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A kind of pretreatment and anaerobic digestion treatment method of high solid content sludge

A high solid content and pretreatment technology, applied in biological sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of low methane production and thermal hydrolysis efficiency reduction, and achieve methane production Effects of increasing and diluting inhibitory substances and reducing treatment costs

Active Publication Date: 2021-09-21
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the deficiencies and defects of the above-mentioned prior art, the purpose of the present invention is to disclose a method for pretreatment and anaerobic digestion of high-solid sludge, so as to solve the problem of thermal hydrolysis caused by the increase of sludge solid content in the prior art. Technical issues of reduced efficiency and low methane production in the anaerobic digestion process

Method used

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  • A kind of pretreatment and anaerobic digestion treatment method of high solid content sludge
  • A kind of pretreatment and anaerobic digestion treatment method of high solid content sludge
  • A kind of pretreatment and anaerobic digestion treatment method of high solid content sludge

Examples

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Effect test

Embodiment 1

[0071] According to the above technical solution, the thermal hydrolysis device in this embodiment consists of a pressure reaction vessel and heating equipment. The pressure reaction vessel is a cylindrical digestion tank. The tank body of the reaction tank is made of stainless steel, and the inner liner is a polytetrafluoroethylene digestion tank. The effective volume is 200mL, the working temperature is <250°C, and the working pressure is <3.0MPa. The heating equipment is a digital display constant temperature oil bath, equipped with two sets of temperature detection systems, and the heating medium is dimethyl silicone oil.

[0072] Add a certain brand of hot pot bottom material to 500ml of water, boil, cool, and separate the upper layer of fat, which is solid at room temperature.

[0073] Step 1: Preparation of mixed sludge:

[0074] Evenly mix kitchen oil and high-solid sludge, the mixing ratio is 0.2g oil / g high-solid sludge, take 17g kitchen oil and 83g high-solid sludg...

Embodiment 2

[0080] The thermal hydrolysis device in this embodiment consists of a pressure reaction vessel and heating equipment. The pressure reaction vessel is the same as in Example 1.

[0081] The anaerobic digestion test device includes a constant temperature oscillator and an anaerobic digestion reactor. The anaerobic digestion reactor includes a reaction bottle, a gas collection bottle and a gas volume measurement bottle, and the gas production is measured by the drainage gas collection method.

[0082] Add a certain brand of hot pot bottom material to 500ml of water, boil, cool, and separate the upper layer of fat, which is solid at room temperature.

[0083] Step 1: Preparation of mixed sludge:

[0084] Evenly mix kitchen oil and high-solid sludge, the mixing ratio is 0.2g oil / g high-solid sludge, take 17g kitchen oil and 83g high-solid sludge and mix evenly to obtain 100g mixed sample;

[0085] Step 2: thermal hydrolysis:

[0086] Take 100g of the mixed sample and place it i...

Embodiment 3

[0097] This embodiment is basically the same as Example 1, the difference is that the mixing ratio of kitchen grease and high-solid sludge in this embodiment is 0.4g grease / g high-solid sludge, and 29g of kitchen grease and 71g high-solid sludge The mud is evenly mixed, and 100g of the mixed sample is taken for testing.

[0098] Combined with the manual figure 1 , 2 , 3, and 4 can be obtained. When the mixing ratio of kitchen oil and high-solid sludge is 0.4g oil / g high-solid sludge, after thermal hydrolysis, the thermal hydrolysis time is 90min, and the SCOD and solubility in the cells The release of carbohydrates, soluble protein, and ammonia nitrogen increased significantly, indicating that oil can accelerate heat transfer and promote the dissolution of insoluble organic matter. Among them, SCOD increased by 31.9±5.1%, soluble carbohydrates increased by 35.7±2.1%, soluble proteins increased by 41.4±5.4%, and ammonia nitrogen increased by 58.6±5.6%.

[0099] Combined with...

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Abstract

The invention discloses a method for treating high-solid sludge and anaerobic digestion. Hydrolysis treatment; the kitchen oil has the following indicators: by volume, the kitchen oil contains 26.5% to 32.1% of palmitic acid, 24.1% to 32.6% of oleic acid and 5.3% to linoleic acid 8.0%, 9.8% to 10.5% stearic acid, and 23.1% to 28% of other ingredients; thermal conductivity is 0.1953 to 0.2263W / (m K); anaerobic digestion methane yield rate is 0.99L methane / g fat quality; solid content is 98.21% to 98.71%; volatile matter content is 97.89% to 98.41%. The invention utilizes the good thermal conductivity of kitchen grease to promote the lysis of high-solid sludge cells, release and dissolve macromolecular organic matter in cells, and disintegrate sludge flocs and dissolve EPS inside and on the surface, thereby strengthening microorganisms Utilize organic matter and improve digestion efficiency.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a pretreatment method of high-solid sludge and an anaerobic digestion treatment method. Background technique [0002] Since the efficiency of direct anaerobic digestion is relatively low, in order to improve the efficiency of anaerobic digestion of sludge, sludge pretreatment is usually required before anaerobic digestion. [0003] Sludge thermal hydrolysis is an important method of sludge pretreatment, that is, under a certain temperature and pressure, the sludge is heated in a closed container to make a series of physical and chemical changes in the structure and properties of the sludge flocs. process of change. These include: 1. Microbial cell structure is destroyed, and the release of intracellular bound water improves the dehydration performance of sludge; 2. Solid organic matter in sludge is dissolved and hydrolyzed, and its digestibility is significantly impro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04C02F101/30
CPCC02F11/04C02F2101/30
Inventor 韩芸李天星陈姝桦卓杨胡悦高源
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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