Application of white rot fungi living cells in bioremoval of chromium from tannery industries effluent by using of bench scale

ABSTRACT

Tannery industries effluent disposal into environment causes hazardous effects in environment. The goals were to determine the tolurance limit P. chrysosporium in the tanning house effluent and potential of chromium removal in the bench scale. At first, sampling of tanning house effluent, in order to effluent quality evaluation was carried out. Then adjusting carbon to nitrogen ratio from 10-12. Dry weight of fungi mass [0.35% - 2.1%] inoculated to sterile samples with Cr[+3] concentration 120 - 1080 mg/I. Samples were put in shaker incubator. Also effect of pH, temperature, shaking velocity and nutrients for finding optimum conditions, biomass growth and chromium removal rate were studied. Findings showed that maximum biomass growth and chromium removal rate were occurred in the sample that chromium concentration and inoculum size were 240 mg/I and 0.07% [dry weight], respectively. Also biomass growth and chromium removal rate were 0.04823% and 76.7%, respectively. Biomass growth and chromium removal in best condition and 26h detention time rate were 0.2934% and 95.8%, respectively. This study showed by optimizing environmental conditions, with 95% confidence [P<0.001], after 26h. biomass growth and chromium removal rate would be 0.29% and 95.8% respectively