Table 7344 Applications For Polyelectrolyte Flocculants

Municipal Water Treatment

Primary flocculation and sludge conditioning Municipal Waste Treatment Raw waste flocculation, phosphorus removal, and sludge conditioning (filtration, flotation, and centrifugation) Surface Water Treatment

River clarification, dredging operations, and construction runoff Industrial Water Treatment Raw water (influent), process water (internal), and wastewater (effluent)

After the polyelectrolyte is dispersed in water, it must be mechanically agitated to dissolve the polyelectrolyte. A typical agitator for a 400-gal tank requires a 1-hp motor and a marine propeller with a 200- to 400-rpm agitation velocity. The agitation time varies with the concentration of the stock solution and can range from 30 to 120 mins. Stock solution can remain in a storage tank for only several days because stock solutions are not stable for more than 3 to 4 weeks.

Because most polyelectrolytes are acidic, flocculant solutions should be prepared in lined steel, epoxy-reinforced fiberglass, 316SS, or other corrosion-resistant tanks. However, construction materials in the wastewater system downstream of the flocculant solution injection point are not affected by the corrosive effect of the polyelectrolytes since their dilution is in the ppm range or less.

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