Internal circulating fluidized bed type supercritical water oxidizing system for degradation-resistant organic wastewater

Abstract

The invention discloses an internal circulating fluidized bed type supercritical water oxidizing system for degradation-resistant organic wastewater. The internal circulating fluidized bed type supercritical water oxidizing system is characterized in that the degradation-resistant organic wastewater in a wastewater buffer tank flows into an internal circulating fluidized bed reactor via a materialpump, and generates supercritical water oxidization reaction with air which is used as an oxidant, and the reaction is promoted by a dosage pump and a catalyst which is stored into a dosage tank; onone hand, the inorganic salt, the catalyst and other residues flow into the residue storage tank after reaction, the inorganic salt is dissolved by softened water, and then separated from the catalyst, and the catalyst flows into the dosage tank again; on the other hand, the high-temperature fluid after reaction is separated by a high-temperature cyclone separator, the separated catalyst solid issent into the internal circulating fluidized bed reactor, and the high-temperature fluid flows into the wastewater storage tank to preheat the fresh material. The internal circulating fluidized bed type supercritical water oxidizing system has the advantages that the inorganic salt and the catalyst can be separated at high efficiency; the catalyst can be recycled, so that the economy of the wholesystem is improved.

Description

【Technical field】 [0001] The invention relates to the field of supercritical water treatment of organic waste, in particular to an internal circulating fluidized bed type supercritical water oxidation system for refractory organic waste water. 【Background technique】 [0002] In recent years, with the rapid development of industry, the discharge of industrial wastewater has been increasing year by year. In 2016, the national industrial wastewater discharge exceeded 20 billion tons, of which the annual discharge of pesticide wastewater exceeded 300 million tons, and the annual discharge of medical wastewater exceeded 530 million tons, and the annual discharge of printing and dyeing wastewater exceeds 2 billion tons. It is difficult to degrade, and generally has the characteristics of high concentration of organic pollutants, high ammonia nitrogen and high inorganic salts. Organic wastewater has complex components, high concentration of organic matter, high salt content, high P...

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Problems solved by technology

[0009] The purpose of the present invention is to provide an internal circulating fluidized bed supercritical water oxidation system for refractory organic wastewater, which can effectively solve the difficulty of intermediate products such as ammonia nitrogen and other intermediate products caused by refractory organic wastewater such as high concentration, high ammonia nitrogen, and high salt. Efficient removal, salt deposition, waste of catalyst, difficult separation of salt and catalyst, etc.

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