Diffusion element with boundary zone treatment

Details Diffusion element with boundary zone treatment Diffusion element with boundary zone treatment

1978-10-19

1981-04-14

Lutter, Frank W.

Gas and liquid contact apparatus

Contact devices

Liquid tank

239 34, 239 49, 239145, 261 94, 261124, 106 40R, B01F 304, C02F 172

Patent

active

042619327

ABSTRACT:
Gas diffusion elements, formed of a body of solid particles which have been shaped, pressed and rendered coherent by bonding or sintering in a compacted form having pores, and having an enhanced apparent volumetric compression ratio in a central zone and in a boundary zone thereof, are disclosed. Such elements have a generally horizontal portion including an upper gas discharge surface having a bubble release pressure in water, by a test disclosed herein, in the range of about 2 to about 20 inches of water. Among the preferred embodiments is an element whose gas discharge surface has the property that its coefficient of variation is not greater than about 0.25, based on the values of bubble release pressure at a plurality of points over said surface. Such elements may provide improved gas, e.g. oxygen, transfer efficiency, and therefore hold promise of improving the efficiency and economics of gas transfer processes, such as for instance treatment of sewage or other wastewater with air, oxygen and/or ozone.

REFERENCES:
patent: 1117601 (1914-11-01), Porter
patent: 1223033 (1917-04-01), Cole
patent: 1362370 (1920-12-01), Terry, Jr.
patent: 1988478 (1932-07-01), Broadwell
patent: 3103254 (1963-09-01), Stedman
patent: 3768788 (1973-10-01), Candel
patent: 3997634 (1976-12-01), Downs
patent: 4046845 (1977-09-01), Veeder

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