Abstract
In waste water, impurities are present as suspended solids or dissolved substances Usually for the treatment of fine suspended solids and microorganisms residues after biological processing, organic or inorganic flocculants are added to fasten the settling velocity of particles through the formation of large flocs. However the sediments obtained with organic flocculants have a high moisture content, and the use of inorganic floc-culants is restricted because of the tendency of flocculant ions to remain into the clarified water. To overcome these problems, authors have been studying the development of a new method of waste water treatment by the hetero-flocculation with fluorite. In the present study, the effect of fluorite as solid flocculant has been investigated using waste water containing clay, organic matters and microorganisms. A suspension of fluorite was more effective for the treatment of clay waste water. In the cases of waste water containing organic mat-ters and microorganisms, a remarkable hetero-flocculation was observed when these waste waters were diluted to 8000 and 3500 mg/l, respectively. The dehydration can be easily carried out for each waste water
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