Research On Ships’ Ballast Water Anti-sea Biological Technologys

In view of the increasingly serious harm caused by harmful micro-organisms carried byballast water, on the basis of research the present ballast water treatment methods andanalysis various ballast water treatment systems at home and abroad, this paper put forwarda kind of ballast water treatment technology roadmap about filtration with ultrasonicsynergistic UV germicidal. Using the principle of this technique route is: First of all, use afilter to remove microorganisms or solid particles which is greater than50μm in ballastwater, the remaining micro-organisms with the ballast water enter into the ultrasonic reactor,where the microorganism would be further broken by acoustic effect of ultrasonic, even bekilled directly, especially spores with a hard shell, ultrasound could crush the shells, so that,the spores without hard shells and remaining microorganisms enter into the UV processor,then all the microorganisms would be killed completely. Specific research mainly has thefollowing parts:1．Through research defects of ultraviolet separate sterilization, and analyze the theoryof the ultrasonic synergistic ultraviolet sterilization, eventually obtained the conclusions thatultrasonic pretreatment to ballast water can improve the bactericidal effect significantly, onthis basis, completed the design of the ultrasonic reactor.2．Through analysis principle of ultraviolet disinfection, as well as factors that affectUV germicidal effect, and combining different ultraviolet irradiation dose desired to kill thevarious microbial, completed the design of the UV sterilizer whose average dose is290mJ/cm2and processing capacity is300m3/h.3．After the simulation of UV sterilizers internal flow velocities, pressure andtemperature by Fluent software, obtained there is no short flows and eddies in sterilizerwater flow, both water impact bore by quartz sleeves and water temperature are in thereasonable range.4．After the simulation of UV germicidal light by TracePro software, combined withthe average flow speed of water in the sterilization, obtained that the average irradiationdose of the sterilization is slightly larger than the design dose of290mJ/cm2, but theirradiated evenness is not enough, occasionally there are one or two light black hole, on thisbasis, proposed the program of sterilizers structural optimization.5．Designed small reactor based on ultrasound collaborative UV germicidal technology,and the completion of the sterilization experiments. Through the analysis of the experimental results, concluded the feasibility of ultrasonic synergistic UV germicidaltechnology in the ballast water treatment.In this paper, through the design calculation, system simulation, and experimentalverification, filtering and ultrasonic collaborative UV germicidal technology processingballast water is feasible with larger theoretical significance and practical significance.