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Pretreatment method for municipal sludge anaerobic digestion

A technology for anaerobic digestion and municipal sludge, applied in sludge treatment, biological sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of increasing equipment investment, secondary pollution, high energy consumption, etc., and achieve improvement Corrosion condition, effect of reducing maintenance cost

Inactive Publication Date: 2019-10-22
上海敏建环保科技有限公司
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Problems solved by technology

[0005] Strong acid (such as hydrochloric acid, sulfuric acid, etc.) and strong base (such as sodium hydroxide) are used for pretreatment. These strong acids and strong bases still remain in the material liquid after anaerobic digestion. If they are not treated, It may cause secondary pollution; in order to prevent strong acid and strong alkali from corroding equipment, it is necessary to increase equipment investment
The use of hydrothermal method, ultrasonic method and microwave method in pretreatment has the problems of high energy consumption and large investment in equipment

Method used

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Examples

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no. 2 example

[0018] The difference from the first embodiment is that this embodiment provides a pretreatment method for anaerobic digestion of municipal sludge. The mixture of lactic acid and acetic acid used can use fermented agricultural and forestry products containing organic acids such as lactic acid and acetic acid. Waste replacement, the amount of fermented agricultural and forestry waste containing organic acids such as lactic acid and acetic acid is 1%-800% of the solid content in the sludge, and the use of fermented agricultural and forestry waste and potatoes containing organic acids such as lactic acid and acetic acid (such as cassava, sweet potato, potato, etc.) and various grains, without separating organic acids, they can be directly added to sludge, which can greatly reduce the cost of pretreatment.

[0019] In summary, a pretreatment method for anaerobic digestion of municipal sludge of the present invention can react organic acids such as lactic acid and acetic acid with s...

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Abstract

The invention discloses a pretreatment method for municipal sludge anaerobic digestion. The pretreatment method comprises the steps: firstly sludge is concentrated to 1.2%-12%, then lactic acid or acetic acid or a mixture of the lactic acid and the acetic acid is added for treatment, stirring is conducted in the treatment process, heating is conducted in the stirring process, the temperature is kept at 80-100 DEG C, the temperature is increased to be 80-100 DEG C, continuous treatment is conducted for 0.5-4 h, then cooling is conducted, and after being cooled to 35-50 DEG C, the sludge is sentto be subjected to anaerobic digestion so as to prepare biogas.

Description

technical field [0001] The invention relates to the technical field of sludge treatment and resource utilization, in particular to a pretreatment method for anaerobic digestion of municipal sludge. Background technique [0002] As the rate of urban sewage treatment in our country increases year by year, the output of sludge, as a by-product in the process of sewage treatment, also increases sharply. Sludge contains a large number of microorganisms, suspended solids, colloids, nitrogen and phosphorus, and other substances. If it is not properly treated and disposed of, it will cause secondary pollution to the environment. At the same time, the sludge contains a large amount of organic substances, and the use of sludge anaerobic fermentation to produce biogas can not only recycle the organic substances, but also effectively reduce the sludge discharge of sewage treatment plants, and realize the stabilization and reduction of sludge , Harmless and resourceful. [0003] Most...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/12C02F11/04
CPCC02F11/00C02F11/04C02F11/12
Inventor 孙敏李洪亮马晓建
Owner 上海敏建环保科技有限公司
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