Международна научна конференция “УНИТЕХ’06” – Габрово III-377 ‘ 06 INTERNATIONAL SCIENTIFIC CONFERENCE 24 – 25 November 2006, GABROVO THERMODYNAMIC AND KINETIC STUDY OF CR 3+ IONS SORPTION ON RESIDUAL CELLOLIGNINE Suteu Daniela Department of Environmental Engineering and Management, Faculty of Industrial Chemistry, Technical University “Gh.Asachi” Iasi, Blv. D. Mangeron nr. 71A, P.O. Box. 10 – 2002, 700050,I asi, Romania Zaharia Carmen Department of Environmental Engineering and Management, Faculty of Industrial Chemistry, Technical University “Gh.Asachi” Iasi, Blv. D. Mangeron nr. 71A, P.O. Box. 10 – 2002, 700050,I asi, Romania Abstract The discharge of heavy metals as Pb, Cr, Hg, Cu, Cd, Ni, etc. into aquatic environment has become a matter of concern in the whole world over the last few decades. Alongside to the conventional treatments for removing heavy metal ions from natural or wastewater, a new treatment based on specific sorption onto unconventional materials has been developed. This procedure is cheaper, easily to maintain, requiring no special skills to operate, and it is locally available. In this context, we extend our researches on residual cellolignine, trying to evaluate the analytical sorption potential to remove Cr 3+ ions from aqueous solutions. The paper is focused on the important aspects concerning Cr 3+ sorption thermodynamic and kinetic onto residual cellolignine from wood industry. Keywords: cellolignine sorbent, depollution technologies, sorption, chromium +3 ions INTRODUCTION Nowadays, the environmental pollution attains dangerous limits after that it is affected and it will affect human health and ecosystem. Pollution and other types of environmental degradation can be considered as the result of combined effects of demographic explosion and acceleration of industrialization. Alongside the air, water is an essential element for life on Earth, so that preventing pollution and finding techniques and materials for advanced depollution of waste waters represents a priority for specialist into Environmental Sciences. The heavy metals represent an important category of natural or wastewater pollutants; at least 20 metallic ions are considered as toxic and half of these are received by rivers or municipal waters. The principal objective in wastewater treatment is eliminating or reducing of contaminant concentration that no affects the human health or ecosystem evolution. Some method of heavy metals removing from wastewaters has been considered: chemical precipitation, coagulation, ion exchange, reverses osmosis, solvent extraction [1-7]. These methods are characterized by incomplete removal of metals, limited tolerance to pH change, moderate or no selectivity for metals, requirement of high consumption of reagents and energy, very high or low concentrations levels of metals and production of toxic sludge or other waste products that also need treatment before disposal [7] To ensure a minimum impact of these issues, many researches lead to methods of high efficiency and selectivity allowing simultaneous achievement of preconcentration and analysis [8]. There is a need for alternative technologies, which might persuade workers to treat their wastewaters. New technologies must be inexpensive, easy to apply, requiring no special skills to operate and are locally available. From this point of view, the sorption onto unconventional materials (agricultural waste, waste materials from the seafood industry, alive or dried biomass) has recently become the subject of a considerable interest [7-16]. This procedure is cheaper, easily to maintain, requiring no special skills to operate.