Ship ballast water treating method

A technology of ship ballast water and treatment method, applied in the field of water treatment, can solve the problems of secondary pollution of sea water, large equipment volume, incomplete sterilization, etc., and achieve the effect of wide application scope, small equipment volume, and small negative impact.

Inactive Publication Date: 2014-09-03
SHANGHAI JIAO TONG UNIV +1
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  • Abstract
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Problems solved by technology

[0010] What is currently needed can overcome the shortcomings of the existing sea-going ship ballast water treatment technology, such as large equipment volume, high energy consumption, incomplete sterilization, secondary pollution to seawater, poor treatment effect, etc., and invent a brand new one. High-efficiency, low-energy-consumption, and no-secondary-pollution ballast water treatment process can meet the requirements of the International Maritime Organization, namely: safe, reliable, effective, environmentally acceptable and reasonable in cost

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  • Ship ballast water treating method

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Embodiment Construction

[0036] The ship ballast water treatment method of the present invention comprises the following steps:

[0037] 1) Filter the seawater prepared as ballast water through a 25 μm filter; to remove plankton and the like larger than 25 μm.

[0038] 2) Dissolve ozone in 10% of the filtered seawater to make 2-3mg / L ozone aqueous solution, and then mix it with the remaining 90% of seawater in the pipeline for ozone oxidation sterilization. The biochemical reaction time is 5-10 Second. The ozone is generated by an ozone generator that electrolyzes pure water to produce ozone, and the ozone is dissolved into the seawater by using a gas-liquid mixing pump to efficiently dissolve the ozone into the seawater.

[0039] 3) The seawater sterilized by ozone oxidation is subjected to ultrasonic cavitation sterilization with low-frequency sound waves with a frequency around 15 kHz; the ultrasonic waves are generated by ultrasonic transducers.

[0040] 4) The seawater sterilized by ultrasonic ...

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Abstract

The invention discloses a ship ballast water treating method which comprises the following steps: (1), filtering seawater by a filter; (2), carrying out ozone oxidization and sterilization; (3), carrying out ultrasonic-wave cavitation and sterilization; (4), carrying out ultraviolet sterilization; (5), conveying the water into a ballast bin as ballast water; (6), carrying out back-flushing with seawater for a filter after a ballasting process is ended; (7), treating according to the steps (2), (3) and (4) before the ballast water is exhausted; (8), exhausting the treated and qualified ballast water. According to the invention, synergistic effects of ozone oxidization and sterilization, ultrasonic-wave cavitation and sterilization and ultraviolet-light radiation sterilization are performed, equipment is small in size, low in energy consumption, high in treating efficiency and wide in range of application. Moreover, treatment scale can be flexibly regulated by increasing or reducing number of ozone generators, ultrasonic transducers, low-pressure mercury lamps, so that the treatment capacity can be 20m<3> / h-5000m<3> / h. Besides, organic pollutants in seawater can be degraded while microorganisms are killed, so that the water quality of the exhausted ballast water is improved.

Description

technical field [0001] The invention relates to water treatment, in particular to a treatment method for ship ballast water. Background technique [0002] With the rapid development of the global shipping economy, there are more and more ships, larger and larger ships, and faster and faster ships. Ballast water is an important guarantee for safe navigation of ships. It is estimated that the ballast water carried by ships around the world is about 12 billion tons per year, and it is still increasing year by year with the development of the shipping industry. There are more than 4,500 species of organisms that exist in the ballast water of ships and travel around the world every day. Many species of bacteria, plants and animals can still survive in ballast water and its sediments over months of voyage. Biological invasions and epidemics caused by the migration of organisms in the ballast water of ships around the world have frequently occurred against the marine environment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08
Inventor 迟莉娜李高洁
Owner SHANGHAI JIAO TONG UNIV
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