Impact of salinity on the population dynamics of microorganisms in a membrane bioreactor treating produced water


Köse Mutlu B. , Özgün Erşahin H. , Erşahin M. E. , Kaya R. , Eliduzgun S., Altınbaş M. , ...More

SCIENCE OF THE TOTAL ENVIRONMENT, vol.646, pp.1080-1089, 2019 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 646
  • Publication Date: 2019
  • Doi Number: 10.1016/j.scitotenv.2018.07.386
  • Title of Journal : SCIENCE OF THE TOTAL ENVIRONMENT
  • Page Numbers: pp.1080-1089
  • Keywords: Membrane bioreactor, Microbial community, Nanofiltration, Produced water, Reverse osmosis, Salinity, SEQUENCING BATCH REACTOR, WASTE-WATER, FRACTURING FLOWBACK, BIOMASS ACTIVITY, SP-NOV, OIL, PERFORMANCE, PCR, BIAS, HYDROCARBONS

Abstract

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 (similar to 10 mS/cm), gradual increased salinity (10-40 mS/cm) and high salinity (similar to 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. (C) 2018 Published by Elsevier B.V.