Evaluating the effect of soil flushing with surfactant on the biodegradation of soil contaminated by diesel oil. / Avaliação do efeito da lavagem com surfactante na biodegradação de um solo contaminado por óleo diesel.

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

06/06/2011

RESUMO

Diesel fuel is one of the most petroleum derivates consumed in Brazil and responsible with large numbers of contaminated areas. While there are consecrated techniques for the removal of diesel oil-free phases, vapor and dissolved, the solutions to remove the residual phase still need greater efficiency and/or lower cost. This work shows the results of a laboratory investigation of the removal of PAH undisturbed samples of soil contaminated with diesel oil by soil flushing tests with solutions of surfactant Sodium Lauryl Sulfate (SLS) at concentrations of 0,6, 1,5 and 3 CMC (critical micelle concentration), followed by a respirometric test to assess the ability of aerobic biodegradation. A device was developed specifically for the test column using their own sampling rings. The results showed that only the solution with 3 CMC concentration was able to remove PAH concentrations above the detection limit of the analytical technique, and that this removal was less than 7.6% of residual mass in the soil. The results showed in the soil respirometry without the addition of surfactant biodegraded on average 1% per week of the initial contaminant. The influence of flushing on the biodegradation has not established a regular pattern and lasted about two weeks. The biodegradation after the period of influence of the surfactant was highly correlated linearly with the initial concentration of contaminant.

ASSUNTO(S)

biorremediação diesel oil Óleo diesel surfactantes surfactants biorremediation soil (contamination) solos (contaminação)

ACESSO AO ARTIGO

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