Continuous bioreactor with cell recycle using tubular ceramic membrane for simultaneous wastewater treatment and bio-oil production by oleaginous Rhodococcus opacus

Paul, Tanushree; Baskaran, Divya; Pakshirajan, Kannan; Pugazhenthi, G.

doi:10.1016/j.cej.2019.02.050

Cited by 28 publications

(14 citation statements)

References 29 publications

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“…Raw refinery wastewater was collected from a refinery plant and characterized as follows: 4500 mg L −1 COD, pH 10.5, 1253 mg L −1 total dissolved solids (TDS), and 558 mg L −1 total suspended solids (TSS) 14, 15.…”

Section: Methodsmentioning

confidence: 99%

“…R. opacus PD630 is known to degrade toxic phenolics and recalcitrant compounds present in refinery wastewater 14, 15, 27. Seed cultures of the oleaginous hydrocarbonoclastic bacterium R. opacus were prepared from Nutrient Broth (NB) agar slants (1.8 % (w/v)) and subcultured regularly by growing in 250‐mL Erlenmeyer flasks containing liquid medium for 48 h at 30 °C and 120 rpm.…”

Section: Methodsmentioning

confidence: 99%

“…Rhodococcus species also produce surfactants, polymers, flocculants, and various pigments. Rhodococcus opacus is known to degrade complex polycyclic aromatic hydrocarbons (PAH) in refinery wastewater as well as in dairy and paper-and-pulp wastewater treatment [12][13][14][15]. However, an integrated approach involving the bacterium in a membrane bioreactor setup has not been reported thus far.…”

Section: Introductionmentioning

confidence: 99%

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Reuse Potential of Refinery Wastewater Treated Using a Two‐Stage Submerged Membrane Bioreactor

et al. 2022

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Refinery wastewater treatment was performed using a novel submerged tubular ceramic membrane bioreactor (STMBR) with the oleaginous hydrocarbonoclastic bacterium Rhodococcus opacus. A membrane‐based flux study with the STMBR was carried out to assess the performance of the tubular ceramic membrane. Continuous experiments with the STMBR achieved a maximum chemical oxygen demand (COD) removal of 84 %, with an average flux of 0.4 × 10−3 m3m−2s−1. To further enhance the COD removal efficiency, two STMBR were operated under the optimum conditions. Complete COD removal along with 2.98 g L−1 biomass growth was achieved during two‐stage STMBR operation. Furthermore, a toxicity assessment of the permeate water established its reuse potential.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reuse Potential of Refinery Wastewater Treated Using a Two‐Stage Submerged Membrane Bioreactor

et al. 2022

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“…They applied different strategies for cell cultivation, including batch, fed-batch, sequential batch, continuous, and continuous with cell recycling using a low-cost tubular ceramic membrane ( Table 2 ). The authors concluded that R. opacus serves as a good source of oils during wastewater treatment, with excellent biofuel properties [ 86 ]. Similarly, Kumar et al reported the production of SCO by R. opacus with good potential for the biodiesel industry using raw dairy wastewater as a carbon source for cell cultivation.…”

Section: Conversion Of Industrial Wastes Into Microbial Oils By Rhodococcimentioning

confidence: 99%

Rhodococcus as Biofactories for Microbial Oil Production

et al. 2021

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Bacteria belonging to the Rhodococcus genus are frequent components of microbial communities in diverse natural environments. Some rhodococcal species exhibit the outstanding ability to produce significant amounts of triacylglycerols (TAG) (>20% of cellular dry weight) in the presence of an excess of the carbon source and limitation of the nitrogen source. For this reason, they can be considered as oleaginous microorganisms. As occurs as well in eukaryotic single-cell oil (SCO) producers, these bacteria possess specific physiological properties and molecular mechanisms that differentiate them from other microorganisms unable to synthesize TAG. In this review, we summarized several of the well-characterized molecular mechanisms that enable oleaginous rhodococci to produce significant amounts of SCO. Furthermore, we highlighted the ability of these microorganisms to degrade a wide range of carbon sources coupled to lipogenesis. The qualitative and quantitative oil production by rhodococci from diverse industrial wastes has also been included. Finally, we summarized the genetic and metabolic approaches applied to oleaginous rhodococci to improve SCO production. This review provides a comprehensive and integrating vision on the potential of oleaginous rhodococci to be considered as microbial biofactories for microbial oil production.

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“…Raw refinery wastewater was also utilized by the same oleaginous bacterium for converting it into bio-oil via hydrothermal liquefaction of the lipid-rich biomass produced during the treatment process. Among the different strategies, the continuous cell recycle system proved efficient in terms of complete removal of COD (99%) and high lipid production (86%) at a hydraulic retention time of 16 h (dilution rate of 0.06 h −1 ) (Paul et al, 2019). In summary, according to Hall et al (2011) and Huang et al (2017), a total of nine oleaginous yeasts and one oleaginous bacterium have been used to treat municipal wastewater so far.…”

Section: Oleaginous Microorganisms Used For Biological Wastewater Treatmentmentioning

confidence: 99%

Environmental aspects of biological wastewater treatment by different methods and microorganisms

Vijatov¹,

Drazic²,

Jovanović³

2020

Sustain Forestry

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The biological treatment of wastewaters (municipal and industrial) is an important topic in the field of biochemistry and biotechnology, as well as in the field of environmental engineering. It has many advantages, such as the simple operation of the basic bioreactor, the potential for the production of valuable bioproducts and efficient wastewater treatment in a short time. However, the biological wastewater treatment also has certain downsides, such as air pollution in places which are near bio-lagoons, and endangering the health of personnel involved in this process. By studying and analyzing data from the reference literature, this paper provides a comprehensive overview of information on microorganisms involved in the wastewater treatment process, the factors with a negative effect on their development, as well as the negative effects of these microorganisms and the biological wastewater treatment process on the environment.

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Continuous bioreactor with cell recycle using tubular ceramic membrane for simultaneous wastewater treatment and bio-oil production by oleaginous Rhodococcus opacus

Cited by 28 publications

References 29 publications

Reuse Potential of Refinery Wastewater Treated Using a Two‐Stage Submerged Membrane Bioreactor

Reuse Potential of Refinery Wastewater Treated Using a Two‐Stage Submerged Membrane Bioreactor

Rhodococcus as Biofactories for Microbial Oil Production

Environmental aspects of biological wastewater treatment by different methods and microorganisms

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