Patent ID: 7776217

Claim:
A water treatment system for removing substances from water flowing into the system, comprising: a water treatment chamber comprising side walls, a bottom and an inlet; at least one retention layer comprising a media formulated for phosphorus retention, comprising at least one of water treatment residuals, red mud, red gypsum, and iron or aluminum-rich soils within the water treatment chamber, the retention layer positioned to receive water from the inlet; a drainage layer under the retention layer, constructed and arranged so that water treated through the retention layer can be collected by a drainage system; the drainage system under the inlet and retention layer, and within a drainage layer, constructed and arranged so that water to be treated can flow from the inlet, through the retention layer to the drainage system; the drainage system constructed to direct water that passed through the retention layer outside of the water treatment chamber; and the retention layer effective to treat a depth at least of over 24 inches of water passing through the layer within 24 hours, such water having a nitrogen content of at least 0.50 mg-l-1 or a phosphorus content of at least 0.30 mg-l-1 and reducing that nitrogen content by at least 40% or reducing the phosphorus content by at least 90%.