Salt-containing wastewater recycling device and process

Abstract

The invention relates to a salt-containing wastewater recycling device and process. The device comprises an electrolytic cell, a hydrogen post-treatment device and an external COD detection device, wherein the electrolytic cell is provided with a COD removal electrode group, a hydrogen production electrode group and a diaphragm for isolating an anode chamber from a cathode chamber, the electrolytic cell is provided with a salt-containing wastewater inlet and an electrolytic solution outlet, and the hydrogen post-treatment device is connected to the cathode chamber of the electrolytic cell. According to the process, salt-containing wastewater is discharged into an electrolytic cell after COD detection, and when the COD of the salt-containing wastewater is larger than or equal to 10 mg / L, aCOD removal electrode group is started; when the COD of the salt-containing wastewater is lower than 10 mg / L, a hydrogen production electrode group is opened, and the COD removal electrode group is closed; and after electrolysis of the hydrogen production electrode group, chlorine is generated in an anode chamber, and hydrogen is generated in a cathode chamber. By adopting the method to recycle salt-containing wastewater, the damage of the salt-containing wastewater to the ecological environment can be reduced, and the available hydrogen and sodium hypochlorite solution can be obtained at thesame time.

Description

technical field [0001] The invention belongs to the technical field of clean energy preparation, and relates to a process for producing hydrogen by electrolyzing water, in particular to a device and process for producing hydrogen by electrolyzing saline wastewater while by-producing sodium hypochlorite. Background technique [0002] In recent years, due to the gradual exhaustion of fossil energy and other primary energy sources, hydrogen energy has gradually been favored by people because of its clean, efficient and abundant sources. Hydrogen can be produced by using fossil energy such as coal and petroleum, or by electrolysis of water. Among them, the raw material for hydrogen production by electrolysis of water is generally saline wastewater. The production process only consumes electric energy and produces almost no waste. It is a green and environmentally friendly hydrogen production technology. [0003] Many industries will produce saline wastewater. Due to the continu...

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Problems solved by technology

However, the process of this method is complicated. In the process, reagents such as acid and alkali need to be added to adjust the pH, which consumes chemicals and the value of the obtained product is not high.

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