A process method and device for resource utilization of semi-coke production wastewater

Abstract

The invention discloses a technological method and device for semi-coke production wastewater resource utilization. The technological method comprises three steps, namely deep oil-water separation, high-efficiency complexing extraction dephenolization and ammonia stilling, to be specific, firstly, separating and recycling a part of coal tar from wastewater when the wastewater passes through an oil partitioning tank, recycling coal tar in a precision filter and an oil-water separator in sequence after discharged water passes through a coarse filter; feeding the oil-removed semi-coke wastewater and an extraction agent into an extraction tower for extraction and dephenolization, feeding the extract phase and a sodium hydroxide solution into a reverse extraction tower for countercurrent contact reverse extraction, feeding an obtained sodium phenolate solution into an acidification kettle, and adding sulfuric acid for acidification to obtain crude phenol; feeding dephenolized wastewater discharged from the bottom of the extraction tower into a wastewater heater, feeding into an ammonia cyanogen separator to be mixed with hot air from an air heater to remove ammonia after being heated by fume from the air heater, and feeding an ammonia-containing mixed gas discharged from the top of the ammonia-cyanogen separator into an ammonia water cooler for cooling to obtain ammonia water. By adopting the method and the device, precious resources such as coal tar, phenol and ammonia can be recycled from the semi-coke production wastewater resource, and the biodegradability of the semi-coke wastewater is improved.

Description

technical field [0001] The invention relates to a coal chemical wastewater treatment device and method, in particular to a process method and device for resource utilization of semi-coke production wastewater. Background technique [0002] my country's energy structure is poor in oil, less in gas, and more in coal. In order to solve the contradiction between my country's resource structure and economic development and reduce dependence on crude oil, in recent years, the coal chemical industry has been actively developed in major coal-producing areas in my country, such as coal-based Oil projects, etc., are of great significance. Coal chemical industry has greatly improved the comprehensive utilization value of coal, but the wastewater produced in the production process of coal chemical industry has complex components and is difficult to treat. Therefore, the use of reasonable wastewater treatment technology is the guarantee for the coal chemical industry to embark on a benig...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method and device for resource utilization of semi-coke production wastewater, which can recover valuable resources such as coal tar, phenol, ammonia, etc. from semi-coke wastewater, improve the biodegradability of semi-coke wastewater, and overcome the current There are defects such as the semi-coke wastewater treatment technology does not recover the available resources in the semi-coke wastewater, and the existing semi-coke wastewater treatment technology has poor treatment effect, difficult biochemical treatment, and high operating costs.

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