Stock material or miscellaneous articles – Three or more coplanar interfitted sections with securing means
Patent
1987-12-04
1990-05-29
McCamish, Marion C.
Stock material or miscellaneous articles
Three or more coplanar interfitted sections with securing means
156265, 210150, 210151, 210488, 210605, 210610, 210611, 210615, 428 77, 428115, 428190, B01D 3904, C02F 304
Patent
active
049294849
ABSTRACT:
Filling material for percolating filters for the treatment of liquid and process for producing and assembling the material. Especially in biological sewage treatment, filling material must provide the best possible hold for the biological filter film necessary for the purpose and must have uniform wettability. The disadvantage of known apparatuses meeting these requirements is that they either tend to clog or are difficult to produce. The new filling material will work effectively and reliably, while being simple to produce and assemble. To provide ideal growth surfaces for the biological filter film, the filling material has a plurality of plastic strips (20) which are connected to one another by means of a single holding sheet (21). Furthermore, the strips (20) have a special shape, in particular corrugated edges and/or a structured neutral region. The filling material is especially suitable for biological treatment, particularly the denitrification of sewage or drinking water.
REFERENCES:
patent: 4294694 (1981-10-01), Coulthard
McCamish Marion C.
Norddeutsche Seekabelwerke AG
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