Anoxic Mixing Energy Savings

PHi mixing in anoxic basins results in a 50% energy savings over mechanical mixers!

The Department of Environmental Protection for New York City commissioned a study of PHi's mixing of a BNR basin at the city's Red Hook WPCP during 2005 and 2006. Their results showed that the PHi mixing system was significantly less expensive when compared to the existing submersible mechanical mixers in capital costs, maintenance costs, and energy usage.

Following is a summary of the test results:

• Both mixers achieved distribution of SS throughout the bulk volume of the anoxic zones.

• Initial capital cost is higher for the Davis EMU mixers than the PHi 9/18 Mixing System. Additionally, due to lower preventive maintenance and energy costs, the PHI 9/18 Mixing System has a lower capitalized cost.

• Over a 10 year period, the savings in capitalized costs using the PHI 9/18 Mixing System would be lower based on vendor’s own recommendations.

• Experience at the Red Hook WPCP suggests that the Davis EMU Uni-Prop mixers are prone to frequent breakdowns.

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