Method for biochemically treating electric plating waste water on basis of multi-dimensional strong oxidization and circulation

Abstract

The invention relates to a method for biochemically treating electric plating waste water on the basis of multi-dimensional strong oxidization and circulation, and belongs to the technical field of sewage treatment. According to the method, the electric plating waste water is injected into a regulating pool for water quantity regulation and water quality regulation and is then injected into multi-dimensional strong oxidization equipment; the strong oxidization process is electrocatalysis, electrocoagulation or electro-fenton; through electrode adsorption, heavy metal ions in the waste water are reduced. Meanwhile, the electrode can directly degrade a small number of organic matters in the waste water to generate carbon dioxide and water; cyanide in the waste water is decomposed into highly toxic gas (CN)2; the carbon dioxide, water vapor and the highly toxic gas (CN)2 are adsorbed and collected by the adsorption equipment; in the adsorption process, the highly toxic gas (CN)2 is dissolved in water vapor; the diffusion harm is avoided; after the strong oxidization treatment, the remained rich nutrition substances are degraded and consumed through two-stage circulation biochemical treatment; a sludge activation method is used for reducing the sludge total quantity; the sludge activation waste water is subjected to chemical adding flocculation and sedimentation; after the filtering, harmless treatment water is formed.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a method for treating electroplating wastewater based on multidimensional strong oxidation and cycle biochemistry. Background technique [0002] The sources of electroplating wastewater are generally: 1) cleaning water for plating parts; 2) waste electroplating solution; 3) other wastewater, including washing the floor of the workshop, scrubbing plate water, condensed water from ventilation equipment, and water caused by plating tank leakage or improper operation and management. Various tank fluids and drains for "running, escaping, dripping, and leaking"; 4) equipment cooling water. The water quality and quantity of electroplating wastewater are related to factors such as the process conditions of electroplating production, production load, operation management, and water use methods. The water quality of electroplating wastewater is complex and its composition is diffi...

AI Technical Summary

Problems solved by technology

The water quality and quantity of electroplating wastewater are related to factors such as the process conditions of electroplating production, production load, operation management, and water use methods. The water quality of electroplating wastewater is complex and its composition is difficult to control. It contains chromium, cadmium, nickel, copper, zinc, gold, and silver. Some are carcinogenic, teratogenic and mutagenic highly toxic substances

[0003] Electroplating wastewater is generally treated by physical and chemical methods, and there are many treatment methods, but few of them can reach the standard stably. Among them, the best effect is DTCR-heavy metal ion trapping agent, which forms a large Molecular chelates, and then through flocculation, can achieve the purpose of removing heavy metal ions in electroplating wastewater, but the cost of the ion trapping agent is relatively high, and it is necessary to analyze the water quality of electroplating wastewater during operation, and carry out complex calculations. implementation, but the existence of errors still cannot be avoided, there are still more or less heavy metal ions in the treated wastewater, and more detailed calculations and operations are required for further treatment, and the cyanide in the wastewater has not been removed in large quantities. It still exists in wastewater, and under certain conditions, cyanide can also react with residual heavy metal ions to form highly toxic substances. The treated wastewater is extremely unstable and cannot be used for drinking or watering plants. , therefore, the existing technology can not meet the requirements of harmless treatment of electroplating wastewater, further research on the treatment of electroplating wastewater is needed

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