Partial nitritation of landfill leachate with varying influent composition under intermittent aeration conditions |
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| Authors: | Huosheng Li Shaoqi Zhou Guotao Huang Bin Xu |
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| Institution: | 1. College of Environmental Science and Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, 510006, PR China;2. State Key Laboratory of Subtropical Building Sciences, South China University of Technology, Guangzhou 510641, PR China;3. Key Laboratory of Environmental Protection and Eco-remediation of Guangdong Regular Higher Education Institutions, South China University of Technology, Guangzhou Higher Education Mega Center, 510006, PR China;4. College of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, PR China;1. Department of Biotechnology, Delft University of Technology, Delft, The Netherlands;2. Chemical Engineering Program, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;3. Institute of Microbiology Prof. Paulo de Goés, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;1. LEQUIA, Institute of the Environment, University of Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain;2. Advanced Water Management Centre, Building 60, Research Road, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia;3. Group of Molecular Microbial Ecology, Institute of Aquatic Ecology (UdG), Campus Montilivi, E-17071 Girona, Catalonia, Spain;1. School of Environment & Natural Resource, Renmin University of China, No. 59 Zhongguancun Street, Haidian District, Beijing 100872, China;2. Chaoyang District Bureau of Water Resources of Beijing Municipality, No. 1 North Rd, Tuanjiehu, Chaoyang District, Beijing 100026, China;3. National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | The start-up and operation of a partial nitritation sequencing batch reactor for the treatment of landfill leachate were carried out on intermittent aeration mode. Partial nitrite accumulation was established in 15 days after the mode was changed from continuous aeration to intermittent aeration. Despite the varying influent composition, partial nitritation could be maintained by adjusting the hydraulic retention time (HRT) and the air flow rate. An increase in the air flow rate together with a decrease in air off duration can improve the partial nitritation capacity and eventually result in the development of granular sludge with fine diameters. A nitrogen loading rate of 0.71 ± 0.14 kg/m3/d and a COD removal rate of 2.21 ± 0.13 kg/m3/d were achieved under the conditions of an air flow rate of 19.36 ± 1.71 m3 air/m3/h and an air on/off duration of 1.5 min/0.7 min. When the ratio of total air flux (TAF) to the influent loading rate (ILR) was controlled at the range of 163–256 m3 air/kg COD, a stable effluent NO3?–N/NOx?–N (NO2?–N plus NO3?–N) ratio below 13% was achieved. Interestingly, the effluent pH was found to be a good indicator of the effluent NO2?–N/NH4+–N ratio, which is an essential parameter for a subsequent anaerobic ammonium oxidation (Anammox) reactor. |
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