Strategy for Adaptation of Indigenous Halophilic Consortium to Iranian Oilfield Produced Water
Volume Title: 1
1Chemical Engineering department, Amirkabir University of Technology, Tehran , Iran
2Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran
3Department of Microbiology, University of Tehran, Tehran, Iran
4Chemical Engineering department, Amirkabir University of Technology, Tehran, Iran
5Department of Ecology and Environmental Pollution Control, Research Institute of Petroleum Industry (RIPI), Tehran, Iran
Produced water (PW) is a complex mixture of various organic and inorganic chemicals, some of which are recalcitrant or toxic. In the present study, adaptation of an indigenous halophilic consortium previously enriched in PW supplemented with yeast extract to a sample of southern Iranian oilfield PW supplemented with nitrogen and phosphorous sources was investigated. Experiments were carried out at: 1) Erlenmeyer scale, 2) Sequencing batch reactor (SBR). Results of runs at Erlenmeyer scale pointed to the importance of gradual increase in the concentration of PW, and the supplemention of PW with organic carbon sources needed for microbial growth for successful adaptation. Runs in SBR led to significant enhancement in COD removal (49.5%±5.2) compared to Erlenmeyer runs (22.4%±4.5). Since the operation in SBR was discontinued due to biomass loss at the end of each cycle, Membrane SBR for maintaining the biomass inside the reactor and performing the biological treatment process at a larger scale was recommended.