Cite this paper:
CAO Jiashun, OLEYIBLO Oloche James, XUE Zhaoxia, OTACHE Y. Martins, FENG Qian. Achieving low effluent NO3-N and TN concentrations in low influent chemical oxygen demand (COD) to total Kjeldahl nitrogen (TKN) ratio without using external carbon source[J]. Journal of Oceanology and Limnology, 2015, 33(4): 1039-1052

Achieving low effluent NO3-N and TN concentrations in low influent chemical oxygen demand (COD) to total Kjeldahl nitrogen (TKN) ratio without using external carbon source

CAO Jiashun1,2,3, OLEYIBLO Oloche James2, XUE Zhaoxia1,2,3, OTACHE Y. Martins4, FENG Qian1,2
1 Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China;
2 College of Environment, Hohai University, Nanjing 210098, China;
3 National Engineering Research Center of Water Resource Efficient Utilization and Engineering Safety, Hohai University, Nanjing 210098, China;
4 Department of Agricultural & Bioresources Engineering, Federal University of Technology, P. M. B 65, Minna, Niger State, Nigeria
Two mathematical models were used to optimize the performance of a full-scale biological nutrient removal (BNR) activated treatment plant, a plug-flow bioreactors operated in a 3-stage phoredox process configuration, anaerobic anoxic oxic (A2/O). The ASM2d implemented on the platform of WEST2011 software and the BioWin activated sludge/anaerobic digestion (AS/AD) models were used in this study with the aim of consistently achieving the designed effluent criteria at a low operational cost. Four ASM2d parameters (the reduction factor for denitrification (η NO3, H), the maximum growth rate of heterotrophs (μH), the rate constant for stored polyphosphates in PAOs (qpp), and the hydrolysis rate constant (kh)) were adjusted. Whereas three BioWin parameters (aerobic decay rate (bH), heterotrophic dissolved oxygen (DO) half saturation (KOA), and YP/acetic) were adjusted. Calibration of the two models was successful; both models have average relative deviations (ARD) less than 10% for all the output variables. Low effluent concentrations of nitrate nitrogen (N-NO3), total nitrogen (TN), and total phosphorus (TP) were achieved in a full-scale BNR treatment plant having low influent chemical oxygen demand (COD) to total Kjeldahl nitrogen (TKN) ratio (COD/TKN). The effluent total nitrogen and nitrate nitrogen concentrations were improved by 50% and energy consumption was reduced by approximately 25%, which was accomplished by converting the two-pass aerobic compartment of the plug-flow bioreactor to anoxic reactors and being operated in an alternating mode. Findings in this work are helpful in improving the operation of wastewater treatment plant while eliminating the cost of external carbon source and reducing energy consumption.
Key words:    anaerobic anoxic oxic (A2/O) process|activated sludge|ASM2d|BioWin AS/AD|WEST2011   
Received: 2014-07-19   Revised: 2014-11-21
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