I've asked the following question on chemistry.SE:
It's had very little attention, and I'm wondering if it would have been better to ask it here - principally because perhaps the element of methods for disposal of waste strike me as an engineering domain problem, as it's a more practical issue? (Not that practical implies engineering).
Also, I suppose Eng.SE includes chemical engineering? Perhaps the sometimes blurry boundaries of SE sites as well as engineering disciplines mean the question could, or even should, have been asked here?