RU2513904C1 - Method of producing ultra-clean water and device to this end - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to production of ultra-clean water for analytical and lab analyses and can be used at research centres, enterprises of medical, radio, electronic and pharmaceutical industries. Proposed method consists in multistage cleaning by preliminary mechanical filtration, sorption, processing by reverse osmosis, distillation and electric deionisation. Proposed device comprises mechanical pre-filter, sorption coal filter, booster pump, reverse-osmosis membrane, distiller with control device and accumulation tank with control device, second pump communicated with said accumulation tank and electric deioniser connected via pipe with atmospheric tank. Pressure gage with solenoid valve is arranged downstream of said second pump.

EFFECT: higher quality of filtration to 1^st degree.

3 cl, 5 dwg

Description

The invention relates to methods and devices for producing particularly pure water for analytical, laboratory analysis and can be used in scientific institutions, at enterprises: medical, radio engineering, electronic, pharmaceutical industries.

The known method of water purification according to US patent No. 4808287 of 12/21/87 is implemented according to the scheme shown in Figure 1. The method of obtaining highly pure water according to the USSR copyright certificate No. 1542920 is implemented according to the scheme shown in Figure 2.

There is a known method of producing pure water according to US patent No. 4876014, according to which, before processing the water, a stable flow is preliminarily created using pumps, and then it is sequentially treated with sorption on granular activated carbon, which makes up 5-10% of the cleaning time, then 40-80% of the time anionization is carried out, and 20-60% cationization. In this case, the filter is cleaned by creating a reversible turbulent flow of water. Next, the water is treated with bacteria that perform the functions of biosorption and destruction of microorganisms, viruses and pathogens and ultraviolet radiation. The water treatment scheme for this method is shown in Figure 3.

There is another method and device for producing particularly pure water - patent RU 2073359. Unfortunately, complex in the technological chain, it did not find wide application.

The most common devices for water purification III and II degrees.

We will only consider a method and device for producing pure water of degree I, the source of water for which is water of degree II. The closest in technical essence is the method according to US patent No. 4808287, in which drinking water is first filtered on a 1-5 micron filter, then activated carbon, then on a protective filter with activated carbon, then filtered again on a 1-5 micron protective filter . Perform primary and then secondary treatment of water under pressure with reverse osmosis, treat water with electrodialysis on a platinum anode and cathode, or deionize water on ion exchangers and sterilize it with ultraviolet radiation. However, the water obtained in this way has a low electrical resistivity of 16 mOhm · cm, which characterizes the presence of a significant amount of salts in it. Its electrical conductivity is 0.0625 μS / cm.

Particularly pure water of degree I according to GOST R 52501-2005 and according to the European standard ISO 3696-1987 allows the presence of salts in water, its electrical resistance reaches about 18 mOhm / cm, which is 0.055 μS · cm in electrical conductivity.

A method for producing purified water according to the scheme in Figure 4 is proposed.

The initial tap water is sequentially filtered by mechanical treatment, sorption, reverse osmosis, distillation, the amount of salts is reduced, microbes and viruses are destroyed by heat treatment. After the distiller, water is pumped through the storage tank to the electrodeionizer, from which especially pure water of degree I comes out.

The purpose of the present invention is to improve the quality of water filtration, by mastering a new method and installation, providing purified water of degree I. To achieve this goal, we use, as in European Standard ISO 3696-1987, source water of degree II.

Based on the utility model No. 102610 with a priority of September 22, 2010, which contains mechanical filtration, sorption, reverse osmosis treatment and distillation.

The technical solution is ensured by the fact that the obtained water of degree II after distillation (Figure 4) enters the storage tank, then it is pumped to the electrodeionizer, after which very pure water (degree I) enters a special atmospheric tank with a breathing valve that protects the water from the external environment .

Figure 5 shows a device that implements a method for producing highly pure water.

The operation of the device for producing particularly pure water is as follows. Water from the water main through the low pressure sensor 1, the solenoid valve 2, the valve for adjusting the water supply 3, where the water pressure is controlled by a pressure gauge 4, passes sequentially a mechanical prefilter 5, a sorption carbon filter 6, a mechanical carbon filter 7, through a boost pump 8 enters the reverse osmosis membrane 9, the next movement of water through the high pressure sensor 11, where the pressure is controlled by a manometer 10, valve 12, enters the equalizer 13 of the distiller 15. In the distiller there is a tap water 14. Then, cooling water in the cooler 16, through the control system 17, 18 enters the tank 19, where type II water accumulates (grade II), then by the pump 20, where the pressure is controlled by the pressure gauge 21, enters through the valve 22 into the electrodeionizer 23 and then into the atmospheric container 25. The degree of purity of the water is monitored by the sensor 24.

The proposed method using the above method, purified water is obtained with an electrical resistance of 18 mOhm / cm or a specific conductivity of 0.054 μS / cm. The degree of purification of the filtrate according to test protocol 99.99988% by weight.

Explanations for Figure 5:

1 - low pressure sensor; 2 - solenoid valve, 3 - water flow control valve, 4 - pressure gauge, 5 - mechanical prefilter, 6 - carbon prefilter, 7 - mechanical carbon prefilter, 8 - boost pump, 9 - reverse osmosis membrane, 10 - pressure gauge, 11 - high sensor pressure, 12 - valve for adjusting the water supply to the evaporator; 13 - equalizer with level sensor, 14 - water drain valve from the evaporator, 15 - distiller, 16 - cooler, 17 - resistance sensor, 18 - three-way valve, 19 - type II water tank, 20 - pump, 21 - pressure gauge, 22 - electromagnetic valve, 23 - electrodeionizer, 24 - resistance sensor, 25 - atmospheric tank with water of the 1st degree of purification.

Information sources

1. US patent No. 4808287 from 12.21.87.

2. USSR Copyright Certificate No. 1542920.

3. Patent 2073359 RU dated 02.10.1997.

4. US Patent No. 4876014.

5. The utility model, patent No. 102610 from 09/22/2010.

6. Figures 1, 2, 3, 4, 5.

Claims (3)

1. A method of obtaining particularly pure water, which consists in sequential multi-stage purification by preliminary mechanical filtration, sorption, reverse osmosis treatment, distillation, electrodeionization. 2. A device for implementing the method of producing highly pure water, comprising a mechanical prefilter, a sorption carbon filter, a boosting pump, a reverse osmosis membrane, a distiller with a control device and a storage tank with a control device, characterized by the presence of a second pump connected in series to the storage tank, and the second one the pump is connected in series with an electrodeionizer, which is connected by an outlet fitting to an atmospheric tank. 3. The device according to claim 2, characterized in that after the second pump in front of the electrodeionizer there is a manometer with an electromagnetic valve.

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