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HRC Innovation Earns Patent-Bay City Wastewater Treatment Plant June 5, 2007
HRC recently received a U.S. patent for a unique tertiary treatment process at the Bay City Wastewater Treatment Plant. The process includes pressure carbon filters which directly filter secondary effluent to remove polychlorinated biphenyl (PCB). The backwash from the filter system can be settled in a separate clarifier to segregate potential PCB solids from the remainder of the plant waste streams. The system saved Bay City over $5 million by not having to construct a pressure sand prefiltration system which was the prior state-of-the-art process. The system, which is the first of its kind in the world, could have additional applications for wastewaters which contain other organic contaminants. HRC also has a patent pending for an effluent screening system used in many combined sewer retention treatment basin designs.
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