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Open AccessArticle

Synthesis and Performance of Iron Oxide-Coated Ceramsite in a Biotrickling Filter for Nitric Oxide Removal under Thermophilic Conditions

1
Postdoctoral Research Base, Henan Institute of Science and Technology, Xinxiang 453003, China
2
School of Environment, Henan Normal University, Xinxiang 453007, China
3
Department of Human Resources, Henan Institute of Technology, Xinxiang 453003, China
4
School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(3), 359; https://doi.org/10.3390/ma11030359
Received: 25 January 2018 / Revised: 22 February 2018 / Accepted: 26 February 2018 / Published: 28 February 2018
(This article belongs to the Section Porous Materials)
A novel medium consisting of iron oxide-coated porous ceramsite (modified ceramsite) was investigated for NO removal under thermophilic conditions in this study. We used a surface coating method with FeCl3·6H2O as the modifier. When ceramsite was calcined for 4 h at 500 °C, the surface pH value decreased to 3.46, which is much lower than the isoelectric point of ceramsite, ensuring its surface was electropositive. The surface of modified ceramsite changed from two- to three-dimensional and exhibited excellent adsorption behavior to assist microbial growth; the maximum dry weight of the biofilm was 1.28 mg/g. It only took 8 days for the biofilter constructed from the modified ceramsite to start up, whereas that packed with commercial ceramsite took 22 days. The NO removal efficiency of the biofilter did not decrease apparently at high NO inlet concentration of above 1600 mg/m3 and maintained an average value of above 90% during the whole operation period. Additionally, the morphological observation showed that the loss of the surface coating was not obvious, and the coating properties remained stable during long-term operation. The maximum NO inlet loading of the biotrickling filter was 80 g/(m3·h) with an average removal efficiency of 91.1% along with a quick start-up when using the modified ceramsite filler. Thus, modified ceramsite can be considered a very effective medium in biotrickling filters for NO removal. View Full-Text
Keywords: iron oxide-coated porous ceramsite; biofilter; microbial growth; NO removal iron oxide-coated porous ceramsite; biofilter; microbial growth; NO removal
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Li, H.; Guo, Z.; Wu, D.; Fan, J.; Huang, S.; Zhou, S. Synthesis and Performance of Iron Oxide-Coated Ceramsite in a Biotrickling Filter for Nitric Oxide Removal under Thermophilic Conditions. Materials 2018, 11, 359.

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