Research of efficiency of natural and modified sorbents for purification of industrial sewage from heavy metal ions

Abstract

The paper describes the research of efficiency of natural and modified sorbents used for purification of industrial sewage from ions of heavy metals (Fe, Cd, Zn, Cu, Cr). Sorbents of various structures are produced on the basis of waste of the mining and processing works (MPW), nonmetallic materials (montmorillonite, dolomite) and modified by humic compounds with thickness of applied layer from 50 nanometers to 100 microns. The choice of structure of the modified sorbents has been determined by the aim to use positive properties of all components as much as possible: their high sorption and regeneration properties. Besides, application of the humic compounds disengaged from peat and waste of brown coal on surface of sorbents caused significantly increased adsorptive activity due to existence of broad set of groups and fragments in structure of humates. These groups and fragments (acid, amino-acid, spirit, carbohydrate, phenolic, amino-keto-alcohol, etc.) form complexes practically with all heavy metals. Use of three main specified components as a part of sorbents resulted in synergetic effect and also allows receiving the highly effective and at the same time inexpensive, rather universal materials with high sorption properties.

Keywords

• sewage
• purification
• ions of heavy metals
• sorbents
• waste of MPW
• montmorillonite
• dolomite
• humic substances
• sorption properties
• extent of absorption