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Method and device for treating high-salt refractory organic wastewater

A technology of organic wastewater and treatment methods, applied in water/sewage treatment, multi-stage water/sewage treatment, heating water/sewage treatment, etc., can solve the problems of long process flow, high operating costs, high equipment investment, etc., and achieve high The effect of catalytic degradation efficiency, efficiency improvement and energy consumption reduction

Pending Publication Date: 2017-03-15
HUNAN PINGAN ENVIRONMENT PROTECTION
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Problems solved by technology

[0007] At present, a combination of multiple traditional processes is mainly used for high-salinity, high-concentration and refractory organic wastewater. The process is too long, the equipment investment is high, and the operating cost is high.

Method used

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  • Method and device for treating high-salt refractory organic wastewater

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Embodiment 1

[0034] A certain saccharin sodium production waste water——Adopt the method of the present invention and the corresponding pilot plant to pretreat the iron replacement liquid that replaces the cupric acid water.

[0035] The replacement cupric acid water is first replaced by iron to recover the copper element, adjust the pH to 8.5~9, and precipitate. The COD of the supernatant is 14200~15680 mg / L, COD 2690~3120 mg / L, NaCl~8%, NaCl 2 SO 4 ~3%.

[0036] Subsequent processing of the supernatant includes the following steps:

[0037] (1) Cupric acid hydroferric replacement liquid, the precipitated supernatant liquid is preheated by the gas-liquid heat exchanger 1 and the liquid-liquid heat exchanger 2, pressurized by the booster pump 3 and the compressor fan 4, and then oxidized in WAO Catalytic oxidation reaction occurs in reactor 6, the pressure of WAO oxidation reactor is 3.2~4.1 MPa, and the temperature is 181.2~186.3°C;

[0038] (2) After the mixed liquid after the oxidatio...

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Abstract

The invention discloses a method and a device for treating high-salt refractory organic wastewater, and particularly relates to a method and a device for treating high-concentration refractory COD and high-salt industrial wastewater by coupling the catalytic wet oxidation and MVR evaporation and concentration crystallization technology. The device comprises a vapor-liquid heat exchanger, a liquid-liquid exchanger, a booster pump (or a circulating pump), a compression fan, an oxidant dosing device, a wet catalytic oxidation reactor (WAO), an evaporator, a vapor compressor and a vapor-water separator. Raw water is subjected to air catalytic wet oxidation in the WAO reactor after two-stage preheating through the vapor-liquid heat exchanger and the liquid-liquid exchanger; the oxidized wastewater is evaporated and concentrated by an evaporator to obtain crystalline salt and the distilled water. The method and the device provided by the invention combine advantages of a wet oxidation technology and an MVR technology, effectively degrade organic matters, improve biodegradability of wastewater, and realize effective utilization of heat energy generated by WAO oxidation reaction and secondary vapor of the evaporator.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and relates to high salinity and refractory organic waste water, in particular to waste water treatment of high salinity and high concentration refractory organic matter. Background technique [0002] High-salinity, high-concentration refractory organic wastewater is a type of production wastewater produced by printing and dyeing, landfill leachate, papermaking and fine chemical industries. The COD content in wastewater is as high as 10000-50000 mg / L, which contains benzene, toluene, benzoic acid, phenol and other benzene series and other refractory organic substances; the salt content in wastewater is as high as 10%-15%. This kind of wastewater has poor biodegradability and is difficult to remove through biochemical treatment; nor can it achieve the standard discharge of TDS through membrane treatment technology. If it is discharged directly, it will not only seriously pollute the environme...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/30
CPCC02F1/06C02F1/725C02F2101/30
Inventor 廖求文彭关中周曙光
Owner HUNAN PINGAN ENVIRONMENT PROTECTION
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