Study On The Preparation Of Nano-oxides Composited With PAM Flocculant And Its Application In Petrochemical Wastewater Disposal

Nano-technology is the most popular technology in recent years, and it has penetrated intomost subject fields. The high efficiency nano-composite flocculant is synthesized using nanomaterialunique characteristics of high surface area and strong adsorption performance.The four key factors of monomer concentration, initiator content, reaction time andreaction temperature are analyzed through orthogonal experiment. the best conditions ofsynthesis of polyacrylamide are : monomer concentration of 25%, initiator (kaliumperoxodisulfate) concentration of 0.02%, reaction time 6h, the reaction temperature 20℃.On the above best experimental conditions, three nano-oxides of TiO₂, SiO₂ and Al₂O₃ areapplied to synthesize with acrylamide monomer. Utilizing a Kaolin suspension as a simulatedwastewater, the impacts of the amount of coupling agent KH570 and the addition of nanooxideson the flocculation effect of Kaolin suspension are investigated. By comparison, theeffect of SiO₂ is the best, TiO₂ second, and Al₂O₃ is the worst. This may be due to the surfacearea of nano-oxides. The SiO₂ surface area reaches 640 m²Â·g^-1, the TiO₂ surface area of 210m²Â·g^-1, and Al₂O₃ surface area is only 180 m²Â·g^-1. The greater the surface area is, the strongerthe nano-oxide adsorption capacity is, and the better the flocculation results will be.Through IR Spectrum and SEM Micrograph analysis of Nano-SiO₂ and Nano-SiO₂Dispersing in PAM,the nano-composite flocculant is synthesized successfully.The nano-composite flocculant is used to treat the waste water from Shenghua oil refineryand heavy oil refinery. The flocculation results show that:the nano-composite PAM exhibitsa quicker flocculating rate and a better removing property than ordinary PAM,especially, thecomposite PAM demonstrates to have the excellent property of resisting degradation.