High-efficiency treatment method of ballast water in ship

Abstract

The invention discloses a high-efficiency treatment method of ballast water in a ship and a device adopting the high-efficiency treatment method. The high-efficiency treatment method of ballast water in a ship comprises the following steps of 1, removing planktonts and suspended particles in ballast water by a high-efficiency filter, wherein the removed planktonts and the suspended particles have sizes of above 30 to 40 micrometers; 2, based on a branch electrolysis-based inactivation treatment technology, electrolyzing a part of seawater passing through an electrolysis unit into chlorine and hydrogen by the electrolysis unit, wherein the chlorine is fast dissolved in seawater to form sodium hypochlorite, and 3, feeding back the high-concentration sodium hypochlorite solution obtained by the step 2 to a ballast water feeding header pipe so that residual harmful aquatic organisms in the ballast water are killed. The high-efficiency treatment method of ballast water in a ship has the advantages that a technology of high efficiency filtration and branch electrolysis-based inactivation treatment and the equipment suitable for the technology are adopted; a technical flow is simple; a system volume is small; compared with the existing system, the device adopting the high-efficiency treatment method has a floor space reduced by above 30%; because of the utilization of branch electrolysis, a hydrogen generation amount is low so that hydrogen can be removed completely; a potential safety hazard is eliminated; installation is convenient; and safety and reliability are high.

Description

technical field [0001] The invention relates to a ship ballast water treatment technology, in particular to a high-efficiency ship ballast water treatment method. 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 are also loaded into the ballast tank, and are discharged to the destination with the ballast water after the voyage. earth waters. Ballast water follows ships from one place to another, causing the spread of harmful aquatic organisms and pathogens. It is estimated that there are more than 10 billion tons of ballast water in the world every year. It is estimated t...

AI Technical Summary

Problems solved by technology

The main problems of the ultraviolet method are: (1) poor penetrability, and a large amount of suspended matter in the water will block the irradiation of ultraviolet rays on organisms and pathogens, affecting the treatment effect; (2) largely dependent on the size and shape of organisms For example, due to its size and color, seaweed needs a larger dose than bacteria, blue-green seaweed is particularly resistant to ultraviolet rays, and the amount of radiation required to kill it is 2 to 3 orders of magnitude larger than the amount required to kill bacteria; ( 3) Some microorganisms have a restorative function and will recover from UV treatment, and some 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

[0022] There are many deficiencies in the existing electrolysis ship ballast water treatment technology: for the "online" electrolysis ship ballast water treatment technology, the defect is: since all the ballast water needs to flow through the electrolyzer, the volume of the electrolyzer is required It must be very large, especially for large ships, the amount of ballast water often reaches tens of thousands of tons or even one hundred thousand tons, and the flow rate of ballast water may exceed 4000m 3 / h, so that the volume of the whole device will be very large, and it is difficult to install it on board

Therefore, the scope of application of the system is largely limited

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