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Method and device for treating wastewater by advanced oxidation process

A technology for wastewater treatment and advanced oxidation, which is applied in the fields of oxidized water/sewage treatment, chemical instruments and methods, and multi-stage water/sewage treatment. The effect of improved ozone utilization rate, improved treatment efficiency and simple process flow

Active Publication Date: 2013-06-12
ZHONGBEI UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the single use of ozone oxidation technology to treat wastewater has long treatment time, large power consumption, high cost, and O 3 Toxic, poor water solubility, low utilization rate; the reaction selectivity of single ozone and organic matter is strong, it is impossible for ozone to completely mineralize pollutants in a low dose and in a short period of time, and it will produce more difficult to handle intermediate products, preventing the further development of ozone oxygen
However, the Fenton method has high processing costs, and a large amount of toxic intermediate products will be produced during the processing process, which will easily cause secondary pollution.
Therefore, it is still the focus of research to seek a joint process technology that can solve the problem of poor water solubility of ozone, improve the utilization rate of ozone, reduce the cost of wastewater treatment, shorten the treatment time, and will not cause environmental pollution.

Method used

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Examples

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Embodiment 1

[0050] Example 1: Treatment of high-concentration printing and dyeing wastewater in a printing and dyeing factory. Wastewater is dark brown, chromaticity 1200~1500 times, COD Cr 15000~32000mg / L. Adjust the pH of the wastewater to 2. Micro-electrolysis was used to pretreat 15L of wastewater, the amount of iron powder added was 30g / L, the mass ratio of iron to carbon was Fe:C=1:1, the reaction time was 1.5h, and the stirring speed of the agitator was 800r / min. COD Cr Reduced by 30~50%, chromaticity decreased by about 20%; adjust the volume flow rate of micro-electrolyzed water and hydrogen peroxide to 5:1, the added H 2 o 2 The amount is about 0.05mol / L, and the liquid-gas ratio of micro-electrolysis water and ozone is adjusted to 50L / m 3 , the ozone concentration is 10mg / L, COD after 2 hours of reaction Cr The removal rate reaches 60%, and the chroma removal rate reaches more than 95%. While using IS-RPB as a wastewater treatment device, the IS-RPB device has an inner di...

Embodiment 2

[0051] Embodiment 2: Treatment of nitrobenzene wastewater. The concentration of nitrobenzene in the wastewater is 300mg / L, and the pH value is adjusted to 2.5. Take 25L of water samples, and use micro-electrolysis p-nitrobenzene wastewater to pretreat, the reaction time is 1h, the stirring speed is 200r / min, the iron powder addition is 20g / L, and the iron-carbon mass ratio is 3:1. Its reduction rate is above 90%, and the liquid-gas ratio of micro-electrolysis water and ozone is 200L / m 3 , the ozone concentration is 30mg / L, adjust the flowmeter so that the volume flow ratio of the micro-electrolyzed water and hydrogen peroxide is 8:1, H 2 o 2 The concentration is 0.03mol / L, the rotating speed of the impinging flow rotating packed bed is 1500rpm, the inner diameter of the IS-RPB device is 8cm, the initial impact velocity is 4m / s, the distance between the outlets of the two inlet pipes is 5 / 12 of the inner diameter of the rotating packed bed, and stainless steel is used. Porou...

Embodiment 3

[0052] Example 3: Treatment of nitrotoluene waste water from a propellant and explosive factory. Wherein the concentration of trinitrotoluene in the wastewater is 20mg / L, the concentration of dinitrotoluene is about 100mg / L, and the biochemical coefficient is only 0.1. Adjust the pH to 3.0 with dilute sulfuric acid. Take 200L of water samples, and use micro-electrolysis to pretreat the wastewater. The amount of iron powder added is 10g / L, the mass ratio of iron to carbon is 0.5:1, the stirring speed is 500r / min, and the reaction time is 1.5h. More than % of nitro compounds are converted into aniline substances, adjust the volume flow ratio of micro-electrolysis effluent to hydrogen peroxide to 10:1, the concentration of hydrogen peroxide is 0.01mol / L, and the liquid-gas volume ratio of micro-electrolysis effluent to ozone is 400L / m 3 , the ozone concentration is 50mg / L, the impingement flow-rotating packed bed speed is 300rpm, the inner diameter of the IS-RPB device is 10cm, ...

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Abstract

The invention belongs to the technical field of treatment for industrial production wastewater, and particularly relates to a method and a device for treating wastewater by an advanced oxidation process, which solve the shortages in the existing methods for treating industrial wastewater. The method comprises the following steps of: performing micro-electrolysis reduction reaction on wastewater; impinging the wastewater with hydrogen peroxide in liquid-liquid reaction equipment; forming Fenton reagent by Fe<2+> and hydrogen peroxide in the wastewater; and performing contact reaction on the wastewater and ozone in the liquid-liquid reaction equipment. The device comprises an impinging stream-rotating packed bed device, wherein nozzles are formed at the outlets of two liquid inlet tubes respectively, the two nozzles are coaxial and the outlets are oppositely arranged, the two liquid inlet tubes are connected with a hydrogen peroxide storage tank and a micro-electrolysis tank respectively, and liquid outlets are connected with the micro-electrolysis tank; and an intake port is connected with an ozone generator, and an exhaust port is connected with a KI adsorption liquid storage tank. The method and the device disclosed by the invention have the beneficial effects that the technical process is simple, the operation is convenient, and wastes are used for treating wastes, thus furthest reducing the treatment cost.

Description

technical field [0001] The invention belongs to the technical field of industrial production wastewater treatment, and in particular relates to a method and device for treating wastewater by an advanced oxidation method, which uses physical adsorption, electrochemical reduction technology, Fenton method oxidation technology and ozone catalytic oxidation technology for coupling treatment. . Background technique [0002] Micro-electrolysis technology was proposed by former Soviet scientists in the 1970s and used for the treatment of printing and dyeing wastewater. This method is a process technology that uses the principle of metal corrosion to form a primary battery to treat wastewater, also known as internal electrolysis. The electrodes of micro-electrolysis generally use two or more materials with a large potential difference. In the absence of an external electric field, the potential difference between the cathode and the anode forms a battery effect and produces physica...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/72C02F1/78C02F1/38C02F1/28C02F1/461
Inventor 焦纬洲刘有智张巧玲祁贵生袁志国高璟栗秀萍申红艳刘文丽
Owner ZHONGBEI UNIV
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