Removal of Lead from Metal Conaminated Industrial Waste Water By Adsorption onto Banana Peel

Abstract

Banana peel, a fruit waste was used to produce biosorbant through environment friendly process. Banana peels were washed, dried and ground, before being used for treatment of industrial waste water and used for lead removal. The experiments were carried out by different concentration of dosage for incubation time 24 hours in the batch mode for the measurement of adsorption capabilities. The powdered as an adsorbent, in orbital shaker at 150 to 180 rpm at 25˚C. 8ml waste water sample was used in triplet, each was kept with 10mg, 20mg, and 30mg concentration of banana peel and obtained equilibrium adsorption capacity was 0.649, 0.184, 0.021mg/L respectively. The separation of bio adsorbent and solution was carried out by filtration with Whatman Filter Paper No.42 and the filtrate stored in sample cans for determine the metal lead ion concentration using Atomic Absorption Spectrophotometer (AAS). Heavy metal ions were estimated before and after addition of powdered adsorbents. The powder of that bio sorbent was used for treatment of waste water with different proportion of adsorbents, variation of pH and contact time. Lead adsorption onto banana peel was depended upon the controlling parameter such as pH, conductivity, Total Dissolved solids, Salinity, Sodium, Potassium by Flame Photometer and Lead ion concentration by Atomic Absorption Spectrophotometer (AAS). Slightly basic water (pH = 8.3) was found to be suitable for lead removal. Equilibrium data were well fitted (R2 = 0.998) with the Langmuir and Freundlich isotherms. The monolayer adsorption capacity was 0.025 mg/L on 30 mg banana peel. The calculated RL and ‘n’ values has proved the favorability of lead adsorption onto banana peel. Lead adsorption was followed the second order kinetic properly rather than other models. Solvent 0.1N Sulphuric acid showed higher desorption of lead (60%) and adsorption-desorption process can be continued till seven cycles efficiently. Keywords: Banana peel, Bio sorbents, heavy metal, lead, atomic absorption spectrophotometer