Biological treatment of organic compounds in produced water with use of halotolerant bacteria. Issue 6 (December 2020)

• Record Type: Journal Article
• Authors: Ojagh, Seyed Mohammad Amin; Fallah, Narges; Nasernejad, Bahram
• Is Part Of: Journal of environmental chemical engineering. Volume 8:Issue 6(2020)
• Publication Date: 2020-12
• Subjects: PW oilfield produced water -- BTEX benzene toluene, ethylbenzene, xylene -- PAH polycyclic aromatic hydrocarbon -- COD chemical oxygen demand -- TOC total organic carbon -- TDS total dissolved solids -- OD optical density -- TPH total petroleum hydrocarbon -- GC-MS Gas chromatography–mass spectrometry; Oilfield produced Water (PW) -- Rhodococcus erythropolis PTCC 1767 -- Adaptation -- NaCl; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2020.104412
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: Highlights: Biological treatment of PW by R. erythropolis occurred at 0-60 g/L salinity. Stepwise adaptation strategy raised COD removal of PW and shortened treatment time. After two days, synthetic and real PW, showed maximum COD removals of 97% and 52 GC-MS analysis proved 93% of TPH removal from synthetic PW by R. erythropolis. Abstract: Oilfield produced water (PW) is a mixture of different organic and inorganic compounds. The effects of discharging PW into the environment have lately become a major issue of environmental concern. This study aims to consider the capability of a gram-positive bacterium named Rhodococcus erythropolis PTCC 1767 in biological treatment of synthetic and real PWs. A stepwise adaptation strategy was applied for acclimation of the microorganism, by increasing chemical oxygen demand (COD) of the synthetic PW. The maximum COD removal efficiency was observed at 97% in PW with 600 mg/L COD. Also, by raising concentration of NaCl (up to 60 g/L), the stepwise adaptation strategy was performed for acclimated bacteria. The maximum COD removal efficiency occurred in the presence of 25 g/L NaCl. The results of total organic carbon (TOC) analysis revealed a removal efficiency of 85% and GC-MS analysis indicated a removal of 93% hydrocarbons (C14 -C26 ). The adapted cells were then applied for treating the real PW in which a COD removal efficiency of 52% was achieved.