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- 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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