Film separation device, structure for arranging film element, and film cassette and film unit

A film cassette equipped with film elements, comprising:

• a plurality of film elements each equipped with a filtration body section for conducting a solid-liquid separation, a water collecting section that collects a treated water, which has been obtained by the solid-liquid separation, from one end section of the filtration body section, and a sealing section that liquid-tightly seals another end section of the filtration body section;
• a pair of lower retaining sections on which the water collecting sections and the sealing sections of the film elements are placed in a condition that the film elements are aligned;
• and
• a treated-water collecting section that collects the treated water from the water collecting sections in a condition that the treated-water collecting section is connected to upper end sections of the water collecting sections,
• wherein the water collecting section is formed at an upper end section thereof with a treated-water takeout section that is fitted to the treated-water collecting section,
• wherein a clip plate section that aligns the treated-water takeout sections is interposed between the water collecting sections and the treated-water collecting section,
• wherein the treated water collecting section comprises a water collecting body section, an upper end pipe section, and a lower end pipe section,
• wherein the water collecting body section is formed with:
• connecting holes which are arranged at even intervals in a longitudinal direction of the water collecting body section and into which the treated-water takeout sections are fitted,
• a water collecting path that communicate with the connecting holes,
• a communicating water path that communicates with the water collecting path, and
• a water passage that communicates with the communicating water path,
• wherein the upper end pipe section and the lower end pipe section are respectively vertically connected an upper end section and a lower end section of the water collecting body section to communicate with the water passage.