Arsenic and Selenium Removal From Drinking Water at a Minimal Cost

Author David Graser, Yavapai College, Prescott, AZ (


This project builds upon the Arsenic Project. In this project, students create a linear programming problem to describe how water from three wells can be combined to meet demand and meet arsenic and selenium standards. The differences from the Arsenic Project are not always picked up by students and can lead to some very interesting discussions.

  • Content Area – Finite Math
  • Time Frame – 2 to 3 weeks with mini-lectures
  • Published – October 6, 2010
  • Keywords – linear programming

Project Content

Project Letter (DOC | PDF)

Scaffolding Resources

What is Parts per Million or Parts per Billion? (PDF)


  • Demanding that at least a certain amount of water is produced impacts more than just one constraint. This is the biggest hurdle students need to overcome.