Aeration module

An aeration module capable of aerating a liquid supplied to inner portions of hollow-fiber membranes, comprising:

• a housing containing a fluororesin as a main component;
• and
• a plurality of the hollow-fiber membranes containing polytetrafluoroethylene or a modified polytetrafluoroethylene as a main component,
• wherein a porosity K [%], an average thickness T1 [mm], and an average outer diameter D2 [mm] of the hollow-fiber membranes satisfy a relation of a formula (1) below:
• K
• /
• (
• T
• ⁢
• 1
• ×
• D
• ⁢
• 2
• ×
• 100
• )
• ≥
• 2.
• ;
• (
• 1
• )
• wherein the hollow-fiber membranes have a heat of fusion of 30 J/g to 45 J/g, as measured by differential scanning calorimetry (DSC), wherein the heat of fusion is defined as an integrated endothermic heat amount from 296° C. to 343° C. obtained in a third heating step of a DSC measurement that includes a first heating step, a second heating step, and the third heating step, and
• wherein the hollow-fiber membranes have an average outer diameter D2 of 0.70 mm or less, an average inner diameter D1 of 0.32 mm or less, and a porosity K of 30% or more.