Water disinfection method

FIELD: chemistry.

SUBSTANCE: invention relates to complex water treatment with a sodium persulphate oxidising agent and heavy metal ions, particularly silver, copper and zinc, and can be used to disinfect recycled pool water and post-treatment of industrial waste water. The water disinfection method includes treating said water with an oxidising agent and copper and silver ions obtained by dissolving salts thereof, after which the water is held for 0.5-2 hours. Zinc ions are optionally used. The oxidising agent used is 0.2-0.4% aqueous sodium persulphate solution, which is added to the water simultaneously with copper, silver and zinc salt solutions until achieving the following concentrations thereof in the water: sodium persulphate 1-5 mg/l; silver ions 0.02-0.05 mg/l; copper ions 0.07-1.0 mg/l; zinc ions 3.0-5.0 mg/l. Water treatment is carried out at 10-25°C.

EFFECT: invention provides water disinfection and prevents repeated bacterial infection of the water for a long period of time.

1 tbl, 3 ex

 

The present invention relates to methods of complex water treatment oxidant by persulfate sodium ions and heavy metals, in particular silver, copper, zinc. It can be used for disinfection and disinfection of circulating water pools and for purification of waste water plants.

The most common method of water disinfection is chlorination [frog B.N., Levchenko A.P. Water. M.: Publishing house of Moscow state University, 2003. 680 C.]. To enhance the antimicrobial action chlorination combined with other reagents, such as ions of copper, silver or zinc (US 5858246, C02F 1/50, 1999). However, this method has several limitations related to the deterioration of water taste, odor and the formation of significant amounts of by-products containing chlorine, some of which are carcinogenic.

More promising is the replacement of chlorination water ozonation, which is due primarily to its high oxidizing properties and the ability to effectively destroy various inorganic and organic compounds, and pathogens, including those resistant to other oxidants, such as chlorine. When water ozonization her disappear unpleasant taste and odor, increased transparency, and increased dissolved oxygen. R is sloanie residual ozone occurs rapidly with oxygen without the formation of toxic compounds.

However, along with the above mentioned advantages of the method, treatment with ozone has a significant drawback - the water may be subjected to secondary bacterial infection, because just two hours after treatment the concentration of ozone in it approaches zero, and the need for the production of ozone in water treatment station.

The known method of water disinfection in swimming pools, providing periodic processing diisodecyl-dimethylammonium chloride and copper ions obtained by dissolving salts, followed by the introduction of the oxidant is chlorine or ozone and maintain a constant concentration of the latter is not less than 0.1 mg/l (US 5332511, C02F 1/50, 1994).

The known method of water disinfection by treatment with ozone and ions of copper, and the treatment is carried out in several stages, the first stage in water is injected ozone to its concentration in water of 0.5-1 mg/l in the second stage, the ozonated water was incubated for 0.5-2 h, and then in the third stage, the water is treated with copper ions at a concentration of 0.05-0.8 mg/l, obtained using the electrolytic cell, the anode and cathode which is made of refined copper, and the polarity of the electrodes is changed in 5-10 min (U.S. Pat. 2182123 RF, MKI C02F 1/50).

The known method of water disinfection, including its handling of ozone and ions of silver, and the processing of the Vedas is t in several stages, at the first stage, water is injected ozone to its concentration in water of 0.5-1.0 mg/l in the second stage, the ozonated water was incubated for 0.5 to 2.0 hours, then in the third stage, the water is treated with silver ions at a concentration of 0.005-0.01 mg/l, obtained using the electrolytic cell, the anode and cathode of which contain not less than 99 wt.% silver, and the polarity of the electrodes periodically change. Preferably ozonation need to at a water temperature of 10-20°C, and the electrolysis is at 20-30°C and pH 6,5-8,5 (U.S. Pat. 2182124 RF, MKI C02P 1/50, 1/78).

Known the closest in technical essence is the method of water disinfection, including its processing oxidant, followed by the introduction of silver ions and copper obtained by dissolving their salts, and as oxidant use ozone, which is injected into the water in an amount of 0.5-1 mg/l, then the water was incubated for 0.5-2 h and using at least one dosing device, introduce a solution of silver salts to achieve concentrations of ions Ag+in water, equal to 0.005-0.01 mg/l, and then injected with a salt solution of copper until concentrations of Cu2+equal to 0.05-0.5 mg/l (U.S. Pat. 2182125 RF, MKI C02F 1/50).

The disadvantage of this method is the need for the production of ozone in water treatment stations, and since already two hours after treatment the concentration of ozone in not what approaches zero, the water may be subjected to secondary bacterial infection.

The problem to which the invention is directed, is to develop effective, environmentally safe and cost-cheap method of water disinfection with simultaneous oligodynamic treatment metal ions and oxidizing agent to ensure the disinfection of water and to prevent secondary bacterial contamination of water in a long time.

This is achieved in that in the method of water disinfection, including the processing of silver ions and copper obtained by dissolving salts, after which the water stand for 0.5-2 hours, according to the invention are additionally applied zinc ions, and as the oxidant used is 0.2-0.4% aqueous solution of sodium persulfate, which is injected simultaneously with solutions of salts of silver, copper and zinc to achieve their concentration in water: sodium persulfate 1-5 mg/l; silver ion 0,02-0,05, copper ion 0.07 to 1.0 and zinc ions 3,0-5,0 mg/l, while water treatment is carried out at a temperature of 10-25°C.

