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Title: Performance of upflow anaerobic biofilter process in pharmaceutical wastewater treatment
Authors: Chen, Y.F.
Ng, W.J. 
Yap, M.G.S. 
Issue Date: 1994
Citation: Chen, Y.F., Ng, W.J., Yap, M.G.S. (1994). Performance of upflow anaerobic biofilter process in pharmaceutical wastewater treatment. Resources, Conservation and Recycling 11 (1-4) : 83-91. ScholarBank@NUS Repository.
Abstract: Anaerobic processes have become increasingly important in the treatment of complex industrial wastewaters, which may not only have high concentrations of organics but may contain toxic, persistent/recalcitrant substances. The present paper reports an investigation into the start-up characteristics, feasibility and performance of the Upflow Anaerobic Biofilter Process (UABP) for treating a pharmaceutical effluent, which would be typical of such wastewaters, with an organic concentration of 20,000 mg L-1 COD and two branched-chain fatty acids believed to be persistent/recalcitrant, pivalic acid (PA) and 2-ethylhexanoic acid (2-EHA). In addition to these, there is a readily degradable component, acetic acid. The data from the start-up process beginning with biomass seeding to stable operation showed that the UABP could be satisfactorily started up in two months by using a multiple seeding protocol. Hydraulic Retention Time (HRT) was found to be an important key parameter which can improve the removal rates of all targeted substances. Tracking results derived over a year indicated that the process was able to achieve stable performance at 15 days HRT. Increasing the HRT to 20 days substantially improved removal rates of COD and 2-EHA to 93% and 100%, respectively. This longer HRT particularly improved the removal of pivalic acid from 15% to 90%. The biofilter was then able to maintain this good performance when HRT was subsequently decreased in steps to 1.2 days HRT which brought it towards failure. This investigation demonstrated that the UABP could treat pharmaceutical wastewater containing persistent organics effectively.
Source Title: Resources, Conservation and Recycling
ISSN: 09213449
DOI: 10.1016/0921-3449(94)90080-9
Appears in Collections:Staff Publications

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