Study of tea compost column biofilter efficiency to remove some heavy metal ions from aqueous solutions
Author(s):
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
Tea compost was assessed as a biosorbent by using a continuous up-flow fixed-bed column for removing of Pb2, Co2, Ni2 and Cu2 ions from aqueous solutions. The effects of various parameters such as pH, contact time, metal concentration, flow rates and amount of adsorbent on the process was investigated. The adsorption efficiency was found to be pH dependent, increasing by increasing of pH. Maximum removal of ions was obtained at pH=5 for tea compost. The equilibrium time was attained after 30 min and desorption studies was performed using diluted HNO3 (1 M) from tea compost. The results illustrated that adsorbed metal ions could be recovered under acidic conditions. Investigations the kinetics of the process were performed considering pseudo second-order model. This model predicted chemiosorption as the adsorption mechanism of the process. In addition, Thomas, BohartAdams and Yan kinetics models were studied The Thomas and BohartAdams model appeared to describe the experimental results better. Langmuir, Freundlich and Temkin models were tested for describing the equilibrium data. The Freundlich isotherm illustrated the best description of the cobalt, copper, nickel and lead adsorption mechanisms on tea compost. Results showed is more the in 30 min efficiency of tea compost column biofilter in removing heavy metals that can be remove than 95%.
Keywords:
Language:
Persian
Published:
New Materials, Volume:7 Issue: 4, 2017
Pages:
67 to 80
magiran.com/p1770851
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