As the article stated:
There are undeniable benefits to this process. In
2011, a study from the University of Groningen compared conventional
burial, cremation, alkaline hydrolysis and cryomation and found that
alkaline hydrolysis had the lowest overall environmental footprint.
Regardless of how to decompose a body the heavy metals and so forth in our bodies will be the same.
I'll just accept what they say as fact.
You know, back in the day I was working a temporary gig through Manpower, Inc. where an environmental scientific monitoring company was doing a before and after of people located near a large sewage plant that was being built. They were concerned with cadmium. It was very interesting work. One night they needed volunteers to take little samples of human poop and put them into like test tubes. So, for $100 or was it just $50 I did that for an hour or so. I felt guilty for making so much money that I offered them some money back, but they wouldn't hear of it.
That was probably the best job I ever had in my whole life. 
