AN ADVANCED PURIFICATION SYSTEM COMBINING OZONATION AND BAC, DEVELOPED BY THE BUREAU-OF-WATERWORKS, TOKYO-METROPOLITAN-GOVERNMENT

Since June 25, 1992, the Bureau has been operating an advanced water p urification facility which is a combination system of ozonation and bi ological activated carbon treatment to remove musty odor. The treatmen t performance of this system is getting good results in treated water quality because the facility can remove not only the musty odor substa nce (2-methyl isoborneol) but can also reduce the anionic surfactants, ammonia nitrogen and trihalomethane formation potential consistently and effectively. In the year since the facility was introduced, the mu sty odor has been removed from purified water, according to our expect ations, at the Kanamachi purification plant.