Nothing Wasted

by Dennis A. Burke, P.E., (M.ASCE), Pres.; Cyclus EnviroSystems, Olympia, WA,

Serial Information: Civil Engineering—ASCE, 1998, Vol. 68, Issue 6, Pg. 62-64

Document Type: Feature article


Anoxic gas flotation (AGF), a patented system for anaerobic digestion of organic slurry waste, can recover as much as 85% of the phosphorus and 23% of the nitrogen in slurry waste, while also producing pipeline quality (980 BTU) natural gas. The AGF method uses dissolved methane gas flotation to thicken, concentrate and retain biomass within a digester, increasing the efficiency of the bacteria digesting the organic matter. The benefits of AGF include low capital and operating costs and the ability to recover nutrients for use in farming or commercial applications.

Subject Headings: Waste treatment | Sludge | Nutrient pollution | Natural gas | Dissolved gases | Slurry pipelines | Renewable energy

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