Pretreatment method of epoxy type plasticizer production wastewater

A technology for producing wastewater and plasticizers, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. effect with alkali

Active Publication Date: 2013-02-20
浙江嘉澳环保科技股份有限公司
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Problems solved by technology

However, when it is applied to this type of wastewater, the water is turbid, and the grease cannot be removed.

Method used

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  • Pretreatment method of epoxy type plasticizer production wastewater

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Embodiment 1

[0019] Such as figure 1 Shown, the concrete steps of the pretreatment method of epoxy plasticizer production waste water are:

[0020] (1) Inject wastewater from the production of epoxy plasticizers (grease content about 500ppm, hydrogen peroxide concentration 0.8%, pH value 4) into the grease trap, add 30% hydrochloric acid to adjust the pH to 3 for acidification and demulsification, after adjustment , Put the waste water into the regulating tank, turn on the fan to aerate the micropores to remove oil, the time of micropore aeration is 3 hours, then turn on the automatic oil scraper to skim the grease, after the oil is completely scraped, add an appropriate amount of sodium carbonate Adjust the pH value of the wastewater to 5 and enter the next step;

[0021] (2) Pump the waste water into the advection air flotation device. Turn on the air flotation device for air flotation treatment. The specific operating conditions of the air flotation treatment are: the pressure of the ...

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Abstract

The invention provides a pretreatment method of epoxy type plasticizer production wastewater. The pretreatment method is characterized by comprising the following specific steps: step one, conducting acidification and demulsification on the epoxy type plasticizer production wastewater, conducting microporous aeration and oil removal firstly, removing oil by utilizing a full-automatic oil scraper, and adjusting the pH value of wastewater to be 4.5-5.5; and step two, pumping the wastewater treated by the step one into an air floatation device for air floatation treatment, wherein the chemical adding sequence in the operation of the air floatation device is as follows: adding polymeric aluminum firstly, then adding alkali liquor to adjust the pH value to be 7.5-8.5, and finally adding anionic polyacrylamide, and water discharged from the air floatation device is filtered by quartz sand; and step three, filling the wastewater treated in the step two to be full of a natural manganese sand filter tank by a mode of feeding from the lower part and the discharging from the upper part so as to remove residual hydrogen peroxide in the wastewater to obtain the pre-treated epoxy type plasticizer production wastewater. The pretreatment method has the advantages that the oil can be removed thoroughly, floatation slag generated by air floatation is obvious, the volume of the floatation slag is small after the floatation slag is discharged into a sludge drying bed to be concentrated, the treatment is easy and the like.

Description

technical field [0001] The invention relates to a pretreatment method for wastewater produced by epoxy plasticizers. Background technique [0002] Epoxy plasticizer production wastewater contains pollutants such as formic acid, hydrogen peroxide, and oil, which are difficult to treat with conventional methods. As a pretreatment before biochemical treatment, the most critical thing is to remove the residual oil and hydrogen peroxide in the wastewater, and neutralize the wastewater to neutrality. [0003] At present, the general treatment method for this kind of organic wastewater in China is: oil separation (including demulsification)->Fenton oxidation->neutralization->press filtration (or press filtration as sludge after sedimentation). The principle of this method is to use the residual hydrogen peroxide in the wastewater to oxidize the wastewater. Although it has achieved a good treatment effect, it also has many disadvantages: [0004] <1> The oil removal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08
Inventor 沈健冯均军
Owner 浙江嘉澳环保科技股份有限公司
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