Method and device for treating industrial wastewater by multi-stage wet oxidation

A technology for industrial wastewater and wet oxidation, applied in oxidized water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve high energy consumption, low efficiency of industrial wastewater treatment, and increase of industrial wastewater treatment cost and other issues to achieve the effect of improving processing efficiency and reducing energy consumption

Active Publication Date: 2018-01-12
TONGJI UNIV
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Problems solved by technology

However, the current wet oxidation treatment equipment has low treatment efficiency for industrial wastewater and high energy consumption, which increases the cost of industrial wastewater treatment

Method used

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  • Method and device for treating industrial wastewater by multi-stage wet oxidation

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Embodiment 1

[0032] A method for multi-stage wet oxidation treatment of industrial wastewater, mainly composed of a three-stage oxidation process, the temperature of the primary oxidation is lower than 100°C, the reactor is a double-layer tank reactor, and the target of the wet oxidation treatment is the easiest to oxidize Degraded organic pollutants; the temperature of the secondary oxidation is 100-200 ° C, the reactor is a double-layer tank reactor, and the target of wet oxidation treatment is organic pollutants that are difficult to be oxidized and degraded, and the source of heat of reaction is three The effluent of the first-stage oxidation and the effluent of the third-stage oxidation are heated for the second-stage oxidation and then the heat for the first-stage oxidation; the temperature of the third-stage oxidation is 200-250°C, and the reactor is a self-priming oxygenation reactor. The oxidized organic pollutants have been treated in the process of primary oxidation and secondary...

Embodiment 2

[0034] Taking the refractory chemical wastewater with a COD concentration of 100,000mg / L as an example, the treatment methods for other industrial wastewater are similar.

[0035] The high-concentration refractory chemical wastewater enters the primary oxidation reactor, and performs wet oxidation reaction at a temperature lower than 100°C. The reactor is a double-layer tank reactor, and oxygenated and aerated. The degraded organic pollutants are treated, and the inner and outer layers are subjected to wet oxidation treatment, and the respective COD removal rates are 5-10%; the temperature of the secondary oxidation is 100-200 ° C, and the reactor is a double-layer tank reactor , and carry out oxygenation and aeration. For the organic pollutants that are difficult to be oxidized and degraded, both the inner layer and the outer layer are subjected to wet oxidation treatment, and the respective COD removal rates are 5-15%; the temperature of the third-stage oxidation is 200-250 ...

Embodiment 3

[0038] A method for treating industrial wastewater by multi-stage wet oxidation, in which the industrial wastewater is subjected to primary oxidation, secondary oxidation and tertiary oxidation in sequence, the temperature of the primary oxidation is lower than the temperature of the secondary oxidation, and the temperature of the secondary oxidation is lower than the temperature of the tertiary oxidation temperature, and the tertiary oxidation supplies heat for the secondary oxidation and the primary oxidation in turn.

[0039] Wherein, the temperature of primary oxidation is less than 100°C, the temperature of secondary oxidation is 100-200°C, and the temperature of tertiary oxidation is 200-250°C. The primary oxidation is carried out in the primary oxidation reactor 1, the secondary oxidation is carried out in the secondary oxidation reactor 2, and the tertiary oxidation is carried out in the tertiary oxidation reactor 3.

[0040] The primary oxidation reactor 1 comprises a...

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Abstract

The invention relates to a method and a device for treating industrial wastewater by multi-stage wet oxidation. The method comprises the steps: industrial wastewater sequentially undergoes first-stageoxidation, second-stage oxidation and third-stage oxidation, the temperature of first-stage oxidation is lower than the temperature of second-stage oxidation, the temperature of second-stage oxidation is lower than the temperature of third-stage oxidation, and moreover, third-stage oxidation sequentially supplies heat to second-stage oxidation and first-stage oxidation. The device comprises an influent water storage tank communicating with a second reaction chamber of a first-stage oxidation reactor and an effluent water storage tank communicating with a first reaction chamber of the first-stage oxidation reactor. Compared with the prior art, the method and the device disclosed by the invention adopt the three stages of oxidation processes sequentially connected in series, consequently, organic pollutants in industrial wastewater can be treated step by step and stage by stage, the efficiency of industrial wastewater treatment is greatly increased, moreover, heat which is emitted in the process of reaction is sufficiently utilized, the high-efficiency operation of the whole system is maintained, energy consumption and industrial wastewater treatment cost are reduced, and the efficiency of treatment is increased.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and relates to a method and a device for multistage wet oxidation treatment of industrial wastewater. Background technique [0002] In recent years, with the rapid development of petrochemical, plastic, synthetic fiber, coking, printing and dyeing industries, the discharge of industrial wastewater is also increasing, such as dye wastewater, pesticide wastewater, petrochemical wastewater, coking wastewater, papermaking wastewater, etc. These industries Wastewater contains a large amount of organic pollutants that are difficult to biodegrade. These organic pollutants are decomposed by microorganisms very slowly, and organic pollutants that are not completely decomposed (including metabolites of organic pollutants) are easy to accumulate in organisms and become Potential sources of pollution of water bodies will cause serious pollution to the environment. Such organic pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/30
Inventor 曾旭王荣昌赵建夫程霞
Owner TONGJI UNIV
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