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Sewage treatment method

A sewage treatment method and sewage technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., to achieve the effects of wide application range, fewer types of chemicals, and greater operational flexibility

Inactive Publication Date: 2016-04-27
QINGDAO SEIICHI INTPROP SERVICE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the sewage produced by the acrylic fiber production process in my country contains high concentrations of toxic and refractory organic pollutants, and the wastewater discharged from oil refineries also contains a large number of high molecular weight oil molecules. After being treated by the existing biochemical treatment system, the COD of the biochemical effluent etc. can only barely reach the secondary discharge standard of petrochemical sewage COD

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A. The pH value of the raw water of acrylic fiber biochemical effluent is 6.8-7.5. Take 500ml of raw water sample of acrylic fiber biochemical effluent to be treated, adjust the pH value of the water sample to 5.5-6.0 with H2SO4 solution, and then add 1ml of 100g / L FeSO4·7H2O solution , and then adjust the pH to 2.5-3.0, add 0.1g H2O2 and control its redox potential at 180mv, stir the reaction for 20min, make the agent and the water fully contact, and the reaction is sufficient;

[0026] B. After adjusting the pH of the mixed solution obtained in step A at 8.0 to 9.0 with sodium hydroxide solution, add 0.5 ml of cationic PAM with a concentration of 1 g / L to the mixed solution, and add 0.5 ml of cationic PAM with a concentration of 1 g / L after the reaction for 20 s. L's cationic PAM;

[0027] C, the mixed solution obtained in step B is stirred for 4min under the stirring speed of 100r / min, so that the coagulation reaction is sufficient, and the precipitation is left to s...

Embodiment 2

[0030] A. The pH value of the raw water of acrylic fiber biochemical effluent is 6.8-7.5, take 500ml of the raw water sample of acrylic fiber biochemical effluent to be treated, adjust the pH of the water sample to 5.5-6.0 with H2SO4 solution, and then add the prepared 100g / L FeSO4 ·7H2O solution 3ml, adjust pH to 3.0-3.5, add 0.1g H2O2 and control its redox potential at 190mv, stir and react for 10min, make the agent and water fully contact, and the reaction is sufficient.

[0031] B. After adjusting the pH of the mixed solution obtained in step A to be 8.0 to 9.0 with sodium hydroxide solution, add 1 ml of cationic PAM with a concentration of 1 g / L to the mixed solution, and add 1 ml of cationic PAM with a concentration of 1 g / L after the reaction for 20s. Cationic PAM;

[0032] C, the mixed solution obtained in step B is stirred for 3min at a stirring speed of 200r / min, so that the coagulation reaction is sufficient, and the precipitation is left to stand, and the supernata...

Embodiment 3

[0036] A. The pH value of the raw water of the acrylic fiber biochemical effluent is 6.8-7.5. Take 500ml of the acrylic fiber biochemical effluent to be treated, adjust the pH of the water sample to 5.5-6.0 with H2SO4 solution, and then add 5ml of the prepared 100g / LFeSO4·7H2O solution to adjust pH to 3.5~4.0, add 0.1g H2O2 and control its redox potential at 200mv, stir and react for 15min, make the agent and water fully contact, and the reaction is sufficient;

[0037] B. After adjusting the pH of the mixed solution obtained in step A to be 8.0 to 9.0 with sodium hydroxide solution, add 1 ml of cationic PAM with a concentration of 1 g / L to the mixed solution, and add 1 ml of cationic PAM with a concentration of 1 g / L after the reaction for 20s. Cationic PAM;

[0038] C, the mixed solution obtained in step B is stirred for 5min at a stirring speed of 50r / min, so that the coagulation reaction is sufficient, and the precipitation is allowed to stand, and the supernatant is treat...

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Abstract

The present invention relates to a sewage treatment method for sewage pretreatment and deep treatment, wherein the sewage treatment method has characteristics of high treatment efficiency, high operation flexibility, less agent types, and less agent consumption. The sewage treatment method comprises: A, taking a sewage sample to be treated, adjusting the pH value of the sample to 5.5-6.0, adding FeSO4.7H2O, adjusting the pH value of the sample to 3.0-6.0, adding H2O2, controlling the redox potential at 180-220 mv, and carrying out a stirring reaction for 10-20 min to make the agent and the sample be subjected to a complete contact reaction; B, adjusting the pH value of the mixed liquid obtained in the step A to 8.0-9.0, adding polyacrylamide, and uniformly mixing; and C, stirring the mixing liquid obtained in the step B for 3-5 min at a stirring speed of 50-300 r / min to completely perform a coagulation reaction, and standing to precipitate, wherein the supernatant is the treated effluent.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a sewage treatment method which can be used for sewage pretreatment and advanced treatment. Background technique [0002] The by-product gas in oil refining production, light oil or heavy oil such as naphtha is used as raw material for thermal cracking to produce chemical raw materials such as ethylene and further reaction to synthesize various organic chemical products. The wastewater discharged during this process is called petrochemical wastewater. The wastewater discharged from the production process of synthetic rubber and synthetic plastics, fibers, detergents and other chemical raw materials such as benzene, naphthalene, methanol, glycerol, and acetaldehyde are all petrochemical wastewater, such as: acrylic fiber wastewater, oil refinery wastewater and comprehensive petrochemical industrial park wastewater. Wastewater, the pollutants in the wastewater are complex and highly tox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 徐聪
Owner QINGDAO SEIICHI INTPROP SERVICE CO LTD
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