Preparation of high-hydrophobicity hollow fiber membrane and desulfurization wastewater treatment method thereof

Abstract

The invention provides a preparation method of a high-hydrophobicity hollow fiber membrane anddesulfurization wastewater treatment application of the high-hydrophobicity hollow fiber membrane. The preparation method comprises the following steps: preparing a high-hydrophobicity polymer hollow fiber membrane by adopting a non-solvent phase inversion method; carrying out membrane distillation onpretreated flue gas desulfurization wastewater by using the hollow fiber membrane to realize salt-water separation; wherein flue gas waste heat is used for increasing the temperature of the desulfurization wastewater, and the water flux in the membrane distillation process is increased. The method is characterized in that: by adjusting the ratio of the extrusion rate of a membrane casting solution tothe stretching rate of a primary membrane in the spinning process of the hollow fiber membrane, the high-hydrophobicity hollow fiber membrane which is small in surface pore diameter and attached withhydrophobic particles is obtained. The prepared hollow fiber membrane is used for membrane distillation desalination of flue gas desulfurization wastewater, the flue gas waste heat is used for improving the membrane distillation efficiency, the special surface property of a membrane material is used for slowing down the crystallization of salts on the surface of the membrane and the rate of causing membrane pollution, and an efficient, energy-saving and environment-friendly new method is provided for desalination of desulfurization wastewater.

Description

technical field [0001] The invention relates to the preparation of hollow fiber membranes and the treatment technology of flue gas desulfurization wastewater in thermal power plants, in particular to the use of non-solvent phase inversion method to prepare highly hydrophobic hollow fiber membranes, desalination of desulfurization wastewater by membrane distillation, and utilization of flue gas waste heat Improve the efficiency of membrane distillation. Background technique [0002] Due to the combustion of coal, a large amount of flue gas containing sulfur oxides will be produced in the process of thermal power generation, which must be desulfurized. The commonly used flue gas desulfurization method is to use limestone or lime slurry to wash the flue gas in the reaction tower, but this desulfurization process will generate large amounts of waste water. Flue gas desulfurization wastewater is the main source of wastewater in thermal power plants, and it has a large salt conte...

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Problems solved by technology

[0006] Another important problem faced by membrane distillation is membrane infiltration and membrane fouling caused by salt precipitation on the inner surface of the membrane, as well as the resulting decrease in water flux and reduction in desalination efficiency.

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