Amorphous silica waste from a geothermal central as an adsorption agent of heavy metal ions for the regeneration of industrial pre-treated wastewater

The use of the amorphous silica allows to eliminate monovalent and divalent metal ions; 61.19% of silver, 96.28% of Cadmium and up to 98% of zinc, copper, nickel and lead; present in a standard prepared sample solution and between 39.56% and 84.22% of nickel, copper and zinc in a pre - treated industrial sample, achieving a good effluent quality with optimal chemical-physical conditions for its use.