The effect of solid-liquid effluents from anaerobic digesters on soilmicrobial activity |
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| Authors: | N Barros B Ramajo J R García |
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| Institution: | (1) Department of Applied Physics, Faculty of Physics, University of Santiago de Compostela, Santiago, Spain;(2) Department of Organic and Inorganic Chemistry, Faculty of Chemistry, University of Oviedo, Oviedo, Spain |
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| Abstract: | A calorimetric procedure is developed to study the effect on the soil of the effluents resulting for the anaerobic digestion
of slaughtering houses residues. DSC was used to study the pyrolysis properties of the effluent and the soil while isothermal
calorimetry is applied to study the microbial activity in the effluent and to assess on its effect on the microbial activity
of the soil where the industrial digester will be situated. The calorimetric data were studied together with the chemical
and biological properties of that residue. Results showed that effluent is constituted by low levels of carbon and high levels
of nitrogen. The power-time curves of the effluent have the typical shape of microbial growth yielding microbial growth rate
constants between 0.37 and 0.53 h−1 for about 4 and 11 h. The addition of the effluent to the soil decreases the heat of pyrolysis with time and stimulates the
heat flow rate of the microbial metabolism. |
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| Keywords: | anaerobic digestion calorimetry soil |
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