Enhanced coagulation in a typical North-China water treatment plant.
The characteristics of typical source waters in northern China and their enhanced coagulation features were studied in this paper. Through bench scale tests, a composite coagulant (HPAC) was selected for this kind of high alkalinity and pH water. It can be 30% more efficient in organic matter (OM) removal than the traditional coagulants (AlCl(3), FeCl(3)), and polyaluminum chloride (PACl), especially more efficient in removing high SUVA, hydrophobic and high molecular weight dissolved organic matter (DOM). It is found that some DOM with low SUVA has precedence over that with high SUVA to be removed at conventional dosages in some seasons, and that the priority of DOM removal is in the same sequence for all the coagulants. DOM with high SUVA is not always more easily removed. When applying HPAC as coagulant, flotation process can remove hydrophobic OM more efficiently than sedimentation process in pilot scale tests.
Yan
Mingquan
M
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
Wang
Dongsheng
D
You
Shijie
S
Qu
Jiuhui
J
Tang
Hongxiao
H
D000077410:Aluminum Chloride; D017607:Aluminum Compounds / Q000737:chemistry; D000536:Aluminum Hydroxide / Q000737:chemistry; D002681:China; D002712:Chlorides / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry; D005374:Filtration; D006863:Hydrogen-Ion Concentration; D008970:Molecular Weight; D010865:Pilot Projects; D015203:Reproducibility of Results; D012117:Resins, Synthetic / Q000737:chemistry; D012680:Sensitivity and Specificity; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D017607:Aluminum Compounds; D002712:Chlorides; D005290:Ferric Compounds; D012117:Resins, Synthetic; D014874:Water Pollutants, Chemical; C016213:aluminum oxychloride; D000077410:Aluminum Chloride; D000536:Aluminum Hydroxide; C046797:amberlite; C024555:ferric chloride