A method of metal conductive material combined with sludge pretreatment to promote methane production by anaerobic digestion of excess sludge

A technology of excess sludge and metal conductivity, applied in biological sludge treatment, waste fuel, etc., can solve problems such as low hydrolysis rate and low methane yield, achieve strong mechanical strength, high unit methane production rate, and promote residual pollution. The effect of anaerobic digestion of mud for methane production

Active Publication Date: 2022-06-03
HARBIN UNIV
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  • Description
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of low hydrolysis rate and low methane production rate in the existing sludge anaerobic digestion process, and provide a metal conductive material combined with sludge pretreatment to promote the anaerobic digestion of excess sludge. methane method

Method used

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  • A method of metal conductive material combined with sludge pretreatment to promote methane production by anaerobic digestion of excess sludge
  • A method of metal conductive material combined with sludge pretreatment to promote methane production by anaerobic digestion of excess sludge
  • A method of metal conductive material combined with sludge pretreatment to promote methane production by anaerobic digestion of excess sludge

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Embodiment 1

[0027] Example 1: In this example, the metal conductive material combined with the sludge pretreatment to promote the anaerobic digestion of excess sludge to produce methane is carried out according to the following steps:

[0028] Step 1. Pre-treatment of metal mesh: Take 200 mesh stainless steel mesh (SS-M), cut SS-M into 6.25mm×6.25mm pieces, and take the total area of ​​200cm 2 The SS-M fragments were soaked in HCl solution with a concentration of 5 mol / L for 24 h to remove the surface oxide film, washed with distilled water until neutral, and dried at 40 °C in a vacuum drying oven for use.

[0029] Step 2: Pretreatment of excess sludge: the excess sludge in the secondary sedimentation tank is naturally settled for 12 hours, the sludge concentration is adjusted to 12g / L after removing the supernatant, and the pH value is adjusted to 10-11 with 4mol / L NaOH solution. Adjust once every 10min for a total of 3 times, refrigerate at 4°C for use;

[0030] Step 3: Mix the SS-M tr...

Embodiment 2

[0034] Embodiment 2: The method for promoting methane production by anaerobic digestion of excess sludge by metal conductive material combined with sludge pretreatment in this embodiment is carried out according to the following steps:

[0035] Step 1. Pre-treatment of metal mesh: Take 200 mesh nickel mesh (Ni-M), cut the Ni-M into 6.25×6.25mm pieces, and take the total area of ​​200cm 2 The nickel mesh fragments were soaked in HCl solution with a concentration of 6 mol / L for 24 hours to remove the surface oxide film, washed with distilled water until neutral, and dried in a vacuum drying box at 40 °C for use.

[0036] Step 2. Pretreatment of excess sludge: the excess sludge in the secondary sedimentation tank is naturally settled for 24 hours, the sludge concentration is adjusted to 14g / L after removing the supernatant, and the pH value is adjusted to 10 with 6mol / L NaOH solution, every 10min Adjust once, adjust 3 times in total, and refrigerate at 4°C for later use;

[0037...

Embodiment 3

[0039] Embodiment 3: The method for promoting methane production by anaerobic digestion of excess sludge by metal conductive material combined with sludge pretreatment in this embodiment is carried out according to the following steps:

[0040] Step 1. Pre-treatment of metal mesh: Take 200 mesh copper mesh (Cu-M), cut the Cu-M into 6.25mm×6.25mm pieces, and take the total area of ​​200cm 2The nickel mesh fragments were soaked in HCl solution with a concentration of 6 mol / L for 24 hours to remove the surface oxide film, washed with distilled water until neutral, and dried in a vacuum drying box at 40 °C for use.

[0041] Step 2. Pretreatment of excess sludge: the excess sludge in the secondary sedimentation tank is naturally settled for 24 hours, the sludge concentration is adjusted to 14g / L after removing the supernatant, and the pH value is adjusted to 10 with 6mol / L NaOH solution, every 10min Adjust once, adjust 3 times in total, and refrigerate at 4°C for later use;

[004...

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Abstract

The invention discloses a method for promoting the anaerobic digestion of excess sludge to produce methane by combining metal conductive material with sludge pretreatment, which belongs to the field of methane production by microorganisms using waste biomass. The invention overcomes the problems of low hydrolysis rate and low methane yield in the existing sludge anaerobic digestion methane production process. The method of the present invention is as follows: 1. Cut the metal mesh into pieces, remove the surface oxide film, wash to neutrality, and dry; 2. Naturally settle the remaining sludge in the secondary sedimentation tank for 12h to 24h, and adjust the sludge concentration after removing the supernatant , adjust the pH value to 10-11; 3. metal materials strengthen sludge anaerobic digestion to produce methane; In the anaerobic digestion system, the present invention induces the enrichment of methanogenic bacteria and intertrophic methanogenic microorganisms in the sludge by pretreating the sludge and using a built-in conductive material, so as to improve the methane output and productivity.

Description

technical field [0001] The invention relates to the field of methane preparation by microorganisms using waste biomass, and particularly relates to a method for promoting anaerobic digestion of excess sludge to produce methane by combining metal conductive materials with sludge pretreatment. Background technique [0002] With the development of the economy and the improvement of the quality of life, the output of excess sludge, which is the main by-product in the sewage treatment process, is also increasing year by year. Anaerobic digestion of excess sludge is one of the main ways of sludge treatment and disposal at present, and its reasonable energy utilization is expected to meet the "energy self-sufficiency" needs of sewage treatment plants. However, the organic matter in the excess sludge mainly exists in extracellular polymers or cells, which are difficult for microorganisms to use and convert into substrates that can be used by methanogens, resulting in the existence o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04
CPCC02F11/04Y02E50/30
Inventor 杨春雪王羚
Owner HARBIN UNIV
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