THE OZONE PROCESS OF WATER PURIFICATION.
A test of the purification of water by the ozone process was recently made at Niagara Falls, N. Y. The ozone generator consisted of a rotary ozoner— a cylinder of cast iron, three feet in length and eighteen inches in diameter. It has twenty-five iron disks, each having a segment removed, in order to prevent the arching of the electric current which passes through it. The iron disks are on an iron shaft, operated by a current of electricity of 50,000 volts, revolving fifty times a minute, forming series of brush discharges. The air is passed through the machine and, coming into contact with the brush, discharges; the oxygen is removed, leaving the ozone. This flows in two pipe lines, one enters the top of a tower of brick and then meets a stream of water, both being conveyed through an emulsor. The contact of the water with the ozone changes the latter into a sprav, which aerates the water and removes a portion of the impurities. The water is then allowed to trickle down through several tons of finely crushed granite, and meets a current of ozone injected into the tower from the second pipe line. This removes all impurities which remain after encountering the first pipe line of ozone. Before any water is run through the tower it is first filtered. After the water passes through the tower, it drops in a large basin in the purified form.