Composite cruising ballast water treatment process

Abstract

The invention belongs to the technical field of ballast water treatment in the shipping process, and relates to a composite ship ballast water treatment method. The method comprises two steps of high-efficiency filtration and inactivation treatment by a reinjection electrolysis process; the high-efficiency filtration is to serially connect a filter to an output port, through which the ballast water is loaded into a ship ballast tank, of a ballast pump to remove pelagic organisms and suspended particles; the rated flow of the filter is the same as the flow of the ballast water; the inactivation treatment by the reinjection electrolysis method is that when the ballast water is loaded, a booster pump is used to extract partial ballast water from a water inlet manifold at an outlet end of the filter to flow through an electrolytic tank, and chloride ions are oxidized on a positive electrode of the electrolytic tank to generate chlorine to be dissolved in the ballast water to generate sodium hypochlorite; and the sodium hypochlorite solution is reinjected into the water inlet manifold by the booster pump to be mixed evenly to ensure that the concentration of the sodium hypochlorite realizes the killing to residual harmful aquatic organisms. The method has the advantages of simple process route, reliable principle, and good treatment effect.

Description

Technical field: [0001] The invention belongs to the technical field of loading water treatment during ship shipping, and in particular relates to a composite ship ballast water treatment process. Background technique: [0002] With the continuous acceleration of the global economic integration process, the international logistics industry is growing rapidly. Shipping is an important part of the global logistics chain. According to statistics, more than 80% of goods in international trade are transshipped by ships. During the voyage of the ship, ballast is an inevitable state. When the ship is loaded with ballast water, the local aquatic organisms will also be loaded into the ballast tank, until the end of the voyage is discharged with the ballast water. Destination area. Ballast water follows ships from one place to another, causing the spread of harmful aquatic organisms and pathogens. It is estimated that there are about 10 billion tons of ballast water in the world eve...

AI Technical Summary

Problems solved by technology

The main problems of the ultraviolet method are: (1) poor penetrability, a large amount of suspended matter in the water will block the irradiation of ultraviolet rays on organisms and pathogens, affect the treatment effect, and consume a lot of energy; (2) rely heavily on Depending on the size and shape of the microorganism, for example seaweed requires a larger dose than bacteria due to its size and color, blue-green seaweed is particularly resistant to UV rays and requires more radiation to kill it than bacteria ~Level 3; (3) Some microorganisms have a repair function and will recover from UV treatment, and some bacteria and other phytoplankton are similar

The disadvantages of the ozone method are: (1) the equipment occupies a large area and the installation on the ship is limited; (2) the ozone treatment of seawater will produce harmful substances such as bromate, which may cause secondary pollution

The disadvantage of this "online" electrolysis ship ballast water treatment technology is: since all the ballast water needs to flow through the electrolyzer, the volume of the electrolyzer must be very large, especially for large ships, the ballast water often reaches several 10,000 tons or even more than 100,000 tons, the flow of ballast water may exceed 5000m 3 / h, so that the volume of the whole device will be very large, and it is difficult to install it on board

In addition, for the processing unit, the filtration accuracy of 50um is low. Due to the irregular shape of the organisms in the ocean, some plankton with a size greater than 50um specified in the D-2 standard can still pass through the filter, and these must be killed. Larger organisms require a higher concentration of sodium hypochlorite, the direct consequence of which is an increase in equipment operating costs, and because of the increase in related chemical substances produced, it will have an adverse impact on the marine environment

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