Treatment method of citric acid cleaning waste liquid

Abstract

The invention relates to a treatment method of citric acid cleaning waste liquid. The method comprises the following steps: (1) complex breaking treatment: collecting citric acid cleaning waste liquidin a first waste liquid treatment tank, adding a complex breaking agent into the first waste liquid treatment tank, uniformly stirring, carrying out complex breaking reaction, standing, settling andcarrying out solid-liquid separation after the reaction is finished, so as to obtain a supernatant and colloidal precipitate, and pumping the supernatant into a second waste liquid treatment tank; and2) catalytic oxidation treatment: adding a solid catalyst and an oxidant into the second waste liquid treatment tank, and carrying out an oxidation reaction to reduce the COD content of the treated supernatant to 40-50 mg / L. Compared with the prior art, the method has the following advantages and beneficial effects that complex breaking treatment and catalytic oxidation treatment are adopted, andthe advantages of the two steps of treatment are integrated, so that the removal rate of COD is extremely high and can reach 98% or above; the method has the advantages of simple process, short treatment flow, convenience in operation, small medicament addition amount and simple used equipment, and has very good economic benefits.

Description

technical field [0001] The invention relates to a method for processing chemical cleaning liquid of equipment and pipelines, in particular to a method for processing citric acid cleaning waste liquid. Background technique [0002] Pickling is a relatively important link in chemical cleaning. Compared with inorganic acids, the corrosion inhibition of citric acid is more prominent, but the acidity of citric acid is relatively weak, so the corrosion of equipment The safety and reliability of citric acid cleaning are relatively strong. With its special physical and chemical properties, citric acid and its derivatives have a wide range of applications in many fields such as chemical cleaning. They are used in equipment and pipelines in many industries. Carry out cleaning before driving and inspection and maintenance. [0003] Citric acid is a trivalent acid. In the pickling process, it is not directly used to react with various equipment and pipeline adhesions to achieve the pur...

AI Technical Summary

Problems solved by technology

The general disadvantages of these methods are: huge equipment or economic investment, low utilization rate of equipment, and even substandard treatment, etc., which will bring adverse effects to the service party

However, the patent process is complicated, requires more equipment, and occupies a larger area; and the patent does not have a clear method for removing ammonia nitrogen

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