Document Type


Date of Award

Fall 10-31-1995

Degree Name

Master of Science in Environmental Engineering - (M.S.)


Civil and Environmental Engineering

First Advisor

Hsin Neng Hsieh

Second Advisor

Dorairaja Raghu

Third Advisor

Su Ling Cheng


Public Service Electric and Gas Company's Hudson Generating Station has historically had problems providing sufficient high quality water for its two once through, supercritical design boilers. The station requires over 60 million gallons annually to compensate for system losses.

The stations' ion exchange demineralizers proved to be costly to operate and overall inefficient in performance. Drawbacks include: short service cycles, periodic contamination of storage tanks due to premature breakthrough, prohibitively high chemical regenerant costs, excessive labor requirements, frequent resin replacement, and overall unreliable plant operations.

A reverse osmosis unit was installed as a pretreatment to the demineralizers to offset these shortcomings. This did not eliminate the demineralizers, but vastly reduced the influent loading and extended the service cycle more than twenty fold.

Significant cost savings have been realized, water quality was greatly improved, and plant reliability is secured into the next century.



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