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Thursday, May 9, 2013

Feeding liquid polymer

Many water treatment plants use liquid polymers for coagulation or filter aids.  The liquid polymer is delivered in drums and often the polymer is fed directly from the drum using a chemical feed pump.  Most operators calculate the dosage based on the amount of liquid fed into the water flow.  In other words, the liquid polymer in the drum is considered 100% strength.  This is convenient for keeping track of the volume used so that the necessary inventory is kept on hand.

Example problem:  A treatment plant is processing 5 MGD.  It is using a liquid polymer as a filter aid and this chemical is being fed to the filter influent so the entire flow is treated.  The filter aid dosage is 0.5 ppm.  How many gallons of filter aid are used each day?  How long will a 55 gal drum last?

Work on this and I'll give the solution in the next post.

Bill

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Please send your question or comment. I will try to respond within a few days. Bill