The Preparation And Coagulation Property Of Polysilica Metal Coagulant And Application In Water And Wastewater Treatment

The application and research progress of inorganic polymer coagulan arediscussed in brief, and the merits and demerits of polyaluminum, polyferric andpolysilica are analysised. It can be said that the preparation research of PolymetalSilicate Sulfate (PMSS) which possess the merits of them and the research of itsapplication will be the future trends in the future. So. we carried out the followingresearch:1 The preparation and coagulation property of PASS. The coagulation property ofPASS was investigated on-line with the system of spectrophotometer and functionalrecorder. The effects of SiO₂/Al molar ratio, aging time and slow-stirring time on thecoagulation property of PASS were reflected obviously by the system. Experimentalresults show that the coagulation property of PASS improves with the increasing ofSiO₂/Al molar ratio from zero to two. PASS possesses favorable performance at theappropriate aging time because of the sweeping and adsorption action of the long-chainof polysilcic. Otherwise, the UV-spectra of PASS, Aluminum sulfate, and polysilicateand the coagulation mechanism of PASS were primary discussed. Experimental resultsshow tha the coagulation performance of PASS is better than aluminum sulfate, andthe residual aluminum and dissoluble silica are lower Using PASS, the oil-fieldwastewer was treated. Experimental results show tha PASS has bettr performancethan polyferric sulfate(PFS) and polyalumimun chloride(PAC) on removing thesuspended substance(SS) and decreasing residual iron as well as on forming bigger flocand douling sedimentation, especially at normal temperature2 The coagulation property of PFSS on oil-field wasterwater. Using water glassand ferric sulfate the coagulant PFSS was prepared by which the oil-field wastewaterwas treated. The influence of the the aging time of PFSS, the pH and temperature ofwater on the coagulation property especially on the amount of residual iron wereexperimented. The results show that PFSS has better performance than PASS PFS andPAC on removing the SS and decreasing residual iron, especially at lowet temperatUre.3 StUdy on the coagulation property of PAFSS. The coagUlan polysilicaalunilnum sulfate and fetric sulfate(PAFSS) was prepared using waer glass, aluminumsulfate and fetric sulfate. The influence of aging pH and, Fe/Al molar ratio on thecoagUlation property and stabiliZaion were experimented. Results show that they havegreat influence on the stabilization and the Fe3+can obviously increase the stabilizationof po1ysilica.4 StUdy on the coagUlation property of polymetal silicate sulfate. The ploymetalsilicate sulfate (PMSS) ware prepared, and the influences of the additive amount, agingtime, ti1e SiO,/M mo1ar ratio of PMSS, and the pH of water on its coagUlation Propertywere investigated. The mechedsm of the degree of hydrolyZation and polymerizationof metal on it property was PriInary discussed also. The resultS shOw that thehydrolyzation and polymeriZaion of metal and the strUctUre of POlysilicate has greateffect on the coagulation property of PMSS5 The CoagUlation Behedor of Polyfermus Silicate Sulfato (PFSS). Using ferrussulfate and water glass, PFSS were prePared. The influences of the proPOnion of SiO,,the additive amoun, the pH of water on the coagulation property of Fe2+ wereinvestigated, the difference of coagUlation pefformane betWen Fe2' and Fe3+ werealso discussed, and the effects of KMnO, on the coagUlation behaior of Fe+ werexPerimented. The coagUlation propeny of PFSS was inveaigated on-line with thesystem of spectrophotometer and functional recorder, and the cOagulation behavior ofPFSS was reflected obviously by the system. Othbose, and the influence mechanismof the hydrOlysis and oxidation of Fe2+on PFSS was discussed.