Biosorption of Cr (VI) from aqueous solution using excess municipal sludge

Year 2015, Volume: 36 Issue: 3, 2289 - 2298, 13.05.2015

Somaye Rahımı , Farzaneh Mohamadı Amir Taebı

Abstract

Abstract. Heavy metals are one of the most important pollutants in industrial wastewater. Chromium is one of hazardous metals that use in electroplating, leather tanning, metal finishing and chromate manufacturing industries. The commonly used procedures for removing metal ions from aqueous streams include chemical precipitation, lime coagulation, ion exchange, reverse osmosis and adsorption. In this study, removal of Cr(VI) from aqueous solutions by Excess Municipal Sludge was investigated as a function of initial metal concentration (in the range of 5-90 mg/l), initial pH (in the range of 2-8), agitation speed (in the range of 50-200 rpm), adsorbent dosage (in the range of 2-10 g/l) and agitation time (in the range of 5-480 min) in a batch system.. A removal of 96% was achieved under optimized conditions. The mechanism of metal sorption by adsorbent gave good fits for Freundlich and Langmuir models with max q value of 41.69 mg/g.

Keywords

Hexavalent Chromium, Biosolid, Biosorption, Wastewater, Industrial

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