Removal of gaseous dichloromethane using a solid–liquid partitioning bioreactor under gradual and stepped load increase

Jie Xu Ye, Jin Feng Qiu, Jing Chen, Dong Zhi Chen, Zhuo Wei Cheng, Shi Han Zhang, Jian Meng Chen

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
Pages (from-to)79-85
Number of pages7
JournalInternational Biodeterioration and Biodegradation
Volume133
DOIs
StatePublished - Sep 2018
Externally publishedYes

Keywords

  • Dichloromethane
  • Silicone rubber
  • Solid non-aqueous phase
  • Two-phase partitioning bioreactor
  • Waste gas

ASJC Scopus subject areas

  • Microbiology
  • Biomaterials
  • Waste Management and Disposal

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