Denitrification by thermophilic soil bacteria with ethanol as substrate in a USB reactor |
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Authors: | Carlos N Laurino Faustino Siñeriz |
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Institution: | (1) Planta Piloto de Procesos Industriales Microbiologicos (PROIMI), San Miguel de Tucuman, Argentina |
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Abstract: | Summary Thermophilic biological denitrification was studied in a laboratory-upflow sludge blanket reactor fed with ethanol as carbon and energy source. High denitrification efficiency (>98%) was obtained at an ethanol: nitrate ratio >2 and at a hydraulic retention time (HRT) of 5 hours. The performance of the system with respect to nitrate removal was very satisfactory (>95%), even at high nitrate (235 mg NO3-N/L) and hydraulic (3 hours HRT) loading rates applied.A stable sludge was formed by spherical granules 1 to 3 mm in diameter with a content of 25,8 g VS/L and were almost exclusively composed of bacteria belonging to the genus Bacillus. |
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