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Process and equipment for treating waste water

A waste water treatment, waste water technology, applied in the direction of oxidation water/sewage treatment, mixing methods, chemical instruments and methods, etc., can solve the problems of secondary pollution, etc., to increase the circulating liquid speed, reduce operating costs, and increase the degradation rate of pollutants and the effect of ozone utilization

Inactive Publication Date: 2009-06-24
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of foam inhibitors can effectively suppress the generation of foam, it will cause secondary pollution

Method used

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  • Process and equipment for treating waste water
  • Process and equipment for treating waste water
  • Process and equipment for treating waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: In this embodiment, p-nitrophenol is selected as the research object, and phenol-containing wastewater is simulated, and the removal rate can reach more than 90% after 70 minutes of treatment according to the above steps. The detailed operating conditions and processing results are as follows:

[0017] 1. Operating conditions:

[0018] Gas flow rate: 4.1L / h; liquid phase flow rate: 4.3L / h; ozone concentration: 91mg / L; p-nitrophenol concentration: 25mg / L; pH: 5.9

[0019] 2. Experimental results:

[0020] Response time (minutes) 0 10 20 30 40 50 60 70 80 Nitrophenol removal rate (%) 0 19 36 51 63 73 81 90 91

Embodiment 2

[0021] Embodiment 2: In this embodiment, p-nitrophenol is selected as the research object, and phenol-containing wastewater is simulated, and the removal rate can reach more than 90% after 80 minutes of treatment according to the above steps. The detailed operating conditions and processing results are as follows:

[0022] 1. Operating conditions:

[0023] Gas flow: 3.4L / h; liquid flow: 4.3L / h: ozone concentration: 25mg / L; p-nitrophenol concentration: 87mg / L; pH: 9.5

[0024] 2. Experimental results:

[0025] Response time (minutes) 0 10 20 30 40 50 60 70 80 Nitrophenol removal rate (%) 0 19 44 60 70 78 83 86 91

Embodiment 3

[0026] Embodiment 3: In this embodiment, Orange II is selected as the research object to simulate dye wastewater, operate according to the above steps, and the decolorization rate can reach more than 90% after 60 minutes of treatment. The detailed operating conditions and processing results are as follows:

[0027] 1. Operating conditions:

[0028] Gas flow rate: 4.8L / h; liquid phase flow rate: 4.3L / h; ozone concentration: 22mg / L; dye solution concentration: 103mg / L; pH: 8.5

[0029] 2. Experimental results:

[0030] Response time (minutes) 0 10 20 30 40 50 60 Nitrophenol removal rate (%) 0 52 62 75 82 89 96

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Abstract

The invention relates to a wastewater treatment method. The ozone gas is passed through a hollow fiber membrane in contact with the wastewater, and the ozone gas is transferred to the wastewater through the hollow fiber membrane and undergoes an ozonation reaction with the organic pollutants therein, thereby removing the organic pollution in the wastewater. thing. A kind of waste water treatment equipment, comprises ozone generator, waste water processor, ozone tail gas treatment device and waste water storage tank, is provided with hollow fiber membrane in waste water processor, and one end of hollow fiber membrane communicates with the inlet chamber of waste water processor, The other end communicates with the air outlet chamber of the waste water processor. The invention combines the membrane technology with the ozone technology so that the gas phase and the liquid phase do not directly contact, avoiding the generation of foam and the secondary pollution caused by the foam inhibitor; at the same time, the huge mass transfer area provided by the hollow fiber membrane is used to strengthen the ozone The mass transfer allows more ozone in the gas phase to be transferred to the liquid phase through the hollow fiber membrane for ozonation reaction, which improves the degradation rate of pollutants and the utilization rate of ozone.

Description

technical field [0001] The invention relates to a wastewater treatment method and equipment. Background technique [0002] Ozone has the advantages of strong oxidation ability, fast reaction rate and no secondary pollution when treating refractory organic wastewater, especially the advantages that carcinogens will not appear in the process of chlorination. However, the cost of ozone is as high as other oxidants, and the transfer rate of ozone from the gas phase to the liquid phase is low in traditional gas-liquid contact equipment such as bubble towers, resulting in low utilization of ozone. Therefore, the application of ozone in water treatment is limited. limit. In addition, in these gas-liquid contacting devices, the gas phase is in direct contact with the liquid phase, and under certain conditions (such as the presence of surfactants), excessive foaming will be generated, and these foams will require further treatment. Although the use of foam inhibitors can effectivel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/78B01F3/04
Inventor 张晖夏强张道斌王文杰
Owner WUHAN UNIV