Coupled bioelectrochemical hydrogen production and collection device, system and hydrogen production method

Abstract

The invention provides a coupled bioelectrochemical hydrogen production and collection device, system and hydrogen production method. In the device, the first hydrophobic and gas-permeable membrane and the second hydrophobic and gas-permeable membrane are respectively placed on the rear side and the front side of the cathode, respectively. Collect the residual hydrogen on the cathode side and the electrolyte, so as to play a synergistic effect, so that the negative pressure pump realizes double negative pressure gas collection, and the air bag is connected to the other end of the third gas collecting pipe through the negative pressure pump and pipeline for collecting And store hydrogen to achieve the purpose of quickly collecting the hydrogen generated in the system, so that the methanogenic bacteria in the electrolyte are difficult to contact with hydrogen; at the same time, a methanation inhibitor is added to the electrolyte to make the methyl coenzyme M of the methanogenic bacteria Chemical inactivation prevents methanogens from using methyl coenzyme M to consume hydrogen to produce methane, thereby inhibiting methanation; in the system of the present invention, the cathode and anode are in the same room, which reduces the internal resistance of the system, improves the Coulombic efficiency, and further achieves The purpose of efficient and continuous hydrogen production performance.

Description

technical field [0001] The invention belongs to the technical field of organic waste / wastewater, and in particular relates to a coupled bioelectrochemical hydrogen production and collection device, system and hydrogen production method. 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. Bioelectrochemical hydrogen production systems are divided into two types: double chamber and single chamber, both of which collect hydrogen through gas diffusion. 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 degre...

AI Technical Summary

Problems solved by technology

[0003] 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

[0004] 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