Treatment of pig farm effluents by aeration, struvite precipitation and filtration

0471417 - MBÚ 2017 RIV CZ eng J - Journal Article
Lhotský, O. - Sýkorová, E. - Hudcová, T. - Filipová, Alena - Cajthaml, Tomáš
Treatment of pig farm effluents by aeration, struvite precipitation and filtration.
European Journal of Environmental Sciences. Roč. 6, č. 2 (2016), s. 73-83. ISSN 1805-0174
Institutional support: RVO:61388971
Keywords : struvite * aeration * piggery effluent
Subject RIV: EE - Microbiology, Virology

These experiments were performed to verify the potential ways of treating pig farm effluents using aeration, struvite precipitation and
filtration. MgCl2 brine was added as a source of magnesium for struvite precipitation. Following aeration, precipitated struvite was separated
from the effluent by filtration through a compressed straw filter. The filter plus struvite can be composted to yield struvite-enriched compost.
A series of 5 batch pilot-scale experiments (effluent volumes from 200–400l) was carried out and laboratory tests on the same effluent were
performed to validate the pilot-scale results. Following 24 hours of aeration the pH increased to from 8.5 to 9, providing good conditions
for struvite precipitation. Filtration proved to be efficient for separating precipitated struvite and total suspended solids. The efficiency
of orthophosphate phosphorus removal in the pilot system varied from 63 to 96%, ammonia nitrogen removal varied from 22 to 79%,
but magnesium removal efficiency was low due to the high natural Mg concentration, suggesting that the addition of Mg might not be
necessary. Chemical oxidation demand declined significantly as a result of very high bacterial activity and the treated effluent no longer
had an unpleasant smell.
Permanent Link: http://hdl.handle.net/11104/0269115