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- Title
The effect of solid-liquid effluents from anaerobic digesters on soilmicrobial activity.
- Authors
Barros, N.; Ramajo, B.; García, J. R.
- 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.
- Subjects
SOIL testing; CALORIMETRY; TEMPERATURE measurements; ANAEROBIC digestion; CHEMICAL processes; CHEMICAL reactions
- Publication
Journal of Thermal Analysis & Calorimetry, 2009, Vol 95, Issue 3, p831
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-008-9419-y