| Invasive aquatic species are one of the four greatest threats to the worlds oceans. If they were introduced to the colonies, can impact extremely on environmental, economic and public health and residential health. Ballast water discharges lead to marine invasion between geographically isolated water, and are the main approach to spreading harmful microorganism. It's a hot topic that how to treat ballast water by security and feasible method.Based on the key NSFC Project (No. 60031001), NKBRSF project(No. 2002CCC00900), we use the hydroxyl kill the oceanic microorganisms, and have some research on the killing mechanism, killing effect, and the affection on waiter quality. Following as a result:1. Hydroxyl radical has the advantages of strong oxidation, rapidly reaction, strong killing effect on oceanic microorganisms, and no second pollution for oceanic environment. It is consist with the standards of treating ballast water, and is the research direction.2. Using strong ionization discharge, high-concentration and great-yield hydroxyl radical could be produced; and hydroxyl solution is obtained by high-efficiency dissolution method, the solution concentration can up to 4mg/L.3. The 20t/h pilotscale experiments results indicate that the kill efficiency of Heterotrophic Bacteria reaches 100%, with a hydroxyl ratio concentration of 0.45mg/L. when the ratio concentration up to 0.54mg/L, membrane lipid peroxidation and antioxidase of Dunaliella salina were damaged completely, activities of SOD, POD and CAT dropped rapidly, and the MDA content of Dunaliella salina rised more than 2 times. At the concentration of 0.65mg/L, hydroxyl radical can effectively kill microorganism of ship ballast water in the 2m(reaction time about 1s) outlet pipeline, and decompose the chlorophyll-a; meliorate the ballast water quality, the induce of NH4+, NO2- and COD 98%.Experimental results indicate hydroxyl is feasible in treating ship ballast water.
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