Ballast water treatment system equipped with back pressure forming unit and control method thereof

Abstract

Disclosed herein are a ballast water treatment system having a back-pressure formation unit and a control method thereof. Back pressure in a filtering unit is checked and formed during a back washing operation for a filter of a filtering unit, thus enabling efficient back washing operation. Both a method of physically filtering ballast water using the filter and a method of sterilizing ballast water using ultraviolet rays are used to treat ballast water, thus preventing secondary contamination due to byproducts, and preventing the contamination of a ballast tank. A flow rate of ballast water introduced into an ultraviolet treatment unit is controlled such that the efficiency of the ultraviolet treatment unit is not reduced, while back pressure is formed in the filtering unit, thus increasing the overall treatment efficiency of the ballast water treatment system. Further, the filtering unit or the ultraviolet treatment unit may be automatically washed.

Description

technical field [0001] The present invention relates to a ballast water treatment system and a control method thereof for ships, and more particularly to a ballast water treatment system and a method thereof with a back pressure forming part, which checks and forms The back pressure in the filter part is used to ensure effective backwashing; when treating ballast water, the method of physical filtration with filters and the method of sterilization with ultraviolet rays are used in combination to prevent secondary pollution caused by by-products And prevent the pollution of the ballast water tank; while forming the back pressure in the filter part, the flow rate of the ballast water flowing into the ultraviolet treatment part can also be controlled at a level that does not reduce the efficiency of the ultraviolet treatment part, so that the ballast water treatment system can be effectively used Overall treatment efficiency; automatic cleaning of the filter unit or UV treatment ...

AI Technical Summary

Problems solved by technology

[0004] However, the heat treatment method has the problem of being difficult to deal with heat-resistant microorganisms or inorganic pollution sources; the chemical treatment method may cause secondary pollution after the ballast water is treated; the electrolysis or ozone treatment method has short-circuit caused by explosion or The problem of low management efficiency; the filtration method has a problem that it is difficult to remove the sediment attached to the filter; and the method of irradiating ultraviolet rays has the problem that foreign matter attached to the surface of the sleeve surrounding the ultraviolet lamp reduces efficiency.

[0005] figure 1 It is a system diagram of a ballast water treatment facility using a conventional filtration method in which cleaning operations are performed to remove foreign matter adhering to the inside of the filter a1 in the filter unit a , the pressure inside the filter part a must be higher than the external pressure (that is, the pressure inside the cleaning part a2 that sucks the foreign matter inside the filter a1), that is, to form a back pressure (backpressure, "back pressure" in the present invention refers to the pressure caused by filtration. The pressure inside the main body a3 of part a is higher than the pressure inside the cleaning part a2 that sucks the foreign matter inside the filter a1, so that the ballast water or foreign matter moves from the inside of the main body a3 of the filter part a to the side of the cleaning part a2) The cleaning operation can be successfully completed, and even if the ballast water pump is used to pressurize the ballast water supply to the filter part a, if the inside of the ballast water tank b used to store the filtered ballast water is empty or the stored ballast water When the amount is small, the required back pressure cannot be formed, so the cleaning operation cannot be completed smoothly

In particular, if figure 2 As shown, due to restrictions on the site where ballast water treatment facilities are installed on ships, etc., if the filter part a is installed at a higher position than the ballast water tank b, it will often be more difficult to maintain the required back pressure due to head loss. , therefore, there is a need for a system that can smoothly clean the foreign matter inside the filter under the above-mentioned limited conditions

Images