Thanks Matthew very much for your detailed reply, ,for your information scale mainly occur when two feeds mixed is it will be better to add acid on the mixed sterams!! Also,  i use hydrex Veolia but i inject before mixing

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Thanks Matthew very much for your detailed reply,

,for your information scale mainly occur when two feeds mixed

is it will be better to add acid on the mixed sterams!!

Also,  i use hydrex Veolia but i inject before mixing

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Hi Tamer,

Assuming the scale is in fact CaCO3 (there is still a little uncertainty on this due to some missing analysis parameters), then you'd add it to the stream containing alkalinity (HERO Reject) before mixing.  You can either destroy all the alkalinity using acid (easily calculated - just use the M-alkalinity to work out how much is required) or destroy just enough to avoid scaling (process modelling would be required to do this).  

Cheers,

Matt.

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