Journal article
Control structure design for resource recovery using the enhanced biological phosphorus removal and recovery (EBP2R) activated sludge process
Department of Environmental Engineering, Technical University of Denmark1
Water Technologies, Department of Environmental Engineering, Technical University of Denmark2
Technical University of Denmark3
Department of Chemical and Biochemical Engineering, Technical University of Denmark4
CAPEC-PROCESS, Department of Chemical and Biochemical Engineering, Technical University of Denmark5
Nowadays, wastewater is considered as a set of resources to be recovered rather than a mixture of pollutantsthat should be removed. Many resource recovery schemes have been proposed, involving the useof novel technologies whose controllability is poorly studied. In this paper we present a control structurefor the novel enhanced biological phosphorus removal and recovery (EBP2R) process, which is currentlyunder development.
The aim of the EBP2R is to maximize phosphorus recovery through optimal greenmicro-algal cultivation, which is achieved by controlling the nitrogen to phosphorus ratio (N-to-P ratio)fed to the algae. Process control structures are developed for a sequencing batch reactor (SBR) and a continuous flow reactor system (CFS).
Results, obtained using the Benchmark Simulation Model No. 1 (BSM1) dynamic input disturbance time series, suggest that the SBR can maintain a stable N-to-P ratio in the effluent (16.9 ± 0.07) and can recover about 72% of the influent phosphorus. The phosphorus recovered by the CFS is limited by the influent nitrogen (65% of the influent phosphorus load).
Using the CFS configuration the effluent N-to-P ratio cannot be effectively controlled (16.45 ± 2.48). Therefore, it is concluded that the SBR is the most effective reactor configuration for the EBP2R process. Importantly, the designed control structures rely on control loops that do not require chemical dosing for nutrient management, thereby reducing the environmental footprint of the EBP2R process.
The proposed control strategies can be applied to other phosphorus recovery schemes where short sludge age EBPR systemsplay an important role.
Language: | English |
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Year: | 2016 |
Pages: | 447-457 |
ISSN: | 18733212 and 13858947 |
Types: | Journal article |
DOI: | 10.1016/j.cej.2016.03.021 |
ORCIDs: | Valverde Perez, Borja , Flores Alsina, Xavier , Gernaey, Krist and Huusom, Jakob Kjøbsted |