Background

Methanol can be effectively removed from air by biofiltration (Shareefdeen et al., 1993; Babbitt et al., 2009 [1,2]). However, formaldehyde is one of the first metabolic intermediates in the consumption of methanol in methylotrophic microorganisms (Negruţa et al., 2010 [3]), and it can be released out of the cell constituting a secondary emission.

Results

The total removal of methanol was achieved up to input loads of 263 g m⁻³ h⁻¹ and the maximum elimination capacity of the system was obtained at an empty bed residence times of 90 s and reached 330 g m⁻³ h⁻¹ at an input methanol load of 414 g m⁻³ h⁻¹ and 80% of removal efficiency. Formaldehyde was detected inside the biofilter when the input methanol load was above 212 g m⁻³ h⁻¹. Biomass in the filter bed was able to degrade the formaldehyde generated, but with the increase of the methanol input load, the unconsumed formaldehyde was released outside the biofilter. The maximum concentration registered at the output of the system was 3.98 g m⁻³ when the methanol load was 672 g m⁻³ h⁻¹ in an empty bed residence times of 60 s.

Conclusions

Formaldehyde is produced inside a biofilter when methanol is treated in a biofiltration system inoculated with Pichia pastoris. Biomass present in the reactor is capable of degrading the formaldehyde generated as the concentration of methanol decreases. However, high methanol loads can lead to the generation and release of formaldehyde into the environment.

How to cite: Guerrero K, Arancibia A, Caceres M, et al. Release of formaldehyde during the biofiltration of methanol vapors in a peat biofilter inoculated with Pichia pastoris GS115. Electron J Biotechnol 2019;40. https://doi.org/10.1016/j.ejbt.2019.04.003.

中文翻译：

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在接种巴斯德毕赤酵母GS115的泥炭生物滤池中对甲醇蒸气进行生物滤池期间释放甲醛

背景

可以通过生物过滤有效地从空气中除去甲醇（Shareefdeen等，1993； Babbitt等，2009 [1,2]）。但是，甲醛是甲基营养型微生物消耗甲醇的第一个代谢中间产物之一（Negruţa等，2010 [3]），甲醛可以从细胞中释放出来，构成二次排放。

结果

达到输入负荷263 g m ^-3  h ^-1时，甲醇的总去除量达到最大，系统的最大清除能力在空床停留时间为90 s时达到，输入时达到330 g m ^-3  h ^-1 414 gm ^-3  h ^-1的甲醇负载量和80％的去除效率。当输入的甲醇负载量高于212 g m ^-3  h ^-1时，在生物过滤器内部检测到甲醛。滤床中的生物质能够降解生成的甲醛，但是随着甲醇输入量的增加，未消耗的甲醛被释放到生物滤池之外。当空载停留时间为60 s时，甲醇负荷为672 g m ^-3  h ^-1时，系统输出端记录的最大浓度为3.98 g m ^-3。

结论

当在接种巴斯德毕赤酵母的生物过滤系统中处理甲醇时，会在生物过滤器内部产生甲醛。随着甲醇浓度的降低，反应器中存在的生物质能够降解生成的甲醛。但是，高甲醇负载量可能导致甲醛的产生和释放到环境中。

举证方式： Guerrero K，Arancibia A，Caceres M等。在接种巴斯德毕赤酵母GS115的泥炭生物滤池中对甲醇蒸气进行生物滤池期间释放甲醛。电子生物技术杂志2019; 40。https://doi.org/10.1016/j.ejbt.2019.04.003。