Detoxification method and system for a liquid

The present invention is, when converted to harmless treated liquid clean by removing microorganisms in untreated liquid, it generates a chlorine-containing material from the mechanical treatment and the liquid to kill or sterilize damage the microorganisms in the liquid microorganisms injected in the liquid processing of a combination of the chlorination to kill or sterilize the microorganism with applying the liquid, seawater in the seawater introduced through seawater introduction passage at land-based or detoxification facilities offshore installation subjected to killing or sterilizing to detoxification and treatment seawater by be configured to accommodate the ballast water tanks, are reduced capital and operating costs, and without causing strength reduction processing liquid container side, any certainly none give killing or sterilizing size microorganisms, further increases the mounting space for such cargo to reduce the installation space of the detoxification unit ballast water in a ship And ability, characterized in that to enable suppressing hull modification cost for even detoxification device installation to existing vessels minimizes.