Rare earth coagulant helps Hartford, WI achieve stringent phosphorus limit of 0.075mg/L
When the state of Wisconsin created stringent new water quality standards in 2013 to protect surface waters from eutrophication, about 400 treatment plants received tough new discharge limits for total phosphorus, ranging between 0.5 and 0.04 mg/L.
The impact of rare earth biosolids as a soil amendment
The precipitate from chemical phosphorus removal systems typically becomes a component of the total biosolids produced by a wastewater facility. Biosolids containing ferric and alum sludge are often used as a soil amendment to add phosphorus as well as other nutrients.
