Electrochemical regenerator and regenerating method for activated carbon

Abstract

An electrochemical device for regenerating activated carbon is composed of a casing, the first and the second hydraulic distribution plates for dividing the internal space of casing into water outlet chamber, electrochemical reaction chamber and water inlet chamber, the cathode on the inner surface of said electrochemical reaction chamber, and the central anode. Its regenerating method includes such steps as filling the activated carbon to be regenerated in the space between said anode and cathode, pumping the electrolyzing liquid into water inlet chamber to force it to flow from bottom to top for degradating the organic pollutant on the surface of activated carbon by the strong oxidizing substance generated by electric catalyzing.

Description

technical field [0001] The invention relates to an electrochemical regeneration device and method for granular activated carbon. Background technique [0002] Activated carbon is an amorphous carbon with well-developed pore structure, huge specific surface area and strong adsorption capacity. Due to its special microcrystalline structure and chemical structure, it has been widely used in gas purification, food and pharmaceutical industries since the 1950s. It has been widely used in liquid phase refining, catalyst preparation, urban sewage, industrial wastewater advanced treatment and other fields in the chemical industry. Therefore, the market demand for activated carbon has huge potential. At present, the annual production capacity of activated carbon in my country has reached more than 150,000 tons, while the world's activated carbon production has reached more than 800,000 tons. Due to the high cost of activated carbon, and if the used activated carbon is not recycled, ...

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Problems solved by technology

In general, the current electrochemical regeneration of activated carbon uses conventional electrodes such as Pt and graphite as the anode, and the filled activated carbon is in a fixed state, which has the following disadvantages: First, the oxygen evolution overpotential of conventional electrodes such as Pt and graphite is not high enough, and the anode It is easy to directly oxidize organic pollutants on the surface, but it is difficult to produce highly oxidizing hydroxyl radicals to indirectly oxidize organic pollutants. Therefore, it is difficult for organic substances on activated carbon to be completely oxidized and degraded, resulting in incomplete regeneration of activated carbon and insufficient efficiency.

The second is that the adsorption and desorption of activated carbon are confirmed to be controlled by intra-particle diffusion, and the process of adsorption and desorption is controlled by mass transfer. Therefore, the activated carbon is in a fixed state, resulting in slow regeneration speed and long regeneration time, which affects the economical efficiency of activated carbon regeneration.

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