Colloidal silica removal in coagulation processes for wastewater reuse in a high-tech industrial park

S. H. Chuang, T. C. Chang, C. F. Ouyang, J. M. Leu

研究成果: 書貢獻/報告類型篇章同行評審

31 引文 斯高帕斯(Scopus)


Four experiments of coagulation and flocculation were conducted to investigate the characteristics of colloidal silica removal in a high-tech industrial wastewater treatment plant for reclamation and reuse of the effluent. Experimental results illustrated that poly-aluminium chloride (PACI) showed higher performances on colloidal silica removal than alum. Interestingly, the two coagulants demonstrated the same capacity on silica removal. The specific silica removal capacity was approximately 0.135 mg SiO2/mg Al2O3 when the dosage of coagulants was in the range 30-150 mg/L Al2O3. In addition, the silica was reduced significantly at the condition of pH above 8. Experimental data implied that precipitation of aluminium flocs was the major mechanism for colloid silica removal in PACI and alum coagulation, besides, charge adsorption was also important for improving removal efficiency. Moreover, the addition of polyacrylic acid (PAA) as a flocculant could slightly advance silica removal in the PACI coagulation. The combined PACI/PAA/flocs coagulation was effective for the removal of colloidal silica, soluble COD, and turbidity and also suitable as a pretreatment unit in wastewater reclamation and reuse processes.

主出版物標題Wastewater Reclamation and Reuse for Sustainability
編輯I.S. Kim, S. Kim, J. Cho
出版狀態已出版 - 2007


名字Water Science and Technology


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