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Method for treating sewage by three-phase internal-circulation fluidized bed photocatalytic reaction

A technology of photocatalytic reaction and three-phase internal circulation, which is applied in the direction of light water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problem of low utilization rate of light source and achieve efficient mass transfer effect

Active Publication Date: 2014-12-03
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of low utilization rate of light source in photocatalytic reaction, and provide a simple and practical three-phase internal circulation with high light source utilization rate, good catalyst mass transfer effect, integration of reaction and separation, continuous operation Photocatalytic Reaction Method for Treating Sewage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Three 28W ultraviolet lamps are arranged in an equilateral triangle as the light source, and the 50mg / L methyl orange solution to be treated is used to simulate high-concentration dye sewage at 0.6L / min (if the water flow rate is so large, the residence time is only 1h, and the effluent treatment rate is estimated) Only 40% should be changed to 0.2 / L) The water inlet pipe enters the reactor, and the TiO2 catalyst is added, and the dosage is 1.0g / L. At the same time, the blower is started to blow air through the inlet pipe to continuously aerate the aerator, and the air flow rate is 0.4 L / min keeps the catalyst in a fluidized state and promotes water circulation; the rising air pushes the reaction liquid and catalyst up from the guide tube, and under the action of the guide cover, the reaction liquid is deflected to the lower part of the sedimentation tank of the reactor, After aeration, it rises to form a state of fluidization and internal circulation. At the same time, ...

Embodiment 2

[0024]Three 20W ultraviolet lamps are arranged in an equilateral triangle as the light source, and the 20mg / L methyl orange solution to be treated to simulate low-concentration dye sewage enters the reactor through the 0.4L / min inlet pipe, and adds TiO 2 Catalyst, the dosage is 1.4g / L. At the same time, start the blower to blow air into the aerator through the intake pipe to continuously aerate the aerator. The reaction liquid and catalyst rise from the guide tube, and under the action of the guide cover, the reaction liquid is diverted to the lower part of the sedimentation tank of the reactor, and then rises through aeration to form a state of fluidization and internal circulation. The sedimentation section outside the shroud rises slowly, passes through the conical sloping plate of the reactor for one year to remove dust, and obtains treated clean water. Part of the unreacted catalyst and some pollutants reach the bottom of the reactor through precipitation, and are mixed wi...

Embodiment 3

[0027] Using a 90W low-pressure mercury lamp (PL-L, double-tube H-type) as the light source, the 30mg / L methyl orange solution simulated medium-concentration dye sewage to be treated enters the reactor through the 0.3L / min water inlet pipe, and the TiO2 catalyst is added. The dosage is 1.2g / L. At the same time, start the blower to blow air through the intake pipe to continuously aerate the aerator. The air flow rate is 0.6L / min, so that the catalyst remains in a fluidized state and promotes water circulation; the rising air promotes the reaction liquid. And the catalyst rises from the guide tube, under the action of the guide cover, the reaction liquid is deflected to the lower part of the sedimentation tank of the reactor, and then rises slowly through the conical inclined plate, and the solids sink to form a state of fluidization and internal circulation At the same time, the treated sewage enters the reactor through the conical inclined plate for one year to remove dust, and...

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Abstract

The invention discloses a method for treating sewage by three-phase internal-circulation fluidized bed photocatalytic reaction. The method uses a three-phase internal-circulation photocatalytic reactor designed by the inventor: sewage to be treated and 1.0-1.7 g / L catalyst are added into the reactor to be mixed; air is introduced at 0.4-0.6 L / min and rises in a guide pipe; under the action of a guide hood, catalyst-carried pollutants are efficiently degraded in the reaction zone,and enter the outside of the guide hood through internal circulation to implement internal-circulation flow, and the sewage reaction and standing time is 1-3 hours; the sewage and waste water from a water inlet pipe are mixed again under the turbulent action of aeration and subjected to the next reaction period; the treated liquid slowly rises through a conical chute board, and solid matters sink to the bottom of the reactor to deposit; the treated clear water is discharged from a water outlet pipe arranged on the upper section of the reactor; and the gas is discharged from a gas outlet pipe on the top of the reactor. The reactor effectively implements three-phase separation of continuous solid matters, catalyst, gas and effluent water, and the pollutant removal rate is approximately 100%, thereby implementing integration of reaction and separation.

Description

field of invention [0001] The invention belongs to the technical field of sewage treatment, and specifically relates to a three-phase internal circulating fluidized bed photocatalytic reaction treatment method for sewage with high light source utilization rate, good catalyst mass transfer effect and integrated reaction and separation. Background technique [0002] With the continuous development of my country's industrialization, the treatment of industrial sewage with high concentration, complex components, toxic and refractory substances, and poor biodegradability has become a hot spot in water treatment. For example, petroleum, chemical, pesticide, pharmaceutical, printing and dyeing sewage, etc., it is difficult to achieve stable and efficient treatment in conventional sewage treatment processes, and advanced oxidation methods are generally used for such toxic and harmful sewage. where TiO 2 Photocatalytic technology is an efficient deep oxidation process, which can eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/30C02F1/32C02F1/52
Inventor 喻泽斌李明洁孙蕾
Owner GUANGXI UNIV
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