The Study On Development And Application Of Compounded Coagulant CD

Water resource lack and pollution make water treatment technology more and more important, and coagulation is one of these technologies used widely, and coagulant is very important So the key problem of coagulation is to research and explore high efficiency and low consumption coagulant This article summarizes the category and development of the coagulant and introduces the development of the inorganic coagulant, put forward the research contentThe compound coagulant CD belongs to inorganic and macromolecular coagulant, cotaining aluminium and ferric and including both of their virtues. Through tests , the influence from synthesized time, the value of pH, and electropositive for coagulant are researched. and the optium ratio of the new compounded coagulant CD is 70g raw material (aluminum ore : aluminate calcium to is 3 : 4) : 100mL hydrochloric acid (concentration is 26%) : 2gFeCl₃ ? 6H₂O; the optium time is 2 hours, the optium value of pH is 4.0, the optium electropositive is 80%.The coagulant CD is compared with PAC,PFS, the coagulant effect and remove oil ability also are better .than the another two When the same effect was attained, the dosage of CD is smaller than the other two The use of the assisting coagulant can improve the coagulation effect, and cation assisting coagulant fits the CD coagulant,.through the coagulant tests and kinetics, the optium conditions are chosen , the optium dosage is 150mg/L,the value of pH range is 6⁹,the temperature range is 5℃³0℃, fast stirring velocity and time is 300r/min and 2min separately ,low stirring velocity and time is 125r/min and 1min separately.The infrared spectrum improves coagulant is macromolecular polymer; the coagulation mechanism of coagulant CD is electric charge neutralization and adsorption and bridging of macromolecular polymer.This article research the application and economic value. For the printing and dyeing waste water, it's the maximum removal ratio of COD and chroma were separate 71% and 85%;for paper making waste water , it's the maximum removal ratio of COD and chroma were separate 85% and74%;the turbidity of the high turbidity water can be decreased from 368NTU to 8NTU. So the above examples indicates the applicable value of coagulant CD. For oil wastewater in experiments, the price is 0.15yuan per ton ,and less 0.16yuan per ton and 0.12yuan per ton than PFS and PAC. Those show that coagulant have the value for use and recommend.