Treatment method of edta cleaning waste liquid and its corresponding reaction device

Abstract

The invention discloses an EDTA (ethylene diamine tetraacetic acid) cleaning waste liquid processing method and a corresponding reaction device. The processing method comprises the following two steps: step 1, using an alkali-acid method for recovery of EDTA in an EDTA cleaning waste liquid, to be more specific, first, a 20%NaOH solution is added for precipitation of metal ions in the EDTA cleaning waste liquid, and then 1:1H2SO4 is added for crystallization of the EDTA in the EDTA cleaning waste liquid; and step 2, using a degradation method for photocatalytic degradation processing of the waste liquid with the EDTA recycled, to be more specific, under the condition of ultraviolet (UV) irradiation, a mixture solution (namely Fenton reagent) of H2O2 with a mass fraction of 30% and 0.5mol / L Fe<2+> and nano TiO2 powder are added into the EDTA cleaning waste liquid, and the reaction is carried out in a self-made light reaction device which comprises a water outlet (1), an organic glass outer wall (2), a reaction pool (3), an ultraviolet lamp tube (4), a quartz socket tube (5) and an aeration device (6).

Description

technical field [0001] The invention belongs to the field of sewage treatment. Specifically, the invention relates to a treatment method for EDTA cleaning waste liquid and a corresponding reaction device. Background technique [0002] No matter what kind of water treatment measures are adopted for the boiler system of power plant, the corrosion and scaling speed can only be controlled within the allowable range, but the hidden dangers of corrosion and scaling cannot be completely eliminated. Therefore, the boiler system should be chemically cleaned regularly, among which ethylenediaminetetraacetic acid (EDTA) is one of the most effective chemical cleaning agents commonly used. The COD content in the wastewater produced after washing with EDTA is very high. EDTA is an ethylenediamine derivative and is difficult to biodegrade. Although it is non-toxic, it will increase the oxygen consumption and affect the survival of organisms in the water body if it is discharged into the wa...

AI Technical Summary

Problems solved by technology

The COD content in the wastewater produced after washing with EDTA is very high. EDTA is an ethylenediamine derivative and is difficult to biodegrade. Although it is non-toxic, it will increase the oxygen consumption and affect the survival of organisms in the water body if it is discharged into the water body. Therefore, corresponding treatment must be carried out before the discharge of EDTA cleaning waste liquid to meet the standard of waste water discharge

[0003] At present, there are many methods for treating EDTA cleaning waste liquid, mainly including furnace incineration method, physical adsorption method (membrane method, activated carbon method, ultrasonic method, etc.), biochemical method (biodegradation method), chemical oxidation method (photooxidation method) , electrochemical method, etc.), but these methods generally have problems such as long processing time, high processing difficulty, poor processing effect or high processing cost. In order to solve the above problems, it is necessary to invent a method for efficiently processing EDTA cleaning waste liquid

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