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A wastewater desalination process with a high water yielding rate and a device thereof

A wastewater and process technology, applied in general water supply conservation, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as low water production rate, secondary pollution electrodialysis, and difficulty in adapting to wastewater treatment. , to achieve the effect of improving membrane life and high water production rate

Active Publication Date: 2013-09-11
BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low water production rate, secondary pollution and difficulty in adapting to wastewater treatment in electrodialysis in the existing desalination method of reverse osmosis, the present invention proposes a waste water desalination process and device with high water production rate

Method used

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  • A wastewater desalination process with a high water yielding rate and a device thereof

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Experimental program
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Effect test

Embodiment 1

[0027] The object of advanced treatment is coking wastewater after biological treatment, and the TDS (total dissolved solids) in the wastewater is about 1000mg / L.

[0028] Wastewater 10 first enters the sand filter 1 for filtration, then enters the submerged ultrafiltration tank 2, the ultrafiltration filtration accuracy is 0.1 micron, and then enters the forward osmosis unit 3; the draw solution of the forward osmosis unit 3 adopts 30g / L chlorinated Sodium solution, after passing through the forward osmosis unit 3, the wastewater is concentrated to about 10g / L, the concentration factor is 10 times, the water production rate is 90%, the concentrated wastewater 11 is discharged or disposed of; the diluted sodium chloride solution After entering the subsequent electrodialysis unit 4 for concentration, the concentrated sodium chloride solution 12 reaching 30 g / L is returned to the forward osmosis unit 3 as a drawing solution, and the obtained pure water 13 is reused at the same ti...

Embodiment 2

[0030] The object of advanced treatment is urban wastewater after biological treatment, and the TDS (total dissolved solids) in the wastewater is about 500mg / L.

[0031] Wastewater 10 first enters sand filter 1 for filtration, then enters submerged ultrafiltration tank 2, the ultrafiltration filtration accuracy is 0.1 micron, and then enters forward osmosis unit 3; the draw solution of forward osmosis unit 3 adopts 8g / L chlorinated Sodium solution, after passing through the forward osmosis unit 3, the wastewater is concentrated to about 6g / L, the concentration factor is 12 times, and the water production rate is 92%. The concentrated wastewater 11 is discharged or disposed of; the diluted sodium chloride solution After entering the subsequent electrodialysis unit 4 for concentration, the concentrated sodium chloride solution 12 reaching 8 g / L is returned to the forward osmosis unit 3 as a drawing solution, and the obtained pure water 13 is reused at the same time.

Embodiment 3

[0033] The object of advanced treatment is the concentrated brine from the reverse osmosis desalination station, and the TDS (total dissolved solids) in the wastewater is about 8000mg / L.

[0034] The waste water 10 first enters the sand filter 1 for filtration, then enters the submerged ultrafiltration tank 2, and the ultrafiltration filtration accuracy is 0.1 micron, and then enters the forward osmosis unit 3; Sodium solution, after passing through the forward osmosis unit 3, the wastewater is concentrated to about 48g / L, the concentration factor is 6 times, and the water production rate is 83%. The concentrated wastewater 11 is discharged or disposed of; the diluted sodium chloride solution After entering the subsequent electrodialysis unit 4 for concentration, the concentrated sodium chloride solution 12 reaching 100 g / L is returned to the forward osmosis unit 3 as a drawing solution, and the obtained pure water 13 is reused at the same time.

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Abstract

The present invention relates to a wastewater desalination process with a high water yielding rate and a device thereof, belonging to the field of wastewater advanced treatment. In the process, by using a sodium chloride solution as a drawing solution, though the combination of forward osmosis and electrodialysis and the use of an osmotic pressure generated by a sodium chloride solution of a high concentration, water molecules naturally osmose and are drawn from wastewater with a high water yielding rate; pure water is obtained after the electrodialysis treatment of the diluted sodium chloride solution; and a concentrated sodium chloride solution is returned to a forward osmosis unit as the drawing solution. The device comprises the forward osmosis unit and an electrodialysis unit which are connected with each other; and the outlet of the electrodialysis unit is connected with the forward osmosis unit. According to the present invention, an electrodialysis membrane has no membrane fouling problem, membrane fouling of the forward osmosis membrane can be easily subjected to backwash to restore flux, and a very high water yielding rate can be achieved.

Description

technical field [0001] The invention relates to the technical field of wastewater advanced treatment, in particular to a wastewater desalination process and device with high water yield. Background technique [0002] Fresh water resources are the basic material for human survival and production. With population growth and economic development, human social life and production activities continue to intensify, and the demand for fresh water resources continues to increase. At the same time, water pollution is becoming more and more serious, making the shortage of fresh water resources gradually become a global crisis. Using desalination technology to desalinate wastewater is a feasible method to solve the shortage of water resources. For wastewater desalination and reuse, considering the water pollution caused by the wastewater itself, there are higher requirements for desalination water production rate and avoiding secondary pollution. [0003] At present, desalination tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
CPCY02A20/131
Inventor 李玉平林琳李海波
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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