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Reverse osmosis concentrated water dissolved gas type vacuum membrane distillation water processing method

A technology of reverse osmosis concentrated water and membrane distillation, applied in osmosis/dialysis water/sewage treatment, heating water/sewage treatment, etc. Realize the effect of resource utilization, reducing condensation and improving recovery rate

Active Publication Date: 2015-02-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Some of the above-mentioned vacuum membrane distillation technologies have a large heat conduction loss during operation; some use an air compressor or fan to blow in air, and the air compressor or fan produces large bubbles, which are mixed with sewage in the pipeline and then enter the membrane module. , due to pipeline restrictions, it may cause problems such as poor dispersion of gas in water, uneven mixing of soda and water; other technologies require more equipment, complex structure, high cost, large energy consumption, and difficult to operate complicated process

Method used

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  • Reverse osmosis concentrated water dissolved gas type vacuum membrane distillation water processing method
  • Reverse osmosis concentrated water dissolved gas type vacuum membrane distillation water processing method
  • Reverse osmosis concentrated water dissolved gas type vacuum membrane distillation water processing method

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Effect test

Embodiment 1

[0039] The reverse osmosis concentrated water of olefin polymerization catalyst production wastewater in a petrochemical enterprise, the main water quality characteristics are: sewage pH8, conductivity 25mS / cm, COD Cr 242mg / L, Ca 2+ 214mg / L, Mg 2+ 227mg / L, Na + 5078mg / L, Cl - 8407mg / L, dissolved silicon 36mg / L, NH 4 -N2 mg / L. For a schematic diagram of the process, see figure 1 .

[0040] The membrane distillation module used is a polyvinylidene fluoride hollow fiber hydrophobic membrane module with a membrane pore size of 0.2 μm. The process is as follows: First, the concentrated reverse osmosis water of the olefin polymerization catalyst production wastewater with a pH of 8 at the feed end enters the heating water tank and is heated to a predetermined temperature of 75°C to obtain feed water at 75°C; secondly, the feed water at 75°C is dissolved into the Air with a gas-liquid volume ratio of 0.08:1 forms a water-gas-liquid mixture, and the amounts of water and air are...

Embodiment 2

[0043] The main water quality characteristics of the reverse osmosis concentrated water of the olefin polymerization catalyst production wastewater are the same as in Example 1. For a schematic diagram of the process, see figure 1 .

[0044] The membrane distillation process of Example 2 is different from Example 1 in that: the influent water at 65°C is dissolved with air with a gas-liquid volume ratio of 0.12:1 to form a gas-liquid mixture of influent water, and other membrane distillation treatment conditions are the same as in Example 1.

[0045] The membrane distillation treatment effect of reverse osmosis concentrated water is shown in Table 2.

Embodiment 3

[0047] The main water quality characteristics of the reverse osmosis concentrated water of the olefin polymerization catalyst production wastewater are the same as in Example 1. For a schematic diagram of the process, see figure 1 .

[0048] The membrane distillation process of Example 3 is different from Example 1 in that: air with a gas-liquid volume ratio of 0.12:1 is dissolved in the influent water to form a gas-liquid mixture in the influent water, and other membrane distillation treatment conditions are the same as in Example 1.

[0049] The membrane distillation treatment effect of reverse osmosis concentrated water is shown in Table 2.

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Abstract

The invention relates to a reverse osmosis concentrated water dissolved gas type vacuum membrane distillation water processing method. The method adopts a gas dissolving pump to dissolve a gas in inlet water at a feeding end and adopts vacuum membrane distillation to effectively remove pollutants in the inlet water in order to realize the separation and concentration of the pollutants in the inlet water. The method has the advantages of simple required equipment, uniform gas-liquid mixing, low energy consumption and cost, simple operation, small membrane pollution, long running period, and large membrane running flux. The method can effectively remove a large amount of salts, a small amount of COD and other pollutants in the wastewater, reduce the sewage discharge amount and realize the efficient utilization of a water resource when the method is used for processing reverse osmosis concentrated water of wastewater generated in the production of an olefin polymerization catalyst.

Description

technical field [0001] The present invention relates to the technical field of water treatment and membrane separation. Specifically, the present invention relates to a method for treating concentrated reverse osmosis water with dissolved air vacuum membrane distillation. More specifically, the present invention relates to a method for treating waste water produced by olefin polymerization catalysts. Dissolved-gas vacuum membrane distillation advanced treatment and reuse method of reverse osmosis concentrated water. Background technique [0002] A large amount of wastewater will be generated during the production of olefin polymerization catalysts. The wastewater contains various pollutants such as petroleum and benzene series, and its COD concentration is higher than 10,000mg / L. At present, the waste water can basically meet the discharge standard after being treated by the method described in the patent CN1257851C (oil separation sediment + pH adjustment + flocculation air...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/08C02F1/44
Inventor 张新妙杨永强赵鹏彭海珠
Owner CHINA PETROLEUM & CHEM CORP
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