Method and device for control and limitation of contamination with microorganisms in contours of moistening substances

FIELD: ecology.

SUBSTANCE: invention is related to technology of reduction of contamination of contours with water mediums by microorganisms. Method and device aimed at reduction of contamination of contours with water mediums by microorganisms includes stage of electrochemical processing of water medium, besides mentioned contour represents contour of moistening substance, moreover, specified electrochemical treatment is carried out by application of voltage to at least two electrodes, besides mentioned voltage is AC voltage with range from 5 to 50 Volt.

EFFECT: makes it possible to reduce number of microorganisms with the available contamination, and also to prevent their growth.

24 cl, 2 dwg

 

The present invention relates to a method and apparatus for controlling and limiting contamination by microorganisms in the contours of moisturizers and other aquatic environments, in particular in the field of printing.

Moisturizer (moisturising solution) is used to maintain the hydrophilic hydrophilic areas of the printing plates on the areas that should not accept printing ink.

Hydrating solution with moisturizing apparatus directly or indirectly applied to the printing plate while the printing ink captures a limited amount of moisturizer and emulsifies. Fountain solution contains components that support hydrophilic napechatala areas of the printing plate, thus preventing the adoption of printing ink in this field.

It finds application in particular in the way of flat printing, in which printing and napechatala areas of the printing form lie almost in one plane. These printing methods are based on the opposite of the physico-chemical properties of certain substances in the coating printing plates, which are receiving paint or repulsive paint.

In offset printing, there is a thin printing plate (e.g., aluminum)on the surface of which are receiving PE atnow paint (lipophilic) image areas and white (hydrophilic) parts.

Printing machine spends in the order of magnitude between 10 and 150 liters of the fountain solution per hour. This fountain solution is usually used slightly chilled.

Moisturizer usually contains, in addition to water, regulating the pH of a substance (buffers), preservatives (e.g., biocides, corrosion inhibitors, components for protection plates, and, if necessary, a wetting. These components are usually in concentrate moisturizer and then diluted with water to a predetermined concentration. Ready-to-use moisturizer injected into a closed loop. Separate moisturizing apparatus of the printing machine are connected through the circulation piping installation supply moisturizer.

On the supply pipe moisturizer serves to moisturizing apparatus. On the recirculation pipeline of excess contaminated paint particles and paper moisturizer flows back into the treatment plant. Depending on the design of the facility returning moisturizer clear of contaminants through the filter material or filter bags made of synthetic fibers before it enters the receiving tank installation. In these devices refining moisturizer is also usually the cooling unit, the use of which the temperature moisturizer is kept at a predetermined value, which is usually in the range from 9 to 15°C.

During the printing process moisturizer constantly consumed and replenished by adding fresh moisturizer. Despite the cooling and filtering, again and again comes to the fact that greatly increases the load of microorganisms in the contour moisturizer. Contaminating particles from the printing process, in particular cellulose from paper top layer, but also used buffers provide favorable growth conditions for microorganisms.

The formation of biofilms in pipes, filters, moisturizing apparatus and tank installation supply moisturizer. With increasing contamination by microorganisms buffer substances dissolved, and the pH value increases, which leads to negative consequences in the printing process, such as bad behavior at start-up, increased water consumption and unstable equilibrium paint is water.

Contamination by microorganisms in the circuit moisturizer is possible only to an insufficient extent be prevented by adding biocides; microorganisms inhibited by biocides only in respect of growth, but not wordplays. The choice and concentration of these products is limited because of the danger to health of workers in printing machines of staff

When excessive contamination by microorganisms contour moisturizer should be cleaned and rinsed strong alkaline solutions (e.g., in combination with hydrogen peroxide, hypochlorite, or other effective bactericides) the whole system within 5-8 hours. Such cleaning cycles are usually required every one to two months.

The problem of microbial contamination in the contours of moisturizer even sharper than are large printing machine and, in this regard, the circulation piping system. In General, the circulating high flow rate in the circuit volume moisturizer often is in the case of newspaper printing machines in the range from 200 to 500 liters, which have to be transported over long distances. Newspaper machines are particularly susceptible to contamination by microorganisms, since in this case the pipes have a larger diameter and therefore never completely filled moisturizer. Besides, adds even more increased penetration of paper dust, which consists mainly of cellulose.

Living free in solution bacteria are relatively vulnerable and controllable by biocides or antibiotics. But if you have already formed biofilms, they are significantly more stable. In biofilms bacteria stick to each other is whether to the substrate, they are surrounded by extracellular substances, which consist mainly of polysaccharides and proteins. This slideway layer very effectively protects the bacteria from external influences. Using a commercially available conventional biocides are not able to reliably deal with biofilms in piping systems of the fountain solution printing machines. If deposits of microorganisms in hydrating the system is already formed, they grow up very quickly on and can significantly interfere with printing production. Detached biofilms and agglomerates can be washed in the hydrating apparatus, where they clog filters, nozzles and valves. In the processing system moisturizer increased microbial growth becomes noticeable due to the rotten smell in the tanks for moisturizer. On the filter canvases recirculation line and the walls of the tank moisturizer forms a layer of mucus.

