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Don M Vandervelde, Glenn J Helm: Process and apparatus for a biological reactor to purify water. March 5, 1991: US04997568 (42 worldwide citation)

A system and method to remove pathogenic organisms and other suspended and dissolved containments from sewage or other contaminated water by an inexpensive, nearly maintenance free device. Principles of operation include new effective methods whioch combine synergistically, suspended and fixed film ...


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Helm Glenn J, Vandervelde Don M: Process and apparatus for a biological reactor to purify water. Helm Glenn J, Vandervelde Don M, VANDERVELDE Don M, March 21, 1991: WO/1991/003429

A system and method to remove pathogenic organisms and other contaminants from sewage or other contaminated water by an inexpensive, nearly maintenance free device. Principles of operation include methods which combine suspended and fixed film biological reactor, settling chamber, physical filter an ...



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