Method and apparatus for biological treatment of organic of organic wastewater

A biological treatment and organic technology, applied in sustainable biological treatment, biological water/sewage treatment, water treatment parameter control, etc., can solve the problems of unstable sludge reduction effect and no stable maintenance method for small animals.
CN101500950AActive Publication Date: 2009-08-05KURITA WATER INDUSTRIES LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
KURITA WATER INDUSTRIES LTD
Publication Date
2009-08-05

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Abstract

An effect of reducing sludge amount in a multiple-stage activated sludge method utilizing the predation action of animalcules is stabilized. Organic wastewater is introduced into a first biological treatment tank 1 equipped with aeration means and 70% or more of, preferably 80% or more of, further more preferably 90% or more of the organic components (soluble BOD) is oxidatively decomposed by a common bacterium present in raw water such as Alcaligenes, Pseudomonas, Bacillus, Aerobacter, or Flavobacterium. The treated water in the first biological treatment tank 1 is introduced into a second biological treatment tank 2 and the reduction of the amount of excess sludge is conducted by the oxidative decomposition of remaining organic components, the autolysis of dispersive bacteria and the predation by animalcules. In the second biological treatment tank 2, a fluid bed in which a support C is added so as to increase the holding capacity of the animalcules in the tank is used.
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Description

technical field

[0001] The present invention relates to a biological treatment method and device for organic drainage that can be used in a wide concentration range of organic drainage including domestic drainage, groundwater, food factories, and pulp factories. Next, a biological treatment method and device for organic wastewater that can improve treatment efficiency and reduce excess sludge production. Background technique

[0002] The activated sludge method used in the biological treatment of organic drainage is widely used in groundwater treatment or industrial wastewater treatment due to its advantages such as good water quality and easy maintenance. However, the BOD volume load used in operation is 0.5~0.8kg / m 3 / d or so, so a large land area is required. In addition, since 20 to 40% of the decomposed BOD is transformed into bacteria, that is, sludge, a large amount of excess sludge treatment also becomes a problem.

[0003] A carrier-added fluidized bed method is ...

Claims

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