Ammonium Removal from Leachate Using Chemical
Suprihatin*,1 and Fitriana Dewie Pannita1
1Department of Agro-Industrial Technology, Bogor Agricultural University, Indonesia
Leachate is formed by leaching process of the disposed wastes. Leachate usually contains quite high concentration of ammonium (NH4+) and phosphate (PO43-), which is able to disturb the environment. Ammonium and phosphate can be removed simultaneously by chemical precipitation with precipitant containing Mg2+. This process forms a precipitate called struvite (MgNH4PO4·6H2O) that has a fertilizing value. The objective of this study was to investigate the optimum molar ratio of NH4
+ : Mg2+ : PO4 3- which can be applied to eliminate NH4+ concentration in leachate. In this experiment, the mixing process used a jar test at 100 rpm for 15 minutes. Precipitation was done in 45 minutes after adjustingthe pH to 9. Results showed that the optimum NH4+, PO43-, and Mg2+ removals could be achieved by addition of MgCl2·6H2O and Na2HPO4·2H2O with a molar ratio of 1:1:1. The efficiency of NH4 +, PO43-, and Mg2+ removals with this molar ratio were 79.79%, 56.13%, and 72.72%, respectively. The efficiency of physical parameters such as total suspended solids (TSS), turbidity, and colour were 55%, 46.15%, and 46.76%, respectively. The struvite deposit is a potential source of nutrient for slow-released fertilizer that has an economical benefit. The technical and economic benefits of the process are analyzed in
this research work.
Keywords: Ammonium removal, leachate, precipitation, struvite, slow-released fertilizer
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