Method and device for treating coking wastewater

Abstract

The invention discloses a method and device for treating coking wastewater. The purpose is to provide the method for treating the coking wastewater and meanwhile generating high value-added hydrogen to solve the problems of high toxicity, poor biodegradability and difficult treatment of the coking wastewater. According to the method, the treatment efficiency of the coking wastewater is high, the concentration change adaptive capacity of the coking wastewater is high, operating is continuous and stable, energy consumption and oxidizing agent materials are saved, and the high value-added hydrogen is generated.

Description

technical field [0001] The invention relates to a treatment method and device for coking wastewater, and specifically provides a continuous method for producing hydrogen fuel by partially catalytically oxidizing coking wastewater with supercritical water, which belongs to the field of supercritical water and sewage treatment. Background technique [0002] Coking wastewater has the characteristics of complex composition, high concentration, deep color, and high toxicity. In addition to oils, amines, and acids, it also contains a variety of refractory macromolecular benzene ring substances. The common characteristics of these substances are high toxicity, The composition is complex, the chemical oxygen consumption is high, and the biodegradability is poor. If these substances are discharged to the environment without treatment, they will seriously pollute the environment and threaten human health. [0003] At present, biological treatment is mostly used to treat this kind of w...

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Problems solved by technology

[0002] Coking wastewater has the characteristics of complex composition, high concentration, deep color, and high toxicity. In addition to oils, amines, and acids, it also contains a variety of refractory macromolecular benzene ring substances. The common characteristics of these substances are high toxicity, The composition is complex, the chemical oxygen consumption is high, and the biodegradability is poor. If these substances are discharged to the environment without treatment, they will seriously pollute the environment and threaten human health.

[0003] At present, biological treatment is mostly used to treat this kind of wastewater. Judging from the actual application of these processes at home and abroad, there are mainly problems such as long process flow, large amount of additives (such as pH adjustment agents, flocculation agents, etc.) and high cost. The reasons are: (1) Due to the chemical composition and structure of the compound itself, in the microbial community, there is no enzyme for the compound to be treated, making it resistant to degradation; (2) The waste water contains substances that are toxic to microorganisms or can inhibit microorganisms growing material (organic or inorganic), such that the organic material cannot degrade rapidly

[0004] Some studies have found that coking wastewater has a better oxidation effect when the supercritical water is treated with an excessive amount of oxidant and the temperature exceeds 600 ° C. The products are mainly carbon dioxide and water. This relatively high temperature treatment method not only consumes high energy consumption, but also A large amount of oxidant is required, and the treatment itself cannot achieve economic value. However, direct gasification usually produces hydrogen when the treatment temperature is about 600°C, but the reaction rate is slow, and a large amount of benzene ring substances in wastewater below 450°C cannot degrade the gas. At the same time, this experimental study also found that partial oxidation can be used to achieve rapid treatment of coking wastewater at around 400 °C, and at the same time produce high value-added hydrogen fuel

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