Acidification 1 Aluminium concentration 1 Aluminium sulphate 1 Aluminum sulfate 1 Chemical water treatment 1 Coagulation 1 Coagulation-flocculation process 1 Constant weight 1 Inductively coupled plasma 1 Inductively coupled plasma-optical emission spectrometry 1 Land fill 1 Nanostructured materials 1 Optical emission spectroscopy 1 Recovery 1 Residual sludge Sludge disposal 1 Spectrometry 1 Sulfur compounds 1 Sulfuric acid 1 Water treatment plants 1 Water treatment process 1 Water treatment sludge 1