Method for enhancing methane production efficiency of anaerobic digestion of wastewater sludge by coupling electric field with Fe-C composite mediator

A composite media and wastewater sludge technology, which is applied in anaerobic digestion treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of limited methane performance, easily inhibited methane production, long reaction time, etc. problem, to achieve the effect of increasing flocculation strength, increasing methane production rate, and increasing electrical conductivity

Active Publication Date: 2021-08-31
HARBIN INST OF TECH +1
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Problems solved by technology

However, there are still many problems in the practical application of anaerobic biological treatment technology: for example, the reaction time is long, and the methanogenic process is easily inhibited, etc.
However, when using low voltag

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  • Method for enhancing methane production efficiency of anaerobic digestion of wastewater sludge by coupling electric field with Fe-C composite mediator
  • Method for enhancing methane production efficiency of anaerobic digestion of wastewater sludge by coupling electric field with Fe-C composite mediator

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Embodiment 1

[0038] The iron-carbon composite material prepared above is coupled with an electric field to treat anaerobic wastewater, and the enhanced treatment steps are as follows:

[0039] ①Add 20mL of anaerobic sludge and 80mL of wastewater into the anaerobic bottle, and the headspace is 30mL. And add 100mg iron-carbon composite mediator.

[0040] ②Connect a steel needle with a three-way valve for sampling and an air bag to the anaerobic bottle for liquid sampling and gas collection.

[0041] ③Using titanium meshes as electrodes (the distance between the titanium meshes is 2cm, and the size is 1.5cm*1.5cm), connect with the potentiostat through titanium wires, and apply a constant potential of 0.10V to the reactor.

[0042] ④ Connect the anaerobic bottle and place it in a constant temperature shaker. Control the temperature of the constant temperature shaker at 35±1°C and keep the rotation speed at 95r / min.

[0043] During the operation of the anaerobic reaction, the liquid and gas ...

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Abstract

The invention discloses a method for enhancing the methane production efficiency of anaerobic digestion of wastewater sludge by coupling an electric field with a Fe-C composite mediator. The method comprises the following steps: (1) adding the Fe-C composite mediator and an electrode into an anaerobic container filled with anaerobic sludge and wastewater; and (2) putting the anaerobic container in the step (1) into a magnetic stirrer or a constant-temperature shaking table for a period of time, and applying voltage to the electrode at the same time. The electric field and the Fe-C composite mediator are added, so that the organic matter degradation rate and the methane generation rate are increased; the electric field and the Fe-C composite mediator are added to enhance the conductivity of anaerobic sludge and enhance the secretion of extracellular polymeric substances, so that the flocculation strength of the anaerobic granular sludge is improved, and the electron transfer capability among anaerobic microorganisms is improved; and the electric field and the Fe-C composite mediator are added to promote growth and metabolism of acetic acid fermentation type methanogens and microorganisms capable of performing direct electron transfer, and the methane generation efficiency in the anaerobic wastewater treatment process is effectively promoted.

Description

technical field [0001] The invention belongs to the technical field of sludge anaerobic digestion strengthening treatment, and in particular relates to a method for enhancing the methane production efficiency of waste water sludge anaerobic digestion by coupling an Fe-C composite mediator with an electric field. Background technique [0002] Anaerobic wastewater treatment technology is an economical and effective way to treat medium and high concentration organic wastewater. Compared with the traditional aerobic activated sludge method, it has the advantages of high organic load, low energy consumption, strong impact resistance and the ability to generate biogas. Because it combines sewage treatment with energy, it has been widely concerned and applied. [0003] During the anaerobic treatment of wastewater, the organic matter in the wastewater is finally transformed into water, carbon dioxide, methane, etc. through the co-metabolism of various microorganisms. The whole ana...

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Application Information

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IPC IPC(8): C02F3/00C02F3/28
CPCC02F3/005C02F3/28C02F2203/006Y02E50/30
Inventor 张照韩孙沐晨冯玉杰吕淼韦纯忠林勇俸荣伟
Owner HARBIN INST OF TECH
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