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Phenol wastewater treatment method

A treatment method, phenol technology, applied in water/sewage treatment, oxidized water/sewage treatment, special compound water treatment, etc., can solve the problems of low iron ion circulation efficiency, waste post-treatment efficiency, low utilization rate of hydrogen peroxide, etc.

Pending Publication Date: 2021-10-08
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional Fenton technique due to Fe 2+ The dosing of hydrogen peroxide leads to low utilization rate of hydrogen peroxide and low efficiency of iron ion circulation, resulting in H 2 o 2 The characteristics of waste and low post-processing efficiency
Zero-valent iron powder can realize Fe 2+ The supplementary release of iron powder, but the rapid formation of iron oxide layer on the surface of iron powder prevents the reaction from proceeding

Method used

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preparation example Construction

[0050] In the preparation of the described zerovalent iron sulfide, the present invention first prepares a compound containing CH 3 COOH and CH 3 COONa buffer solution, and removing oxygen in the buffer solution to obtain a deoxidizing solution.

[0051] In certain embodiments of the present invention, in the buffer solution, CH 3 The concentration of COONa is 1.00~2.50mol / L, CH 3 The concentration of COOH is 0.10 to 0.16 mol / L. In certain embodiments, in the buffer solution, CH 3 The concentration of COONa is 1.2mol / L, CH 3 The concentration of COOH was 0.10 mol / L.

[0052] In certain embodiments of the present invention, the pH of the buffer solution is 5.5-6.5. In certain embodiments, the pH of the buffer solution is 6.0.

[0053] The present invention has no special limitation on the preparation method of the buffer solution, and the preparation method of the buffer solution well known to those skilled in the art can be used for preparation.

[0054] In some embodime...

Embodiment 1

[0091] (1) Preparation of oxygen removal solution: Add 200mL deionized water into a three-necked flask, add 20.00g (243mmol) of anhydrous CH 3 COONa was stirred until it was completely dissolved, and then 1.20 mL (20 mmol) of CH 3 COOH to obtain a buffer solution (pH value is 6.0), and nitrogen gas was passed into the buffer solution for 30 minutes to eliminate oxygen in the buffer solution to obtain a deoxygenated solution.

[0092] (2) Preparation of catalyst: 8.0g iron powder is added in the described deaeration solution, feed nitrogen 30min in the solution obtained, add 3.0g sodium sulfide nonahydrate and 0.1g sulfur powder, continue feeding nitrogen, in The reaction was performed under mechanical stirring at 20° C. for 4 h at a rotational speed of 500 rpm. At the end of the reaction, the pH of the solution became 10.5.

[0093] (3) Washing and drying of the catalyst: transfer the reacted solid-liquid mixture into a centrifuge tube, centrifuge for 5min (rotating speed is...

Embodiment 2

[0101] (1) Preparation of deoxygenation solution: add 200 mL of deionized water into a three-necked bottle, add 30.00 g of anhydrous CH 3 COONa was stirred until completely dissolved, and then 1.40 mL of CH was added. 3 COOH to obtain a buffer solution (pH value is 6.0), and nitrogen gas was introduced into the buffer solution for 30 min to remove oxygen in the buffer solution to obtain a deoxygenated solution.

[0102] (2) preparation of catalyst: 10g of iron powder was added to the deoxidizing solution, nitrogen was introduced into the solution obtained for 30min, 4.0g of sodium sulfide nonahydrate was added, nitrogen was continuously introduced, and the rotating speed was 500rpm for 22 minutes. The reaction was mechanically stirred for 4h. At the end of the reaction, the pH of the solution became 11.0.

[0103] (3) washing and drying of catalyst: transfer the reacted solid-liquid mixture into a centrifuge tube, centrifuge for 5min (rotating speed is 4000rpm), remove super...

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Abstract

The invention relates to the technical field of water treatment, in particular to a phenol wastewater treatment method, which comprises the following steps: carrying out a stirring reaction on phenol wastewater, sulfurized zero-valent iron and hydrogen peroxide to obtain treated phenol wastewater, wherein the sulfurized zero-valent iron is prepared according to the following steps: A) preparing a buffer solution containing CH3COOH and CH3COONa, and removing oxygen in the buffer solution to obtain a deoxygenized solution; B) under the condition of protection gas, carrying out a stirring reaction on the deoxygenated solution, iron powder and sodium sulfide nonahydrate to obtain a solid-liquid mixture; and C) carrying out solid-liquid separation on the solid-liquid mixture, and drying the obtained solid substance to obtain the sulfurized zero-valent iron. According to the invention, the surface of the sulfurized zero-valent iron is partially sulfurized, released Fe<2+> and zero-valent iron (ZVI) form a homogeneous cocatalyst system, the high electronic state density of FeS forms a heterogeneous system for efficiently enriching and activating H2O2, and the two systems are coupled to realize rapid degradation of COD in the phenol wastewater.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for treating phenol wastewater. Background technique [0002] In recent years, with the development of industry, the discharge of wastewater has been increasing, and the situation of water pollution in my country has become increasingly severe. Industrial wastewater has the characteristics of complex types of pollutants, high COD (chemical oxygen demand) content, and high treatment costs. Therefore, it is of great significance to develop efficient pollution conversion technology to achieve rapid degradation of COD in industrial wastewater and improve its biodegradability for alleviating the pressure on my country's water environment. [0003] The advanced oxidation technology represented by the Fenton technology can degrade the high concentration of COD in chemical wastewater with complex composition, because the hydroxyl radicals generated by the Fenton reactio...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F101/34
CPCC02F1/725C02F2305/026C02F2101/345
Inventor 刘贤伟曹旭周晓丽
Owner UNIV OF SCI & TECH OF CHINA
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