my suggestion is to separate ...

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my suggestion is to separate as much as possible suspended solids before coagulation and flocculation proces then use calcium hydroxide to rise the ph to 9-9,5, alumium sulphate as coagulant and anionic polielecrtolite as flocculant.

we have experieced succesfully this proces in a tannery that produce hides treated with tannins.

regards

 

Marco Vallero