Both the liquid and the bones could be converted to fertilizer – they are, at least, using KOH rather than NaOH. I would endorse that, whether the liquid was sprayed 'locally' or taken away to a bulk fertiliser processing facility. The bones would clearly be good calcium/phosphate fertiliser, presumably.
Which ever way, I would not want all that Potassium to be lost by draining down to the sea.
Edited By not done it yet on 22/05/2017 16:51:49