In the AMAK process, the aim of the treatment with mineral
acidswas to transform macro- and micro fertilizer components into
forms that are bioavailable to plants. The mineral acids accomplished
this by binding volatile organic and inorganic nitrogen
compounds and by hydrolyzing organic matter. Moreover, by
adding the acids in one stage and the lime milk (10% solution) to
alkalize the manure slurry in a different stage of the treatment
process, we eliminated pathogens (bacteria and parasite eggs). The
addition of a superphosphate balanced the N and P contents in the
sediment and increased the calcium phosphate content in the
slurry