I worked at a daycare and honestly, it's really annoying how little we were allowed to do to prevent things like biting. We were supposed to "redirect" the child, but they were never given any real discipline. I don't think redirection does anything at all. It doesn't teach the child that biting is wrong, it doesn't prevent it from happening again, and I think it even kind of shows the child that nothing will happen so he can keep doing it. Daycares are kind of fearful of lawsuits, since so many people are sue-happy these days. Of course, each daycare may be different, but that was my experience when I worked at one.
I'd definitely talk to the director, he/she is the only one who can really do anything. The teachers in the rooms have rules and laws, set by the state, that they have to follow, but the director might be able to talk to the biter's parents or provide another solution for you.