PROCESS FOR PRODUCING SHAPED CONTACT-FILTRATION MEMBER, SHAPED CONTACT-FILTRATION MEMBER, FILTRATION APPARATUS, AND METHOD OF PROCESSING SOILED WATER

摘要

Disclosed is a process for producing a shaped contact-filtration member, comprising: extruding through a nozzle a heat-melted thermoplastic resin in a form of strand and causing the strand to flow down and be deposited in a frame having an opening with a prescribed horizontal shape, wherein the framer is moved in horizontally two-dimensionally relative to the falling strand of thermoplastic resin and the falling strand is cooled so as to cause the strand in a half-solid state to flow down and be deposited in the framer, thereby providing the resultant shaped contact-filtration member with a controlled porosity of 50 - 90 %. The thus- formed shaped contact-filtration member comprises a laminate of melt-bonded strands formed of a solidified and deposited product of melted strand of thermoplastic resin, wherein a plurality of horizontal layers of deposited strand are stacked in a vertical direction. The contact-filtration member is light in weight and shows a good balance of water permeability and water-quality improvement effect. By disposing plural species of the shaped contact-filtration member so that the diameters of the thermoplastic resin strands become successively smaller, there is provided a filtration apparatus which exhibits excellent water-quality improvement effect and little increase in water filtration pressure and is particularly suitable for various waste waters having a large degree of soiling, and also a method of processing soiled water using the filtration apparatus.