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Membrane Filtration of Untreated vs. Anaerobically Digested Swine Manure

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2007 ASAE Annual Meeting  074047.(doi:10.13031/2013.23243)
Authors:   Ronald J Fleming, Malcolm (or initial) MacAlpine
Keywords:   Reverse osmosis, RO, separation, slurry, VSEP

The performance of a membrane filtration system, equipped with a reverse osmosis filter pack, was evaluated in an attempt to recover clean water from liquid swine manure. Untreated manure and anaerobically digested manure were both fed through the system under five different management options. The process was effective at removing nearly everything except a small amount of NH4 from the recovered water. When the liquid was processed in a single pass, the water recovery flow rates were higher for the anaerobically treated manure. This was not necessarily the case when multiple passes were used. In fact, the concept of multiple passes did not appear to be feasible. Recoveries of 50% and 75% of the water in the manure were tested. Pre-filtering of the manure and digestate were deemed necessary to reduce the particle sizes of solids in the influent materials.

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