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Energy generation by methanation of persistent wastes |
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| Authors: | Chua H Chen Y F Yap M G S Ng W J |
| Institution: | 1.Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong ;2.Department of Chemical Engineering, Kent Ridge, Singapore ;3.Bioprocess Technology Unit, Kent Ridge, Singapore ;4.Department of Civil Engineering, National University of Singapore, Kent Ridge, Singapore ; |
| Abstract: | A 15-L anaerobic fixed-film reactor (AFFR) was evaluated for treating a trade effluent containing inhibitory concentrations of persistent branched-chain fatty acids, namely 2-ethylhexanoic acid (2-EHA) and neopentanoic acid (NPA), at a total of 17,000 mg COD/L. The AFFR was packed with fire-expanded clay spheres, and start-up was accomplished in 60 d. The organic load was increased in steps from 1.1 to 8.5 g COD/L/d. Total COD, 2-EHA, and NPA removal efficiencies were maintained above 70, 98, and 75%, respectively. The reactor could recover from a shock load of 150% increase in organic load. Combined mechanisms of organic adsorption and biodegradation rendered the AFFR more stable with shock loads. Mathane gas produced from the process could be used for preheating the effluent. |
| Keywords: | Index Entries" target="_blank">Index Entries Anaerobic fixed-film reactor branched-chain fatty acid persistent organics methanation |
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