A kind of blue carbon wastewater treatment process

Abstract

A process method for treating semi-coke wastewater, the process method comprising the following steps: 1) deamination, using a deammonization tower to remove ammonia nitrogen in the raw material semi-coke wastewater to obtain deammonia wastewater; 2) extraction, using an extractant to process Step 2) The deamination wastewater obtained from the treatment is subjected to countercurrent extraction in the extraction tower, and the extraction phase and the raffinate phase are respectively obtained after the extraction is completed; 3) The phenol oil is recovered, and the extraction phase obtained in step 2) is carried out in the phenol oil recovery tower. Negative pressure rectification, the extractant extracted from the top of the tower is condensed and separated to obtain the recovered extractant, the product phenol oil is extracted from the tower reactor, 4) the extractant is recovered, and the raffinate phase obtained in step 2) is carried out in the solvent recovery tower Rectification, the top fraction is condensed and phase-separated, and the organic phase is used as the recovered extraction agent, the water phase is refluxed, and the liquid in the bottom of the tower is taken out as treated purified water and sent to the subsequent process.

Description

technical field [0001] The invention relates to a pretreatment process and method for waste water produced in the production process of coal chemical enterprises, especially waste water with high ammonia nitrogen concentration, a large amount of phenols, oils and other complex organic components produced by semi-coke enterprises. Background technique [0002] Semi-coke wastewater is the wastewater produced during the medium and low temperature dry distillation (500-650°C) of coal, mainly from the circulating water for cooling and washing the gas and the separated water in the chemical production process. Semi-coke is a medium-low temperature dry distillation product of coal. During its production process, a large amount of tar and low-molecular organic matter are produced. Therefore, the wastewater contains a large amount of pollutants that have not been oxidized by high temperature, and its concentration is 10% higher than that of conventional coking wastewater. times, espe...

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Problems solved by technology

However, this process is not ideal for the treatment of semi-carbon wastewater with a high oil / phenol ratio.

[0006] In Chinese literature—the impact of different dephenolic extractants on the biodegradability of waste water after stripping (Huang Huihua et al., Guangzhou Chemical Industry, February 2014, 103-104) discloses the use of methyl isobutyl ketone, butyl acetate, The extraction effect of one or two mixtures of diisopropyl ether on phenol wastewater, and pointed out that the extraction effect of the mixed extractant of methyl isobutyl ketone and butyl acetate 1:1 is better, and the extraction of wastewater after extraction The biodegradability is high, but due to the high oil / phenol ratio in semi-coke wastewater, we found that the overall effect is not ideal when using the mixed extractant of the above ratio to extract the wastewater after deamination, so we provide a The treatment method of new semi-carbon wastewater becomes a problem to be solved in the prior art

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