Enhanced bioelectrochemical hydrogen production method and bioelectrochemical hydrogen production system

Abstract

The invention provides a bioelectrochemical hydrogen production method and a bioelectrochemical hydrogen production system. The hydrogen production method includes the following steps: cultivating anode electrogenic bacteria in the microbial fuel cell mode, and producing hydrogen in the microbial electrolytic cell mode , the method for the hydrogen production system to realize hydrogen production includes: adding a methanation inhibitor in the electrolysis chamber, applying an external voltage to both ends of the microbial electrolysis cell through an external power supply, starting the microbial electrolysis cell after the anode biofilm is domesticated, and the anode is degrading Electrons, H are released during organic processes + And carbon dioxide, electrons reach the cathode through the external circuit, and at the cathode and H + Combined to generate hydrogen; the present invention adds the methanation inhibitor 3-NOP in the hydrogen production method to chemically inactivate the methyl coenzyme M of the methanogen, avoiding the consumption of hydrogen by the methanogen through the methyl coenzyme M, and realizing the inhibition The purpose of methanation, thereby enhancing the hydrogen production performance of the system, makes the bioelectrochemical hydrogen production system more valuable for application and promotion.

Description

technical field [0001] The invention belongs to the technical field of organic waste / wastewater, and in particular relates to a bioelectrochemical hydrogen production method and a bioelectrochemical hydrogen production system. Background technique [0002] The bioelectrochemical hydrogen production system can convert the chemical energy in organic waste / wastewater into hydrogen, realize their resource utilization, and has broad development prospects in the field of organic waste / wastewater treatment. [0003] Bioelectrochemical hydrogen production systems are divided into two categories: double-chamber and single-chamber. The anode and cathode of the dual-chamber bioelectrochemical hydrogen production system are separated into two chambers by an ion-exchange membrane. It is difficult for methanogenic bacteria to access hydrogen, and they cannot compete with electrogenic bacteria in terms of substrate utilization, so the degree of methanation is low; but the anode The cathod...

AI Technical Summary

Problems solved by technology

[0006] 1. Physical method: 1) Introduce air to inhibit the activity of methanogens, but this will also reduce the activity of electrogenic bacteria; 2) Increase the applied voltage to above 0.7V. This method is only effective in the initial stage, and the reactor will run for half a month. , still mainly producing methane; 3) Lower the temperature to 4°C, and the methanogens are completely inhibited, but this will also reduce the reaction rate and increase energy consumption; 4) Ultraviolet light irradiation, this method is only for systems that have not undergone methanation Effective, once a stable methanogenic system is established in the system, ultraviolet irradiation will no longer work; 5) Change the configuration of the reactor, install a polytetrafluoroethylene membrane between the cathode and the anode to separate, and the cathode is close to the membrane On the other side of the reactor, a negative pressure pump is installed at the end of the reactor. Although the diffusion of hydrogen to the electrolyte side is effectively avoided, the existence of the film between the anode and cathode electrodes increases the internal resistance of the system, reduces the Coulombic efficiency, and produces hydrogen. Poor performance, accompanied by problems such as membrane fouling and scaling caused by ion migration

[0007] 2. Chemical method: 1) Adding acid reduces the pH of the electrolyte and inhibits the activity of methanogenic bacteria, but this will also reduce the activity of electrogenic bacteria; 2) Adding coenzyme M analogs as methanation inhibitors, currently effective coenzyme The M analog has 2-bromoethanesulfonate, which can be observed to have an obvious inhibitory effect, and the concentration must be close to 0.6mM to completely inhibit the production of methanogenesis. At the same time, 2-bromoethanesulfonate has certain toxicity and will irritate the eyes , respiratory system and skin, and basically no degradation in N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid (BES); 3) halogenated aliphatic hydrocarbons, of which the Chloroform has a structure similar to methyl and a strong carbon-hydrogen bond, which can inhibit the biological action of functional enzymes such as methyl coenzyme M, but it is toxic and irritating, and is a suspected carcinogen

Images