A Settling Process Using Magnetite Ballast Helps A Massachusetts Plant Meet Strict Phosphorus Limits

A phosphorous reduction process using magnetite ballast helps a Massachusetts treatment plant consistently meet strict effluent permit limits.
A Settling Process Using Magnetite Ballast Helps A Massachusetts Plant Meet Strict Phosphorus Limits
Dave Garabedian, operations and maintenance specialist, checks the shear mixer after the chemical bond between the floc and magnetite has been broken.

From April through October (in-season), effluent from the Billerica (Mass.) Wastewater Treatment Plant averaged 0.80 mg/L total phosphorus. From November through March (off-season), it averaged 1.55 mg/L. In 2008, the U.S. EPA lowered the plant’s total phosphorus limit to 0.20...

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