Chemically enhancing primary clarifiers: model-based development of a dosing controller and full-scale implementation

Abstract

Chemically enhanced primary treatment (CEPT) can be used to mitigate the adverse effect of wet weather flow on wastewater treatment processes. In particular, it can reduce the particulate pollution load to subsequent secondary unit processes, such as biofiltration, which may suffer from clogging by an overload of particulate matter. In this paper, a simple primary clarifier model able to take into account the effect of the addition of chemicals on particle settling is presented. Control strategies that optimize the treatment process by chemical addition were designed and tested by running simulations with this CEPT model. The most adequate control strategy in terms of treatment performance, chemicals saving, and maintenance effort was selected. Full-scale implementation of the controller was performed during the autumn of 2015, and the results obtained confirmed the behaviour of the controlled system. Practical issues related to the implementation are presented.

Including snowmelt in influent generation for cold climate WRRFs: comparison of data-driven and phenomenological approaches

“…The Quebec East WRRF is receiving domestic wastewater, industrial wastewater, and the infiltration of storm and ground water from a combined sewer system, with an average flowrate generated by around 300 000 PE (around 0.7 × 10 4 m 3 h −1 ). 28 This flowrate increases up to 2.5 × 10 4 m 3 h −1 at the end of winter, due to snowmelt and infiltration (Fig. 1).…”

An influent generator for WRRF design and operation based on a recurrent neural network with multi-objective optimization using a genetic algorithm

“…In this study, the IG modelling approach was developed based on data collected in Quebec City, Canada (Tik & Vanrolleghem 2017). The catchment is a combined sewer system, with a very variable flowrate and pollutant concentration under different weather conditions, such as storm water and particularly, the snowmelt at the end of winter.…”

Modeling, Instrumentation, Automation, and Optimization of Water Resource Recovery Facilities

“…Over the last 40 years many different control methodologies for substrate feed control of anaerobic digestion processes have been proposed in order to increase plant efficiency and sustainable long-term energy production. A review provided by Gaida, et al (2017) Control strategies that optimize the treatment process by chemical addition were designed and tested by Tik and Vanrolleghem (2017) assessed. Zeferino (2017) developed a decision support approach for the planning of regional wastewater systems.…”