Please use this identifier to cite or link to this item:
Title: Mixed- and plug-flow performances of an anaerobic biofilter treating 2-ethylhexanoic acid
Authors: Chua, H.
Yap, M.G.S. 
Ng, W.J. 
Keywords: 2-ethyl-hexanoic acid degradation
biofilter performance
branched-chain fatty acid
Mixed- and plug-flow anaerobic biofilter
tracer studies
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.
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
ISSN: 02732289
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Feb 28, 2018


checked on Oct 7, 2021

Page view(s)

checked on Sep 22, 2022

Google ScholarTM


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.