Adsorption and Desorption of Ammonium and Orthophosphate by Rice Straw and Rice Husk for Soil Amendment
Keywords:
Adsorption, Ammonium, OrthophosphateAbstract
This research investigates the feasibility of using rice straw (RS), rice husk (RH), rice straw biochar (RSB), and rice husk biochar (RHB) for adsorption of ammonium and orthophosphate from aqueous solution. In batch experiment effect of adsorption variables such as pH, contact time and adsorption dosage were investigated. The optimum conditions of 4 types of bio-adsorbent for ammonium adsorption were pH 5, contact time 2H and adsorbent dose 7 g/L. While only RH and RHB adsorbed orthophosphate at pH 5, contact time 6H and adsorbent dose 7 g/L. Pseudo second order model best described the adsorption which agree with the chemisorption as the rate controlling mechanism. Addition, it was found that ammonium and phosphate were desorbed. Therefore, this research showed that RS, RH, RSB and RHB after ammonium or phosphate adsorption could be used as enrichment with N or P nutrient soil amendment in order to reduce using a chemical fertilizer.
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