The method of disinfection of domestic wastewater

 

(57) Abstract:

The invention relates to the treatment of domestic wastewater and can be used for bacterial treatment at wastewater treatment plants municipal sewage systems and on local treatment facilities of enterprises. For disinfection use ammonia-amino acid complexes of copper (II) if consumption 1-3,5 mol/l of treated water. At this rate colindex reduced to 0-8102and non-pathogenic microflora is almost not affected. The introduction of the reagent does not change the biocenosis of water abstraction. table 1.

The invention relates to the field of treatment of domestic wastewater and can be used for bacterial treatment of sewage at treatment facilities in the sewers.

Antibacterial treatment of wastewater is carried out with the purpose of disinfection before discharge from treatment plants into natural water bodies. Most methods bacterial treatment of domestic wastewater based on the action of water containing pathogens, special reagents.

Now for disinfecting wastewater handling is liquefied earney standards for example, to the value of colindex 1103(Anokhin I. I. Modern methods of decontamination water and sewage. - M.: Stroiizdat, 1977). Chlorine is a poisonous substance. When handling chlorine together with pathogenic micro organisms are destroyed hidrofor responsible for the biocenosis of reservoirs, formation of toxic organochlorine compounds and are harmful substances into the atmosphere.

There is a method of disinfection of wastewater by treatment with solutions containing sodium hypochlorite or ammonium persulfate (Ed. mon. THE USSR 1553133, A 61 L 11/00, 1990). This is achieved by a deodorization, sterilization and clarification of wastewater. But after treatment there is no useful microflora. In addition, these toxic chemicals - second and third class of danger.

The closest in technical essence and the achieved result is a method of disinfecting wastewater treatment their solutions of organic substances, such as sodium carboxymethyl cellulose or polyvinyl alcohol (Veh. mon. THE USSR 1395330, A 61 L 11/00, 1988). When this is achieved the cleanup from the known method neistiraemosti microflora.

The disadvantage is the lack of efficiency of disinfection (maintain the ation of water after treatment).

The positive effect, which is achieved by the use of the invention is a broad spectrum antimicrobial action, the preservation of beneficial microflora in suppressing pathogenic to the requirements of sanitary norms, the acceleration process.

This effect is achieved in that in the method of disinfection of domestic wastewater, including the processing reagent, according to the invention as a reagent use ammonia-amino acid complexes of copper (II) and the processing is carried out at a flow rate of the reagent 1,0-3,510-5mol/l wastewater.

The essence of the reagents is that the copper complex binds groups of the protein sheath cells of bacteria, blocking the sites that are responsible for metabolic processes, as a result of violations which the bacteria are killed.

Example.

A solution of ammonium-glycinate complex of copper (II) with a concentration of 1.0 mol/l dosed into the container with the waste water after biological treatment in an amount of from 110-5to 3,510-5mol/l wastewater. The treatment is carried out for one hour, then check the completeness of decontamination. As ammonia and amino acid complex of copper (II) can be ispolzovanie degree of disinfection of wastewater after biological treatment in a typical sewage treatment facilities, containing pathogens, expressed in units of colindex, the dose of various ammonia-amino acid complexes of copper in the table.

As can be seen from the table, almost complete wastewater from pathogenic organisms: E. coli, streptococci, micrococci, diplococci, Staphylococcus, Enterococcus, Escherichia amoeba, Trichomonas, Trichomonas, disputes Becreus, because their number is less sanitary norms, which corresponds to the value of colindex 1103.

The proposed copper complexes have been tested for toxicity according to GOST 12.007-76. The values of the median lethal dose LD(50) is equal to 12.5-14.5 g/kg (in terms of 100% maintenance of the complex). Introduction complexes in doses up to 11 g/kg does not cause changes in the internal organs and hematological indices do not differ from the norm. Ammonium-amino acid complexes of copper belong to the fourth class of risk - low hazardous substances.

Ammonium-amino acid complexes of copper in the doses required to suppress pathogenic microorganisms in the conditions are mild (weak) toxic effects on non-pathogenic microflora. The main representatives of non-pathogenic microflora, as a rule, Sonia by treating ammonium-amino acid complexes for discharge into the natural water bodies do not violate natural biocenosis, no adverse action on the environment.

The method of disinfection of domestic wastewater, including the processing reagent, wherein the reagent is used as the ammonia-amino acid complexes of copper (II), and the treatment is carried out at a flow rate of reagent 1,0 - 3,5 10-5mol/l wastewater.

 

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