Removal Of Suspended Solid Materials From The Wastewater Of Natural Dimension Stone Cutting Plants By Flocculation

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Beykent Üniversitesi

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During the processing of natural dimension stones (NDS), the wastewater produced is either re-used in the process or discharged into the aquatic environment. The suspended solids must be removed from the effluent prior to re-using or discharging into environment. In order to remove the fine particles, large basins are needed to provide sufficient retention time due to the extreme low settling velocities, therefore, organic polymers (flocculants) have to be added to increase the settling velocity and the efficiency of settling basins. In this study, flocculation characteristics of NDS namely marble, granite and basalt were investigated using three commercial flocculants such as anionic (A-110), cationic (C-592) and non-ionic (N-100 plus). The primary particle properties such as particle size, size distribution as well as their dispersion properties like solid concentration, suspension pH and zeta potential on settling rate and supernatant concentration in solids have also been considered. Results showed that among the three different flocculants tested, anionic flocculant for marble sample; cationic flocculant for granite and basalt samples gave the best result. The flocculant dosage affected significantly the settling rate of the suspension as well as the clarity of the supernatant. The anionic A110, flocculant with 3 mg/L dosage showed the optimum performance for marble suspension while the cationic C592 flocculant with 4 and 3 mg/L dosage found enough for granite and basalt suspensions, respectively.


Anahtar Kelimeler

Dimension stone, marble, basalt, granite, removal of suspended solids, flocculation


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Journal of Science and Technology 1 (2), 2007, 234-244