High-concentration organic wastewater wet oxidation treatment system and method

Abstract

The invention discloses a high-concentration organic wastewater wet oxidation treatment system, which is integrated by an oxygen generating device, a pretreatment device, a heat conducing oil heating device, a wet oxidation treatment device, a cooling pressure reduction device, a gas-liquid separation device, a tail gas treatment device and the like. The invention also discloses a method for treating high-concentration organic wastewater by the system. Compared with the prior art, the system has the advantages that the transportation and the installation are convenient; the integration performance is good; the system fully recovers and utilizes heat after reaction through a multistage heat exchanger for preheating waste water and oxygen, so that the operation cost can be reduced; through the oxygen generating device, air is used as raw materials for preparing high-purity oxygen on site for wet oxidation reaction, so that the contaminant removing efficiency can be improved; the wet oxidation reaction device made of duplex metal composite materials is used, and a catalyst box is arranged inside the reaction device, so that the corrosion resistant capability of the reaction device is favorably improved, and the reaction conditions are reduced. The system can realize reaction device slag discharging in the operation process, so that the risk of system scale formation and blockage is favorably reduced, and the system can be widely applied to the treatment of high-concentration difficult-to-degrade organic wastewater.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a wet oxidation treatment system and method for high-concentration organic waste water. Background technique [0002] In recent decades, with the rapid development of industrialization, environmental pollution has become increasingly serious, especially water pollution. In my country, water pollution mainly comes from refractory industrial sewage, especially sewage from petroleum, chemical, pesticide and other industries, which has the characteristics of high concentration, complex composition, toxic and harmful, and poor biodegradability, which makes the traditional biodegradation process suffer. serious challenge. In addition, the large-scale application of membrane technology in recent years has led to the further concentration of high-concentration industrial sewage, and the resulting concentrated solution has a greater threat to humans and the environment...

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Problems solved by technology

[0004] At present, there are a series of problems in the actual industrial application of wet oxidation technology: (1) The oxidant commonly used in the process is air, the oxygen content in the air is about 20%, and the rest is nitrogen that does not participate in the reaction, so a large flow of air needs to be delivered to the reaction Therefore, larger compressors are required, and the investment cost of equipment is high. At the same time, the oxidation effect is not as good as that of pure oxygen, which also has a negative impact on the cost of tail gas treatment; The treatment effect of refractory substances such as small molecule organic acids and small molecule organic acids is poor; the main research direction at present is to prepare catalysts with high activity and high stability to improve conversion efficiency, and the second is to combine effluent with MVR, biochemical and other methods. Secondary treatment of wet oxidation effluent; (3) tail gas problem, the composition of tail gas discharged from the wet oxidation system varies with the change of the treatment medium and process conditions, the main component is N 2 and CO 2 , generally have irritating odor and volatile organic gas, must be treated

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