|Item||The chlorine sterilization (solid chlorine)||Ultraviolet rays sterilization||Ozone sterilization|
|Sterilization principle||Chlorine converts and also, oxidize the cell of the bacteria and also have strong toxicity to the creature.||The ultraviolet rays act on deoxyribonucleic acid and destroy the connection of deoxyribonucleic acid.||The ozone is strong oxidization power and destroy the cell wall.|
|Device||Solid chlorine is contacted and cause do sterilization stayed and chlorine mixture tank with stiring. The device is cheap be easy. Yet, the security of the establishment place of chlorine mixture tank is necessary.||Irradiation quantity is controlled by an/the ultraviolet rays irradiation device, control disks. There is not the operation part and an easy device. (To middle degree expensive)||The complicated institution such as the ozone generator, reaction tank, residue ozone processing device are necessary. (Expensive)|
|Operation||The input of solid chlorine is adjusted, to keep the remaining chlorine density in treated water to a regular value. The processing quantity of water, the control of the small chlorine density that responded is difficult.||It respond and do the initial setting of irradiation quantity and maintain regular irradiation quantity by the ultraviolet rays monitor the processing quantity of water, ultraviolet rays transmission rate, SS density. (Automatic control)||Ozone occurrence quantity is controlled, to keep the remaining ozone density in treated water regularly. (Automatic control)|
|Safety of the operation person||If handle and pay attention, because it is solid chlorine there is not the risk of a special point. It avoids touching directly with the hand.||såêÈµtBecause it becomes the snow eye and extreme sunburn, when I swim the ultraviolet rays directly it does the cover of the device. The ordinariness has no problem because it is not disclosed.||When the ozone does direct drinking it is dangerous. The ordinariness has no problem because it is processed residue ozone.|
|Environment load||An organic chlorine compound is generated. Remaining chlorine, exposes the fishes etc. of the river to dangerous.||There is not the influence to a river, because there be not the subgeneration thing, remaining nature.||Peroxide is generated. Remaining ozone may become a problem.|
There are few machine that appoint it and the equipment is easy/cheap. |
Remaining chlorine, holds the occurrence of the algae.
There is the microorganism with the tolerance to chlorine.
Processing water, is difficult to give the change to the environment of the river. |
There is the reconnection of the destruction deoxyribonucleic acid by natural light.
There is the microorganism that I am not able to sterilize, wa it depends on the size kind.
The virus removal rate is high. |
The effect of bleaching, deodorization or it is.