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https://doi.org/10.3390/w12082234
Title: | Nitrogen removal for liquid-ammonia mercerization wastewater via partial nitritation/anammox based on zeolite sequencing batch reactor | Authors: | Zheng, L. Chen, Y. Zhou, S. Chen, Y. Wang, X. Wang, X. Zhang, L. Chen, Z. |
Keywords: | Anammox Liquid-ammonia mercerization wastewater Nitritation SBR Zeolite |
Issue Date: | 2020 | Publisher: | MDPI AG | Citation: | Zheng, L., Chen, Y., Zhou, S., Chen, Y., Wang, X., Wang, X., Zhang, L., Chen, Z. (2020). Nitrogen removal for liquid-ammonia mercerization wastewater via partial nitritation/anammox based on zeolite sequencing batch reactor. Water (Switzerland) 12 (8) : 2234. ScholarBank@NUS Repository. https://doi.org/10.3390/w12082234 | Rights: | Attribution 4.0 International | Abstract: | Liquid-ammonia mercerization is commonly used to enhance the quality of cotton fabric in the textile industry, resulting in a large amount of liquid-ammonia mercerization wastewater (LMWW) containing high concentration of ammonia to be disposed of. This study proposes a partial nitritation/anammox (PN/A) process based on stable nitritation by a zeolite sequencing batch reactor (ZSBR) for the nitrogen removal of LMWW. The ZSBR could quickly achieve stably full nitritation with a nitrite accumulation ratio higher than 97% and an ammonia removal rate of 0.86 kg Nm-3d-1 for the raw LMWW with an ammonia level of 1490 mg/L. In order to avoid anammox inhibition by free nitrous acid, the ZSBR was successfully changed to PN operation with dilutedLMWWfor effluent meeting anammox requirements. The next anammox reactor (an up-flow blanket filter (UBF) realized a total nitrogen removal efficiency of 70.0% with a NLR (nitrogen loading rate) of 0.82 kg Nm-3d-1 for LMWW. High-throughput sequencing analysis results indicated that Nitrosomonas and Candidatus Kuenenia were the dominant bacteria in ZSBR and UBF, respectively. All results revealed that the PN/A process based on ZSBR as the PN pretreatment process was feasible for LMWW, facilitating cost-effective and low-carbon nitrogen removal for LMWW treatment in the textile industry in the future. © 2020 by the authors. | Source Title: | Water (Switzerland) | URI: | https://scholarbank.nus.edu.sg/handle/10635/197749 | ISSN: | 20734441 | DOI: | 10.3390/w12082234 | Rights: | Attribution 4.0 International |
Appears in Collections: | Students Publications |
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