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Method and device for biologically treating organic wastewater

A biological treatment, waste water technology, applied in the direction of sustainable biological treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of inability to obtain dissolution efficiency, and achieve the prevention of excessive adhesion and efficient biological treatment Effect

Active Publication Date: 2017-10-13
KURITA INDUSTRIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the case of using a micro-bubble diffuser, the original dissolution efficiency may not be obtained

Method used

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  • Method and device for biologically treating organic wastewater
  • Method and device for biologically treating organic wastewater
  • Method and device for biologically treating organic wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] use image 3 The shown apparatus having the first biological treatment tank 10 and the second biological treatment tank 20 (equipped with a UF membrane separation device 24 ) is used to treat organic waste water. will contain COD Cr : 1000mg / L, BOD: 640mg / L artificial matrix aqueous solution prepared as simulated wastewater of easily decomposable sugary wastewater as organic wastewater (raw water).

[0086] The treatment conditions of each biological treatment tank were set as follows. The overall BOD volume load of the device is 0.73kg-BOD / m 3 / day, the overall HRT of the device is 21h.

[0087]

[0088] Capacity 105L

[0089] DO: 0.5mg / L

[0090] BOD volume load: 3.85kg-BOD / m 3 / sky

[0091] HRT: 4h

[0092] pH: 7.0

[0093]

[0094] Capacity 450L

[0095] DO: 4mg / L

[0096] Dissolved TOC sludge load: 0.01kg-dissolved TOC / kg-MLSS / day

[0097] HRT: 17h

[0098] pH: 7.0

[0099] SRT: 30 days

[0100] In the first and second biological treatment tanks, i...

Embodiment 2

[0109] Raw water was treated in the same manner as in Example 1 except that a polyethylene plate-shaped carrier (the same size as in Example 1) was used as a carrier. The results are shown in Table 1.

Embodiment 3

[0133] [embodiment 3, comparative example 5,6]

[0134] Raw water was treated in the same manner as in Example 1, except that the amount of aeration was changed (increased) as shown in Table 4. The results are shown in Table 4.

[0135] As shown in Table 4, it was confirmed that the aeration ratio (the aeration amount of the first biological treatment tank / the aeration amount of the second biological treatment tank) was preferably 1.5 to 3 times. In addition, although the aeration rate ratio of the comparative example 6 was 3 times, since the aeration rate of the 1st biological treatment tank was too much, sludge did not adhere to the 1st fixed bed, and it was difficult to treat.

[0136] [Table 4]

[0137] ◆Influence of aeration volume ratio

[0138]

[0139] (bubble diameter = 1mm)

[0140] [Example 4,5, Comparative Example 7,8]

[0141] Raw water was treated in the same manner as in Example 1 except that the distance between carriers was set as shown in Table 5. Th...

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Abstract

Provided is a method and device for biologically treating organic wastewater, wherein a fixed bed carrier is used in a first biological treatment tank (bacterial dispersion tank) so that a fixed bed can be formed without growing animalcules and thus the bacterial dispersion tank can be operated in a high load state with no fear of misoperation. Organic wastewater is supplied to a first biological treatment tank 10 and then biologically treated by bacteria therein to form a bacterial dispersion. Then, first biologically treated water containing the bacterial dispersion is passed from the first biological treatment tank 10 to a second biological treatment tank 20 and biologically treated therein. In the biological treatment tanks 10 and 20, a plurality of sheet-shaped carriers are disposed in such a manner that a face direction is arranged along the perpendicular direction. Thus, fixed beds 11 and 21 are formed and air is diffused from below the fixed bed 11 at a diffusion rate of 0.1-5 m<3>-air / m<2> bottom area / min.

Description

technical field [0001] The invention relates to a biological treatment method and device for organic wastewater, which can be used for the treatment of organic wastewater with a wide concentration range including domestic wastewater, sewage, food factories, and pulp factories, and particularly relates to a biological treatment of organic wastewater. The treatment method and device, which have more than two stages of aerobic biological treatment tanks connected in series, introduce organic wastewater into the first biological treatment tank and perform biological treatment by bacteria to generate dispersed bacteria, and treat the first biological treatment containing dispersed bacteria The water passes from the first biological treatment tank to the biological treatment tank after the second biological treatment tank for biological treatment. Background technique [0002] Known a kind of biological treatment mode, in the first biological treatment tank (distributed bacteria t...

Claims

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Application Information

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IPC IPC(8): C02F3/12C02F3/06C02F3/34
CPCC02F3/06C02F3/12C02F3/34Y02W10/10C02F3/10C02F3/20
Inventor 藤岛繁树
Owner KURITA INDUSTRIAL CO LTD
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