Method for promoting anaerobic digestion of excess sludge to produce methane by combining metal conductive material with sludge pretreatment

A technology for excess sludge and metal conduction, applied in biological sludge treatment, waste fuel, etc., can solve the problems of low methane production rate and low hydrolysis rate, and achieve high unit methane production rate, strong mechanical strength, and convenient recycling Effect

Active Publication Date: 2021-01-22
HARBIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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  • Method for promoting anaerobic digestion of excess sludge to produce methane by combining metal conductive material with sludge pretreatment
  • Method for promoting anaerobic digestion of excess sludge to produce methane by combining metal conductive material with sludge pretreatment
  • Method for promoting anaerobic digestion of excess sludge to produce methane by combining metal conductive material with sludge pretreatment

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Embodiment 1

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

[0028] Step 1. Pretreatment 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 as 200cm 2 The SS-M fragments were soaked in HCl solution with a concentration of 5mol / L for 24 hours to remove the surface oxide film, washed with distilled water until neutral, and dried in a vacuum oven at 40°C for later use.

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

[0...

Embodiment 2

[0034] Embodiment 2: In this embodiment, the metal conductive material combined with sludge pretreatment method to promote the anaerobic digestion of excess sludge to produce methane is carried out according to the following steps:

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

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

[0037] Step 3. ...

Embodiment 3

[0039] Embodiment 3: In this embodiment, the metal conductive material combined with sludge pretreatment method to promote the anaerobic digestion of excess sludge to produce methane is carried out according to the following steps:

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

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

[0042] Step 3....

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Abstract

The invention discloses a method for promoting anaerobic digestion of excess sludge to produce methane by combining a metal conductive material with sludge pretreatment, and belongs to the field of preparation of methane from waste biomass by microorganisms. The invention aims to solve the problems of low hydrolysis rate and low methane yield in the existing sludge anaerobic digestion methane production process. The method comprises the following steps: 1, cutting a metal net into pieces, removing a surface oxide film, cleaning to be neutral, and drying; 2, naturally settling the residual sludge in the secondary sedimentation tank for 12-24 hours, removing the supernatant, regulating the sludge concentration, and regulating the pH value to 10-11; 3, strengthening anaerobic digestion of thesludge by using a metal material to produce methane; and 4, recovering the metal net, and directly using the metal net for anaerobic digestion to produce methane. According to the method, enrichmentof methanogens and syntrophic methanogens in the sludge is induced through sludge pretreatment and by utilizing a built-in conductive material in an anaerobic digestion system, so that the methane yield is increased, and the yield is increased.

Description

technical field [0001] The invention relates to the field of methane preparation by microorganisms using waste biomass; in particular, it relates to a method for promoting methane production by anaerobic digestion of excess sludge in combination with metal conductive materials and 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 process of sewage treatment, 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" demand of sewage treatment plants. However, the organic matter in the remaining sludge mainly exists in extracellular polymers or cells, which are difficult for microorganisms to use and convert them into substrates that can be used by methanogens, which ...

Claims

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Application Information

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