Deoiling-dephenolization combined treatment method for high-concentration phenol ammonia wastewater and system

Abstract

The invention relates to a deoiling-dephenolization combined treatment method for high-concentration phenol ammonia wastewater and a system. The treatment method comprises the following steps: (1) carrying out gas floating deoiling on a coke oven flue gas; (2) carrying out oil-water separation; (3) carrying out pressurized extraction dephenolization. A treatment system comprises a gas floating tank, an oil-water separator, an extraction device, a recycling tank and a flue gas buffer tank. As the coke oven flue gas is adopted as a foaming gas, the deoiling efficiency can be improved by virtue of nonpolar characteristics of carbon dioxide in the coke oven flue gas and the waste heat of the coke oven flue gas, and the acid gas carbon dioxide can be subjected to saturated absorption while deoiling is carried out; by changing the pH value of a solution, phenolate in wastewater can be induced to release phenolic substances of rich molecule modes, the allocation coefficient of the phenolic substances in an extraction agent can be increased, and the extraction efficiency can be improved; finally, through synergetic effects of gas floating deoiling and acidification and extraction procedures, the wastewater treatment efficiency is greatly improved, and three purposes can be achieved with one stroke.

Description

technical field [0001] The invention relates to the technical field of oil removal and dephenolization of phenolic ammonia wastewater, in particular to a combined treatment method and system for oil removal and dephenolization of high-concentration phenolic ammonia wastewater. Background technique [0002] High-concentration phenol-ammonia wastewater mainly comes from industrial industries such as coal chemical industry, petrochemical industry, and coking chemical industry. This type of wastewater contains a large amount of tar, phenol, ammonia and other substances, with complex components. It is a high-concentration toxic and refractory organic industrial wastewater. Direct discharge will cause serious pollution environment, and even pollute drinking water sources, causing great harm to the human body. However, the phenolic substances contained in phenolic ammonia wastewater are important chemical raw materials, which can be recycled as resources. Therefore, efficient treat...

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Problems solved by technology

The process mainly has the following problems: (1) before the extraction, the extraction water quality is alkaline, the dephenolization effect is not good, and the waste water is heated, cooled and heated again, and the energy consumption is high; (2) the extraction efficiency of polyphenols is low , affecting the progress of subsequent biochemical stages

This process is the development direction of high-concentration phenolic ammonia wastewater treatment in recent years, but this process requires the removal of suspended solids and tar in advance for high-concentration phenolic ammonia wastewater, and a separate acid gas saturation process, which not only reduces the efficiency of wastewater treatment, but also Increased wastewater treatment costs

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