Phosphorus Release from Sewage Sludge Incinerator Ash in a Corn and Soybean Field Study

In the Twin Cities, sewage sludge is incinerated and in the process 5 MW of power is generated per day.  Incineration produces significant amounts of ash (38 tons/day) which contains nearly 30% total phosphate (P2O5).  Currently, sewage sludge incinerator ash (SSA) is landfilled at a cost to taxpayers, but previous studies have shown that the ash has the potential to be a source of phosphorus (P) for crop production.