Lighting the anaerobic digestion process in rural areas: struvite from cattle manure digestate

The aim of this research was recovery nutrients (PO43- and NH4+ ions) in form of struvite, used cattle manure digestate from low cost anaerobic digester. In order to determinate operating variables (Mg2+: PO43- molar ratio, reaction time and stirring speed) an experi-mental 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 PO43-, 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.


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País:     Colombia

Autor(es):   

Año:     2018

ISSN:    78 - 88

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