Properties of Alternative Fertilizer from Adsorption of N and P Nutrients in Wastewater by Smectite and Lignite Fly Ash
This research was aimed to prepare alternative fertilizer by nutrients adsorption process of smectite (SMT) and lignite fly ash (LFA) adsorbent in municipal and swine farm wastewater. SMT and LFA were a good adsorbent for ammonium and phosphate in aqueous solution respectively. Adsorption capacity of SMT and LFA at 5.12 mg.g-1 and 199.87 mg.g-1 were achieved respectively. Two types of fertilizer were produced, i.e. saturated ammonium SMT (FI) and saturated phosphate LFA (FII). The result of chemical properties of FI and FII reveals that total N were 1.28 and 0.12 % respectively, total P2O5 were 5.29 and 0.43 % respectively and organic matter content were 0.35 and 0.86 % respectively. When comparing with organic fertilizer standard, FI and FII gave the total N and total P2O5 over the standard. The releasing rate of ammonium from FI was 32.26 mg.L-1.min-1 and phosphate from FII with adding 0.5 M NaHCO3 solution was 7.73 mg.L-1.min-1. Therefore, these two fertilizers were slow releasing Nitrogen-based and Phosphorus-based fertilizers and appropriate used as alternative fertilizer for agriculture.
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