Keywords: adsorption, chemically treated sawdust, pH, desorption, wastewater treatment, chemical treatment, chromium removal, aqueous solutions, process parameters, timber industry, waste treatment, reusability
Use of chemically treated sawdust for chromium removal from aqueous solutions: effect of process parameters
This paper reports the effect of various process parameters on the removal of chromium from aqueous solution using formaldehyde–treated timber industry waste (sawdust). The adsorbent was characterised by Scanning Electron Microscopy (SEM) and Energy Dispersive X–Ray Analysis (EDAX). Influence of chromium concentration, pH, adsorbent dose and contact time on chromium removal from aqueous solution has been investigated. Maximum chromium removal was 83.5% at pH 2 with 20 g L–1 adsorbent dose and 120 min contact time. Reusability of the adsorbent was examined by desorption in which HCl eluted 76% chromium from exhausted adsorbent.