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Method for removing sulfite in wastewater

A sulfite and sulfite technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as high sulfate ion concentration, inability to meet national discharge standards, and inability to recycle catalysts

Inactive Publication Date: 2021-09-10
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The primary purpose of the present invention is to overcome the problem that the concentration of sulfate ions in the effluent of the above-mentioned prior art treatment of sulfite wastewater is too high and thus cannot meet the national discharge standards and the catalyst cannot be recycled, and provide a method for removing sulfite in wastewater

Method used

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  • Method for removing sulfite in wastewater
  • Method for removing sulfite in wastewater
  • Method for removing sulfite in wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A method for removing sulfite in wastewater, comprising the steps of:

[0043] S1. If figure 1 As shown, add sulfuric acid to the sodium sulfite wastewater through the acid adding device to adjust the pH to 3, add ferric sulfate to maintain the concentration ratio of iron ions and sulfite ions in the wastewater at 1:1;

[0044] S2. Turn on the blower pump to aerate the wastewater and stir the reaction for 20 minutes, discharge the wastewater after the reaction into the sedimentation tank, add calcium hydroxide through the alkali adding device to adjust the pH of the wastewater to 8, let it settle for 2 hours, and dissolve the calcium sulfate suspension The sedimentation tank is discharged from the outlet at the upper end, and the ferric hydroxide precipitate that is insoluble in water under alkaline pH is separated from the reaction solution through the outlet at the lower end by a plate-and-frame filter or a belt filter, and the water is discharged.

[0045] The conc...

Embodiment 2

[0047] A method for removing sulfite in wastewater, comprising the steps of:

[0048] S1. If figure 1 As shown, add hydrochloric acid to the sodium sulfite wastewater through the acid adding device to adjust the pH to 2, add iron powder, and maintain the concentration ratio of iron ions and sulfite ions in the wastewater at 0.5:1;

[0049] S2. Turn on the blower pump to aerate the waste water and stir it for 50 minutes, discharge the waste water after the reaction into the sedimentation tank, add calcium hydroxide through the alkali adding device to adjust the pH of the waste water to 7, let it settle for 0.5 h, and suspend the calcium sulfate The material is discharged from the sedimentation tank from the outlet at the upper end, and the ferric hydroxide precipitate that is insoluble in water under alkaline pH is separated from the reaction solution through the outlet at the lower end by a plate-and-frame filter or a belt filter, and the water is discharged.

[0050] The conc...

Embodiment 3

[0052] A method for removing sulfite in wastewater, comprising the steps of:

[0053] S1. If figure 1 As shown, add hydrochloric acid to the potassium sulfite wastewater through the acid adding device to adjust the pH to 4, add ferric chloride to maintain the concentration ratio of iron ions and sulfite ions in the wastewater at 5:1;

[0054] S2. Turn on the blower pump to aerate the waste water and stir the reaction for 40 minutes, discharge the waste water after the reaction into the sedimentation tank, add calcium hydroxide through the alkali adding device to adjust the pH of the waste water to 9, let it settle for 6 hours, and dissolve the calcium sulfate suspension The sedimentation tank is discharged from the outlet at the upper end, and the ferric hydroxide precipitate that is insoluble in water under alkaline pH is separated from the reaction solution through the outlet at the lower end by a plate-and-frame filter or a belt filter, and the water is discharged.

[005...

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Abstract

The invention discloses a method for removing sulfite in wastewater. The method comprises the following steps: S1, adding inorganic acid into sulfite wastewater to adjust a pH value to 2-5, adding an iron-based material, and maintaining the concentration ratio of iron ions to sulfite ions in the wastewater to be (0.5-10): 1; and S2, conducting aerating, stirring and reacting for 10-50 minutes, adding calcium hydroxide to adjust the pH value of the wastewater to 7-10, carrying out standing and precipitating for 0.5-8 hours, removing calcium sulfate, and discharging water. According to the method disclosed by the invention, active species can be generated while sulfite in the wastewater is removed, and the active species can quickly oxidize and degrade organic pollutants in the wastewater. Meanwhile, sulfate ions obtained by conversion of the sulfite ions can form powdery CaSO4 with calcium ions, and the concentration of the sulfate ions in effluent can meet the national emission standards in China by removing CaSO4.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, more specifically, to a method for removing sulfite in wastewater. Background technique [0002] Sulfite has strong reducibility, and is often used as a reducing agent in the printing and dyeing industry, a protective agent for photographic developer or fixer, an antiseptic and preservative for food, a bleaching agent, a bacteriostatic agent and antioxidant for wine, and beer production Bacteriostatic agents, antioxidants, masking aging flavors, thickeners in starchy foods, etc., used in flue gas desulfurization processes in petroleum refineries, metallurgy, garbage disposal, etc., pesticides, chemicals, chemical pulping and papermaking, coal-fired Industries such as power generation often produce wastewater containing large amounts of sulfites. [0003] One of the main methods for treating sulfite wastewater at present is the air oxidation method, using a fan to blow air into the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/34C02F101/38C02F101/10
CPCC02F1/66C02F1/74C02F1/727C02F1/725C02F2101/38C02F2101/101C02F2101/34C02F2001/007
Inventor 罗路娜庞素艳郭钦江进
Owner GUANGDONG UNIV OF TECH
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