P-RECOVERY

A 10-gal/min pilot system for a phosphorus-recovery technology was operated at the Madison (Wisconsin) Metropolitan Sewerage District during October and November 2018. The technology, known as CalPrex. incorporates a thickened sludge fermentation tank to increase the amount of soluble and reactive species of phosphorus, thereby increasing the recovery potential of that phosphorus, and produces a P-containing mineral for use as agricultural fertilizer (see Chem. Eng., June 2017, p. 9). The pilot project is being run by the Water Research Foundation (WRF), and the technology was developed at the University of Wisconsin at Madison. Results of the project will help water-resource recovery facilities evaluate and benchmark state-of-the-art alternatives for removing phosphorus from sludge going to digesters. An expert review of he project findings will be conducted, and the results will be disseminated to industry professionals in May 2019.


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