The main target of the biosorption process is to remove heavy metal, which can be quite toxic even at low concentrations. Biosorption is particularly suited as a polishing step in wastewater with a low to medium initial metal concentration from a few to about 100 ppm . In high initial metal concentrations, biosorptive treatment of wastewaters may be economically applied by combining the pretreatment using other technologies such as precipitation, which is currently used for 90% of heavy metal removal or electrolyte recovery. As a result of the biosorptive process, it offers high effluent quality and avoids the generation of toxic sludge. Figure 17.7 shows several designs utilizing biosorption in the contaminated sites.
Was this article helpful?