Reusable composite filter material, preparation method thereof and method for removing and destroying molecular pollutants in water by using reusable composite filter material
A composite filter and filter material technology, applied in the field of removal of pollutants containing fluorine or fluorine-containing compounds, regeneration of adsorbent/filter, can solve the problem of GAC becoming a harmful material, etc.
Pending Publication Date: 2022-05-13
科勒沃特科技公司
View PDF0 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] While a common method for treating drinking water containing molecular contaminants such as PFA is the use of GAC beds, one difficulty with this method is that once GAC is saturated with molecules such as PFA, the GAC itself becomes a hazardous material , must be dealt with accordingly
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 Construction
[0009] All embodiments of the invention will capture a wide range of molecular contaminants from drinking water over a wide range of concentrations. As a non-limiting example, the expected concentration range of the PFA molecule extends from nanograms per liter to micrograms per liter. Again, without implying any limitation, the focus of the remaining paragraphs of this section will be on the removal of PFA molecules from drinking water within the concentration ranges quoted. Two prominent examples of such PFA molecules are perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS). Without implying any limitation on the choice or configuration of the base (ie, pretreatment) filter material, at least one embodiment of the base filter material is granular activated carbon. The pore width of pretreated GAC can range from a fraction of a nanometer (nm) to greater than 100 nm. The first process step, depositing a thin coating of binding material on at least a portion of ...
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
| Property | Measurement | Unit |
|---|---|---|
| specific surface area | aaaaa | aaaaa |
| size | aaaaa | aaaaa |
| specific surface area | aaaaa | aaaaa |
Login to View More
Abstract
A specific functionalized composite filter material having a high specific surface area is used to adsorb PFA in drinking water. In a preferred embodiment, the base filter material is granular activated carbon (GAC) which is sequentially coated with a thin layer of polydopamine, a thin layer of partially oxidized iron and a thin coating of octadecylamine. After the PFA is adsorbed onto the coated GAC particles, the PFA is removed by a rinsing process and remains in the rinsing effluent. The GAC particles are recovered and re-coated as needed to restore their adsorption capacity. The PFA-containing effluent is treated using a photochemical process to disrupt PFA molecules. Now PFA-free effluents can be treated as harmless materials. The composite filter material is suitable for use in systems from individual small passive systems to large high flow utility water treatment systems.
Description
technical field [0001] The present invention generally relates to the treatment of water by adsorption using composite adsorbents. The present invention more particularly relates to the removal of contaminants containing fluorine or fluorine-containing compounds. The present invention also relates to the regeneration of the adsorbent / filter. Specifically, the invention relates to the removal of molecular contaminants from water and their safe destruction; in particular the removal and destruction of perfluoroalkyl and polyfluoroalkyl molecules, typically the long chain (C=8) molecule perfluorooctanoic acid (PFOA ) and perfluorooctane sulfonate (PFOS) and related short-chain PFAs (C≤7). Background technique [0002] There is ample evidence that a variety of anthropogenic materials exist in the environment today that are persistent and harmful to human (and animal) life. Trace levels of man-made molecules such as perfluoroalkyl and polyfluoroalkyl groups, collectively known...
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): B01D39/02B01D39/04B01D39/20B01J35/00
CPCB01D39/04B01D39/08B01D39/1692B01D39/2017B01D2239/0485B01D2239/0492B01D2239/0428B01D2239/1216B01D39/2027C02F1/281C02F1/285C02F1/288C02F1/32C02F1/725C02F2305/10C02F2303/16C02F1/283C02F2101/301C02F2101/36B01J20/20B01J20/26B01J20/28016B01J20/2808B01J20/28083B01J20/28085B01J20/3071C02F2101/40C02F2303/14
Inventor 康迪·M·弗拉德查德·A·寇丽哲杰森·M·贝利特斯凯德尼斯·M·弗拉德德尼斯·J·弗拉德
Owner 科勒沃特科技公司