Method for treating high-salt water by air stripping type membrane distillation

A treatment method, high brine technology, applied in the field of water desalination treatment, can solve the problems of less research and reports on membrane fouling, lower membrane water flux, lower membrane efficiency, etc., to control membrane fouling, increase membrane permeation flux, The effect of lowering the concentration

Active Publication Date: 2010-03-03
GO HIGHER ENVIRONMENT GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, direct contact membrane distillation has not been applied on a large scale. The main reasons are: high energy consumption leads to high operating costs; membrane-salt solution interface temperature polarization reduces the water flux of the membrane; long-term operation proc...

Method used

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  • Method for treating high-salt water by air stripping type membrane distillation

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Effect test

Embodiment 1

[0017] Example 1: Pilot test of high salt water treatment project, the salt concentration in the feed liquid is 6%, and the treatment capacity is 5m 3 / d, the liquid flow velocity on both sides of the cold and hot sides is 0.4~0.5m / s and 0.08~0.15m / s respectively, the feed temperature is 55℃, 65℃, 75℃ respectively, the cooling water temperature is 35℃, and the cooling water is reverse Permeate deionized water with a conductivity of 20μs / cm. The test results show that the membrane flux reaches 10kg / m under all operating conditions 2 For more than h, the membrane flux is increased by 15% compared with when the air stripping technology is not used, and the stable product water conductivity is maintained between 25 and 30 μs / cm, and the treatment effect is good.

Embodiment 2

[0018] Example 2: Pilot test of reverse osmosis concentrated water treatment project, the conductivity of concentrated water is 8000μs / cm, and the treatment capacity is 5m 3 / d, the liquid flow velocity on both sides of the cold and hot sides is 0.4~0.5m / s and 0.08~0.15m / s respectively, the feed temperature is 55℃, 65℃, 75℃ respectively, the cooling water temperature is 35℃, and the cooling water is reverse Permeate deionized water with a conductivity of 20μs / cm. The test results show that under all operating conditions, the membrane flux reaches 11kg / m 2 For more than h, the membrane flux is increased by 10% compared with when the air stripping technology is not used, and the stable product water conductivity is maintained between 25 and 30 μs / cm, and the treatment effect is good.

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Abstract

The invention provides a method for treating high-salt water by air stripping type membrane distillation. In the method, an air compressor is arranged in the system, a hydrothermal circulation pump and the air compressor jointly generate a gas-liquid two phase flow on a high-temperature side of a hydrophobic membrane, an electromagnetic valve is arranged on an air pipe, and pulse air intake is formed by the intermittent opening and closing of the electromagnetic valve. The method can effectively control membrane pollution and ensures the stable and high-efficiency operation of a membrane distillation device. The method has the main advantages of effectively relieving the concentration polarization of membrane distillation and preventing the formation of a gel layer due to the scraping effect of air bubbles on membrane surfaces in the gas-liquid two phase flow, and improving the turbulence scale of the membrane surfaces, increasing the membrane surface flow rate, reducing the concentration of membrane surface salt solution and increasing membrane permeation flux due to the adoption of pulse air intake. Air passing through a membrane component can be used for cooling membrane distillation penetrating fluid. The method of the invention can treat salt water with an extremely high concentration.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for water treatment, especially water desalination treatment, using air lift technology and membrane distillation technology. Background technique [0002] With the development of economy and the growth of population, the shortage of water resources has become a global problem, and the situation of water shortage in our country is particularly severe. my country's per capita water resources are only equivalent to 1 / 4 of the world's average level, and it is one of the 13 countries with very few water resources in the world. Among the more than 600 cities in the country, nearly 400 are short of water, and more than 130 of them are seriously short of water. At the same time, a large amount of waste water is directly discharged without treatment, causing serious water pollution and exacerbating the shortage of water resources. In terms of high-salt wast...

Claims

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Application Information

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IPC IPC(8): C02F1/04C02F1/44
CPCY02W10/37
Inventor 范正虹陈福泰唐震麻丽峰
Owner GO HIGHER ENVIRONMENT GRP CO LTD
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