Bromine itself is very toxic, but it all depends on the dose and form (it's used as an anti-algae agent). The article doesn't mention the concentration or if it remains in the end product. I'm not a chemist though, most of my knowledge comes from nilered.
I’m a chemist. Bromine isn’t bromide, and lithium bromide is a simple nontoxic salt. If this is as simple as is described in the news article, then it’s likely a pretty “green” process overall.
