Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/65817
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
URI: http://scholarbank.nus.edu.sg/handle/10635/65817
ISSN: 02732289
Appears in Collections:Staff Publications

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

SCOPUSTM   
Citations

12
checked on Feb 28, 2018

WEB OF SCIENCETM
Citations

9
checked on May 1, 2018

Page view(s)

37
checked on Jun 1, 2018

Google ScholarTM

Check


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