Removing Phosphorus from Surface and Drainage Waters
The P removal structures removes dissolved P in passing runoff water by utilizing various P sorption materials (PSMs), allowing for the trapped P to be removed from the watershed. An example of potential PSMs includes steel slag, drinking water treatment residuals, and flu-gas desulfurization gypsum. Many PSMs are inexpensive by-products of various industries. The model developed allows one to design a P removal structure for a targeted P load based on a user's chosen PSM. The user simply provides some basic parameters of their chosen PSM, typical runoff dissolved P concentrations and flow rates for the site location, and the desired "lifetime" of the structure. The lifetime of the structure is the time until the materials are "spent" and no longer effective at removing P. At that point the materials must be removed and replaced. On the other hand, the model can also be used to predict how long a structure will last for a given "cookie cutter" structure with specified PSMs.
Instantly removes dissolved P from runoff. Other best management practices only remove particulate P, not dissolved PAllows for P saturated spent materials to be removed, thereby allowing for a true "removal" of P from a watershed. Simple broadcast application of PSMs to soils only temporarily ties up P (i.e. temporarily reduces P solubility)Allows one to easily predict how much P will be removed by a given structure and also measure how much is actually removed by a structure. This is very valuable in regard to total maximum daily load (TMDL) regulations for non-point source runoff since no other best management practice can be quantified as easilyPredicts how long a given structure will last.
Runoff from barnyards with excessive P concentrations. These concentrations are very common in concentrated animal agriculture such as poultry, dairy, and swine industries. Runoff from agricultural fields with excessive P concentrations. Golf course runoff. Urban and suburban storm water drainage. Agricultural drainage ditches from areas with excessive soil P concentrations
System to remove dissolved P in passing runoff water by utilizing various P sorption materials (PSMs), allowing for the trapped P to be removed from the watershed.
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