Treatment method and application of high-COD high-phosphorus heavy metal-containing sewage

A treatment method and heavy metal technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, sludge treatment, etc., can solve the problem that heavy metals, COD and phosphorus cannot be removed simultaneously in sewage

Inactive 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

[0009] The purpose of the present invention is to overcome the problem that the prior art cannot remove heavy metals, COD and phosphorus in sewage at the same time, and provide a treatment method for sewage with high COD and high phosphorus containing heavy metals, which can realize synchronous removal of Heavy metals, phosphorus and COD, so that the heavy metals, phosphorus content and COD of the discharged water meet the standards

Method used

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  • Treatment method and application of high-COD high-phosphorus heavy metal-containing sewage
  • Treatment method and application of high-COD high-phosphorus heavy metal-containing sewage

Examples

Experimental program
Comparison scheme
Effect test

preparation example

[0068] The zeolite-modified cationic polyacrylamide used in the examples and comparative examples was prepared according to the following method.

[0069] (1) Zeolite pretreatment: Put 1 g of zeolite with particles of -60 mesh to +100 mesh into a beaker, add 100 mL of 1% HCl, stir for 3 hours, filter, and wash with deionized water until the filtrate is neutral, and the solid is stored at 60 °C Dry for 6 hours;

[0070] (2) Dissolution of cationic polyacrylamide: add 1 g of cationic polyacrylamide to 1 L of deionized water, stir at 800 rpm for 3 h;

[0071] (3) Zeolite-modified cationic polyacrylamide: Add 0.2 g of zeolite treated in (1) to (2), stir and react at 60°C for 4 hours, then continue to react in an oven at 60°C for 6 hours to obtain zeolite-modified polyacrylamide. Acrylamide.

[0072] Among them, the types of zeolite and the cationic degree of cationic polyacrylamide are shown in Table 1.

[0073] Table 1

[0074] Zeolite modified cationic polyacrylamid...

Embodiment 1

[0076] (1) Adjust the pH value of the sewage to 7.6 in the sewage regulating tank;

[0077] (2) Sewage flows into the reaction tank, add ferric chloride 2500mg / L, stir and react for 10 minutes, add mordenite modified cationic polyacrylamide A1 8mg / L, continue stirring and reacting for 6 minutes;

[0078] (3) The mixed solution flows into the sedimentation tank for solid-liquid separation, the residence time is 10min, 60% of the flocs are returned to the reaction tank, the remaining flocs are concentrated, press-filtered, landfilled, the supernatant of the concentrated flocs and the press-filtered water return to the reaction pool;

[0079] (4) The effluent from the sedimentation tank enters the organic titanium adsorption reaction tank, the dosage of organic titanium adsorbent is 5‰, and the reaction time is 30 minutes. The heavy metal contents and COD values ​​in the discharged water are shown in Table 2.

Embodiment 2

[0081] (1) Adjust the pH value of the sewage to 5.6 in the sewage regulating tank;

[0082] (2) Sewage flows into the reaction tank, add iron sulfate 1500mg / L, stir and react for 2 minutes, add stilbite-modified cationic polyacrylamide A2 4mg / L, continue to stir and react for 3 minutes;

[0083] (3) The mixed solution flows into the sedimentation tank for solid-liquid separation, the residence time is 5min, 25% of the flocs are returned to the reaction tank, the remaining flocs are concentrated, press-filtered, landfilled, the supernatant of the concentrated flocs and the press-filtered water return to the reaction pool;

[0084] (4) The effluent from the sedimentation tank enters the organic titanium adsorption reaction tank, the dosage of organic titanium adsorbent is 2‰, and the reaction time is 10 minutes. The heavy metal contents and COD values ​​in the discharged water are shown in Table 2.

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Abstract

The invention relates to the field of sewage treatment, and discloses a treatment method of high-COD high-phosphorus heavy metal-containing sewage, which comprises the following steps: 1, regulating the pH value of the sewage to 5.6-7.6; step 2, adding ferric salt into the sewage obtained in the step 1 to carry out a first mixing reaction, and then adding zeolite modified cationic polyacrylamide to carry out a second mixing reaction; 3, carrying out solid-liquid separation on the mixed solution obtained in the step 2 to obtain solid-phase floc and separated water; concentrating the solid-phase floc, then carrying out filter pressing, and returning the obtained concentrated supernatant and filter-pressed effluent to the step 2; and 4, adsorbing the separated water by an organic titanium adsorbent, and discharging the adsorbed water. According to the method, heavy metals, phosphorus and COD in the sewage can be synchronously removed, so that the contents of the heavy metals, phosphorus and COD in the discharged water reach the standard.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method and application of high-COD, high-phosphorus, and heavy metal-containing sewage. Background technique [0002] With the improvement of environmental protection requirements, the discharge of COD, total phosphorus and heavy metals is subject to stricter restrictions. According to GB31571-2015 and GB 31570-2015, the emission limits of COD and total phosphorus are 60mg / L and 1.0mg / L respectively. For areas where the environmental carrying capacity begins to weaken, COD50mg / L and total phosphorus 0.5mg should also be implemented. / L special discharge limit, while the discharge requirements for heavy metals are more stringent. The monitoring point is advanced to the wastewater discharge outlet of the workshop or production facility. Emission limit values ​​are defined. [0003] There are two difficulties in the treatment of high COD sewage containing heav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F11/12C02F11/122C02F101/20C02F101/10
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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