HPO Wastewater Simulation

UNOX & OASES System Simulation Software

High-Purity Oxygen wastewater Simulation Software

DWG ASSOCIATES not only understands high-purity oxygen (HPO) wastewater technology, we can model it and we can simulate it.  Our simulators are accurate, realistic, and specifically developed to mimic HPO wastewater treatment plants.  That means a covered, staged aeration basin where the feed gas and mixed liquor flow concurrently through the reactor.

For more than 25 years, DWG ASSOCIATES’ wastewater simulation software has been the only user friendly wastewater treatment plant simulation software that truly replicates high-purity oxygen (HPO) covered aeration basins and oxygen generation systems.  DWG ASSOCIATES has been developing HPO treatment plant software since the 1990s.  And before that, members of our staff wrote the HPO process design software that has been (and still is) used to design virtually every UNOX or OASES HPO secondary system in the world.  Our first plant simulators were used in the early 1990s to provide a simulated "hands-on" operating experience for attendees at DWG ASSOCIATES’ operator training courses given in conjunction with the Georgia Institute of Technology in Atlanta, Georgia, USA.  Our understanding of HPO wastewater treatment and oxygen supply will assure that you will never have to scratch your head and wonder if a diffused-air BioWin model really simulates your covered HPO tanks with their elevated oxygen purities.

Like all simulators, ours are used for plant design, plant troubleshooting, plant optimization, operator training, and for all manner of "what if" operating scenario analyses.  We’ve got simulators for HPO aeration basins, PSA oxygen generation systems, and cryogenic oxygen generation systems.  Our simulation capabilities allow us to analyze your secondary system without interrupting actual plant operations; oftentimes from an off-site remote location. And our understanding of your control system and how it affects optimum operation will ensure you that the answers we generate are backed by years of working with your specific HPO technology.

Our Simulators



HPODesign© is a high-purity oxygen wastewater treatment plant design simulator.  DWG ASSOCIATES uses this simulator for design and/or plant evaluation & troubleshooting purposes.  HPODesign© (and its predecessor versions) has been used by various organizations to design every HPO plant in the world.  For plant evaluation & troubleshooting purposes, DWG ASSOCIATES’ personnel can rapidly calibrate the software so that it mimics the operation of your (or any) operating, covered HPO facility.  Once calibrated, our experts can work with your staff to optimize, troubleshoot, or upgrade your plant.  With a calibrated simulator, our engineers are able to work with your staff either on your site or from remote locations, if that’s necessary, to resolve operating & optimization issues or questions as they arise.  If you’re interested in cost minimization, that’s as cost effective as it gets!



PSASim© is a PC-based process simulator that mimics the operation of 3-bed, Union Carbide-type Pressure Swing Adsorption (PSA) oxygen generators.  PSASim© is a functional model of the PSA oxygen generation plants typically found at high-purity oxygen (HPO) wastewater treatment plants.  The simulator assists with troubleshooting, evaluating, and optimizing operating PSA oxygen generators using either the old 5A or the relatively newer, more prevalent 13X molecular sieve.  PSASim© is an invaluble tool for analyzing the operating efficiency of an operating PSA plant.



CryoSim© is a process simulator that replicates the operation of cryogenic oxygen generation plants.  Specifically, CryoSim© replicates Union Carbide U-type and Air Products & Chemicals RHX oxygen cryogenic plants, which are the two types of cryogenic plants typically found at high-purity oxygen (HPO) wastewater treatment plants.  With CryoSim© it's possible to determine the limitations (e.g., max. liquid oxygen making capabilities or turndown limit) and efficiencies of an operating plant without actually disrupting the operation of the physical plant.