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Treatment method of emulsion wastewater

A treatment method and emulsion technology, which are applied in water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of excessive decrease in membrane flux, easy membrane pollution, and low mechanical strength, etc. Achieve the effect of avoiding secondary pollution, improving removal efficiency, and improving biodegradability

Active Publication Date: 2020-12-15
TAIYUAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

Ultrafiltration uses many organic membranes, but the cost of organic membranes is too high, and they are not resistant to high temperatures, have low mechanical strength, and are easy to hydrolyze, etc.
At the same time, ultrafiltration membranes have problems such as rapid decrease in membrane flux and easy fouling of membranes.
It needs to be cleaned regularly, and it will cause additional economic expenditure

Method used

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  • Treatment method of emulsion wastewater
  • Treatment method of emulsion wastewater
  • Treatment method of emulsion wastewater

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0043] Experimental example 1: Comparative experiment of potassium ferrate compound coagulant

[0044] A. Potassium ferrate compound PAC: Use 1mol / L sulfuric acid and sodium hydroxide solution to adjust the initial pH=7, set the temperature to 30°C, and add PAC to the wastewater under the condition that the dosage of PAC is 50mg / L Potassium ferrate (1% solution) is used as coagulant aid, so that the content of potassium ferrate in the water sample is 0, 20, 30, 50, 100 mg / L respectively.

[0045] The effect of the dosage of potassium ferrate on the removal of pollutants is as follows: figure 1 shown. From figure 1 It was found that as the dosage of potassium ferrate increased from 0 to 50mg / L, the removal rate of CODCr and turbidity of the solution increased rapidly from 48.6%, 62.1% to 84.8%, 92.07%, respectively. Table 1 shows the effect on the removal efficiency of emulsion wastewater when only PAC is added, and Table 2 shows the effect on the removal efficiency of emuls...

experiment example 2

[0066] Experimental example 2: Single factor experiment in the coagulation and sedimentation stage: add 100mL emulsion wastewater into the beaker, and use 1mol / L H 2 SO 4 and NaOH solution to adjust the pH. Add the specified amount of coagulant PAC (10% solution) and coagulant aid potassium ferrate (1% solution) successively, and carry out magnetic stirring at a fixed speed at a set temperature. Stir the reaction for 10 minutes, let it settle for 30 minutes, take the supernatant to measure COD Cr and turbidity values. The factors investigated include: initial pH (3, 5, 7, 9, 11), PAC dosage (0, 10, 20, 30, 50, 100 mg / L), potassium ferrate dosage (0, 20, 30, 50, 100mg / L), reaction temperature (20, 30, 40, 50, 60°C), settling time.

[0067] The effect of initial pH on the removal of pollutants by coagulation and sedimentation is as follows: Figure 5 shown by Figure 5 The experimental results determined that in subsequent experiments, the initial pH value was selected as ...

experiment example 3

[0080] Experimental example 3: Electrochemical oxidation stage experiment: inject 500mL of wastewater treated under the optimal conditions in the coagulation and sedimentation process section into a beaker with an effective volume of 500mL, and add 500mg / L Na 2 SO 4 electrolyte to increase the conductivity of the solution. Place the BDD anode and Ti cathode vertically in the beaker, the distance between the plates is 10mm, and the immersion area is 10cm 2 , applying a set current density for galvanostatic electrochemical degradation. During the reaction, the beaker was placed on a constant temperature magnetic stirrer to make the concentration of the reaction solution uniform and the temperature constant; samples were taken regularly to determine the concentration values ​​of CODCr, ammonia nitrogen (NH3-N) and total organic carbon (TOC). The factors investigated include: current density (20, 30, 50, 75, 100mA / cm2), initial pH of the electrolysis process section (3, 5, 7, 9,...

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Abstract

The invention belongs to the technical field of wastewater treatment, and provides a treatment method of emulsion wastewater. The method includes: assisting coagulating sedimentation with potassium ferrate, combining an electrochemical oxidation method for jointly treating the emulsion wastewater, adopting PAC as a coagulant, using potassium ferrate as a coagulant aid, controlling the reaction temperature at 35-40DEG C, conducting coagulating sedimentation pretreatment on the emulsion wastewater for 10min, and performing standing for 30-40min; and after the emulsion wastewater coagulating sedimentation pretreatment is completed, connecting a BDD electrode electrochemical oxidation process, and carrying out advanced treatment on the effluent of the coagulating sedimentation process. Potassium ferrate is used as the coagulant aid, so that the removal effect of the coagulant on organic pollutants can be improved, and the product of potassium ferrate after hydrolysis does not cause harm toa human body and does not cause secondary pollution. And the biodegradability of effluent is improved. The electrochemical method can efficiently degrade pollutants in the wastewater, does not generate harmful substances, and does not cause secondary pollution. Compared with a membrane treatment method, the method is easy to construct and does not need cleaning.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a treatment method for emulsion wastewater. Background technique [0002] At present, the key to the treatment of emulsion wastewater is effective demulsification, that is, oil-water separation. The existing process mainly relies on coagulation and sedimentation to add flocculants to enhance the effects of neutralization, adsorption and bridging in the solution, so that the colloidal particles in the solution are destabilized and coalesced to form large-grained flocs. Coagulation aids are used to further enhance the size and density of flocculation; after the coagulation and sedimentation process, biological methods or membrane filtration methods are used to conduct advanced treatment of the effluent from the coagulation process section. So that the effluent reaches the standard before being discharged. [0003] In order to solve the serious problem of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
CPCC02F9/00C02F1/5236C02F1/4672C02F1/66
Inventor 张峰崔建国武世煊李红艳崔佳丽王朝旭
Owner TAIYUAN UNIV OF TECH
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