Efecto del pH sobre el crecimiento de microorganismos durante la etapa de maduración en pilas estáticas de compost
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Date
2012-07-11
Journal Title
Journal ISSN
Volume Title
Publisher
Corporación Universitaria Lasallista
Abstract
Introduction. The increase in the organic products demand has generated a higher consuming
of composted materials, in order to increase the chemical and physical quality of
the soils and guarantee better crops. Besides, laws are being created and implemented
to rule the parameters for the organic manure production, processing and application in
Colombia and worldwide. There are many reasons to control the process in a production
plant: The smell, the standardization of properties to sanitize the final product and the
compost quality.
Objective. To evaluate the effect of the pH on the micro organisms growth in compostation
systems under passive ventilation and no ventilation.
Materials and Methods. The compostation process was made on the field with two
piles which were taken to their maturation stage. The samples were collected and incubated
in enriched BHI broth and with a pH adjusted to 5, 6, 7, 8 and 9. 24 hours later they
were seeded to count the bacteria, moulds and leavenings. Another sample was collected
at a field pH and the microorganisms were counted. In the statistic evaluation, the SAS
program was used.
Results. The pH effect is significant in the growth of bacteria, moulds and leavenings. For
the bacteria, the most influent pH was 5 for both piles. For the moulds and leavenings it
was 9 for the ventilated piles.
Conclusion. The results show the significant effect of pH on the growth of colony forming
units of mesophilic and thermophilic bacteria, moulds and leavenings. This fact cannot be
evaluated keeping away the others that intervene in the compostation, such as ventilation,
temperature, humidity and kind of substrate used as raw material.
Description
Keywords
Compost, Corporación Universitaria Lasallista, Abono orgánico, Compost, Unidades formadoras de colonias (UFC), Compost - Producción, Compost - PH, Microorganismos