SU916439A1 - Method for purifying effluents from cyanides - Google Patents

Description

The method relates to the purification of industrial wastewater of various types of production from cyanide by the biochemical method and can be used at the enterprises of non-ferrous metallurgy and coke-chemical production.

There are known methods for the biochemical purification of industrial wastewater from phenols, cyanides and rhodanides in aerotanks, biofilters and biological ponds [1].

The disadvantage of these methods is a long cleaning time, forced aeration and the introduction of additives of carbon-containing substances.

Closest to the present invention is a method of purifying wastewater from cyanides, including the cultivation of microorganisms that decompose cyanides. A strain of N o sac c is used in the syphilis. After the acclimatization of microorganisms, waste water containing cyanides is passed through the sludge [2_ |.

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The disadvantage of this method is that purification from cyanides is possible only in the presence of nitrides, which serve as an additional source of nitrogen and carbon. If there are no nitriles in the wastewater, they need to be introduced, which is impractical because the nitriles themselves pollute water and, therefore, require deep cleaning of these compounds. In addition, a known cleaning method requires artificial aeration with air.

The purpose of the invention is to simplify the process of wastewater treatment from cyanides.

This goal is achieved by the fact that wastewater treatment is carried out by microorganisms; as a microorganism, a complex of soil microorganisms is used for cleaning by microorganisms in the presence of blue-green algae Ηαραβθ5ί £ οη £ 0υ1ηα2ΐ £.

Blue-green algae are introduced into water in the amount of 40-50 mg / l for 1 hour of cyanide.

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In micro-biohazardous destruction: cyanides, ammonia is formed as the final product, which is used by blue-green algae as a source of nitrogen nutrition. As a result, the final product of the conversion of cyanides is removed and the process of microbiological purification is accelerated. Furthermore, blue-green alga during the life of ^carbon-10 is isolated containing compounds that microorganisms are used simultaneously, which leads to elimination of the need of making additional carbon additives for intensification zhiznedeyatele 15 • NOSTA microorganisms involved in the destruction of cyanides.

'Krme of algae throughout his life isolated kis- ₂ of rocks and thus aerated sewage.

The method is as follows.

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In order to ensure the vital activity of microorganisms, phosphorus in the form of one- or double-substituted potassium phosphate is previously introduced into the solution. Then a complex of microorganisms in the form of a soil extract is introduced into water in a suspension of blue-green algae ΗαραβΟδιίοη £ oi о ηα in an amount of 15 ml.

on 1 l. As cultures of microorganisms, soil microorganisms Vasiergip Sa6p5, YYB- ^{35 are used.}

γϊοϊγ osgiop, 6a, гemv, ReeshaNia№οηαβ · ϊβυορβδρβηβ.

Example. Clean 1 l of a solution containing cyanide pH 7.3. Potassium phosphate monosubstituted in the amount of 1OO mg / l is injected into the solution, after which soil extract is introduced in the min ’· [roorganism in the amount of 1 ml per 1. l

solution in suspension of blue-green algae Narts ^ o51 £ ίυ ίοιΗηα & Ιε in the amount of 15 ml / l, which is 270 mg / l, calculated on the dry weight.

Under the action of soil microorganisms, the complete destruction of cyanides occurs after 6 days. At the same time, the solution is also enriched with oxygen up to 6-8 mg / l. The joint cultivation of microorganisms and blue-green algae in the optimal amount intensifies their destruction without the addition of carbon-containing substances. There is no need for dosing of nitriles into the water and artificial aeration of water, which simplifies the method.

The proposed method allows cleaning from cyanide to sanitary standards.

Claims (2)

Claim 1. The method of purification of wastewater from cyanides by microorganisms, characterized in that, in order to simplify the process, soil microorganisms are used as microorganisms and cleaning is carried out in the presence of blue-green algae ^ αροΫΟδ’ιίον 2. The way pop. 1, that is, that blue-green algae are introduced into the water in an amount of 40-50 mg per 1 g of cyanide.