Abstract
The purpose of this study is to investigate the enhancement of polycaprolactone (PCL) on total nitrogen (TN) removal of coal pyrolysis wastewater (CPW) with low COD to nitrogen ratio by partial nitrification-denitrification bioprocess (PNDB) in one single reactor. With the innovative combination of PCL and PNDB, the TN removal efficiency in the experimental reactor (signed as R1) was 10.21% higher than control reactor (R2). Nitrite accumulation percentage (NAP) in R1 was 82.02%, which was 17.49% higher than R2 at the dissolved oxygen (DO) concentration of 0.9–1.5 mg/L, for the reason that the extra DO was consumed by PCL biodegradation at the aerobic period. Gel permeation chromatography (GPC) results demonstrated that organics with the molecular weight of 185 Da, which could serve as additional carbon sources for denitrifiers, were generated during the PCL hydrolysis process at the anoxic period. PCL was hydrolyzed by extracellular enzymes with the break of the ester bond which was confirmed by FT-IR spectrometer. Microbial community analysis revealed that Ferruginibacter was the dominant hydrolysis bacteria in R1. Nitrosomonas were the main ammonium-oxidizing bacteria (AOB) and Hyphomicrobium were the denitrifiers in this study.
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This work was supported by National key research and development program-China (2017YFB0602804).
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Highlights
• Partial nitrification-denitrification operated well for nitrogen removal in CPW.
• NAP in R1 with PCL added was 17.49% higher than control reactor.
• Low MW organics hydrolyzed by PCL could be utilized by Hyphomicrobium.
• PCL was hydrolyzed by extracellular enzymes excreted by hydrolysis bacteria in R1.
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Zhang, Z., Xu, C., Zhong, D. et al. Enhanced nitrogen removal of coal pyrolysis wastewater with low COD to nitrogen ratio by partial nitrification-denitrification bioprocess assisted with polycaprolactone. Environ Sci Pollut Res 26, 21655–21667 (2019). https://doi.org/10.1007/s11356-019-05416-3
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DOI: https://doi.org/10.1007/s11356-019-05416-3