Therefore, the present invention was to develop a method and device with which it is possible to counteract germs contours moisturizer.

This problem is solved by using a method, which includes stage electrochemical machining moisturizer. According to the invention this can be accomplished by application of voltage between men is our least two electrodes in circuit with moisturizer.

This method is used to minimize the growth of microorganisms in the circuit moisturizer. Thus can also be inhibited or prevented the growth, and to achieve a reduction in the number of microorganisms in existing contamination by microorganisms.

First, you can use a constant voltage, so that the said at least two electrodes comprise an anode and a cathode. In a preferred embodiment of the invention, the tank installation refining moisturizer, which is usually made from stainless steel used as the cathode.

Alternative and preferably, the voltage may be an alternating voltage. Change polarity (reverse polarity) eliminates the appearance of cleavage products during electrolysis, as well as the formation of deposits on the electrode surfaces. Especially suitable as the AC voltage is the voltage of the rectangular form. The frequency of the alternating voltage is preferably in the range from 0.01 to 108Hz, more preferably in the range from 0.01 to 20,000 Hz, and most preferably from 0.05 to 10 Hz or 1 to 10 Hz.

When used as a DC voltage and an AC voltage, the voltage is mostly in the range from 2 to 50 Volts, preferably from 5 to 0 Volts, more preferably from 5 to 25 Volts, and most preferably from 5 to 20 Volts. Since very high voltages pose a danger to maintenance personnel, the preferred lower voltage level.

Referred to at least two electrodes can be installed in any convenient place on the circuit humectants, such as applying moisturizer in the circulation system, for example, built into the system piping or tank for moisturizer. Electrochemical processing moisturizer with electrodes also can be performed from an external device. In the bypass handle part of the moisturizers in this device and then return to the circuit. In principle, it is also possible to use more than two electrodes or two or more pairs of electrodes, which are located in different places.

Suitable materials for the electrodes can be selected from metals, semiconductors, conductive ceramics, graphite or conductive plastics. Particularly preferred materials for the electrodes are titanium, titanium alloys or titanium coated. Particularly preferred coating with platinum, iridium, indium, ruthenium oxide, indium oxide, iridium oxide, or mixtures thereof.

It is assumed that when Taco is processing the formed oxygen radicals, much stronger effect on biofilm than, for example, chlorine.

Control of microbial contamination involves preventing the growth and death of microorganisms.

There is also a lightening moisturizer. Becoming during turbid and colored moisturizer during processing becomes more clarified.

Processing can be performed continuously. However, it can also be interrupted by the day or by the hour. In particular, the operation can be adjusted depending on the growth of microorganisms.

The object of the invention is also a device for implementing the method, which includes the system moisturizer with at least two electrodes and a voltage source. System moisturizer includes hydrating apparatus, the circulation piping and installation supply moisturizer. This installation supply moisturizer includes a processing device moisturizer, cooling unit, the dispenser and the reservoir for moisturizer. Device processing moisturizer includes pumps for circulation and filtration devices.

In Fig. 1 schematically shows an embodiment of the device for electrochemical processing.

In Fig. 2 predictableuncertainty embodiment of the device for electrochemical processing.

The principle of operation of the system more explained in the following example. The design of the setup is as follows.

Required for this installation, the current is supplied via a transformer with a primary input voltage of the network 230-240 V and outputs an AC of 25, 12 and In the 6th Century, the Transformer has a power of 100 watts.

Output AC 25 through the bridge rectifier and then filtering electrolytic capacitor 2200 UF receive DC voltage from 28

In order to protect the installation against overloads and short circuits, the output current limit using a controlled voltage regulator, which is connected in series, a value of 1.5 A. If the overload voltage regulator heats up and automatically adjusts the current downward.

Output AC 12V through the bridge rectifier to receive the DC voltage of 14 V and stabilizes it by the built-in voltage regulator in the 10th Century, the Filtering is carried out using an electrolytic capacitor of 1000 µf.

This stable at 10 In the constant voltage zapityvat pulser.

Structural elements in the pulser configured so that a ratio of the interval, pulse is 1:1. The generator is a rectangular pulse is s is adjustable via a potentiometer in the range from 0.05 to 10 Hz.

The output of the pulser is connected relays. By means of two switching contacts continuously change the polarity of the DC voltage 28 (paragraph 2) depending on the frequency of the square wave pulser, which receives an alternating voltage of rectangular shape.

The relay output is connected to a submersible electrode. It consists of two titanium sheets with dimensions of 300 mm × 30 mm and a thickness of 3 mm Electrical terminals to protect the epoxy. The electrode plates are at a distance of 10 mm from each other.

