Simulation of in-situ bioremediation of phenol contaminated sandy aquifers. 2. Effect of phenol concentration

Sand from Safwa was sieved and 3 sets of columns prepared containing sand of particle size, 0.2 (F), 0.3 (M), and 0.4 (C) mm. Columns were inoculated with raw sewage and purged with oxygen to give a concentration of 26 mg oxygen per litre and then concentrations of 15, 50 or 100 mg phenol per litre...

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Published in:Water, air, and soil pollution air, and soil pollution, 1996, Vol.87 (1/4), p.283-295
Main Authors: Farooq, S, Nakhla, G.F, Essa, M.H
Format: Article
Language:English
Subjects:
anaerobes
Applied sciences
Aquifers
bacteria
Biodegradation
biofilm
Biofilms
Biomass
bioreactors
bioremediation
Composition effects
Decontamination. Miscellaneous
Density (specific gravity)
Exact sciences and technology
groundwater contamination
Groundwater pollution
Hydraulic conductivity
particle size
phenol
Phenols
Pollution
porosity
Sand
saturated hydraulic conductivity
simulation
Soil and sediments pollution
Substrates
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Summary:Sand from Safwa was sieved and 3 sets of columns prepared containing sand of particle size, 0.2 (F), 0.3 (M), and 0.4 (C) mm. Columns were inoculated with raw sewage and purged with oxygen to give a concentration of 26 mg oxygen per litre and then concentrations of 15, 50 or 100 mg phenol per litre were introduced. Eluate from the columns was analysed for phenol, dissolved oxygen, pH and hydraulic conductivity. Hydraulic conductivity decreased by 72, 82 and 86 per cent for F, M and C sand at 65 mg phenol per litre; 94 and 96 per cent for C and M sand at 50 mg phenol per litre and 96 and 98 per cent for M and F sand at 100 mg phenol per litre. Phenol removal efficiency was 88 to 94 per cent and dependent on influent concentration and sand size. An anaerobic biofilm developed at 50 and 100 mg phenol per litre and reduced hydraulic conductivity in all sands because of gaseous biodegradation end products. Hydraulic conductivity correlated with biomass density at 10 and 100 mg phenol per litre. (see also preceding abstract).
ISSN:0049-6979
1573-2932
DOI:10.1007/BF00696842