-[(hydroxymethyl) methane (Bistris), and 1,4 piperazine-bis-(ethane sulphonic acid) (PIPES).Total SP increased 60% to 140% in suspensions acidified with HCl to pH 6.0 compared to suspensions at pH ! 8. Dissolved unreactive P responded more (2Â to 30Â) than molybdate reactive P(20 -100%). Buffers extracted more soluble minerals than suspensions acidified with HCl, probably because of their complexation ability. The most effective buffer was MES, because its effects seemed mainly due to acidification.

Study of pig manure digestate pre-treatment for subsequent valorisation by struvite

“…This is due to the release of acid in soluble form is very similar in all cases and the differences between tests may be because the liquid fraction contains more or less small particles that can make an extra contribution of phosphorus. All this is in accordance with what Tasistro et al ( 2007 ) or Szogi and Vanotti ( 2009 ) have reported.…”