Anaerobic Treatment Of Phenol In A Two-stage
Anaerobic Reactor
Author(s)
J. E. Hernandez & R. G. Edyvean
Abstract
The inhibitory effects of phenol are problematic for the anaerobic treatment of
wastewater. The purpose of this study is to demonstrate that a two-stage
anaerobic digester (TSAD) can degrade phenol, reducing its toxic effects in the
first acidogenic reactor (R1) before going into a methanogenic reactor (R2). The
system consisted of two reactors in semi continuous operation. R1 was a
Continuous Stirred Tank Reactor at pH 5.5± 0.5; R2 was a packet reactor at pH
8.4± 0.05. Both were operated at a hydraulic retention time (HRT) of 10 days
and 35 0 C and fed with a nutritional supplement at organic loading rate (OLR) of
1.8 grams of COD per litre of reactor per day (LR -1 Day -1 ) until steady state
conditions. Then one gram of phenol was fed daily over a period of 15 days. The
performance of the system was monitored and analysed in terms of degradation
of phenol and dissolved chemical oxygen demand (DCOD); concentration of
organic acids (OA) and suspended organic carbon (SOC); biogas production and
pH evolution. The removal of phenol and DCOD peaked at 99.7% and 70%
respectively. The biogas production in the methanogenic reactor reached 0.8195
Lbiogas LR -1 Day -1 . These experiments demonstrate that, given the right conditions,
a TSAD can degrade phenol without considerable inhibition.
Keywords: Two-stage anaerobic digestion, phenol degradation, mesophilic,
acidogenesis, methanogenesis, cofermentation, inhibition.
1 Introduction
Aromatic compounds are very abundant in the environment [1]. Anaerobic
digestion can be affected by the presence of these compounds, which are highly
refractory and prejudicial to methanogenic reactions [2-7]. The anaerobic
Keywords
Two-stage anaerobic digestion, phenol degradation, mesophilic,
acidogenesis, methanogenesis, cofermentation, inhibition.
Related Book
Other papers in this volume
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