Temperature effects on biofiltration by varying biofilters parameters

Abstract

At different biocharge temperature regimes (7, 14 and 28 0 C), the dynamics of temperature variations was recorded: higher temperatures (28 0C) vary in the biocharge as exponential dependence, and lower temperatures (7 and 14 0C) vary in the biocharge as linear exponential dependence. The impact of the temperature on biofiltration was assessed by changing temperature regime of the charge (7, 14 ir 280C) and the main parameters of the filter (charge height and airflow speed). During tests, different concentrations (up to 100 mg/m3) of volatile organic pollutants (butylacetate, butanol and xylene) were infected through the biocharge. It was found out that air cleaning efficiency depends on the filter charge temperature and pollutant nature For example, the increase in the number of the layers from one to five resulted in higher efficiency of air cleaning due to greater amount of the biocharge and higher concentration spontaneous chemoorganotrops. For example, with the initial concentrations of pollutants (butylacetate and butanol) amounting to 93-96 mg/m3 and the charge temperature of 70C, the air cleaning efficiency after the air passed one layer was 44-47%, and after passing five layers it increased by 14-15% and reached (58.8-60 %). Tests with different temperature regimes (7, 14 and 28 0C) of the biocharge reveal the dependence between the airflow speed and the filter efficiency. For example, when the charge temperature is 28 0C and the initial concentrations of butylacetate and butanol are 30–100 mg/m³, reduction on the airflow speed (from 2,0 to 0,8 m/s) results in longer contact of pollutants with the charge and better air cleaning result (from 76 to 92 %).