Exploring Forward Osmosis Systems for Recovery of Nutrients and Water
نویسنده
چکیده
Livestock wastewater contains a large amount of nutrients that are available for recovery. In this study, a proof of concept process based on Forward Osmosis (FO) was proposed and investigated for in-situ formation of struvite from digested swine wastewater. This FO system took advantage of a drawback reverse solute flux (RSF) and used the reversed-fluxed Mg for struvite precipitation, thereby accomplishing recovery of both water and nutrient. With 0.5 M MgCl2 as a draw solution, high purity struvite formed spontaneously in the feed solution and the water flux through the FO membrane reached 3.12 LMH. The precipitated struvite was characterized and exhibited a similar composition to that of commercial struvite. The FO system achieve > 50% water recovery, > 99% phosphate recovery (given sufficient magnesium supply), and > 93% ammonium nitrogen removal from the digested swine wastewater. The recovered products (both struvite and water) could potentially generate a value of 1.35 $ m−3. The results of this study have demonstrated the feasibility of nutrient recovery from livestock wastewater facilitated by FO treatment. Exploring Forward Osmosis Systems for Recovery of Nutrients and Water
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