Modelagem da decomposição aeróbia de lodo de esgoto em solos com diferentes texturas

AUTOR(ES)

Cláudia Rodrigues Teles

DATA DE PUBLICAÇÃO

2007

RESUMO

The overall assessment of soil clay content on several phases of sludge decomposition, monitored as CO2 evolution, was the main objective of this work. Different soil textures obtained from the same sample matrix allowed correlations of the soil clay content, microbial biomass and organic carbon using soil respiration monitored as cumulative CO2 generation. Data and correlations obtained in this work is unique due to scarcity of literature reports on this approach. Analyses were performed using air dried and rehumidified soil samples with incorporation of anaerobic sludge. Soil samples from the same matrix and different clay content showed a significant effect on CO2 production in the initial 15 days of incubation (r=0,92** for the first week and r=0,89** for the second week) and initial 7 days for soil + sludge (r=-0,77**). The effect of sludge dose on decomposition process was analysed by using a soil substrate composed by vermiculite and sand ( 1:1 mass) and soil respiration was monitored through cumulative CO2 production. It was possible to establish the threshold values for sludge application in these soils based on respiration rates (r=0,86**) for the 7th day using 0,6; 1,2 and 2,4g 100g-1 dosage and the inhibitory dosage effect on sludge decomposition by the soil. Kinetic split models were used in combined substrates: vermiculite + sand and soils with different textures. In both cases, the best fit was a first order biphasic models for the fast and slow phases in soil sludge decomposition process. The main parameters associated to the fast and slow phases were correlated to the sludge dose effect and clay content respectively. From these findings, a mathematical model was proposed, considering these two factors for soil sludge decomposition process based on respiration rates as cumulative CO2 production.

ASSUNTO(S)

clay content microbial activity tratamentos e aproveitamento de rejeitos cinética química mathematical modeling organic carbon respirometria do solo carbono orgânico teor de argila modelagem matemática chemistry kinetic soil respirometry atividade microbiana

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