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Biological treatment method and device for organic wastewater

A biological treatment, 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.

Active Publication Date: 2016-04-27
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sludge reduction effect is not stable, which is the status quo
This is because a stable maintenance method for tiny animals has not yet been established

Method used

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  • Biological treatment method and device for organic wastewater
  • 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

[0052] according to image 3 The flow shown is to treat the raw water (mix fish extract, wild vegetable extract, and liquid sugar in a weight ratio of 2:2:1, and adjust the BOD to 650 mg / L). The capacity of the first biological treatment tank 1 is 2.5L, and the capacity of the second biological treatment tank 2 is 4.4L. According to the raw water supply rate of 21L / day, only the DO of the first biological treatment tank 1 is 0.01mg / L, and the second The DO of the biological treatment tank 2 is 2-3 mg / L for aeration and operation.

[0053] In addition, a sponge having an average particle diameter of 3 mm square was filled as a carrier in the first biological treatment tank 1 at a filling rate of 5%, and in the second biological treatment tank at a filling rate of 40%.

[0054] The BOD volume load relative to the first biological treatment tank is 5.5kg-BOD / m 3 / d, HRT is 3.5h, overall BOD volume load is 2.0kg-BOD / m 3 / d, HRT9.6h under the conditions of operation. The result...

reference example 1

[0056] exist image 3 50% of the excess sludge deposited in the settling tank 5 was returned to the second biological treatment tank 2, and the operation was carried out under the same conditions as in Example 1 except for prolonging the sludge residence time.

[0057] As a result, the proliferating sessile microfauna settles not on the carrier but on the returned sludge flocs, and when the flocs disintegrate with load fluctuations or steady changes, they flow out of the system. Other running results are shown in Table 1. As shown in Table 1, the average sludge conversion rate was 0.42kg-MLSS / kg-BOD. From the above results, compared with this reference example 1, the sludge conversion rate of Example 1 which does not return sludge to a 2nd biological treatment tank becomes low.

[0058] Table 1

[0059]

Embodiment 2

[0061] according to Figure 4 The shown flow process treats the same raw water as in Example 1. In this embodiment 2, a third biological treatment tank 6 with a capacity of 4 L is connected to the sedimentation tank 5 in the embodiment 1. The DO of the third biological treatment tank 6 is 2 to 3 mg / L. In addition, as in Example 1, the same carrier was filled in the first biological treatment tank 1 at a filling rate of 5% and in the second biological treatment tank 2 at a filling rate of 40%. Same as Example 1, the BOD volume load relative to the first biological treatment tank is 5.5kg-BOD / m 3 / d, HRT is 3.5h, overall BOD volume load is 2.0kg-BOD / m 3 / d, HRT9.6h under the conditions of operation.

[0062] The sludge in the tank was taken out from the third biological treatment tank 6 as excess sludge 0.4 L / d, and the excess sludge 0.4 L / d was added to the third biological treatment tank 6 from the sedimentation tank 5 . Furthermore, lecithin was added as a nutrient once ...

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Abstract

The invention stabilizes the sludge reduction effect of the multi-stage activated sludge method utilizing the predation effect of tiny animals. The organic waste water is introduced into the first biological treatment tank (1) equipped with aeration equipment, through which, for example, bacteria of the genus Alcaligenes, Pseudomonas, Bacillus, Aerobacter, Flavobacterium, etc. Usually, bacteria living in raw water oxidize and decompose 70% or more of organic components (soluble BOD), preferably 80% or more, more preferably 90% or more. The treated water from the first biological treatment tank (1) is introduced into the first biological treatment tank (2), where oxidative decomposition of residual organic components, self-decomposition of dispersed bacteria and excess sludge caused by predation by microscopic animals are carried out. Reduction. The second biological treatment tank (2) uses a fluidized bed in which the addition of the carrier C can increase the amount of microscopic animals held in the tank.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32C02F1/24C02F3/00C02F3/08C02F3/12
CPCC02F1/24C02F1/52C02F3/121C02F3/1226C02F3/327C02F2209/06C02F2209/22Y02W10/10C02F3/08C02F3/12C02F3/32
Inventor 藤岛繁树
Owner KURITA WATER INDUSTRIES LTD
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