Heavy metals removal from water by wood sawdust, pulp and lignin
2002
Sciban, M.B.
The possibility of adsorption of different heavy metals fromwater by sawdust of different species of wood, pulp, and Kraft lignin has been investigated. Oak and black locust sawdust, Kraft lignin were shown to be the most efficient adsorbents for heavy metals in cationic form. Kraft lignin and fir sawdust were shown to be the most efficient adsorbents for chromium anions. Previous treatment of wood sawdust by sodium hydroxide solution can increase its adsorption capacity. Better adsorption efficiency was accomplished: when smaller parts of sawdust were used, when a large amount of sawdust was used and/or two stage process was applicated, and adsorption process was done on higher temperature. There were established: optimum initial pH value for different heavy metals, optimum adsorbent - water contect time, and degree of influence of other different heavy and light metals, and anions on adsorption efficiency. Adsorbed heavy metals acn be desorbed from wood sawdust with solutions of different mineral acids. Sawdust can be applied in several cycles of adsorption - desorption, with some decrease of adsorption capacity. Investigated adsorbents can be also used in dynamic conditions of adsorption in column.
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