Real-Time Control and Effluent Ammonia Violations Induced by Return Liquor Overloads
Abstract:Whole plant modeling and control has received increasing attention in recent years and as a result the Benchmark Simulation Model No 2 (BSM2) platform was developed to compare control strategies. The objective of this paper consists of evaluating whether MLSS concentration control (with changing setpoints in summer and winter time to maintain nitrification capacity) could lead to effluent ammonia violations due to return liquor overloads and how such violations could be minimised by introducing alternative control systems. In this study three different control strategies have been implemented in the BSM2 platform, simulated and evaluated from a whole plant perspective. The results show that with the implementation of the MLSS controller a large overload is applied to the digester at the end of the winter period, but the large retention time of the anaerobic digester sufficiently dampens this overload. On the other hand, the flows can be treated more efficiently when storing the nitrogen-rich return flows during day time and releasing them at night using a simple timer-based controller.
Document Type: Research Article
Publication date: January 1, 2010
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