Struvite crystallization mitigates reactive N losses from swine manure in-vessel composting.
Struvite crystallization mitigates reactive N losses from swine manure in-vessel composting.
Author(s): NICOLOSO, R. da S.; HIGARASHI, M. M.; OLIVEIRA, L. V.; DALLA COSTA, M.
Summary: ABSTRACT: We assessed the addition Mg and P salts to promote struvite crystallization and mitigate reactive N losses from a rotating drum (12 m3 ) used for in-vessel composting of swine manure. The tested treatments were: mixture of sawdust and swine manure (baseline) and the same mixture with the addition of magnesium sulfate and phosphoric acid (MgSO4+H3PO4). Struvite crystallization decreased NH3-N and TN losses by 96.5 and 46%, respectively. Higher N2O-N emissions were related with resolubilization of the struvite under lower pH conditions. Further research is needed to assess strategies for the stabilization of struvite crystals, minoring N losses and increasing nutrient concentration value of the organic compost.
Publication year: 2017
Types of publication: Paper in annals and proceedings
Unit: Embrapa Swine & Poultry
Keywords: Abate, Adubo orgânico, Compostagem, Suíno
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