Wastewater Library Summary of State Operator Certification ProgramsDetailed look at each state’s Water Operator certification programs. Activated Sludge Process ControlMichigan – Training manual for wastewater treatment plant operators. ABC Wastewater Formula Sheet Share this page:Click to share on LinkedIn (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Pinterest (Opens in new window)Click to print (Opens in new window)Click to email a link to a friend (Opens in new window)