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Method for treating high-COD wastewater containing heavy metals

A technology for wastewater treatment and heavy metals, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc.

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

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for the treatment of heavy metal-containing high COD wastewater in order to overcome the defects that the prior art is difficult to remove heavy metals and reduce COD

Method used

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  • Method for treating high-COD wastewater containing heavy metals
  • Method for treating high-COD wastewater containing heavy metals

Examples

Experimental program
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Effect test

Embodiment 1

[0048] (1) discharge the waste water into the regulating tank, and adjust the pH value of the waste water to 7.2;

[0049] (2) After the step (1) is processed, the waste water flows into the reaction pool. The butanediamine polyamide amine blocked by sodium dithiocarboxylate is 50 mg per L of waste water, and 30 mg per L of waste water for sodium dimethyl dithiocarbamate. Add and stir for 8 minutes, then add iron polysilicate at 1000 mg per L of wastewater and stir for 4 minutes, then add cationic polyacrylamide with a cationic degree of 40% at 7 mg per L of wastewater, and continue stirring for 4 minutes;

[0050] (3) After the step (2) is processed, the mixed solution flows into the sedimentation tank for sedimentation and separation. The residence time is 6min. 35% 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 then filtered. Buried, the floc concentrated su...

Embodiment 2

[0054] (1) discharge the waste water into the regulating tank, and adjust the pH value of the waste water to 7.8;

[0055] (2) After the step (1) is processed, the waste water flows into the reaction pool. The ethylenediamine polyamide amine end-capped by ammonium dithiocarboxylate is charged at 70 mg per L of waste water, and dimethyl dithiocarbamate is used at the rate of per L of waste water. Add 50 mg and stir for 16 minutes, then add polyferric sulfate (Qinyang Lebang Water Treatment Material Co., Ltd., Lebang Polymerized Ferric Sulfate SPFS) at 1500 mg per L of wastewater and stir for 8 minutes, then add 9 mg per L of wastewater Cationic polyacrylamide with a cationic degree of 50%, continue to stir and react for 7 minutes;

[0056] (3) After the step (2) is processed, the mixed solution flows into the sedimentation tank for sedimentation and separation. The residence time is 9min. 50% of the floc precipitation in the lower layer obtained by the sedimentation separation ...

Embodiment 3

[0060] (1) discharge the waste water into the regulating tank, and adjust the pH value of the waste water to 7.5;

[0061] (2) After the step (1) is processed, the waste water flows into the reaction pool. The hexamethylenediamine core polyamide amine blocked by potassium dithiocarboxylate is 60 mg per L of waste water, and potassium dimethyl dithiocarbamate is used per L of waste water. Add 40 mg and stir for 12 minutes, then add polysilicate ferric sulfate at 1200 mg per L of wastewater and stir for 6 minutes, then add cationic polyacrylamide with a cationic degree of 50% at 8 mg per L of wastewater, and continue stirring for 6 minutes;

[0062] (3) after the step (2) is processed, the mixed solution flows into the sedimentation tank for sedimentation and separation, and the residence time is 7min. 45% 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 then filter...

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Abstract

The invention relates to the technical field of wastewater treatment, in particular to a method for treating high-COD wastewater containing heavy metals. The invention relates to a method for treating high-COD wastewater containing heavy metals. The method comprises the following steps: (1) adjusting the pH value of the wastewater to 6.9-8.1; (2) carrying out stirring reaction on the wastewater obtained in the step (1), a dithiocarboxylic acid-terminated polyamidoamine dendritic polymer, dimethyl dithiocarbamate, ferric salt and cationic polyacrylamide; (3) carrying out settling separation on the material obtained in the step (2) to obtain floc precipitate and supernatant; and (4) carrying out ultrasonic treatment and ozone treatment on the supernatant obtained in the step (3). 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 method for treating heavy metal-containing high-COD wastewater. Background technique [0002] With the improvement of environmental protection requirements, the discharge of COD and heavy metals is subject to stricter restrictions. According to GB 31571-2015 and GB 31570-2015, the emission limit of COD is 60mg / L. For areas where the environmental carrying capacity begins to weaken, a special emission limit of 50mg / L should be implemented, while the emission requirements for heavy metals are More stringent, the monitoring point is advanced to the waste water outlet of the workshop or production facility, and the specific discharge limits of total lead, total arsenic, total cadmium, total nickel, total mercury, and total chromium are limited. [0003] There are two difficulties in the treatment of heavy metal-containing high COD wastewater, one is the removal of hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/20
Inventor 谢文州郦和生秦会敏楼琼慧王洪英张春原
Owner CHINA PETROLEUM & CHEM CORP
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