title: [Relationship among coagulation effect of Al-based coagulant, content and speciation of residual aluminum].
abstract: The application of AlCl3, Al2 (SO4)3 and poly-aluminum chloride (PAC) in humic acid-kaolin simulated water was studied in this article. It is intended to discuss the relationship among coagulation effect of Al-based coagulants in humic acid-kaolin simulated water and content and speciation of residual aluminum. It was found that, the turbidity removal efficiency and UV254 removal efficiency could reach about 90% at the tested dosage. At higher dosage, PAC gave better coagulation effect. The residual total aluminum content and residual aluminum ratio of PAC, which was 0.9 mg/L and - 3.0% or so respectively, were greatly lower than those of AlCl3 and Al2 (SO4)3. The residual total dissolved aluminum was the predominant content in the effluent after coagulation and sedimentation by the three Al-based coagulants. For the total dissolved aluminum, the proportion of dissolved organic aluminum was significantly higher than that of other aluminum speciation. With respect to humic acid-kaolin simulated water, the content of residual total aluminum in the effluent after coagulation and sedimentation by PAC decreased obviously compared to AlCl3 and Al2 (SO4)3. PAC could effectively decrease the content of residual dissolved aluminum speciation which has higher toxicity. The content of residual total dissolved aluminum in the effluent after coagulation and sedimentation by PAC was about 0.6 mg/L.
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji' nan 250100, China. yangzhonglian@mail.sdu.edu.cn
authors.forename: Zhong-Lian
authors.initials: ZL
authors.lastname: Yang
authors.forename: Bao-Yu
authors.initials: BY
authors.lastname: Gao
authors.forename: Qin-Yan
authors.initials: QY
authors.lastname: Yue
authors.forename: Yi-Shuai
authors.initials: YS
authors.lastname: Jiang
mesh_terms: D000534:Alum Compounds / Q000737:chemistry; D000535:Aluminum / Q000032:analysis* / Q000737:chemistry; D000077410:Aluminum Chloride; D017607:Aluminum Compounds / Q000737:chemistry*; D000536:Aluminum Hydroxide / Q000737:chemistry; D002712:Chlorides / Q000737:chemistry; D005427:Flocculation; D006812:Humic Substances / Q000032:analysis*; D007616:Kaolin / Q000302:isolation & purification; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D018508:Water Purification / Q000379:methods* / Q000592:standards; D014881:Water Supply / Q000032:analysis
chemical_list: D000534:Alum Compounds; D017607:Aluminum Compounds; D002712:Chlorides; D006812:Humic Substances; D014874:Water Pollutants, Chemical; C016213:aluminum oxychloride; D007616:Kaolin; C041524:aluminum sulfate; D000077410:Aluminum Chloride; D000536:Aluminum Hydroxide; D000535:Aluminum