Treatment method of ethanolamine waste liquid

Abstract

The invention discloses a treatment method of ethanolamine waste liquid, which comprises the following steps: directly feeding ethanolamine waste liquid into an evaporation and concentration unit, feeding steam obtained by evaporation and concentration into a condensation unit, introducing heat exchanged by condensation into the evaporation and concentration unit to preheat the waste liquid, and feeding condensate obtained by condensation into an electrocatalytic oxidation unit; feeding effluent subjected to electrocatalytic oxidation degradation treatment into a refinery sewage treatment plant; and feeding an evaporated and concentrated organic residue concentrated solution into an incineration unit for incineration, and introducing heat generated by incineration into the evaporation and concentration unit to evaporate the waste liquid, so as to complete the treatment process of the ethanolamine waste liquid. The treatment method provided by the invention is clean and economical, heat generated by condensation heat exchange and incineration is fully utilized to evaporate the waste liquid, the energy consumption of waste liquid treatment is greatly reduced, water quality indexes such as ammonia nitrogen, total nitrogen and COD (Chemical Oxygen Demand) of discharged sewage after treatment are remarkably reduced, and the biodegradability is greatly improved; and finally, the inlet water quality requirement of a refinery sewage treatment plant can be met.

Description

technical field [0001] The invention relates to a sewage treatment method and device, in particular to a treatment method for ethanolamine waste liquid, which belongs to the technical field of industrial sewage treatment. Background technique [0002] In recent years, with the increase in the processing of sulfur-containing crude oil in my country, the refinery gas produced during the processing contains a series of sulfur-containing gases. Whether it is used as fuel, chemical raw materials or high-octane gasoline components, it needs to be desulfurized and refined. , and with the increasingly stringent environmental protection requirements, the sulfide content in refinery gas is required to be lower and lower. my country's refineries often use the ethanolamine method to treat sulfur-containing refinery gas, and then use the Claus device to produce sulfur. In this process, a large amount of production wastewater and maintenance wastewater are generated. Among them, the maint...

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Problems solved by technology

At present, there is no economical, applicable, and effective treatment method that is widely recognized by everyone, and the direct burning treatment costs as high as 1150 yuan / m 3 , the treatment cost is too high, with the generation of toxic and harmful gases, and the resource utilization of the waste liquid itself is not fully utilized; biochemical, physical and chemical or advanced oxidation is also a common treatment method after dilution to a certain concentration, in which tap water is used to dilute COD to 400mg / L or so before biochemical treatment, the cost is also 200 yuan / m 3 However, the use of tap water to dilute not only greatly increases the total amount of sewage, but also causes a serious waste of water resources, which is not in line with the current concept of clean, economical, and low-carbon development.

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