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Efficient wastewater treating process based on Fenton reaction

A wastewater treatment and Fenton reaction technology, which is applied in water/sewage multi-stage treatment, neutralized water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem of large sludge production, large amount of reagents, high cost of wastewater treatment, etc. problem, to achieve the effect of increasing B/C value, reducing total dosage, and reducing dosage

Active Publication Date: 2011-11-16
江苏艾特克环境工程设计研究院有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Fenton method has incomparable advantages over the general chemical oxidation method in the treatment of refractory organic wastewater. However, in the currently used Fenton reaction process for wastewater treatment, the amount of Fenton reagent is large, and H 2 o 2 The use efficiency is not high, the amount of sludge produced in the wastewater treatment process is large, and there are more H in the treated wastewater 2 o 2 , must be removed with a large amount of neutralizing agent, resulting in long reaction time, low utilization rate of hydrogen peroxide, resulting in high waste water treatment costs, large sludge production and other shortcomings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] At room temperature, take COD Cr 500mL of dye wastewater with a pH of 380mg / L, a pH of 6, and a turbidity of 97 NTU is placed in the oxidation tank;

[0021] (1) First, adjust the pH value of the dye wastewater to 3.6 with sulfuric acid, and then add 30% H 2 o 2 (The specific gravity is about 1.11) 0.47mL, namely H 2 o 2 The addition amount is 156mg, stir well; while stirring, add 125mg of FeSO 4 ·7H 2 O, stirring for 8 minutes;

[0022] (2) Adjust the pH of the wastewater to 3.6 with NaOH solution, then add 125mg of FeSO 4 ·7H 2 O, stirring for 8 minutes;

[0023] (3) Repeat step (2) three times again, the total FeSO added 4 ·7H 2 O is 625mg. After determination, the residual H in the above-mentioned treated wastewater 2 o 2 rare.

[0024] (4) Adjust the pH to 7.5-8 with NaOH solution, and flocs of ferric iron appear; then introduce the treated water into the sedimentation tank, add 0.025mL of CWR-MO flocculant, and then undergo flocculation, precipitatio...

Embodiment 2

[0033] At room temperature, take COD Cr 500mL of printing and dyeing waste with a pH of 852mg / L, a pH of 6, and a turbidity of 98NTU is placed in the oxidation tank.

[0034] (1) First adjust the pH value of the dye wastewater to 4.0 with sulfuric acid, then add 30% H 2 o 2 0.90mL, namely H 2 The amount of O added is 300mg, stir well; add 200mg of FeSO while stirring 4 ·7H 2 O, stir for about 5 minutes;

[0035] (2) Adjust the pH value of the wastewater to 4.0 with NaOH solution, then add 200 mg of FeSO 4 ·7H 2 O, stirred for 5 minutes;

[0036] (3) Repeat step (2) four times, adding a total of 1200mg of FeSO 4 ·7H 2 O. After determination, the above-mentioned treated wastewater was determined to be H 2 o 2 Very little residue;

[0037] (4) Adjust the pH to 7.5-8.0 with NaOH solution, and flocs of ferric iron appear; the treated water enters the sedimentation tank, and 0.025mL of CWR-MO flocculant is added; then flocculation, precipitation, and solid-liquid separ...

Embodiment 3

[0046] At room temperature, take COD Cr 500mL of pharmaceutical wastewater with a concentration of 353mg / L, a pH of 7, and a turbidity of about 54NTU is placed in the oxidation tank.

[0047] (1) adjust the pH value of pharmaceutical wastewater to 4.5 with sulfuric acid, then add 0.47mL of 30% H 2 o 2 , namely H 2 o 2 The addition amount is 156mg, stir evenly, add 125mg of FeSO while stirring 4 ·7H 2 O, stirring for 6 minutes;

[0048] (2) Adjust the pH value of the wastewater to about 4.0 with NaOH solution, and then add FeSO 4 ·7H 2 O 125 mg, stirred for 6 minutes;

[0049] (3) Repeat step (2) three times, adding FeSO 4 ·7H 2 O 625 mg. After determination, the above-mentioned treated wastewater was determined to be H 2 o 2 Very little residue.

[0050] (4) Use NaOH solution to adjust the pH to 7.5-8.0, and flocs of ferric iron appear; then add 0.025mL of CWR-MO flocculant in the sedimentation tank; Agglomerated sediment.

[0051] Test the COD of treated water...

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Abstract

The invention discloses an efficient wastewater treating process based on Fenton reaction, which comprises the following steps: adjusting the pH value of wastewater to be treated to 3-5; adding H2O2, mixing and stirring; adding FeSO4.7H2O by batch, adjusting the pH value of the wastewater to be treated to 3-5 before adding the FeSO4.7H2O every time, and stirring for 3-10min after adding the FeSO4.7H2O every time; adjusting the pH value of the treated wastewater to 7.5-8; adding flocculating agent, and removing flocculated sediment. The invention quantitatively adds dosage according to the wastewater condition, solves the problem that the treatment effect is influenced because of poor or excessive medicine, improves the use efficiency through adding ferrite by batch, lowers the consumption of the medicine and the sludge quantity, reduces the process procedure of treating residual H2O because of no residual of H2O, controls the hydroxy radical quantity produced immediately by adding H2Oin batch, and effectively treats high-COD and difficult-degradation organic wastewater.

Description

technical field [0001] The invention relates to a waste water treatment process, in particular to a high-efficiency waste water treatment process based on the Fenton reaction. Background technique [0002] In 1894, French scientist Fenton discovered that under acidic conditions, Fe 2+ / H 2 o 2 It can effectively oxidize tartaric acid. In order to commemorate this discovery, Fe 2+ / H 2 o 2 It is named as Fenton's reagent (Chinese translation is Fenton's reagent), and the reaction mediated by Fenton's reagent is called Fenton's reaction (Fenton's reaction). In 1964, Canadian scholar Eisenhaner applied Fenton reagent to water treatment for the first time. He used Fenton's reagent to treat ABS wastewater, and the removal rate of ABS was as high as 99%. Fenton oxidation technology has the characteristics of high efficiency, low cost, and low selectivity. Fenton oxidation method, as an advanced oxidation technology (Advanced Oxidation Process, AOP), is used in the field of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/72C02F1/66C02F1/52
Inventor 吴智仁徐畅稻垣广人高卫民徐岗杨才千舒杰
Owner 江苏艾特克环境工程设计研究院有限公司
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