Dilute it with seawater, I mean. Even it's not safe to discharge concentrated brine with, say, 10x the normal salt concentration, maybe seawater with 1.1x the usual concentration (or whatever it is) would be okay.
In some me places it is hard to discharge even 1.1x brine. In the future it might be necessary to concentrate it all the way to solid salt crystals and then truck them away.