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Enhanced Lipid Degradation in Upflow Anaerobic Sludge Blanket Reactor by Integration with Acidogenic Reactor

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This work was conducted to investigate the lipids inhibition and their degradation in dairy wastewater treatment. Two-phase system, composed of an acidogenic continuously stirred tank reactor (CSTR) and an upflow anaerobic sludge blanket (UASB) reactor was compared with a single phase system, conventional UASB reactor. The systems were operated up to organic loading rate of 8.09 g COD/L/d and lipid loading rate of 2.94 g COD/L/d. The two-phase systems showed higher COD removal (1.19 times), lipids removal (1.92 times) and CH4 production (1.42 times) than the single-phase system. Degradation of lipids and saturation of the double-bonded lipids in the CSTR led to the enhanced system performance. However, the CSTR performance decreased at the acidogenic HRT below 0.27 d owing to insufficient biomass retention. In serum bottle tests at different lipids concentration, high lipids concentration resulted in long lag-phase time for CH4 production. However, 69.5% of TCOD was eventually converted to CH4 within 50 days, even at the highest lipids concentration (6.1 g COD/L). It meant that the lipids inhibition was not bacteriocidal but reversible.
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Document Type: Research Article

Publication date: 2006-01-01

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