Ceopag can do everything

Ceopag is a new sorbent that preserves the initial cation exchange properties of the matrix and acquires new characteristics: anion exchange activity, increased granule strength, enhanced adsorbtion characteristics, and also bactericidal properties.

Insufficient degree of industrial and residential wastewater purification, among other environmental problems, has lead to an essential degradation of water quality in most of the surface water sources.

Therefore providing people with high-quality drinking water is becoming more and more urgent.

Existing technologies for water preparation and decontamination often fail to comply with the current standards for water purification. Application of sorbents at the basic or final stage of the technological process allows reaching the required purity degree.

Natural zeolites (e.g. clinoptilolite-containing tuffs) are widely applied in water preparation technologies as filtering and sorbing media. Zeolites are crystalline microporous alumosilicates that have unique physical and chemical properties, in particular, ion-exchange activity and high selectivity with respect to a series of cations.

This allows using zeolites for purification of drinking water from radionuclides (strontium, caesium) and heavy metal cations. Zeolites are also applied for industrial sewage purification from ammonium ions and for deactivation of wastewater of nuclear power plants.

The relatively low cost allows using zeolites instead of sand ballast as filtering medium in water treatment facilities.

The experts of the Institute of Ecotechnologies have developed and implemented the technology for zeolite modification with organic compounds called polyalkylene guanidines.

New sorbent Ceopag is the result of these studies, and it has a number of essentially new features in addition to the initial cation exchange properties of the matrix. In particular, the sorbent acquired anion-exchange properties characteristic for organic polycations, and bactericidal activity. Besides, its strength parameters (wearability, grindability) were enhanced as well as its adsorption properties.

The studies have shown that the Ceopag samples obtained with modification of natural zeolite tuff have a relatively high selectivity towards chromates and sulphates. They sorb effectively one of the most hazardous and toxic elements, arsenic, and also sorb and retain aromatic hydrocarbons and phenols.

Besides, the surface of Ceopag granules becomes hydrophobic due to the modification of zeolite with organic cationic polymers. This enables Ceopag to absorb organic compounds from water solutions and dyes from wastewater of tanning, fur, and textile industries with a high concentration of dyes (>1000 mg/ l).

Bactericidal and virucidal properties of Ceopag are especially remarkable. These properties ensure water decontamination during filtering through a sorbent layer. The studies have shown that disinfection efficiency as high 99-100% can be achieved for a set of optimal parameters (filtration rate, granule size, and contact surface).

The Institute of Ecotechnologies obtained remarkable results in the experiments on modification of aluminosilicate sorbents developed and produced by ALSIS, Ltd. with polyguanidines.

The sorbents Sorbent ASTM were developed for water purification from non-ferrous heavy metals (copper, nickel, cadmium, lead, etc.), and also from iron, manganese, hydrogen sulphide, phenol, oil products, and radionuclides.

The studies have shown that after 10 minutes of heavily contaminated water (1*107 CFU/ml) being in contact with this aluminosilicate sorbent modified with polyguanidines, no test microorganisms were found on the sorbent surface.

Alexander DITYUK, Ph.D (physics).

Deputy Director,

Institute of Ecotechnologies

Sergey MARTYNENKO

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