Method and apparatus for reducing sludge amount

A technology of sludge and activated sludge, which is applied in the direction of sludge treatment, oxidation treatment sludge, chemical instruments and methods, etc., can solve the problems of reduced bactericidal power, etc., and achieve the goals of reducing pH value, increasing available chlorine concentration, and load suppression Effect

Inactive Publication Date: 2012-04-25
イーエステクノロジー
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason for this is presumed to be that if the reaction lasts for more than 5 minutes, free chlorine with high bactericidal power will be reliably consumed, and the returned hypochlorous acid will be in a state of combined chlorine, or in a previously unknown state combined with sludge, and the bactericidal power will be reduced. fully reduce

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  • Method and apparatus for reducing sludge amount
  • Method and apparatus for reducing sludge amount
  • Method and apparatus for reducing sludge amount

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Whether the aqueous solution formed by premixing dilute hydrochloric acid and sodium hypochlorite aqueous solution, that is, the biological mother solution (biomaster) is injected into the sludge, and the dilute hydrochloric acid and sodium hypochlorite aqueous solution are respectively injected, and whether the effect of matrixing of the sludge is confirmed. Experiments with differences.

[0062] Biological mother liquor is prepared according to the following method, the method is: a specified amount of 8.5% dilute hydrochloric acid is mixed with a specified amount of 12% sodium hypochlorite aqueous solution, and then diluted with water, the pH value is 6, and the concentration of available chlorine is 4000mg / L.

[0063] Add the activated sludge with a sludge concentration of 15300mg / L to the four containers A1, A2, A3, and A4 according to the specified amount. Next, into the sludge in the container A1 and the container A2, the biological mother liquors whose availab...

Embodiment 2

[0067] For the case of injecting biological mother liquid into the sludge, and the corresponding occasion of injecting dilute hydrochloric acid and sodium hypochlorite aqueous solution respectively, conduct a batch test of treating raw water collected from the sewer to investigate whether the sludge reduction rate has an effect Experiment with differences.

[0068] Equipped with 3 aeration tanks ×1, ×2, ×3, add the same amount of activated sludge respectively, and add raw water taken from the sewer according to the method of 180L respectively. After performing aeration in each of the aeration tanks ×1, ×2, and ×3 for 21 hours, the aeration was stopped, and the sludge was allowed to settle. After settling, the supernatants were removed from the aeration tanks ×1, ×2, ×3, ie, the water was not treated, leaving only 50 L of sludge in each tank. Take out 10L of sludge from the aeration tank × 2, take it into the container Y2, add the biological mother solution with an available c...

Embodiment 3

[0072] An experiment was conducted to investigate whether chlorine gas was generated when an aqueous solution of sodium hypochlorite was injected into sludge adjusted to acidity.

[0073] Sludge with a sludge concentration of 17100mg / L was taken into a 500mL beaker, and while being stirred by a stirring device, 0.9mL of 8.5% dilute hydrochloric acid was injected, and the pH value was 3.5. Next, the 12% sodium hypochlorite aqueous solution was titrated 1 mL at a time to confirm whether or not chlorine gas was generated, and the pH value at that time was also measured. The experimental results are given in the table.

[0074] (Table 1)

[0075] Chlorine gas production experiment of high-concentration sludge (SS 17100mg / L added to 500mL, starting pH3.5)

[0076] Titration, mL

[0077] As shown in Table 1, chlorine gas was not generated even when the sodium hypochlorite aqueous solution was injected into the sludge of pH 3.5. In addition, when dilute hydrochloric acid...

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Abstract

A method of reducing the amount of a sludge, wherein some of the sludge generated in an aeration tank is safely and efficiently converted to a substrate with hypochlorous acid and the substrate is returned to the aeration tank and digested. Dilute hydrochloric acid or dilute sulfuric acid is injected into some of a sludge withdrawn from a sedimentation tank (4), and the mixture is stirred to make the sludge weakly acidic. Subsequently, an aqueous sodium hypochlorite solution is injected into the sludge having a sludge concentration of 2,000-26,000 mg / L, in such an amount as to result in an effective chlorine concentration of 300-1,600 mg / L, and the mixture is stirred to convert the sludge into a substrate. According to need, an aqueous sodium sulfite solution or an aqueous sodium thiosulfate solution is injected into the substrate sludge, and the mixture is stirred. This mixture is returned to the aeration tank (3) and aerated to digest the sludge. Thus, the amount of a sludge is reduced.

Description

technical field [0001] The present invention relates to a sludge reduction method and a sludge reduction device. More specifically, the present invention relates to the following sludge reduction method and sludge reduction device, wherein the sludge containing organic matter is treated in an aeration tank A part of the sludge generated when the wastewater is treated with activated sludge reacts with weakly acidic hypochlorous acid, undergoes matrix treatment in a state that can be decomposed by microorganisms, and returns it to the aeration tank again for activated sludge treatment and digestion Sludge, suppressing the generation of excess sludge. Background technique [0002] An activated sludge method is known as one of methods for treating wastewater containing organic matter. This activated sludge method is a method in which, as is known in the past, so-called planktonic organic sludge in which aerobic bacteria, protozoa, etc. live, that is, activated sludge, is kept i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/06C02F3/12C02F11/00
CPCC02F1/66C02F1/76C02F3/1221C02F2303/06Y02W10/10
Inventor 立川英夫立川浩史村上光正
Owner イーエステクノロジー
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