In the photovoltaic industry, nanofiltration membranes are mainly used in two major processes: ultrapure water preparation and cutting fluid recovery. Through reverse osmosis and nanofiltration technologies, ionic impurities in water can be efficiently removed, ensuring the quality of water used for silicon wafer cleaning. At the same time, waste cutting fluid generated during silicon wafer cutting can be effectively recovered, enabling the recycling of valuable materials such as silicon carbide and polyethylene glycol, significantly reducing production costs and environmental burden, and contributing to green manufacturing.