Liquid purification or separation – Flow – fluid pressure or material level – responsive
Patent
1997-07-08
1999-04-20
Wyse, Thomas G.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
210150, 210194, 210205, 210216, 210268, 210618, C02F 304, B01D 5385
Patent
active
058955674
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for cleaning organic waste material from waste fluid, such as known from FR-B-2583406.
The known apparatus comprises a container at least partially filled with carrier elements. Waste water is guided along these carrier elements. On the carrier elements develop micro-organisms which process the organic material in the waste water so that the water is cleaned.
With the invention an apparatus of this type is obtained which functions effectively for cleaning at leaste waste air and with which the sludge formed from the organic waste material by the micro-organisms can be efficiently removed.
In the apparatus according to the invention the cleaning action of the micro-organisms takes place while the carrier elements are at rest. This creates optimum conditions for the development and action of these micro-organisms. The formed sludge is drained periodically by setting into operation the carrier circulation means. The movement of the carrier elements caused by these means releases the excess sludge and this can be discharged via the sediment outlet. The apparatus can be dimensioned for instance such that the purifying action of the micro-organisms can take place throughout the working week, while discharge of sludge takes place by setting the carrier circulation means into operation during the weekend. During normal operation of the apparatus the carrier elements are only moistened by means of the water-sprinkling device and the air to clean can flow freely along the carrier elements. In order to discharge the formed sludge the container is filled with water by means of the water transporting means, whereafter the pump can be switched on to pump round the carrier elements to thereby dislodge the formed sludge and enable its discharge via the sediment outlet.
A further development, where the pump outlet debouches in the top of the container above a guide surface provided with apertures, below which is arranged a water collecting element connected to the sediment drain. The carrier elements are poured onto the guide surface together with the water with which they are being transported. The transporting water together with the released sludge absorbed therein flows through the apertures in the guide surface into the water collecting element and from there to the sediment outlet. The cleaned carrier elements are moved from the guide surface onto the top of the carrier elements in the container.
In another embodiment, the guide surface takes a form sloping toward an end edge. The carrier elements slide or roll, depending on their shape, over the sloping guide surface to the end edge and fall therefrom onto the carrier elements already present in the container.
In another favorable feature the carrier elements have a specific mass lower than that of water and the pump inlet debouches in the top of the container and the pump outlet in the bottom of the container. Because the pump outlet debouches in the bottom of the container, the dislodged sludge is likewise released in the bottom of the container. This dislodged sludge can settle in the bottom of the container and be drained immediately or later via the sediment outlet. The carrier elements released from the pump outlet move upward of themselves due to the buoyant force resulting from their lower specific weight.
A preferred apparatus for cleaning organic waste material from waste air and waste water comprises a container at least partially filled with carrier elements, a waste water feed debauching into the top of the container, a water outlet connected to the bottom of the container, level control means for defining an intermediate level in the container and maintaining a free water surface at the intermediate level, a waste air feed debauching close to the intermediate level in the container, an air outlet in the top of the container. The apparatus also has carrier circulation means comprising a pump for pumping round water with carrier elements taken up therein, a pump inlet and outlet respectively at the top and at the bot
REFERENCES:
patent: 4076616 (1978-02-01), Verde
patent: 4800021 (1989-01-01), Desbos
patent: 5298164 (1994-03-01), Hapach et al.
patent: 5372712 (1994-12-01), Petit
patent: 5494574 (1996-02-01), Unterman et al.
patent: 5573671 (1996-11-01), Klein
Patent Care B.V.
Wyse Thomas G.
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