Continuous metal removal from solution and industrial effluents using Spirogyra biomass-packed column reactor

The granules of Spirogyra neglecta biomass, diameter 0.2–0.5 mm, were successfully prepared by boiling it in urea–formaldehyde mixture. Metal sorption performance of the column packed with Spirogyra granules was assessed under variable operating conditions, such as, different influent metal concentrations, bed heights and flow rates. These conditions greatly influenced the breakthrough time and volume, saturation time and volume, and the ability of the column to attain saturation after reaching the breakthrough. The experimental breakthrough curves obtained under varying experimental conditions were modeled using Bohart–Adams, Wolborska, Thomas, Yoon–Nelson and modified dose–response models. The first two models were valid only in representing the initial part of the breakthrough curves; however, the other three models were good in representing the entire breakthrough curve. The granule-packed column could be successfully used up to 6 and 9 cycles of sorption and desorption for the removal of Cu(II) and Pb(II), respectively. The column could efficiently remove different metals from real industrial effluents, and hence the test biomass (Spirogyra granules) is a good candidate for commercial application.

Experimental breakthrough curves for the sorption Pb(II) by the Spirogyra granule-packed column at different bed heights.Figure optionsDownload high-quality image (87 K)Download as PowerPoint slideHighlights
► Spirogyra granule-packed column promisingly sorbed metals from aqueous systems.
► Operating conditions greatly influenced the service time of the column.
► Several empirical models successfully predicted experimental breakthrough curves.
► The column showed good reusability during multiple cycles of sorption–desorption.
► The column efficiently removed several metals from real industrial effluents.