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In Spring 2013, we determined that aluminum coagulants may be just as effective as iron salts for arsenic removal. We also have researched the lab safety protocols for dealing with arsenic in the AguaClara lab, and believe we can begin testing coagulants next semester. Below is a list of questions we suggest next semester's team continue researching. We've also included a task list in our final report detailing how to get the lab arsenic ready and a potential experimental setup to test arsenic coagulation.
Future Research
- Which coagulant, Fe(Cl)3, alum, or PACl is better at removing arsenic?
- Is arsenic removal limited by the mass transfer of arsenic to a precipitated coagulant surface, or by capture of the precipitated coagulant by plate settlers and filters?
- Would a floc blanket formed from coagulant precipitate enhance arsenic removal?
- Does addition of a small amount of clay enhance flocculation and arsenic removal?
- How can we reduce the amount of coagulant loss to the reactor walls? (contact chamber, clay)
- What is arsenic removal correlated with? What is the limiting factor?
- Due to the geometry of arsenic flocs, should we consider a coagulation-filtration system rather than attempting flocculation and sedimentation?
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Documents | Challenges | Tasks | Teach-In | Presentation | Final Report | Fall '13 |  | | | | | Spring '13 | | | Image Modified | |
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