title: Study on a discrete-time dynamic control model to enhance nitrogen removal with fluctuation of influent in oxidation ditches.
abstract: 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.
authors.affiliation: State Key Joint Laboratory of Environment Simulation and Pollution Control, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Yanchen
authors.initials: Y
authors.lastname: Liu
authors.forename: Hanchang
authors.initials: H
authors.lastname: Shi
authors.forename: Huiming
authors.initials: H
authors.lastname: Shi
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Wang
mesh_terms: D008956:Models, Chemical; D009584:Nitrogen / Q000302:isolation & purification*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis; D015203:Reproducibility of Results; D012722:Sewage / Q000737:chemistry*; D013997:Time Factors; D014865:Waste Disposal, Fluid; D018508:Water Purification
chemical_list: D012722:Sewage; D009584:Nitrogen; D010100:Oxygen