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Did you ever try the electrical current method for sedimentation enhancement? Some 30-odd years ago when I had a tailings pond type of problem this was one of the solutions that seemed possible. We ended up doing something else so I never really chased it down very far, but it has always stuck in my mind as a possible answer.
Yes yes we did look at this. I forgot about this, you looked too eh! I remember some of the problems (just) variable resistivity in the mineral attachments on the clay particles causes reflective characteristics, so total turbidity (ntu) results were not good on thier testing. Secondly, did you guys have Ph problems? we did at the begining of the test trial period. But additional powder solved it, but I don't remember the powder. The Eng'rs determined evaporation was cheapest. yet the settling can take 70yrs or more, so they hoped for warm summers.
Our biggest problem is filtration of the majority of the clay fines, every 8hrs bags need changing.