Sewage sludge is the promising raw material for biosorbent preparation. In this work, we evaluated the heavy metals adsorption characteristics of alkali treated sewage sludge (ATSS) by equilibrium studies. The adsorption isotherms were fitted with Langmuir and Freundlich models. Comparing with untreated sewage sludge, the total adsorption capacity (qm) of ATSS (prepared with mol/L NaOH) for Cd, Pb, Ni, increase d by , and mmol/g, respectively. When the NaOH concentration for ATSS preparation increase d from mol/L to mol/L, the qm of ATSS for Pb decreased from mmol/g to mmol/g. However, when the NaOH concentration increased from mol/L to mol/L, it showed increasing trend. According to the IR spectra data, the adsorption effect of biosorbent for heavy metals was mainly due to the complexation of - N-H groups and - COOH groups. | Effect of Alkali Treatment on Heavy Metals Adsorption Capacity of Sewage Sludge
