Potsdam, New York Water Treatment Plant A Case History

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Abstract
The Village of Potsdam, in northern New York State, is presently building a new water treatment plant. The Village takes its water from the Raquette River. The 2.6 MGD water plant will feature ozonation as a pretreatment to coagulation, sedimentation and filtration. Raquette River water has a high trihalomethane formation potential, due to naturally-occurring organic substances. Ozonation provides a means for predisinfection without formation of trihalomethanes. The anticipated ozone dosage is 2.5 milligrams per liter sufficient ozone to impart aslight residual. Coagulation will be accomplished using aluminum sulfate and sodium alumnate. A nonionic polyelectrolyte will be used as a flocculant aid. The filter media will be Neptune-Microfloc Corp. MF 186. This treatment system was pilot plant tested with excellent results. Trihalomethane Maximum Formation Potential (MTP) was lowered by 67‰, from 353 micrograms per liter to 116 micrograms per liter. Construction contracts for the new plant, scheduled for completion the summer of 1983, tota l $4,443,000.

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