An Efficient Bioaggregate Reactor for Enhanced Denitrification of Sewage with Low Carbon/Nitrogen Ratio. Issue 9 (22nd July 2021)

• Record Type: Journal Article
• Authors: Chen, Changlun; Ali, Amjad; Su, Junfeng; Gao, Jing
• Is Part Of: Chemical engineering & technology. Volume 44:Issue 9(2021)
• Page Start: 1631
• Page End: 1640
• Publication Date: 2021-07-22
• Subjects: Biodegradation -- Carbon/nitrogen ratio -- Extracellular polymer substances -- Heterotrophic denitrification; Chemical engineering -- Periodicals; Chemical processes -- Periodicals; 660.05
• DOI: 10.1002/ceat.202100060
• Languages: English
• ISSNs: 0930-7516

Abstract

Abstract: This study developed a bioaggregate reactor by using Pseudomonas strain GF2. The response surface method indicated that the optimal parameters were pH 7, a hydraulic retention time (HRT) of 6 h, and an initial nitrate concentration of 25 mg L −1 . Nitrate removal reached a maximum of 99.19 % at a C/N ratio of 2. Gas chromatographic detection revealed that nitrogen gas was the main product (98.46 %). 3D fluorescence spectroscopy showed that, with increasing HRT, the amounts of fulvic acid‐like, tryptophan, and protein‐like substances increased, which were consistent with the change in microbial community. Fourier transform infrared spectroscopy confirmed the existence of OH, CH, C=O, and C=C. High‐throughput sequencing showed that Pseudomonas and Azospira were the dominant genera. Abstract : Nitrate in domestic wastewater poses a threat to the environment and human health, but the low C/N ratio of domestic sewage hinders microbial denitrification. A bioaggregate reactor was developed to treat low‐C/N wastewater, and the operating parameters were optimized by the response surface method. Almost complete nitrate removal was achieved, with nitrogen gas as final denitrification product.