Output AC 6 through the bridge rectifier to receive the DC voltage of 8 V and using the built-in voltage regulator stabilizes it in the 5th Century Filtering is carried out using an electrolytic capacitor of 1000 µf.

Stable 5 V constant voltage zapityvat digital display for current measurement.

The current measured by the voltage drop across a resistance of 1 Ohm, which is connected in series between the current limiter and the relay. The measuring range is from 0 to 1,999 mA.

In the control experiment, it was determined that when activated, the current first increases strongly, and then, after 1-2 hours, drops and stabilizes. Current strength is highly dependent on the conductivity moisturizing is the means. Preferably, the current is in the order of magnitude from 0.1 to 2, preferably from 0.1 to 0.6 A.

After two to four days from the piping and circulation system was intensively detached biofilms and other agglomerates mucus, and they were washed and collected in a drain on absorbent canvas. Then you could see how the day lightened moisturizing solution.

Load microorganisms was investigated using the so-called DIP-slides. Used slides "Envirocheck Contact MERCK, Darmstadt, Germany. When it comes to coated agar plates (casein peptone - peptone soya flour agar). Reverse DIP-slides contains the same floor with the addition of the neutralizer, which neutralized the effect of biocides in a moisturizing agent. DIP slides were incubated for three days at 36°C and then quantitatively evaluated.

The number of formed colonies (colony forming units) is a measure of the load of microorganisms moisturizer (CFU/ml). Investigated as strokes filter and smear moisturizer. Further studies were performed after 24 or 48 hours after the onset of electrochemical water treatment.

DIP-slideswithout electrochemical water treatmentwith electrochemical water treatment
after 24 hafter 48 h
Side 1, CFU/mlFilter106-107105103-104
Moisturizer106103-104102
Side 2, CFU/ml, with neutralizerFilter> 107105-106104
Moisturizer106-107104102-103

As can be seen, the load of microorganisms after 24 hours after treatment according to the invention is reduced by several decimal orders of magnitude and, thus, reaches a value that is non-critical in the circuit moisturizing races is the thief. The method according to the invention does not have any impact on the printing process and on the properties of the fountain solution, such as, for example, pH value and conductivity.

The method according to the invention is suitable not only for hydration, it is also suitable for the contours of the printing and cleaning flexographic printing.

Especially preferred is the use of the method according to the invention in water circuits, in which the ingress of organic substances, as they contribute to the growth of microorganisms.

"Aqueous medium" means that the water content is at least 50 wt.%, preferably at least 70 wt.%.

Another variant of realization of the invention is a method of reducing the contamination with microorganisms in aqueous media in the print area, which includes a stage for electrochemical treatment of water environment, as well as a way to reduce microbial contamination in ultrafiltration installations and osmotic installations, including stage electrochemical machining of the aquatic environment.

If these methods are used the same additional embodiments, which are described for a method of limiting contamination by microorganisms in the contours of moisturizers.

These additional methods are suitable, in castnet is, for the implementation in the field of printing.

The print area includes work in connection with the methods of letterpress printing, in particular flexographic printing, gravure printing, flat printing, in particular offset printing, screen printing, using printing machines, which automatically cause the printing inks and printing varnishes material for printing (paper, cardboard, cardboard paper, plastic, sheet metal and so on).

1. A method of reducing the microbial contamination contours with aquatic environments, including stage electrochemical machining of the aquatic environment, and the said circuit is a circuit moisturizers, these electrochemical treatment is carried out by applying a voltage to the at least two electrodes, and the above-mentioned voltage is an alternating voltage with a range from 5 to 50 C.

2. The method according to claim 1, in which the mentioned alternating voltage is a voltage of a rectangular shape, a sine wave or a voltage of a triangular shape.

3. The method according to claim 1, in which the frequency of the mentioned alternating voltage is in the range from 0.01 to 108Hz.

4. The method according to claim 1, in which the aforementioned at least two electrodes are provided in the supply of moisturizer in the circulation system Il is in bypass.

5. The method according to claim 1, wherein a material for the above-mentioned at least two electrodes independently selected from metals, semiconductors, conductive ceramics, graphite or conductive plastics.

6. The method according to claim 1, wherein a material for the above-mentioned at least two electrodes is independently selected from titanium, titanium alloys or titanium coated.

7. The method according to claim 6, where the above-mentioned coating titanium made with platinum, iridium, indium, ruthenium oxide, indium oxide, iridium oxide, or mixtures thereof.

8. A device for implementing the method according to any one of claims 1 to 7, which includes the system circulation, at least two electrodes and a power source, and said circulation system is a contour moisturizer, and the aforementioned power source is an AC voltage.

