Dynamic light scattering application in the treatment of wastewater contaminated with printing ink particles through coagulation-flocculation process

The effluents discharged from the industrial printing units contain micro, and nano-scale ink particles which are frequently uncharged. The stability of suspended particles in these wastewaters causes the pollution of water resources, and soil. The high concentration of ink in the mentioned wastewaters creates significant problems for the separation processes. Coagulation-flocculation is one of the most efficient methods for the treatment of thick effluents. Therefore, in the current investigation, an industrial wastewater discharged from the printing unit was treated in the presence of magnesium chloride. Dynamic light scattering and zeta potential data were used to characterize the particle stability in the wastewater and the effluents treated by coagulation-flocculation process. The results of the experiments showed that the presence of magnesium chloride, ۱۰.۰ g L-۱, in the alkali condition leads to achieve a separation efficiency ۸۲ %. Also, the time required to settle the flocculated particles is ۴۰ min.

کلیدواژه ها:

Wastewater ، Printing ink ، Coagulation-flocculation ، Dynamic light scattering ، Zeta potential