It's a product of the yeast and happens normally. Other than giving a yeasty taste, there's nothing wrong with drinking it.
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Bottoms up!
Kevin Guske

So heres a tribute toast with root beer in hand to you and the many mugs of suds along your happy trails. --Charles Wysocki, artist and root beer fan, 1928-2002

Anonymous wrote:

As I meant to write above, I made root beer for the first time using an old recipe - sass, juniper, wintergreen, ginger, dandelion.

Sounds like a good recipe. Please, give the details.

Incidentally, sediment sometimes occurs in regular beer. When I visited my German relatives in 1956, they had beer periodically delivered to their home from a local brewery the way milk was delivered in the USA (When there were "Milk Men."). This beer came in returnable glass bottles with mechanical stoppers. Anyway, this beer always had a lot of sediment.