DeKalb County, GA, will use a $4.7 million clarification and sedimentation system from USFilter to treat 150 mgd of drinking water and to treat filter backwash water.
The system, to be installed at the Scott Candler Water Filter Plant near Doraville, GA, will consist of inclined plate separators from USFilter's Zimpro Products, solids thickener mechanisms from USFilter's Envirex Products, and EMU flocculation mixers from USFilter's Davis Products.
The 150-mgd facility expansion and upgrade, designed by CDM (Atlanta, GA), project engineer and construction manager, incorporates 180 separator plate packs which will be installed in 12 basins for pre-treatment and removal of suspended solids from the raw water. Another 30 plate packs, equipped with the thickener mechanisms, will be installed in two additional basins to remove solids from filter backwash water.
Each plate pack will consist of 85 stainless steel plates. Total area covered by the plate packs will be 55,600 square feet or 1.3 acres.
The 4.4 hp EMU mixers feature single planetary gear reduction and the latest designs in molded mixer propellers. Documented case studies have proven the use of this style mixer, which provide significant operating cost savings over conventional direct-coupled mixers with fabricated steel propellers.
