Study On The Properties And The Algal-removal Application Of PAFC

The basic properties of the polymeric aluminum-ferric chloride (PAFC), which is a new efficient inorganic coagulation, was studied, and with the Ma-cang lake?Mo-shui lake and Si-mei pond etc eutrophic waters, the coagulation trials was proceeded, and the mechanism of the algal-removal by coagulation was summarized in this paper.The study on the properties of the PAFC shows that in the aluminum-ferric co-existence and co-polymerize system, the hydroxyl-ferric ratio (BFe =[OH-]/[Fe3+]), which can unify the aluminum-ferric ratio and the basicity (5), has important effect on the properties of the co-polymerized PAFC. The conclusion shows that the morphological characteristics and translating rule of the PAFC is mostly decided by the hydroxyl-ferric ratio. And according to the new views, the hydroxylation process of the PAFC was expounded.The traditional Al-Ferron colorimetry was improved reasonably, which increases the efficiency of assaying with accuracy; According to the Al-Ferron assaying process, a newmathematics simulation method-power function was adopted, and the new standards tothe morphological species of coagulation was put forward, and the reasonable hypothesis what the index of the power function represents was given. With the new assay, the morphological species of the PAFC solution was mensurated, and the morphological mathematical model of the stabile PAFC solution was gained.The morphological species of the borated PAFC shows that the borate has the function of basicity and dispersion in the aluminum-ferric co-polymer. The trials of coagulation show that the more the ferric content is, the more the degree that the borate improves the capability of algal removal of PAFC is.The mechanism of algal-removal by coagulation can be concluded that the capability of algal removal by coagulation is firstly influenced by the monomer Ma, which has the function of compressing the electric double layer and absorption electrical neutralization, and mostly influenced by the absorption-bridge function of the polymer Mb, and also influenced by the properties of the aluminum and ferricion?the algal shape?the dosage of the coagulant, and so on.