NDLI: Nitrogen Removal for Liquid-Ammonia Mercerization Wastewater via Partial Nitritation/Anammox Based on Zeolite Sequencing Batch Reactor

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Nitrogen Removal for Liquid-Ammonia Mercerization Wastewater via Partial Nitritation/Anammox Based on Zeolite Sequencing Batch Reactor

Content Provider	MDPI
Author	Zheng, Lei Chen, Yongxing Zhou, Songwei Chen, Yuchen Wang, Xingxing Wang, Xiaojun Zhang, Lijuan Chen, Zhenguo
Copyright Year	2020
Description	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 N·m−3·d−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 diluted LMWW for 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 N·m−3·d−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.
Starting Page	2234
e-ISSN	20734441
DOI	10.3390/w12082234
Journal	Water
Issue Number	8
Volume Number	12
Language	English
Publisher	MDPI
Publisher Date	2020-08-08
Access Restriction	Open
Subject Keyword	Water Environmental Engineering Water Science and Technology Liquid-ammonia Mercerization Wastewater Zeolite Sbr Nitritation Anammox
Content Type	Text
Resource Type	Article

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