Absorption and Biodegradation of Toluene in a Two-Phase Low-Pressure Bioscrubber Using Cutting Oil as the Organic Phase

Nourmohammadi, Mohammad; Golbabaei, Farideh; Karimi, Ali; Pourmand, Mohammad Reza; Poor, Alireza Noor; Foroushani, Abbas Rahimi; Nourmohammadi, Esmaeil

doi:10.5812/jhealthscope.65219

Cited by 3 publications

(2 citation statements)

References 34 publications

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“…The results showed that the addition of the NAP strongly increased the amount of absorbed aromatic compounds, with the removal efficiency of hydrophobic compounds increasing from 12% to 36%. Similarly, the influence of the cutting oil addition on the absorption and the biodegradation of toluene was studied in a large-scale bioscrubber by Nourmohammadi et al [17]. 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].…”

Section: Introductionsupporting

confidence: 53%

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: 53%

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 liquid phase containing the target contaminant is then transferred to the bioreactor. The bioreactor unit contains a suspension of suitable microbial species and nutrients for the growth of microorganisms (12).…”

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

Nourmohammadi

Golbabaei

Karimi

et al. 2022

Preprint

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Toluene is a single-ring aromatic, which is widely used in various industrial processes. Regarding to harmful effects to human, the aim of this study was removal of toluene from the airflow using industrial-scale low-pressure two-phase bioscrubber with cutting oil. The design of the bioscrubber of the present study consisted of two parts of the adsorption column and a. Also, cutting oil was added at concentrations of 5%, 7.5% and 10% as organic phases and tested. The results show that after 72 hours with increasing organic phase concentration, toluene concentration was further decomposed compared to the control sample. The results showed that the use of 5% concentration of cutting oil increased the efficiency from 22% in the case of no organic phase to 55% in the case of using 5% of cutting oil. 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%. In this study, for the first time in Iran, cutting oil was used as an organic phase, which showed that cutting oil in concentrations less than 10% had no effect on the growth of microorganisms. The results showed that shear oil and silicone oil increased the adsorption of volatile organic compounds in bioscrubber.

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Absorption and Biodegradation of Toluene in a Two-Phase Low-Pressure Bioscrubber Using Cutting Oil as the Organic Phase

Cited by 3 publications

References 34 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

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

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