Advance you knowledge of Water/Wastewater Mathematics!

Advance you knowledge of Water/Wastewater Mathematics!

Free online sources available to you:



Specific example of education:

Based on the information below; calculate the WAS pump rate in GPM?

An activated sludge process has three aeration basins.  Each basin is 90 feet long, 45 feet wide, and 12 feet deep. The MLSS concentration is 2,750 mg/L.  There are two clarifiers.  Each clarifier is 36 fee tin diameter and 11 feet deep. A clarifier core sample indicates that the solids concentration in the clarifier is equivalent to 500mg/L.  If the RAS/WAS concentration is 5,950mg/L, find the WAS pumping rate in GPM if the pump operates 17 minutes out of each hour to maintain a sludge age of 15 days.

Other detailed education:

Conversions, Calculate Volume & Poundage and etc.


Environmental Services by Daniel L. Theobald

PO Box 80610 | Simpsonville, SC 29680-0610

Toll Free: 1-866-815-7819


Web Site:




Daniel L. Theobald of Environmental Services:


Known in the industry as “Wastewater Dan,” Daniel L. Theobald, proprietor of Environmental Services, is a professional wastewater and safety consultant/trainer. He has more than 24 years of hands-on industry experience operating many variants of wastewater treatment processing units and is eager to answer submitted questions on water or wastewater and to share his knowledge about water conservation.




Theobald serves as an active consultant for industries looking to achieve and maintain improved wastewater treatment at reduced cost. He is a Lifetime Member of the Who’s Who Registry of Professionals and holds numerous certifications from wastewater management regulatory boards and professional organizations. Theobald contributed one chapter to the Water Environment Federation’s Manual of Practice # 37, a technical manual resource guide for biological nutrient removal, scheduled and published in 2013.




Theobald also authors an industry-related blog






Web (Linkedin-Dan’s Personal Profile):    




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