Membrane distillation process using hollow fiber membrane component to treat printing and dyeing wastewater

A printing and dyeing wastewater and fiber membrane technology, which is applied in the field of membrane distillation technology, can solve the problems of high power consumption and difficult treatment of concentrated water, and achieve the effects of reducing pretreatment requirements, simplifying the treatment process, and reducing operation and maintenance costs

Inactive Publication Date: 2012-07-11
DD WATER GRP
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing ultrafiltration + reverse osmosis double-membrane recycling process has very strict requirements for pretreatment, consumes a lot of power, and produces more difficult-to-treat concentrated water

Method used

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  • Membrane distillation process using hollow fiber membrane component to treat printing and dyeing wastewater
  • Membrane distillation process using hollow fiber membrane component to treat printing and dyeing wastewater
  • Membrane distillation process using hollow fiber membrane component to treat printing and dyeing wastewater

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Embodiment Construction

[0019] Such as figure 1 As shown, a membrane distillation process using hollow fiber membrane modules to treat printing and dyeing wastewater includes the following steps:

[0020] Step 1: Pretreatment of printing and dyeing wastewater: pass the printing and dyeing wastewater into the grid sump to remove large floating objects, then enter the regulating tank for water quality adjustment and continuously aerate to prevent precipitation, and then enter the degreasing tank to remove grease;

[0021] Step 2: Membrane distillation treatment: pass the pretreated wastewater into the constant temperature water heater, use the low-quality heat source generated in the printing and dyeing process to exchange heat with the constant temperature water heater, heat the wastewater to 50-60 degrees Celsius, and then pass it into the water heater equipped with hollow fibers In the membrane distillation tank of the membrane module, when the wastewater has not passed through the hollow fiber memb...

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Abstract

The invention provides a membrane distillation process using a hollow fiber membrane component to treat printing and dyeing wastewater, which comprises the following steps of: 1, pretreatment of the printing and dyeing wastewater; and 2, membrane distillation: making pretreated wastewater flow into a constant-temperature water heater, heating the wastewater to 50-60 DEG C via heat exchange of a low-quality heat source produced in the printing and dyeing process and the constant-temperature water heater, making the wastewater flow into a membrane distillation tank with the hollow fiber membrane component, and making cold water of 10-15 DEG C flow into a hollow fiber membrane of the hollow fiber membrane component from a constant-temperature cold water tank when the hollow fiber membrane component is soaked in the wastewater so as to form a temperature difference between inside and outside the hollow fiber membrane. Therefore, water vapor in the wastewater can move from the outer side to the inner side of the fiber membrane and can be condensed by cold water on the inner side of the fiber membrane to be discharged. The desalination rate of wastewater treatment can be improved greatly. Meanwhile, the pretreatment requirements can be reduced, the treatment can be simplified, energy can be saved, emissions can be reduced, and the operating and maintenance costs can be decreased.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a membrane distillation process for treating printing and dyeing wastewater by using a hollow fiber membrane module. Background technique [0002] Membrane distillation is a membrane separation process that uses a hydrophobic microporous membrane and uses the vapor pressure difference on both sides of the membrane as the driving force for mass transfer. When aqueous solutions at different temperatures are separated by a hydrophobic microporous membrane, due to the hydrophobicity of the membrane, the aqueous solutions on both sides cannot pass through the pores of the membrane to enter the other side, but because the water vapor pressure at the interface between the warm side solution and the membrane is higher than that of the cold side , the water vapor will enter the cold side from the warm side through the membrane hole and condense, which is very similar to the evaporation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36C02F1/08C02F1/44
CPCY02A20/124Y02A20/131
Inventor 傅叶明吴益尔冯涛金王勇顾汝佳朱春军
Owner DD WATER GRP
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