Biodegradation of toluene in a two-phase low-pressure bioscrubber with using silicon oil as organic phase

Nourmohammadi, Mohammad; Karimi, Ali; Golbabaei, Farideh; Pourmand, Mohammad Reza; Foroushanid, Abbas Rahimi; Nourmohammadi, Esmaeil

doi:10.1080/03067319.2021.1921763

Cited by 5 publications

(2 citation statements)

References 24 publications

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“…The biocompatibility of the cutting oil and its ability to enhance the absorption and the biodegradation of toluene confirmed the results reported in Lalanne et al [16]. Recently, Nourmohammadi et al [18] replaced the cutting oil with silicone oil to assess the absorption and the biodegradation of toluene. The results confirmed the literature data demonstrating the positive influence of the silicone oil for the removal of hydrophobic VOCs such as toluene.…”

Section: Introductionsupporting

confidence: 78%

Removal of a Mixture of Seven Volatile Organic Compounds (VOCs) Using an Industrial Pilot-Scale Process Combining Absorption in Silicone Oil and Biological Regeneration in a Two-Phase Partitioning Bioreactor (TPPB)

et al. 2022

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The treatment of a synthetic polluted gas containing seven volatile organic compounds (VOCs) was studied using a pilot plant in real industrial conditions. The process combined VOC absorption in silicone oil (PolyDiMethylSiloxane, i.e., PDMS), a biological regeneration of the PDMS in a two-phase partitioning bioreactor (TPPB), and a phase separation including settling and centrifugation. The TPPB was operated at a water/PDMS volume ratio of 75/25. The VOCs treatment performance was efficient during the entire test, corresponding to 10 PDMS regeneration cycles. The analysis of the content of the aqueous phase and PDMS confirmed that VOCs are progressively degraded until mineralization. The nitrogen consumption and the characterization of the microorganisms highlighted possible anoxic functioning of the biomass within the first decanter. Moreover, although the absorption and biodegradation performances were very satisfactory, the separation of all phases, essential for the PDMS recycling, was problematic due to the production of biosurfactants by the microorganisms, leading to the formation of a stable emulsion and foaming episodes. As a consequence, the packed column showed slight fouling. However, no significant increase in the pressure drop of the packed bed, as well as no significant impact on VOC absorption efficiency was observed.

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Section: Introductionsupporting

confidence: 78%

Removal of a Mixture of Seven Volatile Organic Compounds (VOCs) Using an Industrial Pilot-Scale Process Combining Absorption in Silicone Oil and Biological Regeneration in a Two-Phase Partitioning Bioreactor (TPPB)

et al. 2022

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“…After the expansion of the use of biodegradation, several equipment was built based on it. Bio lters and bioreactors can be mentioned among the air puri cation equipment based on microorganisms (11). One of the most important bioreactors of air puri cation is bioscrubber which consists of two parts, the absorption part and the bioreactor.…”

Section: Introductionmentioning

confidence: 99%

Removal of toluene from Air- scream using semi industrial two-phase bioscrubber with cutting oil: An intervention study

2024

Global NEST Journal

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<p>Toluene is a monocyclic aromatic compound that finds widespread use in various industrial processes. Due to its harmful effects on human health and environment, this study aimed to remove toluene from the air stream using a two-phase bioscrubber. The bioscrubber design consisted of an absorption column that separated contaminants from the gaseous phase to the aqueous phase and a bioreactor for the biodegradation of toluene by microorganisms. Organic phases of cutting oil were added at concentrations of 5%, 7.5%, and 10%. The biodegradability test results revealed that 98% of the toluene concentration was further biodegraded after 72 hours compared to the control sample. The results showed that the use of 5% concentration of cutting oil increased the efficiency from 22% to 55%, At a concentration of 7.5%, the lowest efficiency was 38% and the highest was 63%. Also, the minimum and maximum removal capacity are 17 and 269 g/m3.h, respectively. Efficiency at a concentration level of 5% of cutting oil as an organic phase is better than a concentration of 7.5%. These findings indicate that the efficacy of the bioscrubber is better when using a 5% concentration of cutting oil as an organic phase. Moreover, this study is the first to use cutting oil as an organic phase in Iran, which showed that using cutting oil in concentrations less than 10% had no adverse effects on microorganisms' growth.</p>

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Volatile Methyl Siloxanes as Key Biogas Pollutants: Occurrence, Impacts and Treatment Technologies

et al. 2022

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Biodegradation of toluene in a two-phase low-pressure bioscrubber with using silicon oil as organic phase

Cited by 5 publications

References 24 publications

Removal of a Mixture of Seven Volatile Organic Compounds (VOCs) Using an Industrial Pilot-Scale Process Combining Absorption in Silicone Oil and Biological Regeneration in a Two-Phase Partitioning Bioreactor (TPPB)

Removal of a Mixture of Seven Volatile Organic Compounds (VOCs) Using an Industrial Pilot-Scale Process Combining Absorption in Silicone Oil and Biological Regeneration in a Two-Phase Partitioning Bioreactor (TPPB)

Removal of toluene from Air- scream using semi industrial two-phase bioscrubber with cutting oil: An intervention study

Volatile Methyl Siloxanes as Key Biogas Pollutants: Occurrence, Impacts and Treatment Technologies

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