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Method for treating organic waste water by iron complexing Fenton reaction

A technology of organic wastewater and Fenton reaction, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of low degradation efficiency of organic wastewater and low production of active free radicals problems, to achieve the effect of promoting stable production, reducing precipitation, and avoiding disproportionation and decomposition

Inactive Publication Date: 2019-05-10
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem that the production of active free radicals is low and the degradation efficiency of organic wastewater is not high.

Method used

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  • Method for treating organic waste water by iron complexing Fenton reaction
  • Method for treating organic waste water by iron complexing Fenton reaction
  • Method for treating organic waste water by iron complexing Fenton reaction

Examples

Experimental program
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Effect test

Embodiment 1

[0031] At room temperature, the FeSO 4 ·7H 2 The three reagents of O, oxalic acid and calcium peroxide, single system, two-two system and three systems were respectively added to the methyl orange solution with a concentration of 50mg / L and a volume of 100mL for reaction, and the FeSO in the obtained reaction solution 4 ·7H 2 The molar concentrations of O, oxalic acid and calcium peroxide were 1.5 mM, 3 mM and 3 mM, respectively. see results figure 2 .

[0032] Result analysis: After 15 minutes of reaction, in "oxalic acid", "FeSO 4 ·7H 2 O" "calcium peroxide", "oxalic acid + FeSO 4 ·7H 2 O" and "oxalic acid + calcium peroxide", almost no methyl orange degradation; secondly, in the "FeSO 4 ·7H 2 Under the action of "O+Calcium peroxide", the degradation rate of methyl orange was only 34%; while under the action of "FeSO 4 ·7H 2 O+oxalic acid+calcium peroxide" (that is, iron-complexed Fenton-like system), the degradation rate of methyl orange reaches 99.1%. figure ...

Embodiment 2

[0034] At room temperature, when adding FeSO 4 ·7H 2 In the case of O and oxalic acid, different volumes of calcium peroxide are added to a methyl orange solution with a concentration of 50 mg / L and a volume of 100 mL for reaction to obtain FeSO in the reaction solution. 4 ·7H 2 The molar concentrations of O and oxalic acid were 1.5mM and 3mM respectively, and the concentrations of calcium peroxide were 0.75mM, 1.5mM, 3mM, 4.5mM and 6mM respectively. see results image 3 .

[0035]Result analysis: When the molar concentration of calcium peroxide is 0.75mM, 1.5mM, 3mM, 4.5mM, 6mM, corresponding to curves 8, 9, 10, 11 and 12, the degradation rates of methyl orange after 15 minutes of reaction are respectively 69.4%, 94%, 99.1%, 96.8%, 96.8%.

Embodiment 3

[0037] At room temperature, in FeSO 4 ·7H 2 Under the premise that the molar ratio of O and oxalic acid is 1:2, 0.75mM, 0.3mM, 1.5mM, 3mM FeSO 4 ·7H 2 O and proportional oxalic acid and calcium peroxide were added to the methyl orange solution with a concentration of 50 mg / L and a volume of 100 mL for reaction, and the molar concentration of calcium peroxide in the resulting reaction solution was 3 mM. see results Figure 4 .

[0038] Analysis of the results, when FeSO 4 ·7H 2 When the dosage of O is 0.3mM, 0.75mM, 1.5mM and 3mM respectively, it corresponds to curves 13, 14, 15 and 16 in turn. After 15 minutes of reaction, the degradation rates of methyl orange were 31.7%, 85.5%, 99.1%, and 97.4%, respectively.

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Abstract

The invention provides a method for treating organic waste water by an iron complexing Fenton reaction, and belongs to the field of environmental waste water treatment. The method includes the following steps: sequentially adding oxalic acid, FeSO4*7H2O and calcium peroxide into organic waste water for degradation reaction. In the method, the oxalic acid and the FeSO4*7H2O can generate a ferric oxalate complex; calcium peroxide is a solid source of hydrogen peroxide, which is convenient for transportation and storage; the ferric oxalate complex reacts with CaO2 to obtain a Fenton-like system,which can promote stable generation of *OH, avoid disproportionation and decomposition of H2O2, and improve the utilization rate of H2O2; and meanwhile, the addition of the oxalic acid can prolong theexistence time of free Fe2+ / Fe3+ and further reduce the precipitation of iron mud, and thus the removal efficiency of organic matters in waste water by the Fenton-like system is improved. Compared with the traditional Fenton method, the method can be applied to organic waste water with a pH value of 3-11.

Description

technical field [0001] The invention relates to the technical field of environmental wastewater treatment, in particular to a method for treating organic wastewater by iron-complexing Fenton-like reaction. Background technique [0002] For a long time, industrial organic wastewater has been one of the important sources of water environment pollution in my country. This type of organic wastewater usually has high concentration, complex composition, and contains a large amount of refractory organic matter that is difficult to degrade. Moreover, the organic matter in organic wastewater is easy to accumulate and migrate in the water body, with many types and quantities, and the pollution range is wide and harmful. Therefore, the degradation of organic wastewater has become an urgent problem to be solved. [0003] Traditional physical, biological, and chemical methods can no longer meet the requirements for efficient treatment of organic wastewater. Advanced Oxidation Technology ...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F101/38
Inventor 袁德玲张晨唐首锋
Owner YANSHAN UNIV
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