Cost reduction of the wastewater treatment plant operation by MPC based on modified ASM1 with two-step nitrification/denitrification model

Journal article

Authors / Editors

Agachi, Paul

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Publication Details

Author list: Ostace GS, Cristea VM, Agachi PS

Publisher: Elsevier

Place: OXFORD

Publication year: 2011

Journal: Computers & Chemical Engineering (0098-1354)

Journal acronym: COMPUT CHEM ENG

Volume number: 35

Issue number: 11

Start page: 2469

End page: 2479

Number of pages: 11

ISSN: 0098-1354

Languages: English-Great Britain (EN-GB)

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Abstract

The Activated Sludge Model No. 1 (ASM1) considers that nitrification and denitrification are single step processes and nitrite nitrogen (NO2-N), which is an intermediate for the two processes, is not accounted for. The first part of this paper presents the development of an enhanced ASM1 with two step nitrification/denitrification processes and its implementation in the Benchmark Simulation Model No. 1 wastewater treatment plant (WWTP). The secondary settler was considered to be reactive in order to achieve a better fit between the simulation model and the behavior of the real WWTP. The second part presents the investigation of Model Predictive Control approach for the advanced control of the WWTP. Two control strategies are implemented for the wastewater treatment plant and they are analyzed from the perspective of the benefits brought to the WWTP operation. The proposed control strategy shows a reduction of the operational costs and the improvement of the effluent quality index. (C) 2011 Elsevier Ltd. All rights reserved.

Keywords

denitrification, MPC, nitrification, reactive secondary settler

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