Journal
PHYSICS AND CHEMISTRY OF THE EARTH
Volume 67-69, Issue -, Pages 86-92Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pce.2013.10.008
Keywords
Northern Works Wastewater Treatment Plant; Volatile fatty acids; Propionic to acetic acid ratio; LLE; GC-MS
Ask authors/readers for more resources
The purpose of this study was to develop a liquid liquid extraction method for the analysis of volatile fatty acids collected at the elutriation units of Unit 3, 4 and 5 at Johannesburg Water-Northern Works Wastewater Treatment Plant. Liquid liquid extraction (LLE) method employing dichloromethane (DCM) and methyl-tert-butyl-ether (MTBE) as extracting solvents was used during the quantitative analysis of volatile fatty acids namely acetic, propionic, butyric, isobutyric, valeric, isovaleric and heptanoic acid. The detection of the extracts was by gas chromatography coupled to a mass spectrometer operating under electron ionization mode (GC El MS). The results showed that MTBE was a better extraction solvent than DCM as it gave much higher recoveries (>5 folds). On the other hand, the overall reactor performance for all the three units in the period when the samples were collected, which was measured by the ratio of propionic to acetic acid was good since the ratio o did not exceed 1.4 with the exception of the samples collected on the 3rd of October where the ratio exceeded 1.4 significantly. The concentration of acetic acid, another indicator for the reactor performance in all three units was way below 800 mg/L thus the digester balance was on par. (C) 2013 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available