On April 25, the Kinki Industrial Archaeology Society held its 2026 annual general meeting in collaboration with History Research Institute Otemae University, where a report on the investigation of the former treatment facilities of the Tsumori Sewage Treatment Plant in Osaka City was presented.

Tsumori Sewage Treatment Plant, the oldest sewage treatment plant in Osaka City, has evolved alongside the development of the city's sewage system since its opening in 1940, and continues to play a vital role as a core treatment plant. Numerous old treatment facilities, including buildings, structures, and machinery dating back to the time of its opening, remain, some of which are still in operation. These old treatment facilities are important legacies for understanding the equipment, configuration, and treatment technology of the early days of the sewage system in the pre-war Showa era, as well as the history of Osaka City's sewage treatment plant business.

Otemae University History Research Institute, with the cooperation of the Osaka City Construction Bureau, conducted a survey over approximately five years and published the results in March 2026, titled "Osaka City Tsumori Sewage Treatment Plant Former Treatment Facility Survey Report." This event was held as part of the 80th anniversary celebrations of Otemae Educational Corporation to commemorate its completion.

The morning session included an introduction to three-dimensional measurement and a tour of the facilities by Associate Professor Atsushi Okamoto of the Faculty Faculty of Modern Social Studies Otemae University, while the afternoon session featured greetings and a presentation on the history of History Research Institute by Professor Toru Kaigara of the Faculty of Faculty of Intercultural Japanese Studies at the same university, followed by research reports from Visiting Researcher Tatsuro Nikaido of History Research Institute and the Hanshin Cultural Heritage Building Research Association.

(Source: History Research Institute)