Obviously you can't work advance as how i explained it so safest thing you can do is just run new wires if you want to use 110v. For 220v just use the dryer wire, go get a 240v receptacle apply the 2 pre existing hot wire(red and black) ground to ground then your good to go, no need to change the breakers use that for lighting 1 1k lighting system will only take up 4.7amp so your fine with the 10awg wire and 30amp circuit breaker.
Btw there are not much appliances out there that uses up to 30amp and run on 110v either but we're talking about hydro equipment here, so you must be a idiot to use up 30amp on a single 110v receptacle obviously if you have done something like that you don't understand electricity.