Transmembrane pressure difference inference device and diffused air amount control device

A transmembrane pressure inference device comprising:

• an input data acquisition section configured to acquire input data derived from operation data that is measured during a membrane filtration operation which is carried out by a membrane separation device, the operation data including a membrane filtration pressure and a diffused air volume, the membrane separation device comprising:
• a separation membrane disposed so as to be immersed in water to be treated;
• and an air diffusion device configured to perform air diffusion through a membrane surface of the separation membrane, the membrane separation device being configured to obtain treated water that has passed through the separation membrane while causing the air diffusion device to perform the air diffusion;
• and
• an inference section configured to:
• (i) use a regression model that uses, as an explanatory variable, the input data and uses, as an objective variable, transmembrane pressure-related data related to a transmembrane pressure of the separation membrane after a predetermined time associated with the input data, to infer the transmembrane pressure-related data after the predetermined time, and
• (ii) execute an updating process M times (where M is an integer of not less than 2) while changing a part of the input data, the updating process being a process of updating the input data N times (where N is an integer of not less than 2) by changing the transmembrane pressure-related data included in the input data to the inferred transmembrane pressure-related data, so as to execute an inference process of obtaining M inference results on changes over time in the transmembrane pressure in a period up to Nx the predetermined time.