Study on a discrete-time dynamic control model to enhance nitrogen removal with fluctuation of influent in oxidation ditches.

The aim of study was proposed a new control model feasible on-line implemented by Programmable Logic Controller (PLC) to enhance nitrogen removal against the fluctuation of influent in Carrousel oxidation ditch. The discrete-time control model was established by confirmation model of operational conditions based on a expert access, which was obtained by a simulation using Activated Sludge Model 2-D (ASM2-D) and Computation Fluid Dynamics (CFD), and discrete-time control model to switch between different operational stages. A full-scale example is provided to demonstrate the feasibility of the proposed operation and the procedure of the control design. The effluent quality was substantially improved, to the extent that it met the new wastewater discharge standards of NH(3)-N<5mg/L and TN<15 mg/L enacted in China throughout a one-day period with fluctuation of influent.

[1]  D. Mayne,et al.  Receding horizon control of nonlinear systems , 1990 .

[2]  P.J. Antsaklis,et al.  Stability of discrete-time plants using model-based control with intermittent feedback , 2008, 2008 16th Mediterranean Conference on Control and Automation.

[3]  I. Takács.  A dynamic model of the clarification-thickening process , 1991 .

[4]  Harald Kainz,et al.  Adaption of the main waste water treatment plant in Vienna to meet Austrian emission regulations , 1996 .

[5]  Glen T. Daigger,et al.  Biological wastewater treatment. , 2011 .

[6]  B. Launder,et al.  The numerical computation of turbulent flows , 1990 .

[7]  Eran Friedler,et al.  Quantifying the inherent uncertainty in the quantity and quality of domestic wastewater , 1996 .

[8]  Yanchen Liu,et al.  Study of operational conditions of simultaneous nitrification and denitrification in a Carrousel oxidation ditch for domestic wastewater treatment. , 2010, Bioresource technology.

[9]  G. Insel,et al.  Effect of Aeration on Nutrient Removal Performance of Oxidation Ditch Systems , 2005 .

[10]  L.J.S. Lukasse,et al.  Optimal control of N-removal in ASPs , 1998 .

[11]  M Poch,et al.  Enhancing biological nitrogen removal in a small wastewater treatment plant by regulating the air supply. , 2004, Water science and technology : a journal of the International Association on Water Pollution Research.

[12]  W. Gujer,et al.  Activated sludge model No. 3 , 1995 .

[13]  J. Dudley.  Process testing of aerators in oxidation ditches , 1995 .

[14]  J. Comas,et al.  Energy Saving in a Wastewater Treatment Process: an Application of Fuzzy Logic Control , 2005, Environmental technology.

[15]  H. Doddema,et al.  Conditions and mechanisms affecting simultaneous nitrification and denitrification in a Pasveer oxidation ditch , 1997 .

[16]  Long Fan,et al.  Numerical simulation of secondary sedimentation tank for urban wastewater , 2007 .

[17]  Bruce E. Rittmann,et al.  Simultaneous denitrification with nitrification in single-channel oxidation ditches , 1985 .

[18]  Mogens Henze,et al.  Activated Sludge Model No.2d, ASM2D , 1999 .