Biofilm filter device, desalination system, and biofilm filter device cleansing method

• Main Author: MATSUI, KATSUNORI
• Format: Patent
• Language: English
• Published: 28.07.2016
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

This biofilm filter device (20) removes, using a biofilm which is formed on a filter medium layer (22), impurities which are mixed in a liquid to be treated which is made to flow into the filter medium layer (22) from an upstream side and discharges a filtered liquid from a downstream side, said device (20) comprising: a wash water supply unit (51) which supplies wash water from the downstream side of the filter medium layer (22); and a control unit (52) which controls the flow speed of the wash water which is supplied by the wash water supply unit (51). The control unit (52) supplies the wash water at a first flow speed whereat only a layer of a prescribed range on the upstream side of the filter medium layer fluidizes, and then supplies the wash water at a second flow speed whereat the whole of the filter medium layer (22) does not fluidize.