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
CN102428043AInactive Publication Date: 2012-04-25イーエステクノロジー
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
イーエステクノロジー
Publication Date
2012-04-25
Estimated Expiration
Not applicable · inactive patent

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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 Dilute hydrochloric acid or dilute sulfuric acid is injected into some of a sludge withdrawn from a sedimentation tank (4), and the mixture is stirred to make the sludge weakly acidic.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.
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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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