How to power 83V UV-C germicide tube?
The UV-C germicidal lamp is identical to a standard fluorescent lamp ...the only difference being the lack of a phosphor to convert the UV to white light.
See this.
The link above also shows an electronic ballast (though no real design details. You should be able to use any appropriate ballast for a T8 florescent lamp of the same power.

You can get single, dual and quad ballasts, but it's preferable to go for those that support the heaters for quick and even starts ....this is an example. 

For the secondary part of your question ...YES ...the lamps need to be driven by AC. While you could build a driver that worked on DC input (say 12-24V) you need to drive the lamp with an AC signal.

For the third part of your question, the 83V is the 'on' voltage of the tube. The driver ensure that there is a higher voltage available to 'strike' the tube on each AC half cycle. While in many applications the AC freq is 50/60Hz, you can drive these lamps up to several kHz.