Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/152747
Title: Integrated upflow anaerobic fixed-bed and single-stage step-feed process for mainstream deammonification : a step further towards sustainable municipal wastewater reclamation
Authors: Gu, Jun
Zhang, Meng
Wang, Siyu
Liu, Yu
Keywords: Engineering::Environmental engineering
Issue Date: 2019
Source: Gu, J., Zhang, M., Wang, S. & Liu, Y. (2019). Integrated upflow anaerobic fixed-bed and single-stage step-feed process for mainstream deammonification : a step further towards sustainable municipal wastewater reclamation. The Science of the Total Environment, 678, 559-564. https://dx.doi.org/10.1016/j.scitotenv.2019.05.027
Journal: The Science of the total environment
Abstract: The high energy consumption and excessive waste activated sludge (WAS) production have become the major concerns on the municipal wastewater treatment with conventional biological processes. To tackle these emerging issues, this study demonstrated the feasibility of a novel process integrating an upflow anaerobic fixed-bed reactor (UAFBR) followed by a continuous step-feed reactor for mainstream deammonification towards improved energy efficiency, minimized sludge production and cost-effective ammonium removal. The results showed that 48.8% of the influent chemical oxygen demand (COD) was directly converted to methane gas in UAFBR with minimized sludge production, while 80% of total nitrogen (TN) was removed in the step-feed reactor. Mass balance on the step-feed reactor revealed that the oxic chambers contributed 51.6% of the removed ammonium oxidation to mainly nitrite, while the produced nitrite was immediately removed via anammox with the ammonium supplied by the step-feed in the following anoxic chambers where about 87.1% TN removal occurred. Moreover, it was found that sustainable repression of nitrite oxidizing bacteria (NOB) was achieved without compromising the activity of ammonia oxidizing bacteria (AOB). The anammox bacteria were effectively retained in the anoxic chambers and showed a high specific anammox activity of 0.42 g N/(g VSS·day). These suggest that the step-feed configuration can offer a feasible engineering option towards single-stage mainstream deammonification. It appears that the integrated process developed in this study sheds light on the possible way towards sustainable, energy self-sufficient municipal wastewater reclamation.
URI: https://hdl.handle.net/10356/152747
ISSN: 0048-9697
DOI: 10.1016/j.scitotenv.2019.05.027
Rights: © 2019 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:IGS Journal Articles

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