Method for synchronously removing salt and organic matters based on hierarchical hydrophobic/hydrophilic electrodes and device thereof

Abstract

The invention provides a method for synchronously removing salt and organic matters based on a hierarchical hydrophobic / hydrophilic electrode and a device thereof, the device comprises a device body and an electrode arranged on the device body, and the electrode has a hierarchical hydrophobic and hydrophilic structure. The implementation mode of the hierarchical hydrophobic and hydrophilic structure comprises at least one of the following mode 1 and mode 2: a mode 1: an electrode material of the electrode comprises a porous composite material, and the porous composite material comprises hydrophilic porous carbon and a hydrophobic layer existing on the surface of the hydrophilic porous carbon; the hydrophobic layer comprises a hydrophobic conductive polymer layer formed by a hydrophobic conductive polymer and / or a hydrophobic modified metal compound layer; a mode 2: the electrode material comprises a hydrophilic porous carbon layer formed by hydrophilic porous carbon and a hydrophobic layer located on the surface of the hydrophilic porous carbon layer, and the hydrophobic layer comprises a hydrophobic conductive polymer layer formed by a hydrophobic conductive polymer and / or a hydrophobically modified metal compound layer. According to the invention, salt components and organic matters in the wastewater can be synchronously and efficiently removed.

Description

technical field [0001] The invention relates to wastewater treatment, in particular to a method and device for synchronously desalting and degrading organic matter with layered hydrophobic / hydrophilic electrodes. Background technique [0002] With the development of industry, the production of high-salt organic wastewater in the chemical industry is increasing year by year. This kind of wastewater has complex components, high toxicity and poor biodegradability. If it is discharged without effective treatment, it will seriously damage the soil ecology and pollute rivers and groundwater resources. Therefore, research and development for A water treatment method for such saline organic wastewater is necessary. [0003] Saline organic wastewater contains two types of pollutants: inorganic salts and organic matter. During conventional treatment, these two types of pollutants will interfere with each other and affect the treatment effect. Specifically, if the common biochemical me...

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Problems solved by technology

[0002] With the development of industry, the production of high-salt organic wastewater in the chemical industry is increasing year by year. This kind of wastewater has complex components, high toxicity and poor biodegradability. If it is discharged without effective treatment, it will seriously damage the soil ecology and pollute rivers and groundwater resources. Therefore, research and development for The water treatment method of this type of saline organic wastewater is necessary

[0003] Saline organic wastewater contains two types of pollutants: inorganic salts and organic matter. During conventional treatment, these two types of pollutants will interfere with each other and affect the treatment effect. Specifically, if the common biochemical method is used directly for treatment, the waste water Salt substances will inhibit the biochemical degradation of microorganisms and affect the treatment effect. When conventional salty wastewater treatment methods such as ion exchange, electrodialysis, reverse osmosis, and evaporation (single-effect evaporation, multi-effect evaporation, and mechanical vapor compression, etc.) are used, The organic matter in the wastewater will pollute structures or materials such as membranes or resins, and also cause problems such as foaming and sticky scale, which will eventually lead to the failure of the above-mentioned desalination process

Therefore, how to remove the mutual interference between salt and organic matter in the treatment process is the key to the treatment of high-salt organic wastewater, and most of the current treatment methods for salt-containing organic wastewater (especially high-salt organic wastewater) can only target salt or organic matter. It is impossible to realize the simultaneous removal of the two, and when processing the two or one of them, there are often problems such as the above-mentioned interference between the two and the resulting poor processing effect

[0004] For example, the Chinese patent document CN109354241A discloses a zero-discharge treatment system and method for industrial high-salt wastewater rich in refractory organic matter. The method combines electrodialysis technology and advanced oxidation technology to achieve desalination and degradation of organic matter through different unit operations. purpose, but the organic matter will seriously affect the service life of the electrodialysis membrane, and the oxidation method adopted in the method is prone to free radical quenching reaction of chloride ion, which affects the effect of advanced oxidation treatment; Chinese patent document CN108409050A discloses a kind of high-salt wastewater Zero discharge treatment process, this method uses the A / O biochemical system to remove organic pollutants, and obtains high-concentration salt retentate through reverse osmosis and nanofiltration, and obtains high-purity salt crystals after subsequent treatment. However, the biochemical treatment process is easy. Affected by the salt content of wastewater, high salt concentration is not conducive to the biochemical process. At the same time, organic matter and impurities in the water can easily lead to clogging in reverse osmosis and nanofiltration processes, increasing operating costs

[0005] In terms of electrochemical methods for co-processing salt-containing organic wastewater, Chinese patent document CN104671364A discloses an electrochemical wastewater treatment method for synchronous desalination and refractory organic matter removal. and anode potential to generate active components to oxidize and remove refractory organics. This method requires the addition of iron salts, which will cause secondary pollution of iron sludge. At the same time, the electrochemical polarization problem in the process of generating active components at the cathode and anode will cause electrode failure and electrode pollution. The problem is that the free radicals and salt ions produced by the active components will also undergo quenching reactions, producing toxic by-products, which interfere with the degradation of organic matter; The method, under the condition of an external electric field (<2V), removes heavy metals and organics at the same time by coupling electrostatic adsorption and electrocatalytic oxidation degradation. When there is a limited effect of degrading organics in this method, organics will cause electrode pollution and cause electrode failure. And other issues

[0006] Regarding the cooperative treatment of salt-containing organic wastewater by electrochemical methods, Chinese patent CN104671364A discloses an electrochemical wastewater treatment method for synchronous desalination and refractory organic matter removal, using porous carbon materials with high specific surface area for desalination by electrosorption, and at the same time controlling the cathode and The anode potential generates active components to oxidize and remove refractory organics, but this method requires the addition of iron salts, which will cause secondary pollution of iron sludge and increase the burden of salt removal. At the same time, the electrochemical polarization problem in the process of generating active components at the cathode and anode will cause electrode failure and electrode pollution, the free radicals and salt ions produced by the active components will also undergo quenching reactions, producing toxic by-products and interfering with the degradation of organic matter; Chinese patent CN108423776A discloses a capacitive deionization coupled electrode Catalytic synergistic removal of heavy metals and organics. This method uses conductive carbon as the electrode substrate and supports catalytic materials on the electrode substrate for the removal of copper ions and citric acid. However, the removal efficiency of copper ions and citric acid needs to be further improved.

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