Additional Determinations in a Potential Support Material for Toluene Biofiltration:Adsorption and Partition in the Nutrient Solution

摘要

This paper studies the adsorption properties in wet and dry conditions of a potential support material for toluene biofiltration.The material was able to retain 2.5 times less toluene when the contaminated airflow was fed either water-saturated or devoid of moisture,which is an indication of the relative exposed surface area accessible for adsorption.The correlation coefficients between Freundlich-modelled and experimental values(R~2 = 0.98)suggest that,within the tested range of toluene concentrations,this model is valid to describe adsorption equilibrium and that n exponent is near 1 when natural material is used as adsorption bed.In addition,the air-liquid partitioning constant values of toluene in water and in a nutrient solution used for biomass acclimation were determined.The constant obtained for the nutrient solution ranged from 0.167 to 0.224 for liquid toluene mass concentration(gamma_L)values ranging from 10.3 to 36.2 g m~(-3)at 298 K.By contrast,the constants in water varied from 0.221 to 0.277 for gamma_L values ranging from 7.86 to 27.6 g m~(-3).