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Impact of salinity on the population dynamics of microorganisms in a membrane bioreactor treating produced water
- Kose Mutlu, Borte, Ozgun, Hale, Ersahin, Mustafa Evren, Kaya, Recep, Eliduzgun, Selvihan, Altinbas, Mahmut, Kinaci, Cumali, Koyuncu, Ismail
- The Science of the total environment 2019 v.646 pp. 1080-1089
- biomass, effluents, fouling, membrane bioreactors, microbial communities, microorganisms, nanofiltration, oils, population dynamics, reverse osmosis, salinity, wastewater, wells
- Biomass characteristics may change subject to a salinity increase when treating high strength wastewater. In this study, the impact of salinity in a membrane bioreactor (MBR) was investigated for the treatment of produced water (PW). MBR was operated as a pre-treatment prior to nanofiltration (NF) and reverse osmosis (RO). Mixed PW, that was originated from different oil, gas, and oil-gas wells, were subjected to pre-treatment for 146 days including three different operational phases: Low-salinity (~10 mS/cm), gradual increased salinity (10–40 mS/cm) and high salinity (~40 mS/cm). The results of this study showed that microorganisms could adapt using real wastewater and treat PW up to a certain level of the salinity. At high salinity levels of PW, the floc structure started to be disrupted and membrane fouling was accelerated. PCR-DGGE analysis confirmed the changes in microbial communities' composition in relation with high salinity. The results of the final treatment experiments presented that NF and RO treatment produced high-quality effluents that could be suitable for reuse.