Abstract: Aeration is an essential component of aerobic biological wastewater treatment and is the largest energy consumer at most water resource recovery facilities. Most modelling studies neglect the inherent complexity of the aeration systems ...
Abstract: During the design of a water resource recovery facility, it is becoming industry practice to use simulation software to assist with process design. Aeration is one of the key components of the activated sludge process, and is one of the ...
Abstract: In collaboration with the Metropolitan Water Reclamation District of Greater Chicago (MWRDGC), the environmental biotechnology research group at Northwestern University (NU) is conducting a laboratory-scale investigation of enhanced ...
Rosenthal A.;Roots P.;Yang F.;Kozak J.;Zhang H.;Wells G.
Abstract: An innovative biofilm model has been developed that allows modeling of a granular sludge sequencing batch reactor (GSBR) in a single tank without the need for a separate variable volume tank and a recycle stream. The model has a variable ...
Abstract: A model-based treatment performance and energy audit of the Girona WRRF in Spain was conducted using advanced and fully dynamic air supply models. The focus of the study was on the aeration system, which represents 63% of the plant’s ...
Abstract: A method for implementing a multivariate Partial Least Squares (PLS) soft sensor is discussed with a focus on sensor robustness. Practical aspects of implementation are examined including handling of missing or poor input data, sensor and ...
Abstract: Time series analysis methods have been applied to water resource recovery facility (WRRF) data. Although time series methods are well understood, the practical aspects of their use and implementation are not often discussed. In the study ...
Abstract: Ammonia-based aeration control (ABAC) is a cascade control concept for controlling total ammonia nitrogen (NHx-N) in the activated sludge process. Its main goals are to tailor the aeration intensity to the NHx-N loading and to maintain ...
Abstract: Process simulation is a useful tool to assist with control design and tuning at water resource recovery facilities (WRRFs). Simulation models serve as virtual WRRFs which can be used to design, tune, and test control systems. In addition, ...
Abstract: Biofilms are useful in biotechnology applications such as wastewater treatment, where aggregation of cells on surfaces can increase retention of slow-growing organisms such as ammonia-oxidizing bacteria (AOB). The formation and ...
Abstract: Combined partial nitritation−anammox (PN/A) systems are increasingly being employed for sustainable removal of nitrogen from wastewater, but process instabilities present ongoing challenges for practitioners. The goal of this study ...
Abstract: During the design of a water resource recovery facility (WRRF), it is becoming industry practice for process engineers to use simulation software to assist with the design of the plant and its aeration system. The aeration process is one ...
Abstract: Advanced process control has the ability to allow the full performance potential of your wastewater treatment plant to be realized by taking advantage of existing but unused capacities. In plants that are nearing their capacity limits this ...
Abstract: The complexity of the whole aeration system (blowers to bubbles to bulk) has been neglected for far too long in the modelling of Water Resource Recovery Facilities (WRRF). We still use simplistic basis models extended with empirical ...
Abstract: During the design of a wastewater treatment plant (WWTP), it is becoming industry practice for engineers to use simulation software to assist with process design. Aeration is one of the key components of the activated sludge process, and ...
Abstract: We present an imaging and image analysis approach to quantify both the overall morphology and the spatial distribution of nitrifying guilds in mixed-culture, nitrifying biofilms enriched on K1 carriers. For image acquisition we used ...
Abstract: A new control strategy has been developed that integrates dynamic SRT control with ammonia-based aeration control. In this strategy, feedback control of dynamic SRT is employed which is shown to provide the most appropriate means of ...
Abstract: The presented study analyzes and compares four standard aeration control concepts for air supply and air distribution in terms of energy savings, controller performance and robustness. Realistic results were achieved by the use of ...
Abstract: The metabolic processes supported in a biofilm are often determined by a biofilm’s mesoscale structure (10-4-10-2 meter scale), and mesoscale structure is in turn shaped by the interplay between microbial metabolism and detachment. ...
Rosenthal A.;Yi, J.;Zhang H.F.;Balogun O.;Wells G.;Wells G.
Abstract: This paper describes an integrated approach for designing, testing and implementing process control solutions for Water Resource Recovery Facilities (WRRFs) using a novel simulation platform. The user-friendly modeling and simulation ...
Ogurek M.;Alex J.;Rieger L.;Schraa O.;Sch?tze M.;Schutze M.