Document Type


Date of Award


Degree Name

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


Chemical Engineering and Chemistry

First Advisor

John E. McCormick

Second Advisor

Dimitrios P. Tassios

Third Advisor

Angelo J. Perna


The present work is concerned with a newer technique and approach to the problem of phosphate removal from waste water. This includes the removal of phosphate from the sample of activated sludge, i.e., a sample from the aeration tank of the secondary sewage treatment. The phosphate is removed by using ferric chloride as a precipitating agent and a cationic polyelectrolyte (P.E.) as a flocculating agent. Results of this study showed that: (a) P.E. addition gives a significant improvement in phosphate removal over that obtained by ferric chloride alone. In some cases the phosphate removal increased from 92 to 96.5 per cent by the addition of a small amount of cationic P.E., (b) There is a general trend in phosphate removal that for a given amount of phosphate in the sewage sample one P.E. concentration gives a peak removal. Below and above this concentration the removal is lower then the peak. (c) The amount of phosphate left after the total treatment is approximately the same in all tests and amounts to 2.6 to 2.7 ppm. (d) A correlation between initial phosphate content and the amount of P.E. needed to obtain the peak removal is a straight line on log-log graph paper.



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