Sterilization by Ozone at Baltimore

Sterilization by Ozone at Baltimore

Baltimore sterilizes its water by the use of ozone generated by electricity. The plant has been erected at its Herring Run station and consists of a raw water chamber, aspirator heads, ozone chambers, ozone generator and a timecontact basin or mixing well. The ozone generator consists of a boiler-plate shell and head 30 inches high by 33 inches diameter. In this shell is a large number of aluminum tubes containing micanite tubes, serving as insulators for metallic tubes connected to one terminal of a transformer. The other terminal of the transformer, which gives from 10,000 to 15,000 volts, is connected to the ozone-generator shell. When the current is closed a continuous violet discharge occurs between the inner and outer tubes, producing ozone in the air passing through. By means of the time-contact basin or mixing cell the water is made to move horizontally as well as vertically in contact with the ozone, so as to give it a long time of action. Current is supplied to the transformer at about 2,000 volts, and there is a separate 5-kilowatt transformer for each mixing cell or basin. The capacity of each basin is 1,000,000 gallons of water in 24 hours.

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