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Abstract
The increasing awareness of the potential environmental impacts of heavy metal pollution and the techno‐economic limitations of conventional metal removal techniques have led to the study alternate, inexpensive methods. Lignin, an easily available polymer from pulp and paper industry waste, appears to he an attractive material for heavy metal removal.
Copper removal by lignin is affected by both copper and lignin solution pH as well as the lignin dose. Copper removal is also markedly influenced by the extent of lignin in suspension and the final pH of the filtrate. Maximum (95%) Cu removal was obtained with both lignin and copper solution pH at 5.5 and a 1ignin dose of about 1 g/l. The optimum final pH corresponding to maximum Cu removal was between 4.4 and 5.0. Inhibition by hydrogen ions at low pH and dissolution of the lignin‐metal complex at higher pH result in poor copper removals.
Notes
Natioaal Environmental Engineering Research Institute, Nagpur 440 020, India