Method for spraying and desalting through residual pressure of reverse osmosis concentrated water

The technology of reverse osmosis concentrated water and reverse osmosis device is applied in the concentrated water purification of reverse osmosis system and the field of reverse osmosis concentrated water residual pressure spray desalination, which can solve the problems of increasing water production cost and wasting energy.

Inactive Publication Date: 2010-05-26
TIANJIN ACADEMY OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there is no effective way to deal with the concentrated water problem at present, the cost of water production during the treatment of the reverse osmosis device is increased, and a large amount of energy is wasted at the same time. The environmental pollution of concentrated brine is still a difficult problem that cannot be effectively solved.

Method used

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  • Method for spraying and desalting through residual pressure of reverse osmosis concentrated water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1) Waste water is separated into concentrated water by reverse osmosis device (1) under high pressure; the air source (which can be air and low-grade hot steam) enters the temperature control heater (5) from the blower (6), which is based on The actual conditions such as the amount and temperature of the concentrated water needed to evaporate, so that the inflow gas is controlled at the normal operating temperature (50~90℃), and enters the atomization concentration chamber by the suction effect of the induced draft fan (7);

[0050] 2) The concentrated water is preheated by the heat exchange system (2). The heat exchange system (2) mainly exchanges heat between the atomized water vapor, the concentrated tail water and the reverse osmosis concentrated water, and the water vapor, The heat in the concentrated tail water is transferred to the reverse osmosis concentrated water. Among them, the heat exchange between steam and concentrated water is carried out by an in-line stea...

Embodiment 2

[0057] 1) Waste water is separated into desalinated refined water and waste concentrated brine (concentrated water) through reverse osmosis device under high pressure of 2.5MPa;

[0058] 2) After the concentrated water is preheated by the heat exchange system (2) (40°C), it enters the atomization concentration chamber (4) directly through the mixing exchanger (3), and uses the energy of the concentrated water to pass through the improved pressure rotary atomization Device

[0059] 3) The atomized concentrated water droplets are contacted with the hot air stream treated by the temperature-controlled heating system (90°C) to form water vapor and prepare concentrated tail water;

[0060] 4) The induced draft fan (7) takes the water vapor and air flow out of the evaporation chamber and enters the gas-powder separator (8) to remove the salty substance powder entrained in the air, and then condense it into fresh water by the condensate collector (9). Be recycled

[0061] 5) After concentra...

Embodiment 3

[0064] 1) Waste water is separated into desalinated refined water and waste concentrated brine (concentrated water) through reverse osmosis device (1) under high pressure of 7MPa;

[0065] 2) After the concentrated water is preheated by the heat exchange system (2) (40°C), it enters the atomization concentration chamber (4) directly through the mixing exchanger (3), and uses the energy of the concentrated water to pass through the improved pressure rotary atomization Device

[0066] 3) The atomized concentrated water droplets are contacted with the dry hot air stream treated by the temperature control heating system (90°C) to form water vapor and prepare concentrated tail water;

[0067] 4) The water vapor and air flow are taken out of the evaporation chamber by the induced draft fan (7) into the gas-powder separator (8) to remove the salt and powder entrained in the air, and then condensed into fresh water by the condensate collector (9) And be recycled;

[0068] 5) After concentrat...

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Abstract

The invention establishes a method for treating waste concentrated saltwater of reverse osmosis systems. The method mainly comprises the following steps that: the residual pressure of concentrated water produced by the self of a reverse osmosis system during water production is utilized to form high-salt spray so as to save power needed by conventional atomization; tiny water droplets quickly evaporate in floating air so as to separate water, salt and other impurities; meanwhile, organic matter contained by the water is oxidized to be carbon dioxide; vapor is input into a condensing chamber to turn into pure water, while salt and high-power tail water fall to the bottom of a separation chamber; the tail water and initial inflow water are mixed and circulated and then continue to be atomized and concentrated to a saturation state; the contained salt is subjected to heat-exchange condensation and then crystallization and precipitation; and water purification and salinity removal of reverse osmosis concentrated water are finally realized. The desalting and pollutant-reducing method for reverse osmosis concentrated water is suitable for the separation of the waste concentrated saltwater produced by every type of reverse osmosis systems.

Description

Technical field [0001] The invention belongs to the technical field of water treatment, and relates to the purification of concentrated water of reverse osmosis systems in the fields of industrial water treatment, environmental pollution control, sea water and brackish salt water desalination. More specifically, it is a spray desalination method of reverse osmosis concentrated water residual pressure. Background technique [0002] The reverse osmosis technology uses external force (to overcome the osmotic pressure) and with the help of the selective retention effect of the membrane to separate the solute in the solution from the solvent, so as to achieve the purpose of pure water quality. This technology has been widely used in industrial water treatment, environmental pollution control, seawater and brackish salt water desalination, etc. However, in the process of treatment, affected by factors such as membrane material and water quality, the production of desalinated water is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/44C02F1/12
CPCY02A20/124Y02A20/131Y02W10/37
Inventor 许丹宇唐运平张志扬石岩张维刘红磊袁敏
Owner TIANJIN ACADEMY OF ENVIRONMENTAL SCI
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