Technological process and apparatus for advanced oxidation degradation of nitrobenzene wastewater

A technology of advanced oxidation and process method, which is applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., can solve the problems of slow degradation rate of nitrobenzene, meet the treatment requirements, and high cost, and reduce water treatment Cost reduction, reduction in handling costs, and ease of operation

Active Publication Date: 2009-06-24
ZHONGBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, studies have shown that if any oxidation method is used alone to treat nitrobenzene water, the degradation rate of nitrobenzene is extremely slow and cannot meet the treatment requirements in a short period of time.
Ultrasonic / ozone method, as a combined method, has improved the processing efficiency to a certain extent, but it is still unacceptable to enterprises due to the long time-consuming and high cost

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  • Technological process and apparatus for advanced oxidation degradation of nitrobenzene wastewater
  • Technological process and apparatus for advanced oxidation degradation of nitrobenzene wastewater

Examples

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Embodiment 1

[0038] Example 1: Treatment of dinitrotoluene (DNT) in wastewater from explosives and propellant plants. The initial concentration of dinitrotoluene in the wastewater is 195mg / L. Using ozone oxidation method to treat 10L / h wastewater, the volume ratio of wastewater to ozone is 500L / m 3 , The ozone concentration is 13.5mg / L, after 180min of degradation, the removal rate of dinitrotoluene is only 10%; the ultrasonic / ozone method is used for treatment, the treatment volume is unchanged, the ozone concentration is unchanged, and the ultrasonic sound intensity is 1W / cm 2, Frequency is 28kHz, pH=11, after 180min, the removal rate of dinitrotoluene is 30%; ozone and DNT wastewater undergo gas-liquid mass transfer reaction in a rotating packed bed to complete the preliminary degradation of wastewater, and then the wastewater enters Ultrasonic-electrolyzed wastewater is treated in a reaction tank. Ultrasonic sound intensity, frequency and concentration of ozone remain unchanged, use ammoni...

Embodiment 2

[0039] Example 2: Treatment of chloronitrobenzene wastewater. Nitro-containing benzene organics in wastewater mainly include nitrophenol, nitrobenzene, and chloronitrophenol, with a total concentration of 21mg / L, and wastewater COD of 1103mg / L. Using ozone / electrolysis method to treat 80L / h wastewater, the ozone concentration is 10mg / L, and the surface is coated with Ti RuO 2 It is anode, stainless steel is cathode, current density is 40mA / cm 2 After 180 minutes of degradation, the total removal rate of nitrophenol, nitrobenzene, and chloronitrophenol is 70%, and the removal rate of COD is 20%; ozone and chloronitrobenzene wastewater undergo gas-liquid mass transfer in a rotating packed bed Reaction, the liquid-gas volume ratio of wastewater to ozone is 50L / m 3 , The ozone concentration is 10mg / L, the preliminary degradation of wastewater is completed, and then the wastewater enters the wastewater reaction tank equipped with ultrasonic- / electrolysis for treatment. Ultrasonic sound...

Embodiment 3

[0040] Example 3: Treatment of nitrophenol wastewater. Equipped with 100mg / L nitrophenol solution, the processing capacity is 5L / h, ozone and nitrophenol wastewater undergo gas-liquid mass transfer reaction in the packed tower, and the liquid-to-gas volume ratio of wastewater to ozone is 100L / m 3 , The ozone concentration is 18mg / L, complete the preliminary degradation of wastewater, and then the wastewater enters the wastewater reaction tank equipped with ultrasonic-electrolysis for treatment. Ultrasonic sound intensity is 50W / cm 2 , The frequency is 40kHz, the pH is adjusted by NaOH=10, and the current density is 10mA / cm 2 , The lead dioxide electrode is the anode, and the stainless steel is the cathode. After 60 minutes of treatment, the removal rate of nitrophenol reaches 98%.

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Abstract

The invention belongs to the technical field of nitrobenzene class wastewater treatment and in particular relates to a process method for advanced oxidation and degradation of nitrobenzene class wastewater. The invention solves the problem that the prior method for degrading nitrobenzene class wastewater has long time consumption and high cost. The method comprises that: wastewater and ozone undergo full haptoreaction in gas-liquid mass transfer equipment; after the haptoreaction, the wastewater enters a coupling reactor consisting of an ultrasonic wave field and an electrolysis field; and nitrobenzene class substances in the wastewater are degraded under the synergistic action of ultrasonic wave and micro-electrolysis. The device comprises the gas-liquid mass transfer equipment; a gas inlet of the gas-liquid mass transfer equipment is connected with an ozone generator; a liquid inlet of the gas-liquid mass transfer equipment is connected with a nitrobenzene class wastewater pool; a liquid outlet of the gas-liquid mass transfer equipment is connected with the wastewater coupling reactor; and the bottom of the wastewater coupling reactor is provided with an ultrasonic wave generator. The process method has the following advantages: the process method has simple process flow and convenient operation, farthest reduces treatment cost and can be applied to various organic industrial wastewater such as phenol-containing wastewater, detonator wastewater, dye wastewater, wastewater in a petrochemical enterprise, detergent wastewater and the like.

Description

Technical field [0001] The invention belongs to the technical field of nitrobenzene wastewater treatment, and specifically relates to a process method for advanced oxidation degradation of nitrobenzene wastewater, which adopts the combined treatment of ozone technology, ultrasonic technology and electrolysis technology. Background technique [0002] Nitrobenzene compounds are difficult to degrade toxic organic pollutants. Due to their strong material toxicity, they are listed as priority pollutants at home and abroad. The traditional treatment methods of this type of wastewater include extraction, adsorption and biological methods. However, due to the stable structure of nitrobenzene, in practical engineering applications, it is often difficult to obtain satisfactory treatment with conventional processes and biological treatment methods. The treatment effect. [0003] In recent years, a lot of research has been done on the degradation of pollutants by deep and advanced oxidation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F9/08C02F1/78C02F1/36C02F1/461C02F101/38
Inventor 刘有智祁贵生焦纬洲袁志国
Owner ZHONGBEI UNIV
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