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