Process for purifying and recycling hot water by membrane method

A hot water and process technology, applied in the fields of water treatment, reclaimed water reuse and energy recovery, can solve the problems of low iron and silicon removal rate, limited application range, easy fouling and blocking, etc.

Inactive Publication Date: 2011-01-05
刘春喜
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low removal rate of iron and silicon in water by the ceramic membrane, easy fouling, and high working pressure (the working pressure is usually around 1MPa), the membrane flux decays quickly, difficult cleaning, frequent cleaning and other reasons, resulting in high treatment costs; In addition, during the process of treating condensed water with ceramic membranes, the silicon content in the effluent of the membranes often increases, and the silicon in the ceramic membranes will exchange with calcium and magnesium ions in the water, which has a silicon-dissolving effect.
Therefore, the application of ceramic membranes in high-temperature condensate degreasing treatment is still immature,

Method used

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  • Process for purifying and recycling hot water by membrane method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0050] Implementation case 1: Degreasing test of oily hot water. The raw water is the cooling water of a slightly oily air compressor in an oil refinery (the first-level desalted water is used as the cooling water). The water temperature is 51--55°C. Type ultrafiltration membrane degreasing treatment, the system recovery rate is 90%, the test results are shown in Table 1:

[0051] Table 1 Air compressor cooling water degreasing test data

[0052]

[0053] The raw water used in the test is the air compressor cooling water of an oil refinery of a petrochemical company. Its water quality is similar to that of the steam heating condensed water of an oil refinery. The oil content in the water is low, mainly lubricating oil for the shaft of the air compressor. According to the test results, the ultrafiltration membrane has a very high removal rate of oil in water - greater than 95%, while the ultrafiltration membrane has a low removal rate of silica in water, mainly due to the co...

Embodiment 2

[0054] Example 2: Degreasing test of wet copper raffinate in a gold smelting plant. The test temperature is 36-43°C. The ultrafiltration membrane adopts a 0.01um roll-type high-temperature ultrafiltration degreasing membrane for degreasing treatment test. The raw water is the raffinate of the copper smelter. After the raw water is deoiled, it provides qualified influent water for the reverse osmosis concentration treatment. The test data are shown in Table 2:

[0055] Table 2 Test data of ultrafiltration membrane oil removal effect of copper smelting raffinate

[0056]

[0057] According to the test data analysis, the ultrafiltration membrane has a very good removal effect on the oil in the copper raffinate. Since the removal rate of the ultrafiltration membrane to the floating oil and emulsion in the water is close to 100%, the copper raffinate In the acidic environment, the oil basically exists in the state of slick oil and emulsified oil, and the oil in the water comes f...

Embodiment 3

[0058] Example 3: High temperature reverse osmosis desalination, organic matter test and activated carbon adsorption test. The test raw water is slightly polluted condensate water from the refinery, the test temperature is 45-50°C, and the recovery rate of the membrane system is 90%. The test results are shown in Table 3:

[0059] Table 3 Reverse osmosis desalination, organic matter removal and activated carbon adsorption test data

[0060]

[0061] According to the test results, the high-temperature reverse osmosis membrane is effective in removing salt and organic matter (TOC) in water, but the effect is not ideal. The removal rate of organic matter decreases. On the other hand, the components that constitute TOC and TDS in water may be organic salts. The removal rate of organic matter in water by reverse osmosis membranes will vary with the composition of organic matter. In addition, when the content of salt and organic matter in water is low , the detachment rate of th...

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Abstract

The invention relates to a process for purifying and recycling hot water by a membrane method as well as used equipment and process flow thereof. The process is a technology for treating, purifying and recycling hot and industrial high-temperature wastewater on the basis of a membrane method. The process has the characteristics that the combined process of an ultrafiltration and microfiltration membrane system, reverse osmosis, a nanofiltration membrane system, pretreatment, active carbon adsorption, ion exchange, and the like can be operated at high temperature and purify different hot water and wastewater, has dual effects of recycling water resources and heat energy and can adopt different process combinations and process flows according to components of water quality so as to achieve the aims of simplifying the process flows and reducing the system and running cost.

Description

Technical field: [0001] The present invention relates to the technology of treating, purifying and reusing hot water based on the membrane method, as well as the equipment and technological process used to realize the present invention, which is characterized in that the treated water is high-temperature water and waste water (water temperature ≥ 45°C ), belonging to the fields of water treatment, reclaimed water reuse and energy recovery. Background technique: [0002] High-temperature salty and oily industrial water and waste water mainly come from many industrial fields such as oil refining, chemical industry, fertilizer, oil exploitation, power generation, heat supply, alumina production, hollow brick manufacturing, etc. Such as steam condensate water from thermal power plants, heat-tracing high-temperature condensate water from oil refining and chemical industry; acid gas water from catalytic cracking, hydrogenation and other devices in oil refineries; oilfield produced...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 刘春喜
Owner 刘春喜
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