发明名称 |
Water Clarifier with First Filtrate Isolation, Improved Backwashing and Improved Bubble Generation |
摘要 |
<p>A two stage raw water clarifier with first stage flotation and second stage filtration divides at least the lower portion of a flotation tank into independent cells. A branched slotted conduit located in a filter medium in each cell collects clarified water. Valves control the flow of clarified water from each branched conduit either to a clarified water ring conduit or to a first filtrate/backwash ring conduit connected to a storage tank. The filter media is preferably a dual media, a layer of anthracite or activated carbon over a layer of sand. High cell walls and inclined baffles in each cell retain the filter media during backwashing. The baffles also slow the flotation process. A decompression valve for pressurized water with dissolved air has a very narrow annular slot in the flow path through the valve to create microscopic air bubbles of optimal size for the flotation. A movable member sets this annular slot at a proper value. A mechanical or pneumatic actuator moves the member periodically to open the slot and flush out trapped particles.</p> |
申请公布号 |
CA2136200(A1) |
申请公布日期 |
1993.11.25 |
申请号 |
CA19932136200 |
申请日期 |
1993.05.17 |
申请人 |
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发明人 |
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分类号 |
C02F1/52;B01D21/00;B01D21/24;B01D24/00;B01D24/02;B01D29/46;B01D29/62;B01D29/66;B01D35/12;B01D36/00;B01D37/03;B03B13/00;B03D1/14;C02F1/00;C02F1/24;C02F101/00;C02F103/02;C02F103/04;C02F103/28 |
主分类号 |
C02F1/52 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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