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Method for deep oxidation treatment on organic wastewater by activating peroxymonosulfate based on visible light-assisted complexing iron ions

A monoperoxyhydrogensulfate and organic wastewater technology, which is applied in oxidized water/sewage treatment, chemical instruments and methods, light water/sewage treatment, etc., can solve the problem of low CODcr removal efficiency and inability to continuously activate PMS oxidation in organic wastewater Free radicals and other problems, to achieve good CODcr removal effect, reduce treatment costs, and strong oxidation ability

Active Publication Date: 2020-02-04
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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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 solve conventional Fe 2+ In the process of activating PMS to treat organic wastewater, due to Fe 2+ Easily oxidized to form Fe 3+ , unable to continuously activate PMS to generate oxidative free radicals, resulting in low CODcr removal efficiency in organic wastewater and other issues

Method used

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  • Method for deep oxidation treatment on organic wastewater by activating peroxymonosulfate based on visible light-assisted complexing iron ions
  • Method for deep oxidation treatment on organic wastewater by activating peroxymonosulfate based on visible light-assisted complexing iron ions
  • Method for deep oxidation treatment on organic wastewater by activating peroxymonosulfate based on visible light-assisted complexing iron ions

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Under normal temperature conditions, take 250mL of aniline solution with CODcr of 200mg / L and pH=5 in 6 beakers and mark them as 1#, 2#, 3#, 4#, 5#, 6# respectively.

[0034] (1) Add PMS solution to the 1# beaker and mix evenly, turn on the LED light source to irradiate the solution in the beaker at the same time, start timing the reaction, add appropriate amount of lye and calcium hydroxide after 2 hours of reaction and let it stand for 1 hour;

[0035] (2) In the 2# beaker, first add PMS solution and mix evenly, then add ferric chloride solution, the reaction starts timing, after 2 hours of reaction, add appropriate amount of lye and calcium hydroxide and let it stand for 1 hour;

[0036] (3) First add PMS to the 3# beaker and mix evenly, then add freshly prepared ferrous sulfate solution, the reaction starts timing, after reacting for 2 hours, add appropriate amount of lye and calcium hydroxide and let it stand for 1 hour;

[0037](4) First add PMS to the 4# beaker a...

Embodiment 2

[0045] Under normal temperature conditions, take 250mL of aniline solution with CODcr of 200mg / L and pH=10 in 3 beakers and mark them as 1#, 2#, 3#, 4# respectively.

[0046] (1) First add PMS to the 1# beaker and mix evenly, then add freshly prepared ferrous sulfate solution, start timing the reaction, add lye and calcium hydroxide after 2 hours of reaction and let it stand for 1 hour;

[0047] (2) First add PMS to the 2# beaker and mix evenly, then add freshly prepared mixed solution of oxalic acid and ferrous sulfate, start timing the reaction, add lye and calcium hydroxide after 2 hours of reaction and let it stand for 1 hour;

[0048] (3) First add PMS to the 3# beaker and mix well, then add the freshly prepared mixed solution of oxalic acid and ferrous sulfate, at the same time turn on the LED light source to illuminate the solution in the beaker, the reaction starts timing, and add lye and hydrogen after 2 hours of reaction Calcium oxide was allowed to stand for 1 hour;...

Embodiment 3

[0055] Under normal temperature conditions, take 250mL of aniline solution with CODcr of 200mg / L and pH=7 in 2 beakers and mark them as 1# and 2# respectively.

[0056] The PMS in this embodiment adopts KHSO 5 .

[0057] (1) First add PMS to the 1# beaker and mix well, then add the freshly prepared mixed solution of oxalic acid and ferric chloride, at the same time turn on the LED light source to illuminate the solution in the beaker, the reaction starts timing, after 2 hours of reaction, add lye and let it stand 1 hour;

[0058] (2) First add PMS to the 2# beaker and mix well, then add the freshly prepared mixed solution of oxalic acid and ferric chloride, and at the same time turn on the LED light source to illuminate the solution in the beaker, the reaction starts timing, and add lye and hydrogen after 2 hours of reaction Calcium oxide was allowed to stand for 1 hour;

[0059] Control the volume of 1#-2# beakers to be 500mL after adding all the solutions, and the COD con...

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Abstract

The invention relates to a method for deep oxidation treatment on organic wastewater by activating peroxymonosulfate based on visible light-assisted complexing iron ions. The method comprises the following steps: adding PMS (peroxymonosulfate) into initial organic wastewater, performing sufficient mixing, adding a mixed liquid of an oxalate and a trivalent iron salt, performing irradiation with anLED (light emitting diode) lamp and performing a stirring reaction synchronously, adding an alkali liquid and calcium hydroxide, and performing uniform stirring and precipitation, so as to effectively reduce CODcr (dichromate oxidizability) in supernatant tail water. By adopting the method, under the condition that the initial pH value of wastewater is not adjusted, iron ion precipitation is controlled by using a complexing agent, and under the action of visible light, circulation generation of ferrous ions is promoted, the PMS is continuously catalyzed and activated to produce strongly oxidized sulfate radicals, organic pollutants can be effectively oxidized and degraded, and thus CODcr in wastewater can be effectively removed. The method has the characteristics of being good in operability, low in energy consumption, wide in pH value application range, good in oxidation reaction continuity, high in organic matter oxidation degradation efficiency, and the like, and has great application potential in the field of deep wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to a method for deep oxidation treatment of organic waste water based on the activation of complexed iron ions by visible light to activate monoperoxyhydrosulfate (PMS). Background technique [0002] In recent years, water treatment technologies based on sulfate radical oxidation have attracted increasing attention. Sulfate radicals have strong oxidizing power (E 0 =2.5–3.1V), which can be generated by catalytically activating persulfate or PMS through light, heat, electrochemistry, transition metals, etc., and has a good effect on the advanced treatment of organic wastewater. [0003] Among the activation methods of persulfate or PMS, based on Fe 2+ The activation method not only shows a good activation effect, but also has the advantages of low cost and environmental friendliness. It is the best activation method used in the actual wastewater treatmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10C02F101/30
CPCC02F9/00C02F2209/08C02F2001/007C02F1/72C02F1/30C02F1/5236C02F1/58C02F2101/101C02F2101/30C02F2301/08Y02W10/37
Inventor 韩东晖李瑛吴仁人任秀文陈晨荣楠廖文
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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