Liquid purification or separation – With gas-liquid surface contact means – With separator
Patent
1998-03-09
2000-01-18
Upton, Christopher
Liquid purification or separation
With gas-liquid surface contact means
With separator
210256, 210393, 210501, 210616, C02F 302
Patent
active
06015490&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a carrier-separating and liquid-collecting mechanism for use in a liquid-waste treatment apparatus for biologically treating organic liquid-waste, such as sewage, human excrement and industrial liquid-waste, utilizing carriers having microorganisms immobilized thereon.
2. Description of Related Art
In recent years, as liquid-waste treatment techniques, an activated sludge method, a biomembrane method and an immobilized microorganism method have been known. From the viewpoint of efficient utilization of land, it has been desired to develop a liquid-waste treatment method which is space-saving, and a method for an aerobic treatment of liquid-waste utilizing carriers having microorganisms immobilized thereon and an improvement of performance of those carriers have attracted attention. The present inventors have been working on the development of an apparatus for biologically treating liquid-waste utilizing microorganism-immobilized carriers, and have encountered the below-mentioned technical problems during a process of the development.
That is, when microorganism-immobilized carriers flow through a treatment tank, together with a liquid to be treated, the concentration of carriers near an outflow end of the treatment tank becomes high, so that scum and contaminants (impurities) adhere to a carrier-separating and liquid-collecting mechanism in the form of a screen disposed at the outflow end of the treatment tank, thereby increasing the liquid level in the treatment tank. Consequently, the treatment tank must be cleaned intermittently, by using industrial water and the like. Thus, in the above-mentioned treatment tank, the treatment performance is lowered because a uniform distribution of the carriers cannot be maintained, and a blockage of the outflow end of the treatment tank occurs.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a carrier-separating and liquid-collecting mechanism which is free from the above-mentioned technical problems and which is capable of positively maintaining microorganism-immobilized carriers in the treatment tank. It is another object of the present invention to suppress an increase in liquid level in the treatment tank due to adhesion of scum and impurities to the carrier-separating and liquid-collecting mechanism at the outflow end of the treatment tank. It is a further object of the present invention to render unnecessary a cumbersome operation for the removal of scum and impurities from the carrier-separating and liquid-collecting mechanism.
According to the present invention, in a liquid-waste treatment apparatus having a treatment tank in which carriers having microorganisms immobilized thereon are suspended, a carrier-separating and liquid-collecting mechanism comprising a cylindrical screen and a liquid-collecting collecting means covered with the cylindrical screen is provided, such that the axis of the cylindrical screen extends in a substantially horizontal direction. The liquid-collecting means is capable of collecting a liquid at a plurality of positions in the cylindrical screen. Illustratively stated, the liquid-collecting means comprises a pipe or a gutter having liquid-collecting holes. The liquid-collecting holes are a large number of small holes or narrow openings extending in the direction of the axis of the liquid-collecting means.
With respect to the cylindrical screen, it may be fixed in the treatment tank. However, it is preferred that the cylindrical screen be adapted to be rotated on the axis thereof by a rotation mechanism and be engaged with a screen brush which is fixed so as to be in parallel to and contact with the cylindrical screen. It is preferred that the rotation mechanism be capable of intermittently rotating the cylindrical screen. It is preferred that a surface of the cylindrical screen be covered with a bactericidal substance or an algicidal substance.
The carrier-separating and liquid-collecting mechanism is disposed so as to p
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Concurrently filed U.S. Patent Application corresponding to PCT/JP96/01365, Filed May 23, 1996, entitled "Method for Aerobically Treating Liquid-Waste and Treatment Tank" by Noboru Katsukura et al.
Katsukura Noboru
Tochikubo Eiji
Yamada Takehiko
Ebara Corporation
Upton Christopher
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