Improving the performance of coupled solid carbon source biofilm carriers through pore-forming methods

Coupled solid carbon source biofilm carriers (CCBs) was usually utilized to enhance the treatment efficiency of low carbon/nitrogen (C/N) wastewater. However, current CCBs have low carbon release capacity because of its small inner mass transfer coefficient. Therefore, this study innovatively applie...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2022-12, Vol.308, p.136172-136172, Article 136172
Main Authors: Zou, Linzhi, Zhou, Mi, Qin, Chuan, Luo, Zhongwu, Zhang, Houlin, Yang, Zhi, Cheng, Hong, Li, Runjia, He, Qiang, Ai, Hainan
Format: Article
Language:English
Subjects:
Biofilm
Circulating freezing pore-forming
Low C/N wastewater
Orthogonal selections
Solid carbon source
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Summary:Coupled solid carbon source biofilm carriers (CCBs) was usually utilized to enhance the treatment efficiency of low carbon/nitrogen (C/N) wastewater. However, current CCBs have low carbon release capacity because of its small inner mass transfer coefficient. Therefore, this study innovatively applied pore-forming methods to modify CCBs. After orthogonal selections, two porous CCBs, which were respectively prepared through circulating freezing pore-forming method (CCB2) and ammonium bicarbonate pore-forming method (CCB3), were proposed and further applied in sequencing batch moving bed biofilm reactors (SBMBBRs). The results indicated that circulating freezing pore-forming method could improve the mechanical strength and carbon source release rate of CCBs. In addition, CCB2 could significantly enhance the total nitrogen (TN) removal efficiency of SBMBBRs, when compared with the non-porous CCBs (i.e., CCB1). Further biofilm and simultaneous nitrification and denitrification (SND) rate calculation attributed this enhancement to the higher biofilm amount (i.e., 0.06 g g−1 CCB) and the higher SND rate (i.e., 33.60%). Microbial community analysis reiterated these observations that CCB2 and CCB3 could accumulate Proteobacteria, Actinobacteriota and Nitrospirota, and also stimulate nitrification and denitrification associated pathways. More importantly, the cost calculation indicated CCB2 cost only 47.37% of CCB1 and 31.34% of CCB3, showing highly economic applicability. Overall, our results collectively proved that CCBs manufactured by circulating freezing pore-forming method could provide more carbon releasing points and microorganisms attaching positions, exhibiting effectively nitrogen removal when treating low C/N wastewater. [Display omitted] •Pore-formation methods enhanced the carbon release.•Pore-formation methods boosted biofilm formation by offering more bacteria attaching position.•Coupled solid carbon source biofilm carriers (CCBs) manufactured by CF-PFM (i.e., CCB2) promoted the SND rate.•CCB2 simulated the expression of nitrogen cycling associated genes.•CF-PFM decreased the manufacture cost of CCBs.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2022.136172