A subsection of technical specifications of UV disinfection equipment design parameter * Working medium: drain water out of sewage plant after secondary treatment, flocculation and filtration; * Installation requirement: Ultraviolet lamps are lay in disinfection cadals in horizontal and downstream way; * Power supply: voltage/frequency/phase, 380 5%/50HZ/3 or 220 5%/50HZ/1; * Daily handing capacity: 5000m3/d, peak flow is designed by 7000 m3/d; * Variation factor: K=1.4; * Water indicator: SS 10mg/l; * Group number of fecal coliform of water inlet ¾107/L; * Ultraviolet transmittance @254nm 65%; * Lifetime of lamp 12000h; * Group number of fecal coliform of effluent water 1000/L; * Effective UV biological test dose 20mJ/cm2; * Degree of protection: overwater component: IP65, underwater component: IP68.