Use of respirometer in evaluation of process and toxicity of thermophilic anaerobic digestion for treating kitchen waste |
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Authors: | Kuo Wen-Chien Cheng Kae-Yiin |
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Institution: | Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, 1 Hseuh Fu Road, Nei Pu, Pingtung 91207, Taiwan. xwck@mail.npust.edu.tw |
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Abstract: | A thermophilic anaerobic digestion (TAnD, 55 degrees C) system was adopted to hydrolyze the kitchen waste for 3 days, which was then fermented for a hydraulic retention time (HRT) of 10 days. The TAnD system performed much better than a similar system without thermal pre-treatment. A bubble respirometer was employed to study the effects of thermal pre-treatment, which showed that pre-treatment at 60 degrees C yielded the highest Total COD (TCOD) removal efficiency (79.2%) after 300h reaction. Respirometer results also indicated that oil and grease (O and G) began to inhibit the TAnD system at a concentration of approximately 1000mg/L and the gas production was inhibited by 50% at a concentration of approximately 7500mg/L of sodium. |
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