Mr. Samstag was an early adopter and creator of biological treatment models. In the mid-1980s Mr. Samstag authored the biological model, Treat©, which simulated seven different wastewater treatment organisms. Treat© was written in an early version of Microsoft Visual Basic. Over the years he has authored other biological treatment models, including Biotank©, a Fortran model which simulates dissolved oxygen control in activated sludge tanks and TFSG©, a model of the trickling filter suspended growth hybrid; a companion model to Treat©, written in Visual Basic. For over ten years Mr. Samstag has used the commercial treatment analysis software, BioWin®, and currently holds an active license to BioWin® and its companion Controller® program. Mr. Samstag has used Desdata©, initially developed by him 30 years ago and continuously updated since, for process sizing and cost evaluation on many projects.
Various projects: process evaluation and tank sizing evaluation – For a series of wastewater treatment plants, ranging in size from 0.5 to 215 million gallons per day (1,900 – 815,000 m3/day) capacity, Mr. Samstag has developed process sizing evaluations and process calculations to establish process type, tank, and equipment size. Recent projects have included evaluation of nitrogen removal alternatives for the 60 mgd (227,000 m3/day) Tacoma Central Treatment Plant for the City of Tacoma and the 215 mgd (815,000 m3/day) West Point and the 144 mgd (545,000 m3/day) South Treatment Plant for King County (Seattle); evaluation of trickling filter activated sludge and aerated and oxidation ponds for the 30 mgd (114,000 m3/day) Everett WWTP; evaluation of nitrification capability and sizing of membrane bioreactors for upgrade of the 30-mgd (114,000 m3/day) capacity Modesto, California WWTP.
A list of some of Randal’s biological treatment modeling projects follows.