Continuous wet oxidation process for degrading high concentration organic waste water and equipment thereof

Abstract

The invention discloses a continuous wet oxidation process for degrading high concentration organic waste water, belonging to the field of water treatment. The continuous wet oxidation process for degrading high concentration organic waste water comprises the procedures: a waste water pressurizing procedure: pressurizing waste water to be treated; a waste water heat exchange procedure: carrying out direct and / or indirect heat exchange on the pressurized waste water and treated waste water so the temperature of the pressurized waste water rises; an oxidizer pressurizing procedure: pressurizing an oxidizer; a mixing procedure: thoroughly mixing the pressurized and heated waste water with the pressurized oxidizer; a reaction procedure: causing the mixed waste water and the oxidizer to generate oxidation reaction, obtaining the treated waste water and generating gas; and a separation procedure: continuously separating the treated waste water from gas. The continuous wet oxidation process for degrading high concentration organic waste water has the advantages of high efficiency, less energy consumption, stability of operation and the like.

Description

technical field [0001] The invention belongs to the field of water treatment, and relates to a process and equipment for degrading high-concentration organic wastewater, in particular to a continuous wet oxidation process and equipment for degrading high-concentration organic wastewater. Background technique [0002] my country is a big country in the chemical industry, but there are still many deficiencies in the treatment of the "three wastes" in the chemical industry, especially the treatment of high-concentration organic wastewater. High-concentration organic wastewater contains a large number of chemical substances that are toxic and harmful to organisms, and biochemical methods often cannot degrade this type of wastewater. The common method is incineration, but high-concentration organic wastewater still contains a lot of water, which requires a lot of fuel consumption, and the incineration process will also generate waste gas and cause secondary pollution. [0003] W...

AI Technical Summary

Problems solved by technology

Wet oxidation mostly uses solid catalysts, and there are two main disadvantages. The first is that the active components will be lost gradually, or the active centers will be gradually inactivated due to the side effects of certain pollutants. Therefore, in engineering applications, the reaction tower must be opened regularly to replace the solid catalyst. , but the wet oxidation equipment is a pressure equipment, and it is inconvenient to disassemble; the second is that the solid catalyst often uses rare precious metals, which is expensive and limits industrial applications

[0004] Regarding the wet oxidation process, CN102452710A has adopted the intermittent wet catalytic oxidation method of solid catalyst, although the single-pot operation COD degradation rate is considerable, but there is no high efficiency and processing capacity of continuous process; The heat exchange load is particularly high at startup, limited by the capacity of the heat exchanger, it is generally very difficult to start; and once the tower is subjected to external fluctuations and the reaction temperature is too low, it cannot maintain the operation of the system by introducing additional heat from the outside, resulting in an oxidation reaction rate It will immediately decrease, which in turn will lead to an even lower outlet temperature, which will easily cause a chain reaction after circulation, making the temperature of the entire system too low, and eventually leading to the shutdown of the entire process

In addition, in order to overcome the problem of uneven gas distribution caused by the large amount of air used, a large amount of inert solid fillers are used in the reaction tank, thus occupying a large amount of limited reaction tank space and greatly reducing the utilization rate of the reaction tank space

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