Abstract
The biotrickling filter (BTF) treatment is an effective way of dealing with air pollution caused by volatile organic compounds (VOCs). However, this approach is typically used for single VOCs treatment but not for the mixtures of VOC and volatile organic sulfur compounds (VOSCs), even if they are often encountered in industrial applications. Therefore, we investigated the performance of BTF for single and ternary mixture gas of dimethyl sulfide (DMS), propanethiol, and toluene, respectively. Results showed that the co-treatment enhanced the removal efficiency of toluene, but not of dimethyl sulfide or propanethiol. Maximum removal rates (rmax) of DMS, propanethiol and toluene were calculated to be 256.41 g·m−3·h−1, 204.08 g·m−3·h−1 and 90.91 g·m−3·h−1, respectively. For a gas mixture of these three constituents, rmax was measured to be 114.94 g·m−3·h−1, 104.17 g·m−3·h−1 and 99.01 g·m−3·h−1, separately. Illumina MiSeq sequencing analysis further indicated that Proteobacteria and Bacteroidetes were the major bacterial groups in BTF packing materials. A shift of bacterial community structure was observed during the biodegradation process.
Highlights
The removal of odorous waste, including volatile organic sulfur compounds (VOSCs) has been paid increasing attention for air pollution control solutions, considering their aqueous solubility and gradual diffusion into the atmosphere [1,2,3]
VOSCs very often co-exist with volatile organic compounds (VOCs)
The biotrickling filter (BTF) was tested under different conditions from phase I to phase III
Summary
The removal of odorous waste, including volatile organic sulfur compounds (VOSCs) has been paid increasing attention for air pollution control solutions, considering their aqueous solubility and gradual diffusion into the atmosphere [1,2,3]. The traditional approaches for the removal of VOSCs and VOCs from a gas stream are mostly physical methods (filtration, adsorption, dilution by clean air, and condensation) and chemical methods (chemical oxidation, thermal oxidation, chemical adsorption, and UV activation method) [5,6,7]. (4) Comparing BTF with other popular approaches, such as RTO or RCO, shows that biotrickling will not generate secondary air pollutants, such NOx. BTF transfers VOCs or VOSCs to CO2 and H2 O, it transfers to the intermediates and biomass in an eco-friendly way. Biotrickling filter has an advantage over many biological treatment technologies in the control of operating parameters and mineralized efficiency, especially for high concentration acidified contaminants containing waste gas streams, such as sulfur, chlorine, or nitrogen containing compounds [19,20,21]. The biofilms from three different periods were collected and sequenced using the Illumina MiSeq platform for a comprehensive understanding of microbial compositions and structures
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