Abstract
The eye-glass polishing wastewater (EGPW) is an increasingly noteworthy problem because of its high chemical oxygen demand (COD), high turbidity and abundant microplastics (MPs), which threatens the aquatic environment as well as human life. In this study, we analyzed the separation performance of MPs from EGPW using sec-octyl alcohol and diesel oil as frother and collector, respectively. The experimental results demonstrated that the removal rate of MPs, COD and turbidity could reach to 93.9 %, 80.4 %, 83.8 %, respectively. The measurement of induction time, Fourier-transform infrared and X-ray photoelectron spectroscopy were measured to explain flotation mechanism of MPs. Sec-octyl alcohol has little effect on the functional groups of MPs and it mainly reduces the surface tension of gas-liquid interface and improves the stability of bubble. Diesel oil increases the C-C/C-H content of MPs, illustrating that it could absorb on the surface of MPs and improve the hydrophobicity of MPs. The induction time decreases with the increasing dosage of both sec-octyl alcohol and diesel oil, thus improving the separation rate of MPs from the EGPW. These results indicate that bubble flotation exhibits great potential to effectively remove MPs and purify the EGPW, anticipating to facilitate the municipal wastewater management.
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