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Method for electrolyzing circulating cooling water and reverse osmosis concentrated water

A technology for circulating cooling water and reverse osmosis concentrated water, which is applied in chemical instruments and methods, water/sludge/sewage treatment, descaling and water softening, etc. It can solve the problems of large power consumption, narrow application range, and waste of energy utilization and other issues, to achieve the effects of saving electricity, easy promotion, and convenient operation

Inactive Publication Date: 2011-04-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the methods mentioned in the above documents play a certain role in the treatment of circulating water, they all have the disadvantages of large power consumption and narrow application range, which is a waste from the perspective of energy utilization.

Method used

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  • Method for electrolyzing circulating cooling water and reverse osmosis concentrated water
  • Method for electrolyzing circulating cooling water and reverse osmosis concentrated water
  • Method for electrolyzing circulating cooling water and reverse osmosis concentrated water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The circulating cooling water sample was taken, and its pH was measured to be 8.15, and its hardness was 600 (mg / L CaCO 3 ), the conductivity is 1760μS / cm. Electrolytic treatment was carried out under the conditions of adding fillers and no fillers, and after treatment, the pH, hardness, algae removal rate and conductivity were measured.

[0014] Experimental conditions: water sample volume 800mL, current density 20mA / cm 2 , the processing time is 60min, and the experimental results are shown in the table below.

[0015]

[0016] It can be seen from the above table that after adding tourmaline, due to the buffering effect of tourmaline on pH, the pH of the effluent is higher than that of direct electrolysis, which is beneficial to prevent corrosion, and the addition of fillers plays a role in catalytic electrolysis, hardness and algae removal rates have increased somewhat.

Embodiment 2

[0018] The circulating cooling water sample was taken, and its pH was measured to be 8.15, and its hardness was 600 (mg / L CaCO 3 ), the conductivity is 1760μS / cm. Electrolytic treatment was carried out under different current density conditions. After treatment, the pH, hardness, algae removal rate and conductivity were measured.

[0019] Experimental conditions: the volume of water sample is 800mL, the treatment time is 60min, and tourmaline is added as filler, the treatment effect is as follows:

[0020]

[0021] It can be seen from the above results that with the increase of the current density, the hardness and conductivity of the water sample are continuously reduced, while the algae removal rate is continuously increased. When the current density reached 10mA / cm2, almost all the algae were removed, and the hardness and conductivity of the water sample also dropped to a moderate level.

Embodiment 3

[0023] Treatment effect of replacing DC power supply with solar cells

[0024] Take high-hardness circulating water samples, and conduct electrolytic treatment with DC power supply and solar battery as power supply respectively. The initial pH of the circulating water is 8.56, and the hardness is 1060 (mg / L CaC0 3 ), the conductivity is 1721μS / cm.

[0025] Experimental conditions: water sample volume 800mL, current density 15mA / cm 2 , adding tourmaline as filler, the treatment time is 60min, the treatment effect is as follows:

[0026]

[0027] Through comparison, it is found that the same or even better processing effect can be achieved by replacing the direct current power supply with solar cells. The use of solar cells greatly saves the processing cost and achieves real energy saving and environmental protection.

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Abstract

The invention discloses a method for electrolyzing circulating cooling water and reverse osmosis concentrated water, belonging to the technical field of industrial water purification. The method is characterized in that broken natural tourmaline is adopted as a filler, and circulating cooling water and reverse osmosis concentrated water are electrolyzed in an electrolyzer which utilizes stainless steel as a cathode and a ruthenium-plated titanium net as an anode, wherein the strong alkalic environment on the cathode can facilitate precipitation of ions such as Ca, Mg and the like, substances with strong oxidability generated on the anode can kill algae and bacteria so as to achieve multiple purposes comprising scale prevention, sterilization and salinity reduction. With respect to the electrolyzer disclosed by the invention, solar energy can be utilized as a power supply for direct electrolysis, and meanwhile, tourmaline is utilized to adjust the pH value of buffer effluent, thus reducing the possibility of effluent scaling, and stabilizing water quality. The method has the advantages of energy conservation and good processing effect, is environment-friendly and is convenient in operation.

Description

technical field [0001] The invention belongs to the technical field of industrial water purification, and relates to a method for electrolyzing circulating cooling water and concentrated reverse osmosis water. The method can use solar energy as a power source instead of a traditional DC power source, and has a good application prospect in industry. technical background [0002] With the rapid development of the world economy, the global water resource shortage and water pollution problems have become more and more serious in front of people. At present, most of the industrial cooling water in our country adopts a circulation system, and general industrial water accounts for 80% of the total water consumption, and 2 / 3 of it is cooling water. To save water resources, the blowdown of the circulating cooling water system should be reduced as much as possible, and the concentration ratio of cooling water should be increased. At the same time, using the reverse osmosis membrane ...

Claims

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Application Information

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IPC IPC(8): C02F5/00
Inventor 马伟王刃姜晨赵南南黄琦程子洪
Owner DALIAN UNIV OF TECH
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