An innovative nutritional slow-release packing material with functional microorganisms for biofiltration: Characterization and performance evaluation

Zhuowei Cheng, Ke Feng, Danhua Xu, Christian Kennes, Jianmeng Chen, Dongzhi Chen, Shihan Zhang, Jiexu Ye, Dionysios D. Dionysiou

Research output: Contribution to journalArticlepeer-review

Abstract

The type of packing material for biofiltration has a great impact on microbial growth and pollutant removal. This study evaluated the feasibility of a nutritional slow-release packing material with functional microorganisms (NSRP-FM) in a biofilter for the removal of gaseous n-butyl acetate. Through the emulsification-cross linked process and microbial immobilization, an innovative packing material was obtained, with a specific surface area of 2.45 m2 g−1 and a bulk density of 40.75 kg m-3. The cumulative release rates of total phosphorus and total nitrogen were 90.6% and 75.6%, respectively, as measured while continuously spraying deionized water. To evaluate the performance of biofiltration, NSRP-FM was compared with the commercial polyurethane foam (PU-foam), in two identical biotrickling filters (BTFs). The BTF packed with the prepared NSRP-FM maintained a consistent removal efficiency (over 95%) without nutrients addition and pH adjustment. The other BTF had poor removal performance, and the removal efficiency declined to 65% when there was no pH adjustment. Energy dispersive X-ray spectroscopy (EDS) analysis of NSRP-FM showed that inorganic elements were released during the operation of BTF. The abundance of functional microorganisms suggested that the prepared NSRP-FM provided a better environment for microbial growth, despite changes in the operating conditions.

Original languageEnglish (US)
Pages (from-to)16-26
Number of pages11
JournalJournal of Hazardous Materials
Volume366
DOIs
StatePublished - Mar 15 2019

Keywords

  • Biotrickling filter
  • Function microorganisms
  • Nutritional slow-release
  • Removal performance
  • pH buffer

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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