Method for regenerating active carbon for gold mine wastewater by using hydroxyl radical

Abstract

The invention discloses a method for regenerating active carbon for gold mine wastewater by using hydroxyl radical. According to the method, gold mine wastewater is adsorbed with active carbon; aftercyanide, thiocyanate, heavy metals and xanthate are removed, the active carbon achieves a saturated adsorption state; the active carbon is soaked with tap water or clear water; the active carbon is subjected to powerful gas-water double backwashing treatment by matching a backwashing device and an air blowing device to remove suspended solids, particulate matters and salts from the surface of theactive carbon; and the pollutants on the surface, the inner transition pores and the inner micropores of the active carbon can be rapidly removed and decomposed within several tens of minutes by usingthe hydroxyl radical to restore the adsorption function of active carbon, such that the double cleaning on the surface and the interior of active carbon can be achieved so as to prepare for the nextround of adsorption cycle; and the method integrates the active carbon adsorption treatment process and the active carbon regeneration treatment process, can perform regeneration without the removal of carbon particles from towers, can greatly increase the service life of active carbon, and further has advantages of time saving, labor saving, convenient operation and economic benefit improving.

Description

technical field [0001] The invention relates to the field of pollution control of gold mine wastewater, in particular to a method for regenerating active carbon used in gold mine wastewater by hydroxyl radicals. Background technique [0002] Gold mine wastewater has the characteristics of high salt and high COD, and contains a large amount of cyanide, thiocyanide, heavy metals, xanthate and other pollutants. Using activated carbon to treat gold mine wastewater has low cost and good effect, but activated carbon is very easy to saturate and requires Regeneration can maintain the effect of gold mine wastewater treatment and ensure economic and environmental benefits. Conventional activated carbon regeneration technologies, such as traditional high-temperature heat source regeneration methods (steam activation furnaces, microwave regeneration furnaces, and high-temperature regeneration methods), consume large amounts of energy, The operation is troublesome and the effect is poor...

AI Technical Summary

Problems solved by technology

[0002] Gold mine wastewater has the characteristics of high salt and high COD, and contains a large amount of cyanide, thiocyanide, heavy metals, xanthate and other pollutants. Using activated carbon to treat gold mine wastewater has low cost and good effect, but activated carbon is very easy to saturate and requires Regeneration can maintain the effect of gold mine wastewater treatment and ensure economic and environmental benefits. Conventional activated carbon regeneration technologies, such as traditional high-temperature heat source regeneration methods (steam activation furnaces, microwave regeneration furnaces, and high-temperature regeneration methods), consume large amounts of energy, The operation is troublesome, the effect is poor, the regeneration effect of the chemical agent method (acid-base method) is poor, and the regeneration of the ordinary chemical oxidation method is not complete, resulting in unsatisfactory effects of gold mine wastewater pollution control

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