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Immersed dissolved gas vacuum membrane distillation water processing method

A treatment method and vacuum membrane technology, which are applied in heating water/sewage treatment, permeation/dialysis water/sewage treatment, etc., can solve the problems of fouling at the inlet of membrane modules, reduced vacuum on the permeate side, and difficult cleaning of membrane modules, etc. To achieve the effect of small heat conduction loss, reducing heat loss and realizing resource utilization

Active Publication Date: 2015-04-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that due to the thinner membrane filaments, it is easy to cause fouling at the inlet of the membrane module and inside the membrane filaments, and the concentration polarization has a greater impact, which is easy to form membrane fouling, and the polluted membrane modules are not easy to clean
In addition, due to the external operation, part of the heat is lost during pipeline transportation, and the heat utilization rate is low, and the excessive gas volume is likely to reduce the vacuum degree of the permeate side and increase energy consumption
The above patents all use an air compressor or a fan to blow air in. The air compressor or fan produces large air bubbles, which are mixed with sewage in the pipeline and then enter the membrane module. Due to the limitation of the pipeline, the dispersion of the gas in the water may be caused. Not good, problems such as uneven air-water mixing

Method used

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  • Immersed dissolved gas vacuum membrane distillation water processing method
  • Immersed dissolved gas vacuum membrane distillation water processing method
  • Immersed dissolved gas vacuum membrane distillation water processing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The reverse osmosis concentrated water of a petrochemical enterprise, the main water quality characteristics are: sewage pH 8, 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 -N 2mg / L, turbidity 2NTU. For a schematic diagram of the process, see figure 1 .

[0048] The membrane distillation module used is a polytetrafluoroethylene plate-and-frame hydrophobic membrane module with a membrane pore size of 0.2 μm.

[0049] The process is as follows: First, the reverse osmosis concentrated water with a pH of 8 as influent water is dissolved into air with a gas-liquid volume ratio of 0.08:1 through an air-dissolving pump to form a gas-liquid mixture of influent water and air. The gas flow meter is used for metering; the gas-liquid mixture of the incoming water enters the heating water tank under the action of the dissolved air pump, and after being heated to a predetermined temperature of 7...

Embodiment 2

[0052] The main water quality characteristics of reverse osmosis concentrated water in a petrochemical enterprise are the same as in Example 1. For a schematic diagram of the process, see figure 1 .

[0053] The difference between the membrane distillation process of Example 2 and Example 1 is that the reverse osmosis concentrated water with a pH of 8 as the feed water is dissolved into the air with a gas-liquid volume ratio of 0.12:1 through the dissolved air pump to form a gas-liquid mixture of the feed water, and other membranes Distillation treatment conditions were the same as in Example 1.

[0054] The membrane distillation treatment effect of reverse osmosis concentrated water is shown in Table 2.

Embodiment 3

[0056] The main water quality characteristics of reverse osmosis concentrated water in a petrochemical enterprise are the same as in Example 1. For a schematic diagram of the process, see figure 1 .

[0057] The membrane distillation module used in Example 3 is a polypropylene hollow fiber curtain-type hydrophobic membrane module with a membrane pore size of 0.2 μm. Its membrane distillation process is different from Example 1 in that: the reverse osmosis concentrated water used as feed water is dissolved into air with a gas-liquid volume ratio of 0.12:1 through a dissolved air pump to form a feed water gas-liquid mixture, and the permeation side of the membrane distillation module (in the membrane hole of the hollow fiber membrane module) was vacuumed to form a negative pressure of -0.1MPa, and the other membrane distillation treatment conditions were the same as in Example 1.

[0058] The membrane distillation treatment effect of reverse osmosis concentrated water is shown...

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Abstract

The invention relates to an immersed dissolved gas vacuum membrane distillation water processing method. The method comprises the following steps: immersing a distillation membrane distillation assembly in a heating water box, dissolving a gas in inlet water through adopting a gas dissolving pump, and effectively removing pollutants in the inlet water through vacuum membrane distillation 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, good membrane pollution resistance and long running period. 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 submerged gas-dissolved vacuum membrane distillation treatment method for reverse osmosis concentrated water. More specifically, the present invention relates to a reverse osmosis process for petrochemical enterprises. Dissolved-air vacuum membrane distillation treatment and reuse of concentrated water. Background technique [0002] In recent years, in response to the national call for energy conservation and emission reduction, wastewater from petrochemical enterprises mostly adopts ultrafiltration / reverse osmosis double-membrane process for advanced treatment and reuse, which basically meets the water demand of upstream production processes. However, the resulting reverse osmosis concentrated water has become a difficult problem to deal with, and this waste water can neither be discharged nor reused, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/44C02F1/04
Inventor 张新妙赵鹏杨永强彭海珠
Owner CHINA PETROLEUM & CHEM CORP
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