Abstract
The use of low-cost locally available adsorbent, sawdust for the removal of methylene blue (MB) dye in a batch adsorber system has been investigated. The experimental data fitted best in Langmuir isotherm as compared to Freundlich and Temkin isotherms, showing maximum adsorption capacity of 76.92 mg/g. The study revealed that the adsorption of MB dye onto sawdust follows pseudo-second-order kinetic model and the same has been used in design of a two-stage batch adsorber by minimizing total contact time to attain a fixed percentage of MB dye removal. The minimum contact time required for the removal of MB dye with 99% efficiency has been found as 37.54 min.
Highlights
The textile dyeing industry consumes large quantity of water and produces huge volume of colored wastewater from different steps in the dyeing and finishing processes (Hameed, 2009)
This study focuses on searching low-cost adsorbent for dye removal from effluent and designing a two-stage batch adsorber model for the adsorption of methylene blue (MB) dye
Kini et al (2013) studied the MB dye on acid-treated sawdust and found that the rate of removal of the dye seen under acidic conditions was more as compared to that under alkaline one
Summary
The textile dyeing industry consumes large quantity of water and produces huge volume of colored wastewater from different steps in the dyeing and finishing processes (Hameed, 2009). Many of the small scale industries in India and developing countries are still discharging colored wastewater into surface water bodies due to high cost of color removal, several studies have demonstrated adsorption process using various adsorbents for removal of dyes. The present study was performed to demonstrate the use of locally available low-cost adsorbent (sawdust) for removal of the dye from colored wastewater coming out from textile dyeing industry. We have given design of two-stage batch adsorber system for removing fixed percentage of the dye from colored wastewater by minimizing contact time for ready use by small scale industries. The methylene blue (MB) dye was taken in this study because of its known strong adsorption nature onto solids (Hameed, 2009)
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