Process for the biological purification of waste water

Erik Bundgaard Hansen (Inventor), Gert Holm Kristensen (Inventor), Erik Arvin (Inventor)

Research output: Patent

Abstract

Process for the biological purification of waste water by the activated sludge method, the waste water being mixed with recirculated sludge and being subjected to an anaerobic treatment, before the waste water thus treated is alternately subjected to anoxic and aerobic treatments and the waste water thus treated is led into a clarification zone for settling sludge, which sludge is recirculated in order to be mixed with the crude waste water. As a result, a simultaneous reduction of the content both of nitrogen and phosphorus of the waste water is achieved.
Original languageEnglish
Patent number3427310 C2
Filing date30/09/0002
CountryGermany
Publication statusPublished - 1992

Cite this

Hansen, E. B., Kristensen, G. H., & Arvin, E. (1992). Process for the biological purification of waste water. (Patent No. 3427310 C2).