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A study on aerobic biodegradation of oil and grease containing wastewater
Author : P. Sanghamitra *a, Debabrata Mazumder a and Somnath Mukherjee b
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ABSTRACT
Biological treatment of oily wastewater is troublesome owing to its complex nature on account of slowly biodegradable organic substances. Though aerobic biodegradation of oil and grease is substantially slow, but it can be improved by using well acclimatised biomass. In the present work, aerobic biodegradation of synthetic oily wastewater was studied by considering the removal of COD as well as oil and grease. The improvement in the biodegradation of aerobic biomass was observed during acclimation process which continued over a period of three months. During this period, synthetic dextrose as well as oil feed carrying adequate nitrogen and phosphorous source were added to the acclimation reactor. The quantity of synthetic oily wastewater was increased at the rate of 10 ml per batch run along with decrease at the rate of 10 ml in synthetic dextrose feed in a total feed of 100 ml volume in each batch run. The removal of COD was in the range of 64.4–85.4% and percentage removal of oil was observed to be between 54.6–80%. At dextrose to oil feed ratio of 10:90 and 60:40, the maximum degradation of oil and COD were observed respectively in the acclimation reactor. During addition of only synthetic oil feed with oil concentration more than 33.33 mg/L, inhibition was noticed which was overcome by addition of inorganic nutrients at a time interval of 48 h.
KEYWORD
Aerobic biodegradation, oily wastewater, acclimation process, oil removal, COD removal