Filtration member, concentration apparatus, and concentration method

A concentration method performed by a concentration apparatus comprising:

• a filtration member comprising pores having a pore diameter through which microorganisms may pass and configured to have a positive charge or a negative charge upon application of a voltage;
• a power supply configured to apply the voltage to the filtration member;
• a sample water supply disposed upstream of the filtration member and configured to supply sample water;
• a flushing water supply disposed upstream of the filtration member in parallel with the sample water supply and configured to supply flushing water;
• a sample water supply pipe connected to an upstream pipe disposed upstream of the filtration member and configured to supply the sample water from the sample water supply to the filtration member;
• a flushing water supply pipe branched from and connected to the upstream pipe and configured to supply the flushing water to the filtration member;
• an outlet disposed downstream of the filtration member and configured to discharge fluid externally;
• and
• a collection container disposed downstream of the filtration member in parallel with the outlet and configured to collect fluid,
• the concentration method comprising:
• filtering the sample water by supplying the sample water from the sample water supply to the filtration member while the voltage is applied to the filtration member by the power supply;
• and
• collecting a concentrate of microorganisms captured by the filtration member by supplying the flushing water from the flushing water supply to the filtration member while the application of the voltage from the power supply to the filtration member is stopped.