Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Patent
1997-01-28
1999-11-30
Cintins, Ivars
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
210807, B01D 3704
Patent
active
059936720
ABSTRACT:
An intermittently operating slow sand filter uses the damming of water in a raised pipe to provide a constant level of water in a slow sand filter container. The container includes a water inlet and outlet, and is partially filled with sand or other filter material. A pipe from the water outlet in the slow sand filter is raised upward to the desired level of water over the sand before descending to a water reservoir. Water backs up in the pipe and the container to the desired level above the top of the sand, even when the flow of water is intermittent. The schmutzdeuke forms at the top of the filter medium. The water level in such a manually operated slow sand filter, using fine quartz sand as the filter medium, and at ambient temperatures (about 21.degree. C.) is maintained above about 1 cm above the top of the filter medium and below about 8 cm above the top of the slow sand filter.
REFERENCES:
patent: 3817378 (1974-06-01), Ross
patent: 4765892 (1988-08-01), Hulbert et al.
patent: 5032261 (1991-07-01), Pyper
Slow Sand Filtration, L. Huisman, W.E. Wood, World Health Organization, Geneva, 1974, 32 pages.
Slow Sand Filtration for Community Water Supply, J.T. Visscher, R. Paramasivam, A. Raman, H.A. Heijnen, Technical Paper No. 24, International Reference Centre for Community Water Supply and Sanitation, The Hague, The Netherlands, 32 pages, 1987.
Intermittently Operated Slow Sand Filtration: A New Water Treatment Process by Byron James Buzunis, Department of Civil Engineering, The University of Calgary, Mar., 1995, 220 pages.
Report on the UTI Funded Research Project on the Intermittently Operated Slow Sand Filter, University of Calgary, Canada, Dec. 1997 (unpublished).
Effect of Intermittent Operation of Slow Sand Filters on Filtered Water Quality, Paramasivam, R, et al, Indian Journal Of Environmental Health, vo. 22, No. 2, 136-150, 1986.
Cintins Ivars
Lambert Anthony R.
University Technologies International Inc.
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