Reusing liquid manure as a possible source of drinking water for pigs

摘要

A number of experiments were conducted using treatmentmethods such as chemical settling, aeration, ozonation, slow-sand filtration, and reverse osmosis to treat liquid swine manure as a possible source of drinking water for pigs. Addition of alum, lime, and gypsum to the liquid swine manure did not result in a significant reduction in total suspended solids (TSS) compared to natural settling of solids (24h). Aeration, ozonation, and natural settling reduced total dissolved solids (TDS) levels. Aeration at two levels, 2.2 and 3 L/min, reduced TDS levels at a faster rate than ozone treatment (1.8 mg/L) and natural settling in 6-L liquid manure volumes. Aeration at a rate of 3 L/min reduced 83 % of TDS in 7 days to meet the recommended TDS level (3000mg/L) for swine drinking water. Aerated supernatant water was filtered using a slow sand filter and analyzed for chemical and biological drinking water parameters. Blending 20% fresh water with liquid treated by a slow sand filter after 7 days of aeration at 3 L/min provides a liquid that can be used as a possible source of drinking water for pigs.