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Application of hollow fiber nano-filtration membrane in removal of As in water body

A technology of nanofiltration membrane and composite nanofiltration membrane, which is applied in the field of water treatment, can solve problems such as difficult to meet separation requirements, and achieve the effects of improving the drinking water environment, simple manufacturing process, and large infiltration water output

Inactive Publication Date: 2014-05-14
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, almost all nanofiltration arsenic removal studies use commercial nanofiltration membranes, and the operating pressure of the flat membranes used in the research is generally in the tens to tens of bars, and the permeation water is generally less than 5L / m 2 *h*bar, and the operating conditions below 10bar are also difficult to meet the separation requirements
[0007] Summarizing the current preparation methods and application technologies of nanofiltration membranes, there is no material for one-step removal of trivalent arsenic and pentavalent arsenic in water

Method used

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  • Application of hollow fiber nano-filtration membrane in removal of As in water body
  • Application of hollow fiber nano-filtration membrane in removal of As in water body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Dissolving sulfonated polyether ether ketone in methanol solution to prepare a solution with a sulfonated polymer concentration of 0.5%, and then mixing manganese dioxide nanoparticles with a particle size of 10 nm into the above solution to form a uniformly mixed coating solution, control The weight ratio of the manganese dioxide particles to the sulfonated polymer is 1 / 3. Apply it to the PVDF hollow fiber ultrafiltration base membrane with a single coating (the inner and outer diameters are 0.9mm and 1.4mm respectively), and post-treat the membrane for 6 hours in an environment of 65 degrees Celsius to obtain an effective coating (that is, an effective separation layer) ) hollow fiber nanofiltration membrane, the effective coating thickness of the sulfonated polyether ether ketone composite nanofiltration membrane is 5 μm, the nanofiltration membrane is assembled into a hollow fiber nanofiltration membrane module and used as attached figure 1 The device shown performs...

Embodiment 2

[0063] Dissolve sulfonated polyetheretherketone in methanol solution to prepare a coating solution with a sulfonated polymer concentration of 1.0%, and coat it on the PES hollow fiber ultrafiltration base membrane (the base membrane MWCO is 100000Da, and the inner and outer diameters are 0.9 / 1.3mm), the membrane was post-treated for 6 hours in an environment of 65 degrees Celsius to obtain a hollow fiber nanofiltration membrane with an effective coating. The effective coating thickness of the sulfonated polyether ether ketone composite nanofiltration membrane is 5-10 μm. The membrane is assembled into a hollow fiber nanofiltration membrane module and utilized as attached figure 1 The device shown performs arsenic removal.

[0064] The raw material liquid is natural water (TDS 550mg / L, hardness CaCO 3 650mg / L) by adding diarsenic trioxide and sodium arsenate to make the concentration of trivalent arsenic reach 100μg / L and the concentration of pentavalent arsenic reach 300μg / L...

Embodiment 3

[0066] Dissolve sulfonated polysulfone in methanol solution to prepare a solution with a sulfonated polymer concentration of 1.0%, and then mix manganese dioxide nanoparticles with a particle size of 10 nm into the above solution to form a uniformly mixed coating solution to control the manganese dioxide The weight ratio of particles to sulfonated polymer is 1 / 2. It is coated on the PES hollow fiber ultrafiltration base membrane (inner and outer diameter of 0.8 / 1.3mm) with a single coating, and the membrane is post-treated for 6 hours in an environment of 65 degrees Celsius to obtain an effective coating (that is, an effective separation layer). Hollow fiber nanofiltration membrane, the effective coating thickness of the sulfonated polysulfone composite nanofiltration membrane is 9-10 μm, the nanofiltration membrane is assembled into a hollow fiber nanofiltration membrane module and loaded into the attached figure 1 In the arsenic removal application device.

[0067] The conc...

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Abstract

The invention provides an application of a hollow fiber nano-filtration membrane in removal of trivalent As and pentavalent As in a water body at the same time. The hollow fiber nano-filtration membrane is a low pressure hollow fiber sulfonated polymer coating composite nano-filtration membrane prepared by a coating method, and comprises a hollow fiber ultrafiltration base membrane and an effective separation layer coated on the inner surface of the hollow fiber ultrafiltration base membrane; and the effective separation layer is a sulfonated polymer coating containing manganese dioxide micro-nano particles capable of oxidizing the trivalent As. The hollow fiber nano-filtration membrane can be used for effectively intercepting the As in the water body, and the handling capacity of the As in the water body is 10-10000mu g / L. After the hollow fiber nano-filtration membrane is applied, under the condition that the operation pressure of removing the As in the water body is only 3-10bar, the rejection rate of the As is more than 95%, and the osmosis water yield is high and reaches up to more than 10L / m<2>.h.bar; and compared with a commercial flat-plate nano-filtration membrane, the hollow fiber nano-filtration membrane has the advantages that higher osmosis water flux can be obtained under the lower operation pressure, and meanwhile, the rejection rate of the hollow fiber nano-filtration membrane is equivalent to that of the commercial nano-filtration membrane.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to the application of a hollow fiber nanofiltration membrane material for simultaneous removal of trivalent arsenic and pentavalent arsenic in water bodies, and the preparation and application of the material. Background technique [0002] Arsenic and its compounds are recognized by many authoritative organizations such as the International Cancer Research Institute (IARC) under the World Health Organization (WHO) and the United States Environmental Protection Agency (US-EPA) as the first class of human carcinogens identified. Due to the enrichment effect of arsenic in organisms, even low levels of arsenic, long-term exposure can easily lead to the occurrence of cancers such as liver, lung, bladder and kidney. Arsenic pollution in water sources has become an important environmental problem worldwide. In 1993, WHO lowered the standard limit of arsenic in drinking water fro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D69/08B01D61/08B01D67/00C02F1/44
Inventor 何涛李雪梅宋健峰姜标王建
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI