Solid algicide, preparation and usage in recirculating water

Details Solid algicide, preparation and usage in recirculating water Solid algicide, preparation and usage in recirculating water

2006-11-14

2006-11-14

Clardy, S. Mark (Department: 1617)

Plant protecting and regulating compositions

Plant growth regulating compositions

Aquatic plant regulator

C504S234000

Reexamination Certificate

active

07135436

ABSTRACT:
Technology is provided for treating recirculating water in a system to control algae in, for example, a cooling water, an evaporative condenser, a heat exchanger, or a decorative fountain. A solid composition comprising terbuthylazine dispersed in polyethylene glycol is contacted with recirculating water. The polyethylene glycol slowly dissolves, and the terbuthylazine is delivered into the water. The composition is preferably prepared by dispersing the terbuthylazine in molten polyethylene glycol followed by molding and solidifying. A preferred polyethylene glycol has an average molecular weight of about 8,000. The system can accomplish addition of terbuthylazine to recirculated water without the need for a dosing pump and without exposure of operating personnel to terbuthylazine.

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