Preparation of high-hydrophobicity hollow fiber membrane and desulfurization wastewater treatment method thereof
A desulfurization wastewater, fiber membrane technology, applied in water/sewage treatment, heating water/sewage treatment, water/sludge/sewage treatment, etc.
Inactive Publication Date: 2020-05-19
上海翊科聚合物科技有限公司
View PDF8 Cites 3 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0022] Preparation of hollow fiber membranes.
[0023] Using N-methylpyrrolidone (NMP) or dimethylacetamide (DMAC) as solvents, prepared nano-TiO containing 20wt% PVDF, 5wt% porogen, 1.5wt% hydrophobically modified 2 The casting solution of the sol, and vacuum defoaming of the prepared solution. A metering pump is used to extrude the casting solution from the hollow fiber membrane spinning head at a certain linear speed. The primary membrane enters the external flocculation tank after going through an air bath stroke with a length of 5-10 cm, and then passes through the retracting device at a certain line speed. Speed curl. The ratio of the extrusion speed of the casting solution to the stretching speed of the nascent film is between 2:30 and 2:50.
[0024] Characterization of hollow fiber membranes.
[0025] Soak the prepared hollow fiber membrane in tap water at room temperature for two days, and then obtain a highly hydrophobic hollow fiber membrane after solvent excha...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More 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...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D67/00C02F1/44C02F1/04C02F103/18
CPCB01D69/08B01D67/0079B01D67/0013C02F1/447B01D2325/38C02F2103/18Y02A20/124Y02A20/131
Inventor 查尚文罗健
Owner 上海翊科聚合物科技有限公司