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|Title:||Mixed- and plug-flow performances of an anaerobic biofilter treating 2-ethylhexanoic acid||Authors:||Chua, H.
|Keywords:||2-ethyl-hexanoic acid degradation
branched-chain fatty acid
Mixed- and plug-flow anaerobic biofilter
|Issue Date:||Mar-1992||Citation:||Chua, H., Yap, M.G.S., Ng, W.J. (1992-03). Mixed- and plug-flow performances of an anaerobic biofilter treating 2-ethylhexanoic acid. Applied Biochemistry and Biotechnology 34-35 (1) : 789-800. ScholarBank@NUS Repository. https://doi.org/10.1007/BF02920597||Abstract:||The performance of a 20-L anaerobic biofilter treating 2-ethyl-hexanoic acid (2-EHA) operating with the effluent recirculated was compared with that of the same biofilter operated without any recirculation. The recirculation of effluent was at a rate of 60 L/h through the biofilter. Tracer experiments were carried out to study the hydrodynamics in the biofilter under different modes of operation. The dispersion number (D/UL) obtained from these tracer experiments for the biofilter operated with and without effluent recirculation were 0.65 and 0.06, respectively. These values show that the recirculation was effective in achieving a mixed-flow pattern in the biofilter, whereas the biofilter operated without recirculation was essentially a plug-flow column with a moderate level of axial dispersion. The feed consisted of 2-EHA at a concentration of 8200 mg/L, which is equivalent to a COD of 20,000 mg/L. The optimal performance of the mixed-flow biofilter was at a hydraulic retention time (HRT) of 1.1 d, with a COD removal efficiency of 92.8% and a biogas production rate of 6.44 L/L biofilter vol/d. The biofilter failed at 0.83 d HRT, as a result of washout of biomass at this high hydraulic loading rate. By comparison, the optimal performance achieved for the plug-flow system was at 2 d HRT. The COD removal efficiency was 74.1%, and biogas production rate was 2.13 L/L biofilter vol/d. When the HRT was lowered to 1.5 d, failure occurred owing to inhibition as indicated by the low methane yield of 0.192 L/g COD removed. The superior performance of the mixed-flow mode can be attributed to the presence of the recycle stream, which diluted and evenly distributed the feed. © 1992 Humana Press Inc.||Source Title:||Applied Biochemistry and Biotechnology||URI:||http://scholarbank.nus.edu.sg/handle/10635/91566||ISSN:||02732289||DOI:||10.1007/BF02920597|
|Appears in Collections:||Staff Publications|
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