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Biological treatment method and apparatus for organic wastewater

A biological treatment and organic technology, applied in the direction of biological treatment equipment, biological sludge treatment, sustainable biological treatment, etc., can solve the problem of not being able to use multi-stage activated sludge method

Inactive Publication Date: 2011-08-03
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, "aggregate predatory microfauna" that bite and prey on bacteria has the effect of improving the effect of sludge reduction, but because it disintegrates the flocculation, it has the disadvantage of clouding the treated water, and cannot be used in the existing Used in multi-stage activated sludge process

Method used

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  • Biological treatment method and apparatus for organic wastewater
  • Biological treatment method and apparatus for organic wastewater
  • Biological treatment method and apparatus for organic wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0065] Such as image 3 As shown, the first biological treatment tank (activated sludge tank (no sludge return)) 1A with a capacity of 3.6 L, the second biological treatment tank (activated sludge tank) 1B with a capacity of 15 L, the sedimentation tank 2, An experimental device connected to a sludge treatment tank 3 with a capacity of 3 L was used to treat the organic waste water of the present invention. A immersion membrane 4 with a pore diameter of 10 μm was installed in the sludge treatment tank 3 . The pH of the first biological treatment tank 1A and the second biological treatment tank 1B was adjusted to 6.8, and the pH of the sludge treatment tank 3 was adjusted to 5.0. The sludge in the separated sludge of the settling tank 2 was sent to the sludge treatment tank 3 at 0.5 L / d, and the other sludge was returned to the second biological treatment tank 1B. The excess sludge was extracted from the sludge treatment tank 3 at 0.2 L / d, and the permeate passing through the ...

Embodiment 2

[0068] Such as figure 1 As shown, the organic wastewater treatment of the present invention is carried out using an experimental device that connects a biological treatment tank (activated sludge tank) 1 with a capacity of 15 L, a sedimentation tank 2, and a sludge treatment tank 3 with a capacity of 3 L. . A immersion membrane 4 with a pore diameter of 10 μm was installed in the sludge treatment tank 3 . The pH of the biological treatment tank 1 was adjusted to 6.8, and the pH of the sludge treatment tank 3 was adjusted to 5.0. The sludge in the separated sludge of the sedimentation tank 2 was sent to the sludge treatment tank 3 at 0.5 L / d, and the other sludge was returned to the biological treatment tank 1 . The excess sludge was extracted from the sludge treatment tank 3 at a rate of 0.36 L / d, and the permeate passing through the immersion membrane 4 was sent to the biological treatment tank 1 at a rate of 0.14 L / d. In this sludge treatment tank 3, lecithin was added on...

Embodiment 3

[0071] Except in Example 1, a part of the treatment liquid of the first biological treatment tank 1A was concentrated by centrifugation at a speed of 12000 rpm for 5 minutes, and the concentrate was added to the sludge treatment tank 3 at 105 mg-COD / d ( The ratio of 5% of the COD of the separated sludge) is added in the sludge treatment tank 3 (and, the diluent generated by concentration is sent to the second biological treatment tank 1B.), in addition, under the same conditions Under the treatment, the sludge conversion rate was 0.08kg-MLSS / kg-BOD. The BOD of the treated water (the supernatant from the precipitation tank 2) was below the detection limit.

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Abstract

In the single active sludge tank method or the multistage active sludge method with the use of the predation action of animalcules, it is intended to further elevate the treatment efficiency and reduce the excessive sludge generation. A biological treatment method which comprises feeding organic discharged water into a first biological treatment tank (1A), biologically treating it with bacteria, then supplying the thus treated water containing the bacteria from the first biological treatment tank (1A) to a second biological treatment tank (1B), and subjecting the treated water from the secondbiological treatment tank (1A) to solid / liquid separation. In this method, a portion of the treated water from the second biological treatment tank (1B) and / or at least a portion of the separated sludge are fed into a sludge treatment tank (3) provided with a submerged membrane (4) which has a pore diameter of from 5 to 100 [mu]m and subjected to an aerobic biological treatment. Next, the liquid permeating through the submerged membrane (4) is returned into the first biological treatment tank (1A) and / or the second biological treatment tank (1B). In the sludge treatment tank (3), the sludge is reduced by the animalcules and the residual fine components are allowed to permeate through the submerged membrane (4) and returned into the tank (1B) containing filtration predation type animalcules followed by predation. Thus, it becomes possible to establish both of an effect of largely reducing the sludge and another effect of imparting favorable qualities of the treated water.

Description

technical field [0001] The invention relates to a method and a device for biological treatment of domestic waste water, sewage, organic waste water from food factories or paper mills and the like. Background technique [0002] The activated sludge method used in the biological treatment of organic wastewater is widely used in sewage treatment or industrial wastewater treatment due to the advantages of good water quality and easy maintenance. However, the BOD volume load in the activated sludge process is 0.5-0.8kg / m 3 / d or so, thus requiring a large footprint. In addition, 20% of the decomposed BOD is converted into bacterial cells, that is, sludge, and the treatment of a large amount of excess sludge is also a problem. [0003] For high-load treatment of organic waste water, a fluidized bed method in which a carrier is added is known. When using this method, it is possible to 3 / d above the BOD volume load to work. However, this method has a disadvantage that the amou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12C02F1/44C02F11/02
CPCC02F3/10B01D2315/06C02F11/00C02F2305/06C02F2303/06C02F1/38C02F2103/28C02F3/1273C02F3/085C02F3/1221C02F3/121C02F2103/32C02F2203/004C02F2209/06C02F3/32Y02W10/10
Inventor 藤岛繁树
Owner KURITA WATER INDUSTRIES LTD