Wastewater treatment method for removing heavy metals and reducing COD

A technology for heavy metals and waste water, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of difficulty in removing heavy metal COD well

Pending Publication Date: 2021-04-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defect that the prior art is difficult to remove heavy metals and reduce COD well, and provide a wastewater treatment method for removing heavy metals and reducing COD

Method used

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  • Wastewater treatment method for removing heavy metals and reducing COD
  • Wastewater treatment method for removing heavy metals and reducing COD

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) discharge the waste water into the regulating tank, and adjust the pH value of the waste water to 8.8;

[0041](2) After the treatment in step (1), the wastewater flows into the reaction pool, and 2000 mg of polysilicate ferric sulfate is added per L of wastewater. After stirring for 12 minutes, 13 mg of cationic polyacrylamide with a cationic degree of 60% is added per L of wastewater. , continue to stir and react for 7min;

[0042] (3) After the step (2) is processed, the mixed solution flows into the sedimentation tank for sedimentation and separation. The residence time is 12min. 60% of the floc precipitation in the lower floor obtained by the sedimentation separation is returned to the reaction tank, and the remaining flocs are concentrated and filtered. Buried, the floc concentrated supernatant and press-filtered water are returned to the reaction tank;

[0043] (4) The effluent of the sedimentation tank (that is, the supernatant liquid separated by sedimenta...

Embodiment 2

[0046] (1) discharge the waste water into the regulating tank, and adjust the pH value of the waste water to 8.6;

[0047] (2) After the treatment in step (1), the waste water flows into the reaction pool. Add polyferric sulfate at 1650 mg per L of waste water. After stirring for 9 minutes, add cationic polyacrylamide with a cationic degree of 50% at 11 mg per L of waste water. Continue Stir the reaction for 6 minutes;

[0048] (3) After the step (2) is processed, the mixed solution flows into the settling tank for sedimentation and separation, the residence time is 10min, and 50% of the floc precipitation of the lower floor obtained by the sedimentation separation is returned to the reaction tank, and the remaining floc precipitation is concentrated and press-filtered, Landfill, concentrated supernatant and press filtered water back to the reaction tank;

[0049] (4) The effluent of the sedimentation tank (that is, the supernatant liquid separated by sedimentation) enters th...

Embodiment 3

[0052] (1) discharge the waste water into the regulating tank, and adjust the pH value of the waste water to 8.3;

[0053] (2) After the step (1) is processed, the waste water flows into the reaction pool, and polyferric chloride is added at 1250 mg per L of waste water, and after stirring for 6 minutes, 9 mg per L of waste water is added with cationic polyacrylamide having a cationic degree of 50%. Continue to stir and react for 5min;

[0054] (3) after the step (2) is processed, the mixed solution flows into the settling tank for sedimentation and separation, the residence time is 8min, and 40% of the floc precipitation of the lower floor obtained by the sedimentation separation is returned to the reaction tank, and the remaining floc precipitation is concentrated and press-filtered, Landfill, concentrated supernatant and press filtered water back to the reaction tank;

[0055] (4) The effluent of the sedimentation tank (that is, the supernatant liquid separated by sediment...

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Abstract

The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment method for removing heavy metals and reducing COD. The method comprises the following steps: (1) adjusting the pH value of the wastewater to 8.1-9.1; (2) carrying out a first stirring reaction on the wastewater obtained in the step (1) and an iron salt, and then carrying out a second stirring reaction on the obtained material and cationic polyacrylamide; (3) carrying out settling separation on the material obtained by the second stirring reaction to obtain a floc precipitate and a supernatant; and (4) carrying out heterogeneous Fenton treatment on the supernatant obtained in the step (3) and H2O2. The method provided by the invention can synchronously realize up-to-standard discharge of heavy metals and effectively reduce the COD value, and fully meets the inflow water quality requirements of subsequent biochemical treatment.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment method for removing heavy metals and reducing COD. Background technique [0002] There are two difficulties in the treatment of high COD wastewater containing heavy metals, one is the removal of COD, and the other is the removal of heavy metals. For the treatment of high COD wastewater, coagulation sedimentation method, advanced oxidation method, adsorption method, electrochemical method, etc. are all applied. The coagulation-sedimentation method mainly removes suspended solids and refractory macromolecular organic matter by adding coagulants and flocculants. The disadvantage is that the removal effect is limited; the advanced oxidation method (ozone, Fenton reagent, etc.) Degradation of organic matter is more and more widely used in the treatment of refractory organic wastewater. The disadvantages are that the utilization rate of ozone is low...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/20
Inventor 郦和生谢文州楼琼慧秦会敏张春原王洪英
Owner CHINA PETROLEUM & CHEM CORP
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