Abstract: A method for treating an aqueous fluid resulting from a fluorine-containing polymer production step, the method comprising: separating the aqueous fluid into a solid component and a filtrate using a filter aid.

Abstract: A method for removing a fluorine-containing compound from discharge water, which includes bringing discharge water containing two or more fluorine-containing compounds represented by the following general formula (1) or (2) into contact with an adsorbent so as to adsorb the two or more fluorine-containing compounds: (H—(CF2)m—COO)pM1??General Formula (1): wherein m is 3 to 19, M1 is H, a metal atom, NRb4, where Rb is the same or different and is H or an organic group having 1 to 10 carbon atoms, imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent; and p is 1 or 2; (H—(CF2)n—SO3)qM2??General Formula (2): wherein n is 4 to 20; M2 is H, a metal atom, NRb4, where Rb is the same as above, imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent; and q is 1 or 2.

Abstract: A method for treating an aqueous fluid resulting from a fluorine-containing polymer production step, the method comprising: separating the aqueous fluid into a solid component and a filtrate using a filter aid.

Abstract: The present disclosure provides a method for processing a fluorine-containing aqueous solution. The method comprises a reaction step for mixing in a vertical direction the fluorine-containing aqueous solution and a disiloxane compound represented by a general formula RaRbRcSiOSiRdReRf, wherein Ra, Rb, Rc, Rd, Re and Rf are selected independently from each other from a group consisting of a phenyl group and an alkyl group comprising from 1 to 20 carbon atoms and hydrogen, to react a fluorine ion in the fluorine-containing aqueous solution with the disiloxane compound, obtaining a first reaction liquid containing a monofluorosilane compound represented by general formulas RaRbRcSiF and RdReRfSiF.

Abstract: The present disclosure provides a method for processing a fluorine-containing aqueous solution. The method comprises a reaction step for mixing in a vertical direction the fluorine-containing aqueous solution and a disiloxane compound represented by a general formula RaRbRcSiOSiRdReRf, wherein Ra, Rb, Rc, Rd, Re and Rf are selected independently from each other from a group consisting of a phenyl group and an alkyl group comprising from 1 to 20 carbon atoms and hydrogen, to react a fluorine ion in the fluorine-containing aqueous solution with the disiloxane compound, obtaining a first reaction liquid containing a monofluorosilane compound represented by general formulas RaRbRcSiF and RdReRfSiF.

Abstract: The present invention provides a treatment method by which a fluorinated surfactant such as PFOA can be removed from water very efficiently. The treatment method includes a step (1) of contacting a water to be treated containing 100 to 10000 ppb of a fluorinated surfactant with an activated carbon and a step (2) of obtaining a treated water containing not more than 3.0 ppb of the fluorinated surfactant. The activated carbon comprises the particles capable of passing through a 75-?m filter of not smaller than 90% by mass of the total particles.