Removal of gaseous dichloromethane using a solid–liquid partitioning bioreactor under gradual and stepped load increase
| Autor: | Zhuo Wei Cheng, Shihan Zhang, Jie Xu Ye, Jianmeng Chen, Jing Chen, Jin Feng Qiu, Dong Zhi Chen |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Pollutant 010501 environmental sciences Silicone rubber 01 natural sciences Microbiology Biomaterials chemistry.chemical_compound chemistry Chemical engineering 010608 biotechnology Phase (matter) Mass transfer Bioreactor Waste Management and Disposal Solid liquid 0105 earth and related environmental sciences Dehalogenase Dichloromethane |
| Zdroj: | International Biodeterioration & Biodegradation. 133:79-85 |
| ISSN: | 0964-8305 |
| DOI: | 10.1016/j.ibiod.2018.06.013 |
| Popis: | Silicone rubber was used as the solid non-aqueous phase of two-phase partitioning bioreactor (TPPB) for dichloromethane (DCM) removal. When the load gradually increased from 150 g m−3 h−1–485 g m−3 h−1 by increasing the gaseous DCM concentration, a steady elimination capacity (EC) of approximately 130 g m−3 h−1 was achieved in one-liquid-phase completely mixed stirred tank bioreactor (CSTB), whereas the EC of TPPB was enhanced from 155 g m−3 h−1–366 g m−3 h−1. This result indicated that DCM removal was controlled by the biological process in CSTB and by mass transfer in TPPB. Meanwhile, the biomass decreased from 534 mg l−1 to 381 mg l−1 in CSTB compared with that maintained at around 580 mg l−1 in TPPB due to the different resistance capabilities to DCM toxicity. Dehalogenase activity was maintained at a relatively high level under high DCM stress with the addition of silicon rubber. TPPB was shown to be more dependable in the overload from 120 g m−3 h−1–450 g m−3 h−1. This paper is the first to report that the crucial step in high-load pollutant removal can be converted from the biological process to mass transfer by adding solid non-aqueous phase. |
| Databáze: | OpenAIRE |
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