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Method for producing methane by microbial electrocatalysis enhanced organic waste

A technology for microbial electricity and methane production, which is applied in waste fuel, fermentation, etc., can solve the problems of inability to rapidly convert methane into organic wastewater, shock, poor stability and robustness, and achieve advanced treatment and energy utilization, and reduce carbon emissions. Emissions, the effect of improving the efficiency of methanation

Inactive Publication Date: 2021-04-20
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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Problems solved by technology

However, due to the limitation of the traditional methanation metabolism rate, the high-concentration organic wastewater produced in the anaerobic acidification phase cannot be quickly converted into methane, and the low pH value of the acidification phase has an impact on the microenvironment of the methanation phase, resulting in anaerobic organic waste. The oxygen fermentation process still has problems such as poor stability and robustness

Method used

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  • Method for producing methane by microbial electrocatalysis enhanced organic waste
  • Method for producing methane by microbial electrocatalysis enhanced organic waste
  • Method for producing methane by microbial electrocatalysis enhanced organic waste

Examples

Experimental program
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Embodiment 1

[0033] like figure 1As shown, the food waste crushing and screening unit removes large materials such as bones and fish bones, enters the wet heat pretreatment unit, and enters the anaerobic fermentation phase reactor through wet heat hydrolysis. 3 d), operating at pH 5.5-6.5, at 45-55°C for acid-producing and hydrogen-producing fermentation, the hydrogen content in the biogas produced is more than 50%, and the hydrogen production rate is 100-150L / (kgVS·d), The content of ethanol and volatile fatty acid in the fermentation broth is 1000-1500mg / L (butyric acid is the main organic acid component).

[0034] The methane-producing MEC reactor needs to be started and debugged in advance. The anaerobic granular sludge required for start-up is taken from the anaerobic digestion tank of citric acid wastewater, and the anaerobic granular sludge is mixed with glucose and ethanol solution for methanation activation treatment. Among them, a small amount of ethanol promoted the proliferat...

Embodiment 2

[0037] Food waste enters the anaerobic fermentation reactor after being crushed, screened, and pretreated by heat and humidity. At an organic load of 9kgVS / (m 3 d), the operating pH is 6, acid-producing hydrogen-producing fermentation is carried out under high temperature conditions of 35±1°C, the hydrogen production rate is 60-100L / (kgVS·d), and the content of ethanol and volatile organic acids in the fermentation broth is 13000- 16000mg / L, including acetic acid 6000-8000mg / L, propionic acid 1000-1200mg / L, butyric acid 5600-6000mg / L.

[0038] The start-up of the MEC reactor in the methanogenic phase is the same as in Example 1.

[0039] The fermentation liquid produced by the anaerobic fermentation of food waste is centrifuged and input into the successfully started-up methanogenic phase MEC reactor, and the biogas containing hydrogen is transported to the reactor through the gas pump, and is evenly distributed in the production area by the bottom gas diffuser. Inside the me...

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Abstract

The invention discloses a method for synergistically enhancing methane production from food waste by anaerobic fermentation and microbial electrocatalysis. The method comprises the following steps of (1) conducting anaerobic fermentation, crushing organic garbage to prepare slurry, and adding the slurry into an anaerobic fermentation reactor in an intermittent feeding manner to carry out acid-producing hydrogen-producing fermentation; (2) starting a methanogenesis phase reactor, namely enriching electroactive microorganisms and starting the methanogenesis phase reactor by taking granular sludge as an inoculum, a mixed acid as a culture solution and a single-chamber microbial electrolysis cell as the methanogenesis phase reactor; (3) carrying out solid-liquid separation on a fermentation broth obtained in the (1), adjusting the pH value of the fermentation broth to 6.0-8.0 by using a supernatant, pumping the fermentation broth into the methanogenesis phase reactor successfully started in the (2), injecting biogas generated by fermentation in the (1) into the methanogenesis phase reactor, keeping the headspace hydrogen partial pressure of the reactor lower than 1.0 bar, and converting hydrogen and carbon dioxide in the biogas into the methane at a cathode. The methanogenesis phase reactor operates in an internal reflux mode.

Description

technical field [0001] The invention relates to a method for turning organic waste into energy, in particular to a method for using microorganisms to electrocatalyze and strengthen organic waste to produce methane. Background technique [0002] Anaerobic methanation is one of the effective methods to realize the green energy conversion of organic waste, but the existing anaerobic fermentation processes generally have low methane conversion efficiency, difficulty in stable operation (acidification feedback inhibition, high ammonia nitrogen inhibition, etc.), process cycle long and lengthy questions. The two-phase anaerobic fermentation technology has been widely used because it separates the biological phase of the fermentation process, making the complex anaerobic process easy to regulate physiologically and ecologically, and effectively improving the substrate conversion efficiency and gas production rate. However, due to the limitation of the traditional methanation metab...

Claims

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Application Information

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IPC IPC(8): C12P5/02
CPCY02E50/30
Inventor 贾璇赵玉娇朱雨森
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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