Method for treating sewage containing heavy metals

A heavy metal and sewage technology, applied in sludge treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of reducing COD value of sewage, unable to remove heavy metal elements and COD from sewage at the same time, and achieve low COD value and heavy metal Element content, the effect of improving the effect

Active Publication Date: 2021-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem that the prior art cannot simultaneously remove heavy metal elements and COD in sewage, and provide a method and application for treating heavy metal-containing sewage, which can realize synchronous removal of heavy metal elements in sewage, and Reduce the COD value of sewage, so that the content of heavy metal elements in the discharged water reaches the standard, and the COD value of the discharged water is reduced to below 400mg / L, which meets the quality requirements of the enterprise's subsequent biochemical treatment of influent water

Method used

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  • Method for treating sewage containing heavy metals
  • Method for treating sewage containing heavy metals
  • Method for treating sewage containing heavy metals

Examples

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preparation example

[0070] Starch-modified polymers were prepared according to the following method, and starch-modified polymers A1-A3 were prepared respectively.

[0071] Step a: In a four-necked flask equipped with a thermometer, a condenser tube, an agitator and a dropping funnel, add cornstarch and water, stir under nitrogen protection, and carry out reaction I;

[0072] Step b: Cool down to 50-65°C, add cerium ammonium nitrate nitric acid solution to carry out reaction II; then add acrylamide dropwise, carry out heat preservation reaction III, stop nitrogen;

[0073] Step c: cooling down to 30-50°C, in the presence of alkaline solution, adding carbon disulfide to carry out reaction IV;

[0074] Step d: The product is washed with ethanol several times, and dried at 60° C. to obtain the product.

[0075] Table 1

[0076]

[0077]

Embodiment 1

[0079] (1) Adjust the pH value of the sewage to 8.0 in the sewage regulating tank;

[0080] (2) Sewage flows into the reaction tank, L-cysteine ​​is added at 60 mg per L of sewage, starch-modified polymer A1 is added at 80 mg per L of sewage, and after stirring for 15 minutes, sulfuric acid is added at 2400 mg per L of sewage Iron, after stirring and reacting for 10 minutes, add cationic polyacrylamide with a cationic degree of 60% at 14 mg per L of sewage, and continue stirring and reacting for 8 minutes;

[0081] (3) The mixed solution flows into the sedimentation tank for solid-liquid separation, and the residence time is 15min. After the flocs are concentrated, they are press-filtered and landfilled.

[0082] (4) The effluent from the sedimentation tank enters the electrocatalytic oxidation reaction tank, in which the anode plate is Ti / PbO 2 -Dy, the cathode plate is graphite, the current density is 60mA / cm 2 , the time is 15min.

[0083] The heavy metal content and COD...

Embodiment 2

[0085] (1) Adjust the pH value of the sewage to 5.8 in the sewage regulating tank;

[0086] (2) Sewage flows into the reaction pool, L-cysteine ​​is added at 30 mg per L of sewage, starch-modified polymer A1 is added at 50 mg per L of sewage, and after stirring for 4 minutes, chlorine is added at 1000 mg per L of sewage Iron oxide, after stirring for 4 minutes, add cationic polyacrylamide with a cationic degree of 40% at 5 mg per L of sewage, and continue stirring for 4 minutes;

[0087] (3) The mixed solution flows into the sedimentation tank for solid-liquid separation. The residence time is 5 minutes. After the flocs are concentrated, they are press-filtered and landfilled.

[0088] (4) The effluent from the sedimentation tank enters the electrocatalytic oxidation reaction tank, in which the anode plate is Ti / IrO 2 -Tm, the cathode plate is titanium, the current density is 30mA / cm 2 , the time is 8min.

[0089] Analysis of the heavy metal content and COD value of the eff...

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Abstract

The invention relates to the field of sewage treatment, and discloses a method for treating sewage containing heavy metals. The method comprises the following steps of: step 1, adjusting the pH value of the sewage to 5.8-8.0; 2, adding L-cysteine, a starch modified high-molecular polymer, ferric salt and cationic polyacrylamide into a product obtained in the step 1, and carrying out a mixed reaction; 3, carrying out solid-liquid separation on the product obtained in the step 2 to obtain solid-phase floc and separated water, concentrating and filter-pressing the solid-phase floc, and returning the obtained concentrated supernatant liquid filter pressing effluent to the step 2; and 4, performing electrocatalytic oxidation treatment on the separated water to obtain discharged water. According to the method, the heavy metal elements in the sewage can be synchronously removed, and the COD value of the sewage is reduced, so that the content of the heavy metal elements in the discharged water reaches the standard, the COD value of the discharged water is reduced to 400 mg / L or below, and the water quality requirement of subsequent biochemical treatment of an enterprise is met.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for treating heavy metal-containing sewage. Background technique [0002] With the improvement of environmental protection requirements, the discharge of heavy metals and COD has been more strictly restricted. There are two difficulties in the treatment of heavy metal-containing high COD sewage, one is the removal of heavy metals, and the other is the removal of COD. The removal methods of heavy metals in sewage can be roughly divided into three categories, chemical treatment (chemical precipitation, electrolysis and redox method, etc.), physical treatment (adsorption, ion exchange and membrane separation, etc.) and biological treatment ( Biosorption, bioflocculation and phytoremediation, etc.); the treatment methods of high COD sewage can be roughly divided into three categories, physical treatment (adsorption, centrifugal separation, sedimentation or sediment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F11/121C02F11/122C02F101/20
CPCC02F9/00C02F11/121C02F11/122C02F2101/20C02F1/56C02F1/54C02F1/62C02F1/725C02F1/4672C02F1/66C02F2301/08
Inventor 郦和生谢文州秦会敏楼琼慧王洪英任志峰胡永丰
Owner CHINA PETROLEUM & CHEM CORP
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