Erapan Fraksi Klei+kleinano Tuf Volkan Gunung Salak terhadap Fosfat dan Nitrat dalam Air Limbah Industri

Abstract

In the previous researches, it could be extracted from volcanic tuff of M. Salak clay (c, diameter <2 μm) and nanoclay (nc, diameter <200 nm) fractions with the dominant positive charge so that it could be used as an anionic flocculent. Sorption of phosphate (PO43-) and nitrate (NO3-) on cn was reported to be higher than those on c but their separation processes took a long time. This research aimed at to evaluate sorption of PO43- and NO3- in industrial wastewater (ww) on the combined clay+nanoclay (cnc) fractions of M. Salak volcanic tuff. From the 3rd and 4th layer of M. Salak volcanic tuff profile (tv), it was extracted 4.8428 mg cnc3/g tv (45.38% c and 54.62% nc) and 8.3125 mg cnc4/g tv (35.91% c and 64.09% nc). Maximum sorption of cnc3 and cnc4 were respectively 14.27 mg ww-P/g cnc3 and 26.60 mg ww-NO3-/g cnc3 and 6.78 mg ww-P/g cnc4 and 10.68 mg ww-NO3-/g cnc4. Maximum sorption of ww-P and -nitrate on cnc3 and cnc4 were lower than those of inorganic-P and -nitrate. Reduction in ww-P from 23.63 to 1.00 mg P/L as to comply with the quality standard of water class III according to the GOI Regulation No. 82/2001 required 2.776 g cnc3/L or 2.09 g cnc4/L. The same thing for nitrate could not be determined because ww-NO3- (30.85 mg/L) was already lower than its quality standard (88.57 mg NO3-/L).