• Math Solutions Explained: Calculate Food-to-Microorganism (F-M) Ratio

    The food-to-microorganism (F-M) ratio is a process control numeric value advantageous to determine the proper number of microorganisms for the biological treatment process. The solution of calculating F-M ratio uses the influent volume of wastewater into an activated sludge system (flow MGD), incoming carbonaceous biochemical oxygen demand (CBOD) (mg/L) concentration into the aeration tank, mixed liquor volatile suspended solids (MLVSS) concentration (mg/L), and quantity (in gallons) of the respective aeration system.

  • Math Solutions Explained: Converting To Gallons Per Minute

    This presentation will focus on converting and expressing flow rate gallons in minutes, converted from flow rate gallons in hours.

  • Math Solutions Explained: Biochemical Oxygen Demand (BOD) mg/L

    Water Online’s “Math Solutions Explained” series, presented by wastewater consultant and trainer Dan Theobald (“Wastewater Dan”), educates operators by explaining BOD mg/L calculations.

  • Math Solutions Explained: Pipe Volume Gallons

    Water Online’s “Math Solutions Explained” series, presented by wastewater consultant and trainer Dan Theobald (“Wastewater Dan”), educates operators by explaining pipe volume gallons calculations.

  • Benefits Of Remote Access To Primary Wastewater Treatment

    A real-world, industrial application of remote process monitoring proves that a little technology can go a long way in terms of cost savings and process improvement.

  • Math Solutions: 10 Most Popular Step-By-Step Procedure Calculation Videos Of 2017

    With almost 30,000 total views in 2017, the “Math Solutions” series of tutorial videos from wastewater consultant and trainer Dan Theobald ("Wastewater Dan") has offered plenty of guidance to treatment plant operators. Here are the lessons that drew the most attention.

  • Math Solutions: Flow Velocity Calculations

    Flow velocity is defined in fluid dynamics as the specific distance (feet, yards, or miles) fluids such as water and wastewater travel in an exact period of time including seconds, minutes, or hours. In managing your water/wastewater, applying this tool can be very useful.

  • Math Solutions: Helpful Math Hints And Calculations

    Mathematical calculations can be a challenge for even the most skilled water and wastewater operator. The formulas for chemical dosing, conversion, filtration, pounds, velocity, volume, and other everyday problems vary, of course, but there are a scant number of basic ground rules that can help make sure your math solution is legitimate regardless of the calculation you’re performing.

  • Math Solutions: Certification Examination Prep Calculations

    While it is natural to be worried about the unknown, being apprehensive can lead to less achievement. Conversely, knowing what to expect more likely leads to relaxation and accomplishment — and can ultimately help you pass the exam.

  • Math Solutions: Energy Dollar Savings Calculations

    Energy efficiency, as defined in wastewater treatment, is using less energy to provide the same service. It can be expressed as energy dollar savings by replacing older, inefficient motors.

  • Math Solutions: Hydraulic Loading Calculations

    This tool for operators, represented through video tutorials, offers mathematical templates to master the hydraulic loading gallons per day per square foot by evaluating the incoming flow and surface area.

  • Math Solutions: Alkalinity Calculations

    We know the importance of pH to biological wastewater treatment, but alkalinity should be considered equally important for its direct correlation to pH.

  • Math Solutions: Mixed Liquor Volatile Suspended Solids (MLVSS) Calculations

    Wastewater consultant and trainer Dan Theobald (“Wastewater Dan”) dives deeper into the activated sludge process with calculations focused on MLVSS.

  • Math Solutions: Sludge Age Process Control Calculations

    “Wastewater Dan” helps operators solve for sludge age and optimize the activated sludge process using sample problems and easy-to-use math templates to inform real-world calculations.

Wastewater Dan Theobald

Daniel Theobald


Daniel L. Theobald, “Wastewater Dan” The WastewaterWizard Principal at TheWastewaterWizard.com