Development and economic assessment of different WWTP control strategies for optimal simultaneous removal of carbon, nitrogen and phosphorus

Journal article

Authors / Editors

Agachi, Paul

Research Areas

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Publication Details

Author list: Ostace GS, Baeza JA, Guerrero J, Guisasola A, Cristea VM, Agachi PS, Lafuente J

Publisher: Elsevier

Place: OXFORD

Publication year: 2013

Journal: Computers & Chemical Engineering (0098-1354)

Journal acronym: COMPUT CHEM ENG

Volume number: 53

Start page: 164

End page: 177

Number of pages: 14

ISSN: 0098-1354

Languages: English-Great Britain (EN-GB)

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Abstract

This paper presents the comparison of four control strategies for the A(2)/O WWTP configuration for simultaneous C, N and P removal. The control strategies: (i) external COD-P control; (ii) external recycle flow-P control; (iii) nitrate control in the last anoxic reactor; (iv) ammonia control in the last aerobic reactor, were combined with other common control loops to build different control structures and were simulated in Matlab/Simulink under different influent conditions. A systematic approach was conducted with all the strategies to assess their potential effectiveness, according to the following steps: theoretical design, setpoint optimization and, finally, a detailed comparison of the control results against a reference operation and an optimized reference scenario. The optimization of the reference operation presented a 7% reduction of the total operational cost. The simulation results showed that some control strategies further reduced 3-7.5% the WWTP operational costs while the effluent quality is greatly improved. (C) 2013 Elsevier Ltd. All rights reserved.

Keywords

A(2)/O, CONTROL, EBPR, MPC, Optimization, WWTP

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