Anaerobic digestion device and process for pre-treating sludge with high solid content by heating method

A technology of anaerobic digestion and high solid content, applied in biological sludge treatment, sludge treatment through temperature control, etc., can solve the problems of large transport volume, high cost of sludge anaerobic digestion, difficult sludge hydrolysis and acidification, etc. , to achieve the effects of increasing anaerobic digestion rate and methane production, easy temperature control, and increased hydrolysis and acidification rate

Inactive Publication Date: 2013-04-03
TSINGHUA UNIV
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Problems solved by technology

[0008] In order to overcome the defects of the above-mentioned prior art, the object of the present invention is to provide a heating method pretreatment anaerobic digestion device and process of high solid content sludge, to solve the problem of large amount of sludge anaerobic digestion transportation, high cost, difficult sludge The problem of hydrolysis and acidification, to achieve sludge reduction, resource utilization and harmless

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  • Anaerobic digestion device and process for pre-treating sludge with high solid content by heating method

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Embodiment 1

[0030] This embodiment includes the following steps:

[0031] Step 1. In the sludge mixing unit 1, the solid distribution conveyor belt transports the sludge cake with a solid content of 15%, and the liquid transport pipe transports the sludge dewatering supernatant with the same weight. After stirring, the solid content is formed 10% sludge, and the sludge dewatering supernatant is the liquid after the sludge is filtered and dehydrated;

[0032] Step 2: After adjusting the solid content of the sludge, it is driven into the heating tube in the heating tank 2 through a peristaltic pump, and heated for pretreatment at 70°C for 30 minutes;

[0033] Step 3. Add the pretreated sludge into the anaerobic digestion tank 5 for agitated anaerobic digestion. In order to ensure the complete mixing and full contact between the materials in the anaerobic digestion tank 5 and the sludge, agitator 3 The speed is 90r / min, stirring for 20 minutes per hour, and the thermostatic water bath jacket is us...

Embodiment 2

[0036] This embodiment includes the following steps:

[0037] Step 1. In the sludge mixing unit 1, the solid distribution conveyor belt transports the sludge cake with a solid content of 25%, and the liquid transport pipe transports the sludge dewatering supernatant according to the same weight. After stirring, the solid content is formed 10% sludge, and the sludge dewatering supernatant is the liquid after the sludge is filtered and dehydrated;

[0038] Step 2: After adjusting the solid content of the sludge, it is driven into the heating tube in the heating tank 2 through a peristaltic pump, and heated for pretreatment at 70°C for 45 minutes;

[0039] Step 3. Add the pretreated sludge into the anaerobic digestion tank 5 for agitated anaerobic digestion. In order to ensure the complete mixing and full contact between the materials in the anaerobic digestion tank 5 and the sludge, agitator 3 The speed is 120r / min, stirring for 20 minutes per hour, and the thermostatic water bath jac...

Embodiment 3

[0042] This embodiment includes the following steps:

[0043] Step 1. In the sludge mixing unit 1, the solid distribution conveyor belt transports the sludge cake with a solid content of 25%, and the liquid transport pipe transports the sludge dewatering supernatant according to the same weight. After stirring, the solid content is formed 10% sludge, and the sludge dewatering supernatant is the liquid after the sludge is filtered and dehydrated;

[0044] Step 2. After adjusting the solid content of the sludge, it is driven into the heating tube in the heating tank 2 through a peristaltic pump, and heated for pretreatment at 70°C for 60 minutes;

[0045] Step 3. Add the pretreated sludge into the anaerobic digestion tank 5 for agitated anaerobic digestion. In order to ensure the complete mixing and full contact between the materials in the anaerobic digestion tank 5 and the sludge, agitator 3 Rotation speed is 150r / min, stirring for 30 minutes per hour, and thermostatic water bath ja...

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Abstract

The invention discloses an anaerobic digestion device and process for pre-treating sludge with high solid content by a heating method. The anaerobic digestion process comprises the following steps of: forming sludge with solid content of 10% in a sludge mixing unit; pumping the sludge to a heating tube of a heating tank by a peristaltic pump; heating and pre-heating the sludge for 30-60 minutes at the temperature of 70 DEG C; and adding the pre-treated sludge to an anaerobic digestion tank for carrying out stirring anaerobic digestion. According to the anaerobic digestion device and process provided by the invention, the problems that the sludge anaerobic digestion has larger traffic volume, the cost is high, and the sludge is difficult to hydrolyze and acidize are solved; and the reduction, reclamation and innoxious disposal of the sludge are realized.

Description

Technical field [0001] The invention relates to a sludge anaerobic digestion process, in particular to a heating method pretreatment of high solid content sludge anaerobic digestion device and process. Background technique [0002] With the development of my country's economy and the improvement of people's living standards, more and more sewage and waste water are produced in production and life. At present, the number of newly built sewage treatment plants in my country is increasing rapidly, and the sewage treatment rate is also increasing year by year. The main form of technology adopted by most sewage treatment plants is biological treatment. [0003] The essence of the biological treatment of urban sewage (activated sludge method or biofilm method) is the metabolic process of microorganisms using colloidal and dissolved organic pollutants in the sewage as the nutrient substrate. The result of this process is that the sewage is purified and the microorganisms are obtained. En...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F11/18
Inventor 左剑恶刘峰林林甲陈晓洁
Owner TSINGHUA UNIV
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