Removal of bacteria from drinking water via filtration
The present invention relates to a method for producing biocidal, porous particles of a cross-linked polymer, and to the porous particles that can be produced according to the method of the invention. The invention further relates to porous particles of an amino-group-containing polymer (polyamine) having a relatively low swelling factor. The porous particles according to the invention are used to remove biological contaminants from water and to bind metal-containing ions from solutions. The present invention further relates to a filter cartridge which contains the porous cross-linked polymer particles according to the invention.
1. A method for preparation of biocidal, porous particles from a crosslinked polymer, comprising:
(a) providing an aqueous suspension containing a polyamine, a crosslinker and a porous inorganic substrate in particulate form at a temperature less than or equal to 10° C. in a mixer for coating of the porous inorganic substrate with the polyamine;
(b) cross-linking the polyamine in pores of the porous inorganic substrate with simultaneous removal of water;
(c) dissolving the porous inorganic substrate to obtain the biocidal porous particles of the crosslinked polyamine, wherein the porous inorganic substrate can be dissolved under aqueous alkaline conditions at a pH>10.
2. The method according to claim 1 , wherein the steps (a) and (b) are repeated at least once.
3. The method according to claim 1 , wherein the crosslinking is done in a stirred reactor.
4. The method according claim 1 , wherein the polyamine is in a non-desalinated state.
5. The method according to claim 1 , wherein the polyamine is a polyvinylamine.
6. The method according to claim 1 , wherein the crosslinked polyamine according to step (c) contains derivatived side groups.