Method for preventing and controlling structure biological defilement in water environment

A biofouling and structure technology, applied in the field of electrochemistry, can solve the problems of difficult operation stability and safety, expensive DSA electrodes, operating voltage and electrode replacement, operation and maintenance inconvenience, etc., to achieve good antifouling effect, equipment The effect of simple operation and significant environmental protection value

Inactive Publication Date: 2008-07-16
DALIAN UNIV OF TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

The composition of electrolytic chlorine production equipment is complex, the cost is high, the output voltage and output power of the power supply are huge, and the high power consumption brings problems of operation stability and safety at the same time
The DSA electrode used in electrolysis is expensive and has a short lifespan. It costs a lot to replace each time, and causes the equipment to stop, and the indirect loss is even more difficult to estimate.
Therefore, the cost of electrolytic antifouling is high due to the large investment in equipment and a large amount of power consumption, and the high operating voltage and electrode replacement make it inconvenient to operate and maintain, which greatly restricts the use of electrolytic antifouling.

Method used

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  • Method for preventing and controlling structure biological defilement in water environment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment one: laboratory culture

[0017] Establish a 500L seawater culture tank in the laboratory, the total salinity of seawater is 2.87 (g / 100g seawater), the concentration of calcium and magnesium ions is 0.63 (g / 100g seawater), the built-in biochemical filter is used to maintain water quality and dissolved oxygen, and the temperature relay and heating are used. The stick control culture temperature was 24°C, and the most typical fouling organism in the coast of China, Chthamalus challenger, was used as the culture object for the experiment. Using a DC stabilized power supply, the surface potential is negatively shifted by 0.90V based on the self-corrosion potential of the metal surface. At this time, the surface current density is 2.38×10 -6 mA / cm 2 . The cathodic experiment 316L stainless steel sheet mechanically polished with 500# sandpaper was immersed in seawater for protection test, and at the same time, it was put into a non-energized stainless steel shee...

Embodiment 2

[0018] Example 2: Sea water pendant experiment

[0019] At the inlet of a cooling seawater pipeline in a power plant, 6 sets of 316L stainless steel sheets and 6 titanium sheets were hung, and metal cathode test sheets were used for experiments, and their potentials were negatively shifted by 0.6V, 0.8V, 1.0V, 1.2V, 1.4V, and 1.6 respectively. V, put in hanging pieces of the same material size at the same time for comparison. After 64 days of hanging plate experiments, the surface of two hanging plates in the comparison hanging plate was almost covered with barnacles and mussels, and a small amount of limpets were attached, and there was no macroscopic biological adhesion on the surface of each hanging plate with cathodic current.

Embodiment 3

[0020] Example 3: Practical Application in the Factory - Trash Rack

[0021] Conduct cathode current on the second and third trash racks with a diameter of 5m in the No. 2 seawater cooling pipeline of a certain power plant, so that the potential is constant at a negative shift of 0.82V. Except for a small amount of adhesion, the overall protective effect is good. Taking half a year as the comparison period, the antifouling effect is better than the original electrolytic antifouling system whose operating cost is about 40 times that of this technology. At the same time, as a comparison to the same ruler grid that did not use any anti-fouling measures for the No. 1 pipeline due to equipment damage, barnacles and mussels had grown over the entire component, basically blocking the seawater pipeline.

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Abstract

The invention relates to a method for preventing biologic fouling by using electrochemical principle, which is applicable to various metal structures under the water environment and the antifouling project of conduction components, which comprises the steps: the structures for antifouling protection is connected with the cathode of power; the anode is conducted separately to form a loop; the protection current and the protection potential are determined according to the site environment, practical requirements and material quality of the structures under protection; after the power is started, occurrence of water biological coherence (water biological fouling) can be prevented with less current. The invention has the advantages that: the antifouling protection is realized by using the single current; the device is simplified; and the arrangement and operation cost is reduced. The invention also has the advantages of simple and convenient device, good controllability, steady operation, low cost and environmental protection.

Description

technical field [0001] The invention belongs to the field of electrochemistry and relates to a novel method for electrochemically preventing and controlling aquatic biofouling. Background technique [0002] Fouling organisms refer to aquatic organisms that are attached or fixed to underwater artificial facilities and cause huge losses to human economic activities, especially in marine environments, including aquatic microorganisms, aquatic plants and aquatic animals. The harm caused by fouling organisms is called biofouling, and the prevention of biofouling is called antifouling. Since the vast majority of biofouling is marine fouling, the most widely used antifouling methods are antifouling paint and seawater electrolysis. [0003] The antifouling coating method has two mechanisms of killing and reducing surface energy. The antifouling coatings used today have a limited service life, and all of them cause environmental pollution problems to varying degrees. Currently, they...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/467
Inventor 刘贵昌郭志强铁镝王绍东宋树军季伟光
Owner DALIAN UNIV OF TECH
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