Nickel Biosorption from Aqueous Solutions Using Bios lids

Recently, the use of biological absorbent in removal of hazardous pollutants such as heavy metals has increased because of the decrease in sludge problems, economical issues, high efficiency and compatibility with the environment. This study was done over the Biosorption of Nickel by Biosolids obtained from the municipal wastewater treatment in a batch reactor. The pretreatment of the Biosolids includes dewatering, grinding and grain sizing with meshes between 50 to 120. Nickel adsorption kinetics follows the pseudo second model and maximum equilibrium adsorption observed at two hours. The optimum stirring rate in this system is 150 to 250rpm. The increase in pH results in adsorption increase and there is a significant adsorption increase between 3 and 4. The results from adsorption modeling shows that the Nickel adsorption follows the Langmuir model and the maximum Nickel adsorption (qmax) by biosolids is 0.195 milimole per gram of dry biosolids (11.442 mg/g) and the Langmuir constant (kd) is 0.238 milimole per liter (13.96 mg/lit).