Complete equipment and process for processing coal tar wastewater

Abstract

The invention provides complete equipment and process for processing coal tar wastewater, and belongs to the technical field of environmental conservation. The process comprises the following steps of: adopting different removal principles according to different physicochemical properties of heavy oil, light oil and emulsified oil; scientifically and orderly removing the heavy oil, light oil and emulsified oil through three sets of environmental conservation equipment such as a multi-stage oil separator, an oil-water separator and an air floating tank gradually; combining a micro electrolysis reactor with a five-section integrated oxidization device; and firstly destroying a benzene ring by microelectrolysis, and then strongly oxidizing various organic matters through an oxidant, so that the COD (chemical oxygen demand) and the chromaticity are greatly reduced. Ammonia nitrogen can be efficiently removed by a denitrification system; the denitrification system is low on requirements of pH value and temperature, and low in operation cost; the denitrification system is arranged behind the five-section integrated oxidization device; the reaction change of power of hydrogen is fully considered; and the complete equipment complies with the scientific principle, and can be used for reducing feeding of acid and alkali, and lowering the operation cost.

Description

technical field [0001] The invention relates to a complete set of coal tar sewage treatment equipment and technology, belonging to the technical field of environmental protection. Background technique [0002] Coal tar sewage has six notable features: 1. Contains a large amount of heavy oil, light oil and emulsified oil. 2. High content of organic matter. 3. The composition of pollutants is extremely complex. 4. Most of the pollutants are substances that cannot be biochemically treated. 5. Deep chroma. 6. High content of ammonia nitrogen. [0003] At present, there are many coal tar sewage treatment methods, and the most commonly used treatment process is "ammonia distillation + A / O", that is, the steam stripping method is used to distill ammonia first, so that the remaining ammonia water with an ammonia nitrogen concentration of about 4000-6000mg / l is reduced to 300mg / l or so (if it does not reach 300mg / l, it will be diluted with doubled water), and then continue with...

AI Technical Summary

Problems solved by technology

2. High content of organic matter

3. Pollutant components are extremely complex

4. Most of the pollutants are substances that cannot be biochemically treated

5. Deep chroma

6. High content of ammonia nitrogen

The disadvantages of this treatment process are:

[0005]2. The A / O method has strict requirements on the water inlet conditions

[0015]The treatment effect of chlorination method is stable, not affected by water temperature, less investment, but high operating cost, by-products chloramines and chlorinated organic compounds will cause secondary pollution

The chlorination method is only suitable for treating low-concentration ammonia nitrogen wastewater

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