Method for treating highly-difficult-to-treat industrial wastewater through catalytic oxidation and micro-electrolysis

Abstract

The invention relates to a wastewater treatment method, in particular to a wastewater treatment method through catalytic oxidation and micro-electrolysis. The wastewater treatment method comprises the following steps of: 1, iron and carbon pretreatment; 2, micro-electrolysis reaction: regulating pH (potential of hydrogen) of wastewater to 2-3 by using acid, feeding pretreated iron chips and pretreated activated carbon according to weight ratio of the iron chips to the activated carbon being 1:1 and ratio of the total weight of the iron chips and the activated carbon to the weight of the wastewater being 1:3, conducting aeration by using compressed air, adding H2O2 according to ratio being 1 / 1000 when pH reaches 4-5, stopping reaction till pH reaches 6, draining the wastewater into an intermediate pond and adding polyacrylamide (PAM) for settlement; and 3, catalytic oxidation: after settlement, feeding the wastewater into a reaction pond with an agitator, regulating pH to 3-4 by using acid, adding powder activated carbon and 4A molecular sieves according to ratio being 0.2 / 1000, then adding oxidant H2O2 according to ratio being 2.1 / 1000, keeping reaction for 60min, and after the reaction is stopped, regulating pH to 6-7 by using NaOH solution and adding PAM for settlement. The method for treating highly-difficult-to-treat industrial wastewater through catalytic oxidation and micro-electrolysis has the advantages that the treatment effect of the highly-difficult-to-treat industrial wastewater can be improved and the application scope is wide.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a wastewater treatment method comprising catalytic oxidation and micro-electrolysis treatment steps. Background technique [0002] In recent years, with the rapid development of my country's industry, a large amount of organic industrial wastewater that is extremely difficult to treat has been produced, referred to as: highly difficult industrial wastewater. This type of wastewater has the following characteristics: first, the composition is complex, and the molecular chain is strong, it is difficult to biodegrade; the second is COD cr high, normal COD cr From more than 10,000 mg / L to hundreds of thousands of mg / L; third, high chroma, ranging from thousands to tens of thousands of times; fourth, this type of wastewater is highly toxic and seriously harmful to the environment, and cannot be treated to meet standards with traditional techniques; The reason is that the amount of th...

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Problems solved by technology

[0020] 1. The COD degradation of wastewater with high treatment difficulty is poor, only 30-40%, especially the wastewater with high salt content is even worse;

[0021] 2. There is a lot of sediment, which increases the workload of the post-processing process and increases the processing cost;

[0022] 3. Micro-electrolytic iron and carbon are easy to harden, resulting in channeling and reducing the treatment effect

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