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Method for treating sewage by Fenton process

A sewage and oxidant technology, applied in the direction of oxidized water/sewage treatment, etc., can solve the problems of limited promotion and application, poor technical economy, increased investment and operating costs, etc., to reduce sludge volume, treatment cost, and dosage. Effect

Active Publication Date: 2013-01-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods can improve the treatment effect to a certain extent, they bring a substantial increase in investment and operating costs, making the economics of the technology worse, thus limiting the promotion and application

Method used

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  • Method for treating sewage by Fenton process

Examples

Experimental program
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Effect test

Embodiment 1

[0023] To treat the high-concentration sewage of an oil refinery that still does not meet the standard after the secondary biochemical treatment, the Fenton reaction is carried out by using two-stage series fully mixed flow reactors, and the dosage of each stage is 50mg / LH 2 o 2 , the total dosage is 100mg / L, and the catalyst is FeSO 4 , and make n(Fe 2+ ) / n(H 2 o 2 )[Fe 2+ Ions and H 2 o 2 The molar ratio] reached 0.7, with H 2 SO 4 The pH of the treated sewage is controlled at about 3.0, and the hydraulic retention time is 1h. Compared with the traditional Fenton process, one-time dosing of 100mg / LH 2 o 2 , other conditions are the same as the method of the present invention. The results of the two methods are shown in Table 1. The results in Table 1 show that the influent COD is 135.7mg / L, and the H 2 o 2 When the dosage is the same, the effluent COD of the method of the present invention is 78.4mg / L, and the effluent COD of the traditional Fenton method is 93...

Embodiment 2

[0027] To treat the difficult-to-biochemical sewage that still does not meet the standard after three-stage BAF treatment in a chemical company, four-stage fully mixed-flow reactors in series are used for Fenton reaction, and the dosage of each stage is 25mg / LH 2 o 2 , the total dosage is 100mg / L, and the catalyst is Fe(NO 3 ) 2 , and make n(Fe 2+ ) / n(H 2 o 2 ) to 1.0, use dilute HNO 3The pH is controlled at about 4.0, and the hydraulic retention time is 1h. Compared with the traditional Fenton process, one-time dosing of 100mg / LH 2 o 2 , other conditions are the same as the method of the present invention. The results of the two methods are shown in Table 2. The results in Table 2 show that the influent COD is 124.1 mg / L, the effluent COD of the method of the present invention is 53.0 mg / L, and the effluent COD of the traditional Fenton method is 85.1 mg / L.

[0028] Table 2 Comparison of the efficiency of two Fenton methods for treating substandard sewage in oil ref...

Embodiment 3

[0031] To treat the high-concentration sewage of an oil refinery that still does not meet the standard after secondary biochemical treatment, six-stage fully mixed-flow reactors in series are used, each stage of H 2 o 2 The dosage is 1 / 10 of the current COD value, the total dosage is 105mg / L, and the catalyst is Fe(NO 3 ) 2 , and make n(Fe 2+ ) / n(H 2 o 2 ) to 0.8, use dilute HNO 3 The pH is controlled at about 2.0, and the hydraulic retention time is 1.5h. Compared with the traditional Fenton process, one-time dosing of 105mg / LH 2 o 2 , other conditions are the same as the method of the present invention. The results of the two methods are shown in Table 3. The results in Table 3 show that the influent COD is 254.2 mg / L, the effluent COD of the method of the present invention is 99.3 mg / L, and the effluent COD of the traditional Fenton method is 183.5 mg / L.

[0032] Table 3 Comparison of the effects of two Fenton methods in treating substandard sewage in petrochemica...

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Abstract

The invention provides a method for treating sewage by Fenton process, which comprises: adopting a multistage serial reactor or a single-stage continuous reactor; adding a catalyst in the initial stage of a reaction; adjusting the pH value to 1.5 to 6.5; sequentially adding an oxidizer in the multistage serial reactor or adding the oxidizer at a plurality of points along water flow direction in the single-stage continuous reactor; and controlling the total additive amount of the oxidizer calculated by mg / L to be smaller than sewage COD value calculated by mg / L. Compared with the conventional method using a single-stage Fenton process, the method requires a greatly reduced amount of the oxidizer and the catalyst for achieving the same treatment effect and reduces treatment cost.

Description

technical field [0001] The invention relates to a method for treating sewage, in particular to a method for treating sewage by using the Fenton method. Background technique [0002] The Fenton method is one of the advanced oxidation technologies for water treatment, which refers to the 2 o 2 in Fe 2+ Under the catalysis of the catalyst, strong oxidizing OH is produced, and OH attacks the C-H bond, C=C bond or C≡C bond, causing organic matter to break or ring, and is rapidly oxidized and decomposed. This method is highly efficient and non-toxic, especially has outstanding advantages in the treatment of refractory sewage, which can completely oxidize refractory organic matter into CO 2 and H 2 O, so as to reduce the COD of sewage; it can also partially oxidize the refractory organic matter to biodegradable small molecule oxygenated organic matter (such as alcohol, aldehyde, ketone, carboxylic acid, etc.), thereby improving the biodegradability of sewage. However, because ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72
Inventor 侯钰李本高桑军强
Owner CHINA PETROLEUM & CHEM CORP