This scientific research is determined to a study of sorption process of heavy metal ions removal from aqueous solution at water purification with a help of sorption materials on a basis of residual biomass of microalgae and duckweed. It is known that Chlorella sorokiniana and duckweed Lemna minor have in their composition different valuable substances such as lipids, proteins, pigments, pectic substances. After their extraction residual biomass is formed. And in present study it is proposed for using as biosorbent for water purification. At different pH values the removal of ions of heavy metals (Zn(II), Cd(II), Pb(II), Cu(II)) occurs with varied efficiency; it is an important and informative parameter. Equilibrium and initial concentration of the solution with heavy metal ions were measured by voltammetric method of analysis with a use of special equipment. Chitosan was used as a component for making composite sorption materials with residual biomass of microalgae and duckweed. It is biopolymer which widely used in water purification. Due to this, prepared granules have good sorption properties. Nowadays in the era of technology and wide industrial production it is important and actual to develop new ecological technology and useful materials for water treatment and other fields for environment protection in general.

Results of experimental research of sorption purification of wastewater and surface water from petroleum and petroleum products by sorption materials on a basis of industrial waste have been given. Polyethylene terephthalate, ferritized galvanic sludge (FGS), oxidized and thermally expandable graphite have been chosen as the components of the sorption materials (SM). The sorption material on the basis of FGS has magnetic properties and it allows to extract the sorbent from water with the help of a magnetic separation. Physical and chemical properties of SM (buoyancy, water adsorption, petroleum capacity), kinetic regularities of the sorption of petroleum products by the sorption materials have been studied. Specific surface area, porosity, and particles dispersion have been determined. A possibility of using sorbents to collect petroleum products from the water surface has been shown.

The sorption properties of chitosan granules – the residual biomass of microalgae Chlorella Sorokiniana – that are formed after the extraction of valuable components from them (lipids, pigments, pectins) are studied. A literature analysis of the use of microalgae, chitosan and materials based on it for the purification of water from various pollutants has been carried out. The technique for obtaining chitosan granules – residual biomass is described, and their sorption properties are studied during the treatment of wastewater from iron(III) ions. The efficiency of wastewater treatment of iron(III) ions by chitosan granules is calculated – residual biomass, which for solutions with an initial concentration of 5 mg/l, it was 88 %. Microstructural studies of the surface of chitosan-residual biomass Chlorella Sorokiniana granules were carried out and their physicochemical and mechanical properties were studied. A comparative analysis of granules with DAK grade coal is given. It is shown that mechanical properties (abrasion, grindability) meet the requirements of GOST R 51641-2000. A technological scheme for the production, use and disposal of chitosan granules-residual biomass of Chlorella Sorokiniana is proposed.

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