Search

A laboratory-scale biotrickling filter combined with a magnetic field (MF-BTF) and a single BTF (S-BTF) were set up to treat trichloroethylene (TCE) gas. The influences of phenol alone and NaAc-phenol as co-substrates and different MF intensities were investigated. At low MF intensity, MF-BTF displayed better performance with 0.20 g/L of phenol, 53.6–337.1 mg/m 3 of TCE, and empty bed residence times of 202.5 s. The performances followed the order MF-BTF (60.0 mT) > MF-BTF (30.0 mT) > S-BTF (0 mT) > MF-BTF (130.0 mT), and the removal efficiencies (REs) and maximum elimination capacities (ECs) corresponded to: 92.2%–45.5%, 2656.8 mg/m 3 h; 89.8%–37.2%, 2169.1 mg/m 3 h; 89.8%–29.8%, 1967.7 mg/m 3 h; 76.0%–20.8%, 1697.1 mg/m 3 h, respectively. High-throughput sequencing indicated that the bacterial diversity was lower, whereas the relative abundances of Acinetobacter , Chryseobacterium , and Acidovorax were higher in MF-BTF. Results confirmed that a proper MF could improve TCE removal performance in BTF. [ABSTRACT FROM AUTHOR]

Methyl acrylate is a widely used raw chemical materials and it is toxic in humans. In order to treat the methyl acrylate waste gas, a 3-layer BTF packed with ceramic particles and immobilized with activated sludge was set up. The BTF exhibited excellent removal efficiency that no methyl acrylate could be detected when EBRT was larger than 266 s and inlet concentration was lower than 0.19 g/m 3 . The 1st layer performed the best at fixed inlet concentration of 0.42 g/m 3 . PCR combined with DGGE was performed to detect the differences in different layers of the BTF. Phylum Proteobacteria (e.g. α-, β-, γ-, δ-) was predominantly represented in the bacterial community, followed by Actinobacteria and Firmicutes . Desulfovibrio gigas , Variovorax paradoxus , Dokdonella koreensis , Pseudoxanthomonas suwonensis , Azorhizobium caulinodans , Hyphomicrobium denitrificans , Hyphomicrobium sp. and Comamonas testosteroni formed the bacteria community to treat methyl acrylate waste gas in the BTF. [ABSTRACT FROM AUTHOR]