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Method and device for biologically treating organic wastewater

A biological treatment, organic technology, applied in sustainable biological treatment, biological water/sewage treatment, processing wastewater treatment, etc., can solve problems such as deterioration and difficult operation and management of membrane separation devices, to prevent membrane occlusion and reduce drugs. Cleaning frequency and sludge reduction effect

Inactive Publication Date: 2012-11-21
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, according to the water temperature, load, and SRT (solid retention time), once the microscopic animals that prey on the flocs in the activated sludge increase sharply, it will promote the micronization of the sludge, leading to the deterioration of the treated water, and making the treated water The operation management of the membrane separation device for solid-liquid separation becomes difficult

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
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Embodiment

[0139] Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples.

[0140] [Examples and Comparative Examples of the First Invention]

Embodiment I-1

[0142] Such as figure 1 As shown, using the experimental device connecting the first biological treatment tank 1 with a capacity of 3.6L, the second biological treatment tank 2 with a capacity of 15L, the anaerobic tank 4 with a capacity of 5L, and the sedimentation tank 3 with a capacity of 5L, to carry out The treatment of organic waste water according to the present invention. Raw water contains COD Cr : 1000mg / L, BOD: 640mg / L artificial matrix.

[0143] The treatment conditions of each biological treatment tank are as follows.

[0144]

[0145] DO: 0.5mg / L

[0146] BOD volume load: 3.85kg-BOD / m 3 / d

[0147] HRT: 4 hours

[0148] pH: 7.0

[0149]

[0150] DO: 4mg / L

[0151] Carrier filling rate: 2%

[0152] HRT: 17 hours

[0153] SRT: 30 days

[0154] pH: 7.0

[0155]

[0156] ORP: -100mV

[0157] HRT (= SRT): 12 hours

[0158] In addition, a plate-shaped polyurethane foam (Polyurethane foam) is used as the carrier 12 of the second biological treatment ...

Embodiment I-2

[0162] Made by using UF membrane instead of sedimentation tank as a membrane separation device Figure 4 The experimental apparatus shown was processed under the same conditions as in Example I-1 except for this. The water quality of raw water, the treatment conditions of the first and second biological treatment tanks and anaerobic tank, and the overall BOD volume load and HRT are the same as in Example I-1.

[0163] As a result, the sludge flocs in the second biological treatment tank are dominated by filter-predatory microfauna (Vorticella: Vorticella, Bdelloida) fixed on the carrier, and the sludge conversion rate is 0.075kg- MLSS / kg-COD Cr .

[0164] Treated water (permeate water of membrane separation device) water quality, soluble COD Cr The concentration was less than 20mg / L, and during the experiment, it was always (always) in good condition. In addition, there is almost no increase in the pressure difference between the membranes, and a stable flux can be maintai...

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Abstract

Disclosed is a multi-step activated sludge method employing the predatory activity of microorganisms, which is intended to improve treatment efficiency, reduce the sludge volume, and improve treated water quality by giving priority to filtration-predatory microorganisms. Organic wastewater is introduced to a first biological treatment tank (1) and subjected to biological treatment by bacteria; a first biologically treated water that contains, in a dispersed state, the bacteria from the first biological treatment tank (1) is passed through a second biological treatment tank (2) to obtain a second biologically treated water which is then subjected to solid-liquid separation. A microorganism-supporting carrier (22) is disposed in the second biological treatment tank (2) and a portion of the sludge is removed, treated in an anaerobic tank (4), and then returned to the second biological treatment tank (2).

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 range of drainage concentration ranges such as domestic drainage, sewer water, food factories, and pulp factories. A biological treatment method and device for organic drainage that deteriorates the quality of treated water, improves treatment efficiency, and reduces the amount of excess sludge produced. Background technique [0002] The activated sludge method used in the biological treatment of organic wastewater is widely used in sewer water treatment or industrial wastewater treatment due to the advantages of good water quality and easy maintenance. However, due to the BOD volume load in the activated sludge process is generally 0.5 ~ 0.8kg / m 3 / d or so, and require a wide base area. In addition, 20 to 40% of the decomposed BOD is converted into bacteria, that is, sludge. Therefore, the treatment of a large amount of excess sl...

Claims

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Application Information

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IPC IPC(8): C02F3/12C02F3/06C02F3/30C02F3/32
CPCY02W10/10B01D65/08C02F3/06C02F3/10C02F3/121C02F3/1273C02F3/30C02F3/327C02F3/34C02F2103/28C02F2103/32
Inventor 藤岛繁树田中伦明
Owner KURITA WATER INDUSTRIES LTD