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Method for synchronously removing chlorite and organic pollutants in water by combining sulfite and inorganic peroxide

A technology of inorganic peroxides and organic pollutants, applied in the field of water treatment

Pending Publication Date: 2021-09-24
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of the prior art, provide a method capable of efficiently synchronously removing chlorite and organic pollutants in water, avoid the generation of chlorate by-products, and solve the ubiquitous problems of chlorite and organic pollutants. Coexistence of various toxic and harmful organic pollutants in water

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  • Method for synchronously removing chlorite and organic pollutants in water by combining sulfite and inorganic peroxide
  • Method for synchronously removing chlorite and organic pollutants in water by combining sulfite and inorganic peroxide

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Embodiment 1

[0030] The water to be treated is slightly polluted source water, in which TOC is 6.8mg / L, dissolved oxygen is 5.9mg / L, and initial pH is 8.2. After pre-oxidation treatment with chlorine dioxide (4.0mg / L), the concentration of chlorite The concentration of chlorate is 2.5mg / L, the concentration of chlorate is 0.3mg / L, and the concentration of target pollutant naproxen is 1.0mg / L.

[0031] The present embodiment is carried out as follows: adjust the pH value of the above-mentioned water to be treated to 6.0, first add hydrogen peroxide (25mg / L) and fully stir, feed high-purity oxygen, so that the dissolved oxygen concentration is 7.9mg / L, Then 70mg / L sodium sulfite was added, the reaction was stirred and samples were taken to test the concentration of remaining naproxen, chlorite and chlorate. The result is as figure 1 Shown, when reacting 1min, the removal rate of naproxen reaches more than 90% ( figure 1 a). When the reaction time reaches 2min, the removal of chlorite can ...

Embodiment 2

[0033] The water to be treated is a simulated water sample of aniline wastewater, in which the concentration of aniline is 10 mg / L, the initial pH is 5.0, the concentration of dissolved oxygen is 6.8 mg / L, and the concentration of chlorite is 6.7 mg / L.

[0034] The present embodiment is carried out as follows: add calcium peroxide (15mg / L) to the above-mentioned water to be treated and fully stir, feed high-purity oxygen so that the dissolved oxygen concentration is 8.0mg / L, then add sodium sulfite, the initial concentration of sodium sulfite 200mg / L, stirred and reacted for 10min, sampled and tested the remaining aniline, chlorite, and chlorate concentration. like figure 2 Shown, when reacting 1min, the removal rate of aniline is 30% ( figure 2 a), the concentration of residual sodium chlorite is 0.5mg / L, and the concentration of chlorate generated is 0.4mg / L ( figure 2 b), all meet the limit requirements (0.7mg / L) in my country's "Urban Water Supply Quality Standards". R...

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Abstract

The invention relates to a method for synchronously removing chlorite and organic pollutants in water by combining sulfite and inorganic peroxide. The method comprises the following steps: firstly, adding a certain amount of inorganic peroxide into water to be treated, fully stirring, then introducing oxygen to ensure a proper dissolved oxygen concentration, and then adding sulfite according to a certain proportion to rapidly remove the chlorite in water by using the reducibility of sulfite, and oxidizing free radicals with high reaction activity are formed under an aerobic condition to degrade organic pollutants coexisting in water, wherein the peroxide can stabilize chlorine dioxide generated in the reaction process and control the chlorine dioxide to be converted into chlorate. The method is mild in use condition, wide in applicable pH range, low in application cost, simple in treatment process and short in reaction time, raw materials are low in price and easy to obtain, chlorite and organic pollutants in water are synchronously removed, meanwhile, generation of chlorate by-products is inhibited, and the method has application and popularization prospects.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a method for synchronously removing chlorite and organic pollutants in water by combining sulfite and inorganic peroxide. Background technique [0002] Chlorine dioxide (ClO 2 ) is a strong oxidant, which has the functions of removing algae, removing trace organic pollutants, decolorizing and deodorizing, and can control the generation of disinfection by-products such as trihalomethanes and haloacetic acids. Therefore, it is used in the treatment of slightly polluted source water and industrial wastewater applications are receiving more and more attention. However, there are still deficiencies in the use of chlorine dioxide. On the one hand, chlorine dioxide chemically reacts with reducing substances such as some natural organic matter and organic pollutants contained in water to produce inorganic by-products such as chlorite (ClO 2 – ), the amount produced is about 5...

Claims

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Application Information

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IPC IPC(8): C02F1/70C02F1/72C02F1/76C02F101/12C02F101/30
CPCC02F1/70C02F1/722C02F1/727C02F1/76C02F2101/12C02F2101/30C02F2101/305C02F2101/306C02F2101/308C02F2305/02
Inventor 关小红邵彬彬张欣董磊
Owner TONGJI UNIV
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