Initial Pilot Testing
In the summer of 2007, a pilot of the CoMag® system proved its ability to meet the new TP limit with alum, polyaluminum chloride (PACL), ferric chloride or sodium aluminate coagulants. Additionally, the pilot proved that the CoMag system could meet future permit limits as low as 0.05 g/L without polishing filters by simply increasing the coagulant dose.
Full-Scale Installation Results
Since it was first installed at Billerica in 2010, the CoMag® system has proven to be a reliable and versatile tertiary treatment process with the capability to achieve any effluent TP target down to less than 0.05 mg/L, while also achieving significant reductions in total suspended solids (38 percent), BOD (59 percent) and other contaminants.