Abstract

CASTRO-MOLANO, Liliana del Pilar et al. Lighting the anaerobic digestion process in rural areas: struvite from cattle manure digestate. Rev. colomb. biotecnol [online]. 2018, vol.20, n.2, pp.78-88. ISSN 0123-3475.  https://doi.org/10.15446/rev.colomb.biote.v20n2.71184.

The aim of this research was recovery nutrients (PO4 3- and NH4+ ions) in form of struvite, used cattle manure digestate from low cost anaerobic digester. In order to determinate operating variables (Mg2+: PO4 3- molar ratio, reaction time and stirring speed) an experimental design was developed. Struvite crystal was identified by mean of petrographic microscopy and infrared radiation. The highest recovery rates of 55±4.94 % and 58±7.72 % for NH4+ and PO4 3-, respectively was achieved at 1.5 molar ratio, 50 minutes reaction time and 450 rpm stirring speed. Struvite yield was 295.75 mg/L. These results show that the highest phosphate recovery is achieved with the magnesium concentration (153 mg/L) contained in the cattle manure digestate.

Keywords : cattle manure, digestate; household digester; struvite.

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