"We would purge clean with nitrogen, then water wash to a neutral pH on the discharge.
Our tech brochure and associated lit suggests bases as well "Treatment with calcium based alkalis (hydrated lime or calcium
carbonate) favors hydrolysis of the Boron Trifluoride and precipitation of CaF2 and Ca(BO2)2·6H2O, both of which may be recovered and disposed of as solids" (pg 13). The Armor article recommends carbonate as well."Hopefully they are helpful to you. Jie Hejie.email@example.com