| Ultraviolet Disinfection has towered over other wastewater Disinfection technologies and is most likely to take place of existing chlorine Disinfection as the future major one for its relatively simple equipment and operation, and possible capital and operating cost savings as well as its property that no chemicals are added to the wastewater to change the odor, taste or create possible toxic compounds.The research, by means of collimated beam device devised according to the indication by UDGM 2006, conducts Ultraviolet Disinfection Experiment over clarifier's effluent from three local WWTPs so as to obtain fecal coliform UV Dose-response Curve, thus concluding the UV Dose and Reduction Equivalent Dose needed by different UV Dose-responses. According to the statistical analysis of the experimental results, it is concluded that the data from three wastewater processing plants having been combined, UV Dose-response Curve ranges from 010 mJ·cm-2(equivalent of 03.0lg) in corresponds to the kinetic model of the first order reaction; when UV Dose comes to 15 mJ·cm-2, log Inactivation is able to amount to 3.5lg and then comes tailing in apparent way; when UV Dose increases to 25 mJ·cm-2, log Inactivation merely fluctuates between 00.5lg. On the basis of feasibility study of the FC concentration of influent of UV reactors, it is recommended that the FC concentration of influent of UV reactors should be 5×106MPN/L in coresponse to 1×103MPN/L and 1×104MPN/L whose REDMS2 are 39 mJ·cm-2和28 mJ·cm-2 respectively.Meanwhile, through the analysis of the choice of assaying challenge microorganisms by the above data, it is recommended that MS2 be used as assaying challenge microorganisms of RED instead of FC and TC.In addition, the research conducts feasibility study of UV intensity and Photorepair and Dark Repair, discovering that the same level of inactivation is achieved with a given UV dose regardless of whether that dose was obtained with a high UV intensity and low exposure time or vice versa and that there is no Photorepair and Dark Repair when FC is at the dosage of 15 mJ·cm-2.
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