9. A method of reducing the microbial contamination of aquatic environments in the print area, which includes stage electrochemical machining of the aquatic environment, these electrochemical treatment is carried out by applying a voltage to the at least two electrodes, and the above-mentioned voltage is an alternating voltage with a range from 5 to 50 C.

10. The method according to claim 9, in which the mentioned alternating voltage is supragenerational form, sine wave or a voltage of a triangular shape.

11. The method according to claim 9, in which the frequency of the mentioned alternating voltage is in the range from 0.01 to 108Hz.

12. The method according to claim 9, in which the aforementioned at least two electrodes are provided in the supply of moisturizer in the circulation system or bypass.

13. The method according to claim 9, in which the material for the above-mentioned at least two electrodes independently selected from metals, semiconductors, conductive ceramics, graphite or conductive plastics.

14. The method according to claim 9, in which the material for the above-mentioned at least two electrodes is independently selected from titanium, titanium alloys or titanium coated.

15. The method according to 14, in which the said coating of titanium made with platinum, iridium, indium, ruthenium oxide, indium oxide, iridium oxide, or mixtures thereof.

16. The method according to claim 9, in which the mentioned water environments in the print area are the water in the storage tanks automatic washing blankets and rollers, the water in the storage tanks osmotic installations and aqueous solutions in manifestations of copies.

17. The way to reduce microbial contamination in ultrafiltration installations and osmotic plants used in the field of printing, including the stage itself electrochemical treatment of water environment, these electrochemical treatment is carried out by applying a voltage to the at least two electrodes, and the above-mentioned voltage is an alternating voltage with a range from 5 to 50 C.

18. The method according to 17, in which the mentioned alternating voltage is a voltage of a rectangular shape, a sine wave or a voltage of a triangular shape.

19. The method according to 17, in which the frequency of the mentioned alternating voltage is in the range from 0.01 to 108Hz.

20. The method according to 17, in which the aforementioned at least two electrodes are provided in the supply of moisturizer in the circulation system or bypass.

21. The method according to 17, in which the material for the above-mentioned at least two electrodes independently selected from metals, semiconductors, conductive ceramics, graphite or conductive plastics.

22. The method according to 17, in which the material for the above-mentioned at least two electrodes is independently selected from titanium, titanium alloys or titanium coated.

23. The method according to item 22, in which the said coating of titanium made with platinum, iridium, indium, ruthenium oxide, indium oxide, iridium oxide, or mixtures thereof.

24. The method according to 17, in which the aforementioned aqueous medium in the print area are the water in the storage tanks auto is oticheskih installations washing blankets and cushions, the water in the storage tanks osmotic installations and aqueous solutions in manifestations of copies.



 

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6 dwg

FIELD: water-supply engineering.

SUBSTANCE: invention relates to methods of removing hardness salts from regenerates and can be used in water treatment processes in heat-and-power engineering, chemical, petrochemical, food, and other industries provided with ion-exchange water-desalting filters. Method is accomplished by precipitation of hardness salts involving recycle of precipitate treated by alkali solution followed by passage of supernatant through H-cationite filter. Treated precipitate accumulated in preceding settling cycles is recycled into regenerate and settling-subjected solution is passed through cationite filter to produce purified sulfuric acid further used for regeneration of H-cationite filters in water-treatment cycle. Precipitate is treated with alkaline regenerate from OH-anionite filters or with alkali solution obtained from electrolysis of regenerates with pH not below 11. Amount of regenerate introduced into accumulator-settler should be at least 20 kg/m3.

EFFECT: excluded liming procedure, preserved initial (after regeneration of filters) content of sulfate ions in sulfuric acid, reduced consumption thereof during preparation of regeneration solution, and excluded discharge of sulfate ions unto water objects.

3 cl, 2 ex

FIELD: petrochemical and food and other processing industries.

SUBSTANCE: the invention presents a device for purification of sewage and is dealt with designs of sewage treatment plants for purification and averaging of consumption and composition of sewage and may be used for preliminary purification of sewage of the enterprises of processing industries from floating and settling insoluble impurities. The device contains a cylindrical body with a cone-shaped bottomed, a mounted along the axis of the body cylindrical partition, a located above the body reactive water distributor with branch-pipes, a floating device, a rotating rocker arm with a foam pushing plates mounted with the help of a half-coupling to the reactive water distributor at a maximum level of water in the device, a collecting tank mounted with possibility of delivery in it of the circulating water, a pump, a pressure tank-saturator linked by a pressure pipeline with the reactive water distributor. Inside the body there is a ring-type chute, in which the reactive water distributor branch-pipes supplied with diffusers on their ends are placed. The technical result is an increase of efficiency of sewage purification and realization of averaging of consumption and composition of sewage and its purification simultaneously.

EFFECT: the invention ensures increased efficiency of sewage purification and simultaneous realization of averaging of sewage consumption, composition and purification.

1 dwg

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