Journal
BIORESOURCE TECHNOLOGY
Volume 265, Issue -, Pages 357-364Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.06.023
Keywords
Dual recycling system; Pre-denitrification; Partial nitrification-Anammox (PN-Anammox); Landfill leachate; Microbiology community; Nitrogen removal efficiency
Funding
- Natural Science Foundation of China, China [51408387, 51478284, 21607110]
- National Key Research and Development Programme of China, United States [2016YFC 0401103]
- Second Phase Program for Advantageous Characteristic Subject of Jiangsu Province
- Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment
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An efficient and stable combined denitrification-partial nitrification-Anammox process with a dual recycling system was used to remove nitrogen from mature landfill leachate. After 155 d of operation, the NO3- as the PN-Anammox byproduct was almost treated with biodegradable organic carbon in raw wastewater in a pre-denitrification reactor by external recycling system. When raw landfill leachate with NH4+ -N concentration of 1900 mg/L was treated, an integrated reactor with airlift recycling was combined with the PN and Anammox reactions to efficiently remove NH4+ from the inflow. The total nitrogen concentration of effluent stabilized at 20 mg/L and total nitrogen removal efficiency was 99%. The maximum NO2- production rate in the aerobic zone was 2.2 kg/(m(3).d) and the maximum nitrogen removal rate in the anaerobic zone was 21.4 kg/(m(3).d). The most common phyla among the nitrification and the Anammox functional bacteria were Nitrosomonas, Candidatus Kuenenia, and Candidatus Brocadia after landfill leachate treatment.
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