Hybrid processes evaluation of pb(Ii) removal from wastewater effluents

Abstract

The hybrid processes potential on Pb(II) removal from wastewater effluents have been investigated. Batch test conditions were carried out to examine the effects of initial metal concentration, adsorbent dose, contact time, temperature and initial solution pH on adsorption of Pb(II) ions from aqueous solution onto wheat bran. The highest adsorption efficiency was observed at solution pH 5, contact time 30 min and temperature 25oC. The adsorption equilibrium data correlate well with both Langmuir and Freundlich isotherms. Thermodynamic studies suggested the spontaneous and exothermic nature of adsorption process. The retentate of power plants wastewater sample pretreated with wheat bran was used as feed for reverse osmosis low-pressure heterogeneous membrane treatment. The high removal efficiency of Pb(II) and co-existed ions from the above wastewater sample was achieved by hybrid processes with high preference for re-use.