Activated carbon adsorption-electrochemical regenerating method for treating non-degradable organic wastewater

Abstract

The invention discloses an activated carbon adsorption-electrochemical regenerating method for treating non-degradable organic wastewater. The method comprises the following steps: serially connecting an adsorption column A, an adsorption column B and an adsorption column C; filling the adsorption columns with activated carbon loading Fe and Mn catalysts, adsorbing organics in concentrated water and directly discharging generated water which reaches level A emission standard; monitoring the COD of discharged water of each column; after the first adsorption column A is penetrated through, namely, the discharged water COD of the first adsorption column A is equivalent to the entering water COD, regenerating activated carbon in the first adsorption column A with the second adsorption column B as the first adsorption column, the third adsorption column C as the second adsorption column and the adsorption column A filled with regenerated activated carbon as the third adsorption column, and continuously adsorbing organics in the concentrated water.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to an activated carbon adsorption-electrochemical regeneration method for treating refractory organic wastewater. Background technique [0002] There are many types and properties of refractory organic substances, and most of them are biologically toxic. How to efficiently and economically treat refractory organic pollutants has always been a research hotspot for environmental protection workers. Activated carbon adsorption is a relatively mature treatment technology that can adsorb most organic pollutants, but the adsorption only enriches the pollutants and does not achieve the degradation of organic matter. In addition, if the saturated activated carbon is not treated, it will cause secondary pollution. The existing activated carbon regeneration technology still has disadvantages such as low regeneration rate, high energy consumption, and poor versatility. It i...

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Problems solved by technology

However, the thermal regeneration method also has some disadvantages that cannot be ignored: 1) the loss rate of activated carbon after regeneration is high (5% to 10%); 2) the cost of regeneration energy consumption is high; 3) the chemical structure of the carbon surface changes, compared The surface area is reduced; 4) High temperature regeneration has high requirements for regeneration furnace materials, and the investment in regeneration furnace equipment is high; 5) Repeated regeneration will lose adsorption performance

The disadvantages are: 1) generally only for the regeneration of a single substance, and the versatility is poor; 2) there is the problem of secondary pollution of the regeneration solution; 3) the regeneration rate is low, the micropores are easy to block, and the regeneration rate drops significantly after repeated use

The thermal regeneration method has a high loss rate of activated carbon and high regeneration energy consumption. The chemical regeneration method has poor versatility, low regeneration efficiency, and secondary pollution of the regeneration solution. The biological regeneration method takes a long time and is not suitable for difficult organisms. degraded organic pollutants

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