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Comment Environment, Health, Safety & Security

Municipal water sludge-optimization technology poised for growth

By Scott Jenkins |

A sludge-optimization technology for municipal water-treatment facilities is poised for rapid growth after the exclusive worldwide patent-licensing rights for the technology were acquired by CNP Technology Water and Biosolids Corp. (Kenosha, Wisc.; www.cnp-tec.com). The technology, known as AirPrex, was initially developed at Berlin Water Works (Germany) in 2004, and was initially licensed to the German company PCS GmbH. AirPrex was subsequently implemented at three sites (two in Germany and one in the Netherlands from 2007 to 2012). Now, with the license transferred to CNP, orders to install the technology have been made for the Amsterdam West water-treatment plant in the Netherlands, as well as plants in Salzgitter and Uelzen, Germany. Several other projects are in the works in South Africa and in the U.S. AirPrex uses a reactor with an aeration system to recover the high-phosphorus mineral struvite from sludge, thus avoiding the struvite precipitation that becomes a major maintenance nuisance for water-treatment equipment. The technology simultaneously recovers a high-phosphorus byproduct that can be sold for use as slow-release fertilizer. A key feature of AirPrex is that the struvite recovery for plants using biological phosphorus…
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