Pasteurisation of milk today is done using steam generated by burning a fossil fuel or using electricity.The following diagram depicts the entire process of milk processing:
As can be seen from the above process diagram, milk processing involves two process that require heat:
Both processes do not require more than 90 deg C temperature. This can be provided by Solar Concentrators.
Diaries are ideal for implementation of Solar Thermal Systems as they do not have constraints of space for solar concentrators.