While metal finishing is on my mind, does anybody know the legalities of annodising commercially?

Reason being I'm looking to annodise some small batches, and there's no local annodisers, so I'm looking at fairly high costs/lead times, so I'm looking at the costs of doing it myself.

I've tried googling, but everything I've found so far is for the opposite of the big pond, which seems to be for the vast majority of areas if you're dealing with small quantities, you can just pour the waste produce down the drain provided it's diluted enough!
I some how think our enviromental bods may have a different view on that, but I'm struggling to find an answer.

The only hits I've found for this side of the pond are for companies dealing with hazardous waste, who obviously have an interest in me paying for disposal. So has anybody got any knowledge of this area?