Coupled with ethanol requires energy in the reigns of distilled, highly concentrated. So there is no concept of thermal and renewable energy from the sun radiation used in various low temperature sterilization.
The ethanol would be used in refining a highly concentrated as well. The concept of bringing heat from renewable energy from solar radiation is used to sterilize at low temperatures.
Along with ethanol is to use power in refined to have higher concentration as well. The concept of heat conduction from the renewable energy from solar radiation used in disinfection of various low temperature.