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        Mining phosphorus from anaerobically treated dairy manure by forward osmosis membrane

        Biplob Kumar Pramanik,Faisal I. Hai,Ashley J. Ansari,Felicity A. Roddick 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-

        We investigated the effect of draw solution type on the forward osmosis (FO) performance for enrichingnutrients from anaerobically treated dairy manure (ATDM) followed by chemical precipitation forphosphorus recovery as struvite crystal. The FO membrane significantly rejected COD (>97%) andphosphate (>98%) whereas there was only 70%–73% and 73%–76% rejection of ammonia-nitrogen andtotal nitrogen, respectively. The draw solution type had little impact on the retention of theaforementioned wastewater constituents by the FO membrane. At 60% water recovery, a waterfluxdecline of 82%–96% was observed due to increasing contaminant concentration in the concentrated feedsolution. Waterflux decline was less for MgCl2 than EDTA-2Na and NaCl as draw solutes. On the contrary,the reverse soluteflux was higher for NaCl than MgCl2, which in turn was higher than EDTA-2Na. Preconcentrationof ATDM by FO facilitated struvite precipitation. MgCl2 as the draw solute provided ahigher purity of struvite than EDTA-2Na and NaCl. This is because when MgCl2 was used as the drawsolute, the reverse saltflux of magnesium to the concentrated ATDM provided favourable conditions forstruvite crystal formation. This study demonstrates the technical feasibility of phosphorus recovery fromATDM using the FO process.

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