发明名称 |
PROCESS FOR CONTROLLING A FILTER DEVICE FOR THE PURIFICATION OF CONTAMINATED AND IN PARTICULAR NITRATES CONTAINING LIQUID |
摘要 |
<p>Method for controlling a filter device for the purification of a contaminated, and in particular nitrates-containing, liquid such as industrial waste water or groundwater, which device comprises a standing vessel, the lower part of which has a downward narrowing inner wall, which vessel serves to receive a granular filter-bed, for instance in the form of a sand-bed, in addition to a pump tube standing in the filter-bed and having arranged therein a stand-pipe controllably fed with a gaseous medium such as air, a washer for the sand supported by the tube and situated above the filter-bed and a tube assembly debouching close to the bottom for supplying the liquid for filtering and cleaning, wherein the air supply in the stand-pipe is controlled such that a constant ratio is maintained between a value of the filter-bed resistance to be measured momentarily and the desired resistance thereof, wherein the desired resistance value is predetermined from the clean-bed resistance at a determined liquid flow rate.</p> |
申请公布号 |
WO9839255(A1) |
申请公布日期 |
1998.09.11 |
申请号 |
WO1998NL00022 |
申请日期 |
1998.01.12 |
申请人 |
ASTRACO BEHEER B.V.;ASSEN, HARRY;WOUTERS, JOHANNES, WILHELMUS |
发明人 |
ASSEN, HARRY;WOUTERS, JOHANNES, WILHELMUS |
分类号 |
C02F3/12;C02F3/28;(IPC1-7):C02F3/12 |
主分类号 |
C02F3/12 |
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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