A Pilot Study On Reclaimed Water Disinfection With Chlorine Dioxide

Disinfection is the final process for safe reuse of reclaimed water and prolonging pipeline's service life. Therefore choosing disinfection is practical significance to us.In this work, a pilot plant was built in Xi'an Beishiqiao Company to disinfect reclaimed water with the chlorine dioxide.The conclusions suggest that: When following the chlorine dioxide dosing amount was 5.07mg/L, the total coliform bacteria and the total bacterial count respectively was 40MPN/L and 15CFU/mL. When following the chlorine dioxide dosing amount exceeded 7.67mg/L, no bacterial was found in the effluent, which can be satisfied with GB/Tl 8920-2002. Also the oxidizability of chlorine dioxide can be reaction with partial organic matters and the reducible inorganic substance, which removed COD, the turbidity and the chromaticity. Through to analyze the micro-organic materials of effluent, we found THMs and other 28 kinds hazardous substance have not increased obviously. While in the effluent of reclaimed water disinfect by chlorine, the concentration of THMs was around 4～6 times compare with influent water, and one kind of new DBPs-dibromochloromethane was discovered.In summary, chlorine dioxide could be an alternative disinfector for reclaimed water.