Bayesian Networks and Decision Graphs
Bayesian Networks and Decision Graphs
Fuzzy Sets Engineering
Neural Networks - 2006 special issue: Earth sciences and environmental applications of computational intelligence
Neural Networks - 2006 special issue: Earth sciences and environmental applications of computational intelligence
Artificial neural networks for rapid WWTP performance evaluation: Methodology and case study
Environmental Modelling & Software
A new approach to testing an integrated water systems model using qualitative scenarios
Environmental Modelling & Software
Intelligent control aeration and external carbon addition for improving nitrogen removal
Environmental Modelling & Software
Environmental Modelling & Software
Fuzzy modelling of the composting process
Environmental Modelling & Software
FUZZ-IEEE'09 Proceedings of the 18th international conference on Fuzzy Systems
A proposed model for measuring the aggregative risk degree of implementing E-learning ERP system
ACS'10 Proceedings of the 10th WSEAS international conference on Applied computer science
A methodology for the design and development of integrated models for policy support
Environmental Modelling & Software
Supporting decision making in urban wastewater systems using a knowledge-based approach
Environmental Modelling & Software
Review: Improving urban wastewater management through an auction-based management of discharges
Environmental Modelling & Software
Argumentation-based framework for industrial wastewater discharges management
Engineering Applications of Artificial Intelligence
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This paper proposes a risk assessment model for settling problems of microbiological origin in activated sludge systems (filamentous bulking, foaming and rising sludge). The aim of the model is not to diagnose microbiology-related solids separation problems with absolute certainty but to quantify in dynamic scenarios whether simulated operational procedures and control strategies lead to favourable conditions for them to arise or not. The rationale behind the model (which integrates the mechanisms of standard activated sludge models with empirical knowledge), its implementation in a fuzzy rule-based system and the details of its operation are illustrated in the different sections of the paper. The performance of the risk assessment model is illustrated by evaluating a number of control strategies facing different short-term influent conditions as well as long-term variability using the IWA/COST simulation benchmark. The results demonstrate that some control strategies, although performing better regarding operating costs and effluent quality, induce a higher risk for solids separation problems. In view of these results, it is suggested to integrate empirical knowledge into mechanistic models to increase reliability and to allow assessment of potential side-effects when simulating complex processes.