DBPapers
DOI: 10.5593/sgem2012/s16.v4012

MAXIMUM RATE OF SOLID PIG SLURRY IN ORGANO-MINERAL FERTILIZER FORMULATION

L. KHIARI, I. PARENT LION, A. KARAM
Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 4, 133 - 140 pp

ABSTRACT

There is an increasing interest in the recycling of by-products and waste materials with
low concentration of nutrients, such as the separated solid fraction of pig slurry with or
without composting (SPS), for land application as fertilizers or soil amendments. In
Canada, these ‘low-analysis‘ fertilizers are regulated by The Fertilizers Act and
Regulations. According to the Canadian Fertilizer Act, %N + %P2O5 + %K2O in a
mixed fertilizer (low-analysis fertilizer + mineral fertilizers) should be not be less than
24%. In the context of sustainable agriculture, it is necessary to develop organo-mineral
fertilizers (OMF) containing SPS that do not pose a risk of adverse effects to the
environment. This study aimed to determine the maximum amount of SPS that can be
added to mineral fertilizers in order to obtain an OMF that contain 24% of N + P2O5 +
K2O. Two commercial mineral fertilizers, monoammonium phosphate [MAP (11-52-0)]
and diammonium phosphate [DAP (18-46-0)], and 14 pig slurries were used in this
study. The concentration of total N in SPS ranged from 0.9 to 4.3%, P2O5 from 2.3 to
14.2% and K2O from 0.6 to 4.0%. The amount of N+P2O5+K2O varied from 5.2% in
SPS obtained by means of flocculation using a polymer + rock dust to 19.1% in SPS
obtained by means of flocculation-sedimentation using magnesium by-products. The
maximum amount of SPS to be used in mineral fertilizers mixture varied from 68 to
89% by weight of the OMF, depending of SPS type. There is obviously a great deal of
research needed to optimize manufacturing starter OMF pellets containing more SPS
than ammonium phosphate fertilizers.

Keywords: solid pig slurry, fertilizer formulation, Canadian fertilizer standards.

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