Sorry to hear about your accident, tough luck. It won't be possible to remove the bad sectors, but you can hide them with some software tools though this seems a bit pointless.
More important : It's possible that the HDD suffered more damage than some bad sectors and have become unreliable. I suggest you back up any vital data in it. After that, use it for some time, say a few weeks, and if no further ill effects show up, then it's probably OK.
Don't open the drive. Even minute dust particles settling on the platters can cause further damage.