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Floating Solids on Top of Gravity Separator The gravity separators often incorporate weeping walls for the removal of liquid from the sedimentation chamber. The ability of the weeping wall to remove liquid waste depends on the periodic cleaning of the perforations to maintain flow. In many cases the gravity separators remove a significant amount of degradable organic material that could be utilized to produce gas. The COD test is a direct measure of the quantity of material that could be converted to methane gas. Recent tests have established that screen and gravity separators can remove 75% to 80 % of the COD present in the waste stream. In one test the dairy parlor COD was reduced from 31,000 mg/l to 8,600 mg/l in the effluent from the gravity separator. In another the flush water influent to a separator system was 10,900 mg/L while the effluent was 1,800 mg/L. While a significant portion of the organic carbon (COD) is retained with the separated solids, an equal percentage of the nitrogen and phosphorus is not. The separation process alters the carbon to nitrogen ratio of both the liquid and solids streams. © Environmental Energy Company 11 www.makingenergy.com 360-923-2000PDF Image | Dairy Waste Anaerobic Digestion Handbook Options for Recovering Beneficial Products From Dairy Manure
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