Simultaneous removal of fluoride and organic matters from coking wastewater by coagulation [FeCl3和AlCl3协同絮凝去除焦化废水中氟和有机物]

作者：Liu M.; Li S.; Sang H.; He L.; Xu L.; Yu W.^*

来源：Chinese Journal of Environmental Engineering, 2020, 14(8): 2048-2056.

DOI：10.12030/j.cjee.202005178

• Coagulation
• Coking wastewater
• Fluoride
• Organic matters

Fluoride is a predominant contaminant to be removed from coking wastewater. Here, we used AlCl3 and FeCl3 as coagulants, investigating the removal of fluoride and organic matters from coking wastewater, accompanied by exploring the effect of pH and coagulant dosage on the removal efficiency. The results suggested that the best fluoride removal efficiency for AlCl3 and FeCl3 were 94.4% and 27.3%, respectively. At dosage of 20 mmol?L-1, the removal efficiency of total organic carbon (TOC) for FeCl3 and AlCl3 were 27.6% and 23.9%, respectively. Therefore, AlCl3 has greater potential to remove fluoride, while FeCl3 exhibited higher removal efficiency of organic matters. The addition of Ca2+ had some positive effects on fluoride removal, even though decreased the removal efficiency for organic matters. Besides, the performance of Al-Fe combined coagulant was also studied by investigating the effects of pH and Al/Fe ratio on the removal efficiency of fluoride and organic substances. It is suggested that the optimal working condition for the removal of these matters was achieved with the pH of 6.5 and the Al/Fe ratio at 8:2. In this study, the mechanism of FeCl3 and AlCl3 for the removal of fluorine and organic matters in coking wastewater was explored, and the results can provide reference for the advanced treatment of coking wastewater.

• 单位
  中国科学院大学