Abstract:
The objectives of this study were to investigate the effects of chelating agent, ethylenediaminetetraacetic acid (EDTA), on chromium and lead adsorption from synthetic solution by biomass of Ananas comosus (L.) Merr. in both batch and column experiments. The aims of the batch experiment were to study efficiencies and adsorption capacities of biomass in removing chromium and lead at different pH, EDTA concentration. In order to find ability of adsorbent, isotherm test was conducted. The aim of column experiments were to study the efficiencies of chromium and lead removal measuring in term of wastewater pass through the column before the chromium and lead concentrations in water exceed the industrial wastewater standards. The batch experiment results shown that chromium and lead adsorption capacities increased with decreasing solution pH in the range of study. The presence of EDTA, at a EDTA concentration of 150 ppm showed the maximum chromium and lead adsorption efficiencies. Expected that EDTA effect of gravity on biomass, if addition of EDTA in the appropriate concentration the results showed that the adsorption of biomass efficiencies increased but if addition of EDTA in exceed concentration the results showed that the adsorption of biomass efficiencies decreased. From adsorption isotherm test cannot conclude exactly by langmuir isotherm and frundlich isotherm due to the nearby R2 equal. Adsorption capacities are 81.15 and 40.19 mg/g biomass. The column experiment results shown that the volume of wastewater pass through the column ensured the chromium and lead concentrations in filtered water complied with the industrial wastewater standards in every experiment which take 20 times of batch experiment to reach equilibrium. The average efficiencies to reach the breakthrough point of chromium and lead adsorptions were 99.46 and 99.57 respectively