The method is as follows.

First prepare aqueous solutions of sodium persulfate (0.2-0.4% of the solution), silver nitrate and copper sulfate and zinc (2-5% solution).

Then disinfected water is simultaneously added with stirring a solution p is sulfate sodium to its concentration of 1-5 mg/l, silver nitrate and copper sulfate and zinc to a concentration of silver ions, copper and zinc to 0.02-0.05, 0.07 to 1.0, and 3.0 to 5.0 mg/l, respectively.

Then disinfected water was incubated for 0.5-2 hours at a temperature of 10-25°C.

Example 1. To test the bactericidal action of this method was processed water from a surface water source. In the source water was added 0.2% solution of sodium persulfate to its concentration of 1 mg/l and 2% solutions of silver nitrate and sulphate of copper and zinc to a concentration of silver ions, copper and zinc 0,02; 0,07 and 3.0 mg/l, respectively.

In the second stage, the treated water stand for a 2.0 hours at a temperature of 25°C.

Example 2. To test the bactericidal action of this method was processed water from a surface water source. In the source water was added 0.3% solution of sodium persulfate to its concentration of 3 mg/l and 3% solutions of silver nitrate and sulphate of copper and zinc to a concentration of silver ions, copper and zinc 0,03; 0.5 and 4.0 mg/l, respectively.

In the second stage, the treated water was incubated for 1.0 hour at a temperature of 15°C.

Example 3. To test the bactericidal action of this method was processed water from a surface water source. In the source water were added to a 0.4% solution of sodium persulfate to e what about the concentration of 5 mg/l and 4% solutions of silver nitrate and sulphate of copper and zinc to a concentration of silver ions, copper and zinc of 0.05, 1.0 and 5.0 mg/l, respectively.

In the second stage, the treated water was incubated for 0.5 hour at a temperature of 10°C.

The study was conducted in the research laboratory of the centre FBUZ "Center of hygiene and epidemiology in the Penza region".

The table below lists the water quality parameters before and after 0.5; 1; 2 hours and 30 days after it is processed by the proposed method.

Thermotolerant coliforms, CFU 100 ml: 2,6·103
Date samplePlace sampleThe amount of the reagentContaminants to cleanupWater temperature, °CContaminants after cleaning
After 0.5 hoursAfter 1 hour2 hoursAfter 30 days, open storage
3.07.2012The Sura riverNa2S2O8up to a concentration of 1 mg/l, [Ag+] to a concentration of 0.02 mg/l, [Cu+2] to a concentration of 0.07 mg/l, [Zn+2] to a concentration of 3.0 mg/l251NoNo
Total coliforms, CFU 100 ml: 2,6·103251NoNo
20.12.2013Na2S2O8to a concentration of 3 mg/l, [Ag+] to a concentration of 0.03 mg/l [Cu+2] to a concentration of 0.5 mg/l, [Zn+2] to a concentration of 4.0 mg/lThermotolerant coliforms, CFU 100 ml: 3,2·10315NoNo
Total coliforms, CFU 100 ml: 3,2·10315NoNo
20.12.2013Na2S2O8to the concentration of the emission of 5 mg/l, [Ag+] to a concentration of 0.05 mg/l [Cu+2] to a concentration of 1.0 mg/l, [Zn+2] to a concentration of 5.0 mg/lThermotolerant coliforms, CFU 100 ml: 3,2·10310NoNo
Total coliforms, CFU 100 ml: 3,2·10310NoNo

As can be seen from the table in the source water were found thermotolerant coliform bacteria CFU and total coliform bacteria CFU. After treatment by the proposed method content thermotolerant coliforms (CFU 100 ml) and total coliforms (CFU per 100 ml), considerably lower than the existing EQS for water supply respectively ≤100 ≤500 [SanPiN 2.1.5.980-00 Hygienic requirements for the protection of surface waters] and meet the requirements for water of centralized drinking water supply systems [SanPiN 2.1.4.1074-01 "Drinking water. Hygienic requirements to water quality of centralized drinking water supply systems. QC] and DL the water of swimming pools ["Swimming pools. Hygienic requirements for design, operation and water quality. The quality control. SanPiN 2.1.2.1188-03"].

The table also shows that in the disinfected water at open storage for one month is not its secondary bacterial infection.

Thus, the data presented indicate the high quality of the treated water is conducted this way, and the proposed method of water disinfection is an effective, relatively simple and available.

The method of water disinfection, including its handling of oxidizing agent and copper ions and silver obtained by dissolving salts, after which the water was incubated for 0.5-2 hours, characterized in that it further apply zinc ions, and as the oxidant used is 0.2-0.4% aqueous solution of sodium persulfate, which is injected into the water simultaneously with solutions of salts of copper, silver and zinc to achieve their concentrations in water:
sodium persulfate 1-5 mg/l;
silver ions to 0.02-0.05 mg/l;
copper ion 0.07 to 1.0 mg/l;
zinc ions 3,0-5,0 mg/l,
the water treatment is carried out at a temperature of 10-25°C.



 

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