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Method and device for treating salt-containing wastewater produced during producing epoxy chloropropane by using glycerol as raw material

A technology of epichlorohydrin and salty wastewater, which is applied in the direction of oxidized water/sewage treatment, natural water treatment, water/sewage multi-stage treatment, etc., can solve the problems of difficult wastewater treatment, high treatment cost, and high treatment cost, and achieve Effective recycling and utilization, simple treatment process and reasonable structure

Active Publication Date: 2011-08-17
SHANGHAI CHEM IND PARK SINO FRENCH WATERDEV
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  • Summary
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  • Description
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AI Technical Summary

Problems solved by technology

Chinese patent CN1004695B discloses "a method for recovering glycerol from saline waste water", and its steps mainly include: evaporation, contact with amyl alcohol, separation and precipitation of salt, flash evaporation to remove amyl alcohol, and vacuum rectification. This process is more suitable for Treat the saline wastewater produced by the production of epichlorohydrin resin, and at the same time obtain refined glycerin and solid sodium chloride, but this method has complex processes, high energy consumption, and relatively high treatment costs
However, its main disadvantage is that the cultivation of aerobic granular sludge is very difficult
Chinese patent CN 101723539A discloses "a treatment method for saline wastewater", which uses a biological aerated filter as the main device for treatment, and has the characteristics of good salt tolerance and strong impact load resistance. However, due to biological aerated The treatment load of the filter is not high, and special suspension carriers and engineering bacteria are required. Therefore, it is difficult to treat wastewater with a high load of organic pollutants, and the treatment cost is high
In addition, the treatment methods of the above two patents are difficult to treat wastewater with a salt concentration exceeding 30g / L

Method used

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  • Method and device for treating salt-containing wastewater produced during producing epoxy chloropropane by using glycerol as raw material
  • Method and device for treating salt-containing wastewater produced during producing epoxy chloropropane by using glycerol as raw material
  • Method and device for treating salt-containing wastewater produced during producing epoxy chloropropane by using glycerol as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The mobile bed membrane bioreactor small-scale test device is used to treat the saline wastewater produced from glycerol as raw material for epichlorohydrin. The content of glycerol in the wastewater is 2500 mg / L, and the content of NaCl is 208000 mg / L; The effluent is mixed with the waste water at a ratio of 6-8:1. The COD of the effluent from the sewage treatment plant is 70-90 mg / L, the chloride ion concentration is 3000-5000 mg / L, and the COD of the mixed waste water is 500-700 mg / L. , the chloride ion concentration is about 20000-25000mg / L;

[0060] The moving bed membrane bioreactor small test device has an effective volume of 7.5L, and contains 60 PVC material columnar porous fillers with a diameter of 4cm and a height of 4cm. The filled fillers account for 50% of the effective volume of the reactor, and the reactor is equipped with 2 PVDF plates Type microfiltration membrane, the membrane pore size is 0.1-1 micron, and the effective area of ​​the membrane is 0.0...

Embodiment 2

[0062] A membrane bioreactor with an effective volume of 400L is used to treat saline wastewater produced from epichlorohydrin using glycerol as a raw material. The pretreatment method is the same as in Example 1. The COD of the wastewater after mixing is 600-700mg / L, and the chloride ion concentration is about 17000~20000mg / L;

[0063]The reactor is equipped with a plate-type membrane module, the membrane material is the same as that of Example 1, and the effective area of ​​the membrane is 1.3m 2 , the sludge concentration is 5000-6000mg / L, and the organic pollution load is 0.1 kgCOD / (kgMLSS day); after 60 days of stable operation, the COD of the reactor effluent can be controlled at 80-130 mg / L, see Image 6 The monitoring results of effluent COD and chloride ion concentration are shown in the figure.

Embodiment 3

[0065] The effluent treated in Example 2 was subjected to advanced treatment using the ozone oxidation step, and the ozonation reactor used in the experiment was a glass scrubber with an inner diameter of 10 cm, a height of 55 cm, and an effective volume of 4 liters. The mixed gas of oxygen and ozone generated by the ozone generator is continuously fed into the ozonation reactor, the air flow rate is 1L / min, and the ozone concentration is 60mg / L. After 20 minutes of ozonation reaction, the COD of the wastewater is changed from the initial 130mg / L was reduced to 90 mg / L, and the removal rate of total organic carbon could reach 45% after 60 minutes. The water quality treated by the ozone oxidation step meets the requirements of the secondary discharge standard of "Shanghai Municipal Standard Sewage Comprehensive Discharge Standard DB31 / 199-2009".

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Abstract

The invention relates to the technical field of industrial wastewater treatment, in particular to a method and a device for treating salt-containing wastewater produced during producing epoxy chloropropane by using glycerol as a raw material. The treatment method comprises the following steps of: (1) mixing the salt-containing wastewater and other wastewater with low pollution, adding nitrogen and phosphorus nutrients, and discharging the mixed wastewater after the salt content of the wastewater is less than 5 percent; (2) introducing the wastewater treated in the step (1) into a moving bed film biological reactor, and further treating the wastewater by using active sludge; and (3) introducing the wastewater treated in the step (2) into an ozone reaction unit to perform ozone oxidation treatment, and then discharging the treated wastewater. The invention also provides the wastewater treatment device adopted by the method. The device mainly comprises a regulating tank, the moving bed film biological reactor and the ozone reaction unit. The treatment process is simple, the operation is stable, the cost is low, the water quality of the discharged water can be ensured, and the method and the device are suitable for treating the organic wastewater with high salt content and high chemical oxygen demand (COD).

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, and relates to the treatment of industrial saline wastewater, in particular to a treatment method and device for saline wastewater produced from epichlorohydrin using glycerin and sodium chloride as raw materials. Background technique [0002] Epichlorohydrin is an important organic chemical raw material and fine chemical product, which is widely used in industries such as coatings, adhesives, reinforcing materials, casting materials and electronic laminates. The traditional production methods of epichlorohydrin include the high-temperature chlorination of propylene based on petroleum raw materials and the propylene acetate method. In recent years, due to the soaring price of petroleum, the price of epichlorohydrin produced by the above process remains high. In this case, people have developed a new process for producing epichlorohydrin using glycerin, which is a by-produ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/36C02F1/78
Inventor 瞿贤王乔刘琴康健灵
Owner SHANGHAI CHEM IND PARK SINO FRENCH WATERDEV
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