Liquid purification or separation – With gas-liquid surface contact means – With separator
Patent
1993-12-30
1995-07-04
Upton, Christopher
Liquid purification or separation
With gas-liquid surface contact means
With separator
2101951, 210618, C02F 306
Patent
active
054297400
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for purifying waste water, in particular for removing organic waste material therefrom through biological fermentation, as known from EP-A-0 356 870.
The device according to the invention comprises a reservoir, supply means for the waste water flowing out into the reservoir, means for maintaining a pre-determined fluid level in the upper portion of the reservoir, means for draining off purified water from the reservoir, said reservoir forming part of a cycle of microbe supporting elements having a density lower than 1, comprising elements operative above the pro-determined level for removing the microbe supporting elements from the reservoir, cleaning means for removing sludge from the supporting elements, and re-introducing means flowing out near the bottom of the reservoir for the cleaned microbe supporting elements.
Microbe cultures grow on the microbe supporting elements that decompose the organic waste matter. After the microbe supporting elements have remained in the reservoir for a certain period of time the supporting elements are covered with decomposition products in the form of sludge. Because the supporting elements have a lower density than 1 these will be pushed up to the top of the reservoir above the pre-determined fluid level by the supporting elements underneath in the fluid. Before the supporting elements are taken out of the reservoir these will be out of the fluid for some time and the adhering fluid will drip down. The relatively dry microbe supporting elements will then be taken out of the reservoir and the sludge will be removed therefrom in the cleaning means. Hence the released sludge has a relatively low water content and can be transported off in an economic way. After having passed the cleaning means the microbe supporting elements will for the most part be without any sludge but will still carry a large quantity of microbes. As soon as the supporting elements have been fed back into the reservoir, they can become immediately active.
For a correct guiding of the microbe supporting elements in the upper part of the reservoir preferably the measure of claim 2 is adopted.
A favourable further development of the device according to the invention is characterized in claim 3. While the microbe supporting elements stay in the reservoir, the purified water enters the toptank through the holes. The purified water is removed from the toptank.
Herewith preferably the measure of claim 4 is adopted. If along with the purified water coming out of the reservoir into the toptank loose sludge particles are carried along, these will deposit in the toptank. By regularly opening the valve in the sludge outlet the deposited sludge is removed from the toptank and again brought into the lower part of the reservoir along with the waste water. Accordingly it is ensured that the drained off purified water is sufficiently free from loose particles.
In order to take care that the microbe supporting elements remain relatively dry in the cycle between the removing means and re-introducing means, so that the sludge may be carried off relatively dry, the measure of claim 5 is adopted. Any water possibly released from the sluice can be simply led back into the waste water supply means.
Because of the lifting power of the microbe supporting elements these will automatically "flow" out of the top of the reservoir. In order to control the duration of stay of the microbe supporting elements for an optimum working of the device according to the invention preferably the measure of claim 6 is adopted.
The device is in particular suited for an aerobe purification process. For that purpose the measure of claim 7 is adopted. An extra advantage is that because of the air brought in air bubbles will adhere to particle-shaped organic waste matter, which will cause these particles to quickly rise to the pre-determined level in the reservoir. There these particles will be carried off by the upward flow of microbe supporting elements and will be directly separated in the cleaning means. Thus
REFERENCES:
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patent: 4940546 (1990-07-01), Vogelpohl et al.
patent: 5019268 (1991-05-01), Rogalla
Patent Abstracts of Japan, vol. 10, No. 56 (C-331) (2113), Mar. 6, 1986, & JP-A-60 197 295, (Denka Engineering), Oct. 5, 1985.
Patent Abstracts of Japan, vol. 6, No. 3, (C-86) (881), Jan. 9, 1982, & JP-A-56 129 087, (Kubota Tekko K.K.), Oct. 8, 1981.
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