Method for recycling fenton sludge through two-step calcining method

A Fenton sludge and calcination technology, which is applied in the field of water pollution control, can solve the problems of secondary pollution, unfriendly environment, and high cost of Fenton sludge treatment, and achieve the effect of simple operation, environmental friendliness and simple method

Inactive Publication Date: 2018-12-18
SICHUAN AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem solved by the present invention is: a method for recovering Fenton sludge by a two-step calcination method, which solves ...

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  • Method for recycling fenton sludge through two-step calcining method
  • Method for recycling fenton sludge through two-step calcining method

Examples

Experimental program
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Embodiment 1

[0027] The present embodiment provides the investigation of the temperature and time of the first calcination of the present invention, specifically as follows:

[0028] Using the Fenton method to treat simulated urotropine wastewater: adjust the pH of the wastewater to 4, and then add 5g / L FeSO 4 and 15g / L of H 2 o 2 , adding alkali after the reaction, adjusting the pH value to 7, and standing for precipitation. The obtained precipitate is Fenton sludge, and its main components are FeOOH and organic matter; the Fenton sludge is dehydrated to a water content of 15wt%.

[0029] Five parts of the dehydrated Fenton sludge were taken, weighed, placed in a muffle furnace, calcined at different temperatures for different times, and weighed. Divide the weight of Fenton's sludge after calcining by the weight of Fenton's sludge before calcining to obtain the weight ratio before and after calcining, so as to investigate the oxidation of organic matter in Fenton's sludge. The results a...

Embodiment 2

[0038] The present embodiment provides the investigation of the temperature and time of the second calcination of the present invention, specifically as follows:

[0039] Take the first calcined product calcined at 500°C for 5 hours and carbon powder in Example 1 and mix them evenly in a mass ratio of 84:16, divide them into 5 parts, put them into tube furnaces respectively, and heat them at different temperatures Calcined under different conditions for different times to obtain the second calcined product, the 5 parts of the second calcined product were analyzed by X-ray diffractometer respectively, the results are shown in the attached figure 2 As shown, namely:

[0040] When the calcination temperature is lower than 500°C, the iron of the second calcined product is Fe 2 o 3 exists in the form of

[0041] When the calcination temperature was 500°C, a small amount of Fe began to appear in the second calcined product 3 o 4 ;

[0042] When the calcination temperature is ...

Embodiment 3

[0048] The present embodiment provides the method that the two-step calcination method of the present invention reclaims Fenton's sludge, specifically:

[0049] Using the Fenton method to treat simulated urotropine wastewater: adjust the pH of the wastewater to 4, and then add 5g / L FeSO 4 and 15g / L of H 2 o 2, add alkali after the reaction, adjust the pH value to 7, let it stand for precipitation, the obtained sediment is Fenton sludge, and its main components are FeOOH and organic matter;

[0050] Dewatering the Fenton sludge to a water content of 15 wt%;

[0051] The dehydrated Fenton sludge is placed in a muffle furnace, and calcined at 500° C. for 3 hours, the calcined carbon dioxide and water are discharged, and the solid obtained by calcining is the first calcined product. After the first calcination, the organic matter in the Fenton sludge has been completely oxidized to generate carbon dioxide and water, and the main component of the first calcined product is Fe pro...

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Abstract

The invention discloses a method for recycling fenton sludge through a two-step calcining method and solves the problems that fenton sludge in the prior art has high cost, is prone to generate secondary pollution and is unfriendly to the environment. The method disclosed by the invention comprises the following steps: dewatering fenton sludge; primarily calcining to obtain a first calcined product; adding carbon powder into the first calcined product, evenly mixing, secondarily calcining to obtain a second calcined product; magnetically separating the second calcined product to respectively obtain Fe3O4 and residual materials. The method disclosed by the invention has the advantages of scientific design, simpleness, convenience in operation, ability in recycling iron resources in fenton sludge and environmental friendliness.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to a method for recovering Fenton sludge by a two-step calcination method. Background technique [0002] The Fenton reaction was accidentally discovered by Fenton HJ in 1893, and it has a history of more than 100 years. Research on the Fenton method also emerged in an endless stream during this period, but it has only begun to be applied on a large scale in the field of sewage treatment in the past 10 years. In recent years, in the field of wastewater treatment in my country, the standards have become increasingly stringent. Many types of wastewater can no longer be treated by traditional biological methods. Because the Fenton process is the most mature and simplest process in the advanced oxidation process, it is gradually used in the sewage treatment industry. It pops inside. However, a large amount of iron-containing sludge is produced during the oper...

Claims

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Application Information

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IPC IPC(8): C02F11/10
CPCC02F11/10
Inventor 张延宗王博刘燕刘维仪
Owner SICHUAN AGRI UNIV
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