This study aimed to determine the effects of three different high molecular weight (HMW) flocculants (anionic, cationic and non-ionicflocculants) on the fine particles removal from natural stone (foid-bearing rock) processing plant wastewater at alkaline pH conditions.The test results were investigated in terms of turbidity values depending on pH of the medium, flocculant concentration and time (0–60min). According to the results obtained, the turbidity values of the wastewater in the absence of the flocculants were pH dependent anddecreased as the pH increased, resulted in the minimum turbidity values at pH 12. In the presence of the flocculants, the pH dependedturbidity removal efficiencies varied with flocculant type, flocculant concentration and time. The best results were obtained at highlyalkaline pH values (pH 12) with the turbidity removal efficiency of ≤99% in the presence of non-ionic flocculant. In the case of anionicand cationic flocculants, the minimum turbidity values were also obtained at pH 12 with turbidity removal efficiencies over 90%.
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