Method for treating industrial wastewater through subcritical water oxidation process in combination with biochemical process

A subcritical water and industrial wastewater technology, applied in the direction of oxidation water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problem of severe acid corrosion of equipment, and achieve corrosion reduction, huge social and economic benefits Efficiency, ease of large-scale promotion and application

Inactive Publication Date: 2014-04-16
戴均和
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Problems solved by technology

[0005] In view of the imminent problem of severe acid corrosion of equipment in the existing wastewater treatment technology, the purpose of the present invention is to provide a method for treating industrial wastewater by subcritical water oxidation combined with biochemical methods

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  • Method for treating industrial wastewater through subcritical water oxidation process in combination with biochemical process

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Embodiment 1

[0024] Present embodiment industrial wastewater treatment process is as follows:

[0025] (1) Subcritical water oxidation pretreatment:

[0026] The industrial wastewater is pumped out from the wastewater storage tank 1, filtered and pressurized by the booster pump 2, then preheated by the heat exchanger 3, flows into the mixer 4 and mixed with the oxygen provided by the air compressor 6, and enters the titanium stainless steel reactor 5 to generate In the subcritical water oxidation reaction, the pressure in the reactor 5 is controlled to 5 MPa and the temperature is 240°C through the heater 8 to degrade the toxic organic substances in the wastewater; the reacted fluid is exchanged by the heat exchanger 3 for preheating The waste water transported into the heat exchanger 5 is cooled by the cooler 9, and the pressure is lowered to 0 MPa, and then enters the gas-liquid separator 7, and the obtained liquid-phase water and gas-phase gas products are discharged from the bottom and...

Embodiment 2

[0029] (1) Subcritical water oxidation pretreatment:

[0030] The industrial wastewater is pumped out from the wastewater storage tank 1, filtered and pressurized by the booster pump 2, then preheated by the heat exchanger 3, flows into the mixer 4 and mixed with the oxygen provided by the air compressor 6, and enters the titanium stainless steel reactor 5 to generate In the subcritical water oxidation reaction, the pressure in the reactor 5 is controlled by the heater 8 to 8 MPa and the temperature is 180°C to degrade the toxic organic matter in the wastewater; the reacted fluid is exchanged by the heat exchanger 3 for preheating The waste water transported into the heat exchanger 5 is cooled by the cooler 9, and the pressure is lowered to 0 MPa, and then enters the gas-liquid separator 7, and the obtained liquid-phase water and gas-phase gas products are discharged from the bottom and top of the separator respectively; Inorganic salts in the critical water oxidation state ar...

Embodiment 3

[0033] (1) Subcritical water oxidation pretreatment:

[0034] The industrial wastewater is pumped out from the wastewater storage tank 1, filtered and pressurized by the booster pump 2, then preheated by the heat exchanger 3, flows into the mixer 4 and mixed with the oxygen provided by the air compressor 6, and enters the titanium stainless steel reactor 5 to generate In the subcritical water oxidation reaction, the pressure in the reactor 5 is controlled to 12MPa and the temperature is 150°C through the heater 8 to degrade the toxic organic substances in the wastewater; the reacted fluid is exchanged by the heat exchanger 3 for preheating The waste water transported into the heat exchanger 5 is cooled by the cooler 9, and the pressure is lowered to 0 MPa, and then enters the gas-liquid separator 7, and the obtained liquid-phase water and gas-phase gas products are discharged from the bottom and top of the separator respectively; Inorganic salts in the critical water oxidation...

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Abstract

The invention discloses a method for treating industrial wastewater through a subcritical water oxidation process in combination with a biochemical process. The method provided by the invention comprises the following processes of (1) subcritical water oxidation process-based pretreatment: strictly controlling the pressure range of the subcritical water oxidation reaction in a reactor within the range from 5 to 12MPa, the temperature within the range from 150 to 240 DEG C, and degrading toxic organic matters in the wastewater; and (2) biochemical process-based after-treatment: performing biochemical process-based treatment on the liquid phase water obtained in the step (1) in biochemical treatment equipment, thus obtaining the industrial wastewater which is up to the emission standards. According to the invention, as the reaction temperature and the reaction pressure are reduced to the specific ranges, the degree of acidic corrosion can be greatly reduced, and toxic organic matters in the wastewater can be effectively removed; as a result, the toxicity of the wastewater is eliminated and certain biochemical activity of the wastewater is maintained; in combination with subsequent biochemical treatment, complete up-to-standard emission of the wastewater can be realized.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a method for treating high-concentration refractory industrial organic wastewater with a subcritical water oxidation method combined with a biochemical method. Background technique [0002] A large part of industrial wastewater is high-concentration refractory and refractory wastewater, which must be treated separately from other low-concentration wastewater such as cleaning wastewater and domestic wastewater. The biochemical treatment technology using microorganisms has been widely used in the field of wastewater treatment, mainly including activated sludge method, biological contact oxidation method, biological turntable method, tower biofilter treatment method, etc., but due to the toxicity in wastewater (mainly Toxic organics) are often not effectively removed in the pre-treatment technology, which affects the biochemical activity, and can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/72
Inventor 戴均和
Owner 戴均和
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