Biological treatment method and device for organic wastewater

A biological treatment and organic technology, applied in the direction of sustainable biological treatment, biological water/sewage treatment, water treatment parameter control, etc., can solve the problem of large footprint, achieve improved solid-liquid separation, and improve treatment efficiency Effect

Active Publication Date: 2016-03-30
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the BOD volume load of the activated sludge method is generally 0.5-0.8kg / m 3 / day or so, thus requiring a large footprint

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Such as figure 1 As shown, the organic wastewater treatment of the present invention was carried out using an experimental device connecting a first biological treatment tank 1 with a capacity of 36 L, a second biological treatment tank 2 with a capacity of 150 L, and a sedimentation tank 3 with a capacity of 50 L. Raw water contains COD Cr : 2000mg / L, BOD: 1280mg / L artificial matrix.

[0068] The treatment conditions of each biological treatment tank are as follows:

[0069]

[0070] DO: 0.5mg / L

[0071] BOD volume load: 7.7kg-BOD / m 3 / sky

[0072] HRT: 4 hours

[0073] pH: 7.0

[0074]

[0075] DO: 4mg / L

[0076] Carrier filling rate: 2%

[0077] HRT: 17 hours

[0078] SRT: 25 days

[0079] pH: 7.0

[0080] As the carrier 22 of the second biological treatment tank 2, plate-shaped polyurethane foam (100cm×30cm×1cm / 1 block) is used, and the bottom and left and right sides fixed on the tank wall.

[0081] Also, the BOD volume load of the whole device is ...

Embodiment 2

[0089] As raw water, use COD containing Cr : 670mg / L, BOD: 430mg / L artificial matrix, relative to the BOD volume load of the first biological treatment tank: 2.6kg-BOD / m 3 / day, the overall BOD volume load is: 0.5kg-BOD / m 3 / day (0.78kg-COD Cr / m 3 / day), HRT21 hours, the soluble BOD sludge load of the sludge in the second biological treatment tank relative to the tank is 0.025kg / kg-MLSS / day, operates with the above-mentioned conditions, in addition, with embodiment 1 Treated under the same conditions.

[0090] As a result, the sludge flocs in the second biological treatment tank and the filter-predatory microfauna (bellworms, bdelloids) fixed on the carrier are prioritized, and the sludge conversion rate is 0.08kg-MLSS / kg-COD Cr . The treated water is soluble COD Cr The concentration is less than 30mg / L, and SS is less than 10mg / L. During the test, it always maintains a good condition.

Embodiment 3

[0096] As raw water, use COD containing Cr : 6700mg / L, BOD: 4350mg / L artificial matrix, relative to the BOD volume load of the first biological treatment tank: 17.5kg-BOD / m 3 / day, overall BOD volume load: 5kg-BOD / m 3 / day, the first biological treatment tank HRT6 hours, the second biological treatment tank HRT15 hours, the carrier filling rate of the second biological treatment tank 5%, SRT50 days, the soluble BOD sludge of the second biological treatment tank relative to the sludge in the tank The load was 0.05 kg / kg-MLSS / day, and the operation was performed under the above-mentioned conditions, and the treatment was performed under the same conditions as in Example 1 except that.

[0097] As a result, the sludge flocs in the second biological treatment tank and the filter-predatory microfauna (bellworms, bdelloids) fixed on the carrier were prioritized, and the sludge conversion rate was 0.09kg-MLSS / kg-COD Cr . The treated water is soluble COD Cr The concentration is l...

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Abstract

By means of a multi-stage active sludge method that uses the feeding effect of microorganisms, when performing a high load process of a CODCr volume load of at least 1.0 kg / m3 / d or a BOD volume load of at least 0.5 kg / m3 / d, the proliferation of agglutination feeding microorganisms that cause a deterioration of processed water quality is suppressed and filter feeding microorganisms are actively prioritized, aiming to increase the processing efficiency and processed water quality and to reduce the volume of sludge. Organic wastewater is introduced to a first biological treatment tank (1) and is biologically treated by bacteria; first biologically treated water containing bacteria in a dispersed state from the first biological treatment tank (1) is passed to a second biological treatment tank (2), obtaining second biologically treated water; the second biologically treated water is subjected to solid / liquid separation at a settling tank (3); and the separated water is returned to the second biological treatment tank (2). A microfauna hold-back carrier (22) is provided to the second biological treatment tank (2).

Description

technical field [0001] The invention relates to a biological treatment method and device for organic drainage, which can be used for the treatment of domestic drainage, sewage, and organic drainage in a wide range of concentrations, especially from food factories or pulp factories. A biological treatment method and device for organic drainage with treatment efficiency and reduction of excess sludge generation. Background technique [0002] The activated sludge method used in the biological treatment of organic wastewater is widely used in dirty water treatment or industrial wastewater treatment due to its advantages of good water quality and easy maintenance. However, the BOD volume load of the activated sludge method is generally 0.5-0.8kg / m 3 / day or so, thus requiring a large footprint. In addition, 20 to 40% of the decomposed BOD is converted into bacteria, that is, sludge, so a large amount of excess sludge is produced. [0003] A fluidized bed method in which a carr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12C02F3/06C02F3/32
CPCC02F3/06C02F3/121C02F2103/32C02F2209/001C02F2209/08C02F2303/06Y02W10/10C02F3/12C02F3/32
Inventor 藤岛繁树
Owner KURITA WATER INDUSTRIES LTD
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