Polymerization of Silica in Water-Effect of Ultrasonic Waves on Coagulation and Sedimentation

Iranian Journal of Chemistry & Chemical Engineering

Hossein Salavati¹  Nezameddin Daneshvar¹ 

[1] Faculty of Chemistry, Tabriz University, Tabriz, I.R. IRAN;

关键词: silica polymerization;    silica colloidal particles;    ultrasonic waves;    coagulation;    sedimentation;    flocculation;    filtration rate;    nephelometry;   

DOI  :  

来源: DOAJ

【 摘 要 】

Polymerization rates of silica at various concentrations and pHs have been studied via nephelometry. The ability and potency of ultrasonic radiation on the coagulation process in aqueous samples with and without silica colloidal particles have been extensively investigated. Factors affecting the rate and filtration volume such as silica concentration, time of radiation, temperature, and frequency of radiation have also been studied. The results indicate that ultrasonic radiation has two folded effect: on the one hand it breaks down the large flocs and on the other it results in the flocculation of small particles. The above mentioned effects lead to a reduced uniformity coefficient for the filter beds made of such coagulated particles.

【 授权许可】

Unknown