Method for enhancing hydrogen production of single-chamber microbial electrolysis cell

Abstract

The invention discloses a method for enhancing hydrogen production of a single-chamber microbial electrolysis cell, and belongs to the field of microbial electrochemistry. Compared with a traditional microbial electrolysis cell method, the method can increase the hydrogen yield significantly, by controlling the starting step of the microbial electrolysis cell, different impressed voltages are adjusted, the pH value is increased in a stepped mode, hydraulic retention time under different pH value conditions is adjusted strictly to promote enrichment and domestication of electrogenesis microorganisms, finally the microbial electrolysis cell operates stably under the condition of pH>=10.5, and the hydrogen yield can reach 70% or above. The method has the advantages of low energy consumption, the high hydrogen yield, the large substrate use ratio, low cost and the like.

Description

technical field [0001] The invention relates to the technical field of microbial electrochemistry, in particular to the fields of using microbial electrolytic cells to produce hydrogen and suppressing microbial electrolytic cells to produce methane. Background technique [0002] Since the industrial revolution in the 18th century, the annual consumption of non-renewable resources such as coal, oil, and natural gas has continued to increase. According to the predictions of energy agencies in various countries, according to the current usage conditions, these fossil energy sources will be exhausted in about a hundred years. Now the world The consumption of energy continues to rise, which makes it more difficult to meet the energy supply. At the same time, the use of fossil energy has caused serious environmental problems. The C element fixed by the earth for hundreds of millions of years is converted into CO2 and emitted into the atmosphere within hundreds of years, leading t...

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Problems solved by technology

2) Reduce the pH value; introduce air, but this will also reduce the activity of electrogenic bacteria; 3) Increase the applied voltage to above 0.7V. This method is only effective in the initial stage. After half a month of operation, the reactor still produces methane. Main; 4) Lower the temperature to 4°C and the methanogens will be completely inhibited, which will also reduce the reaction rate and increase energy consumption

In the previous invention patents on enhancing the hydrogen production of microbial electrolytic cells, such as the method mentioned in the patent No. 201510217696.8, it is only applicable to the dual-chamber microbial electrolytic cell, and the operation is cumbersome, the internal resistance is large, and the effect is ineffective. Single-chamber microbial electrolytic cell is good

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