Particle-particle interaction in water treatment：role of coagulant speciation and hydrolysis kinetic on NOM removal
The mechanism of natural organic matter(NOM)removal by AlC13 and polyaluminum chloride(PACl)was investigated through bench scale tests.The fraction distributions of NOM and residual Al after coagulation in solution,colloid,and sediment were analyzed as changes of coagulant dosage and pH.The influence of NOM,coagulant dose and pH on coagulation kinetics of AlCl13 was investigated using photometric dispersion analyzer compared with PACl.Monomefic Al species(Al3)shows high ability to satisfy some unsaturated coordinate bonds of NOM to facilitate particle and NOM removal.while most of flocs formed by Ala are small and not easily settleable.Medium polymerized Al species(Alb)can destabilize particle and NOM efficiently,while some flocs formed by Alb are not as large and precipitative as those formed by colloidal or solid Al species(Alc).Alc could adsorb and remove NOM efficiently.The removal of contaminant by species of Ala,Alb and Alc follows mechanisms of complexation,neutralization and adsorption,respectively.Unlike preformed Alh in RACl,in-situ formed Alb can remove NOM and particle more efficiently via the mechanism of further hydrolysis and transfer into Alc during coagulation.While the presence of NOM would reduce Alb formed in-situ due to the complexation of NOM and Ala.
Dongsheng WANG Mingquan YAN Jiuhui Qu Christopher W.K.CHOW
SKLEAC,Research Center for Eco-Envir.Sci.,CAS,POB 2871.Beijing 100085,China SKLEAC,Research Center for Eco-Envir.Sci.,CAS,POB 2871.Beijing 100085,China;Dept of Envir.Eng.,Pekin CRC for Water Quality and Treatment,AWQC,SA Wlater,Private Mail Bag 3,South Australia 5108
国际会议
西安
英文
85-87
2008-05-15（万方平台首次上网日期，不代表论文的发表时间）