 Elastomer screen units for shaker-screen bodies |
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| Enzymatic reagent system for total cholesterol assay using oxygen-rate method |
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| Photochromic boro-silicate glass |
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| Diol-containing renin inhibitors |
| The following table provides a dictionary of the terms used in the description of the invention.
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| Antitumor agent containing Lactobacillus casei YIT 9018 |
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| Glass composition for alkali-resistant glass fiber |
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| Support matrices for immobilized enzymes |
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| Method of producing microbial cells from methane |
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| Process for the preparation of L-car-bamyl-amino acids and of the corresponding L-amino acids |
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Method and unit for wastewater treatment by microorganisms
| Details |
Inventors: Kuriyama, Kiyoshi; Sato, Munetaka; Matsuzaki, Tsuneo; Honma, Masanori; Shida, Seiji;
Assignee: Niigata Engineering Co., Ltd. (Tokyo, JP)
Primary Examiner: Castel; Benoit
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Rothwell, Mion, Zinn and Macpeak
A method and a unit for wastewater treatment with microorganisms, in which at least one non-woven fibrous mat having a three-dimensional network structure is disposed as a supporting media in an aeration tank, microorganisms are retained on the surface of and in the interstices of the non-woven fibrous mat, and organic polluting matter in the wastewater is oxidatively decomposed by the microorganisms in the presence of oxygen. |
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DETAILED DESCRIPTION OF THE INVENTION The wastewater which can be treated in this invention comprises aqueous liquids which contain organic matter oxidatively decomposable by activated sludge in the presence of oxygen, such as industrial wastes containing organic compounds, and the supernatant liquid resulting after domestic wastewater is passed through a sedimentation tank.
The non-woven mat used in this invention, as shown in FIG.
1, is a non-woven mat which is obtained by processing synthetic fibers by heating them to cause the fiber to curl, arranging the curled fibers in a web or mat shape, and coalescing the fibers to one another using a bonding agent (e.
g.
, of the same material as the fibers) or by melt adhesion upon heating, to form the curled fibers into a mat form.
The non-woven mat has a three-dimensional network structure with the constituent fibers being intertwined irregularly, and with interstices having a large volume (e.
g.
, about 60 to 99% by volume).
One example of such a non-woven mat is commercially available under the tradename Saran Lock (a product of Dow Chemical).
Any synthetic fibers which are water proof, have superior physical and chemical properties and can be processed into the network structure described above can be used in the present invention.
Examples of such fibers are fibers of nylon, polyvinylidene chloride, polyvinyl chloride, and polyesters.
Fibers of metals having good corrosion resistance and rust resistance such as stainless steel can also be used.
The thickness of the fibers is generally about 50 to about 4,000 denier.
If the thickness of the fibers is larger than about 4,000 denier, the retention of microorganisms on the three-dimensional network structure becomes somewhat poor, and the retaining microorganisms tend to be sloughed off due to the flow of the wastewater.
If the thickness of the fibers decreases below about 50 denier, the strength of the fibers sometimes becomes too weak.
The preferred thickness range is 100 to 2,000 denier, and the more preferred thickness range is 800 to 1,800
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Molecular Biology 
