The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, College of Environment and Energy, South China University of Technology, Higher Education Mega Center, Guangzhou, 510006, China.
Guangzhou Higher Education Mega Center, Panyu District, Guangzhou, 510006, China.
Environ Sci Pollut Res Int. 2014 Feb;21(3):2122-2131. doi: 10.1007/s11356-013-2077-z. Epub 2013 Sep 13.
A novel dual coagulant system of polyaluminum chloride sulfate (PACS) and polydiallyldimethylammonium chloride (PDADMAC) was used to treat natural algae-laden water from Meiliang Gulf, Lake Taihu. PACS (Aln(OH)mCl3n-m-2k(SO4)k) has a mass ratio of 10 %, a SO4 (2-)/Al3 (+) mole ratio of 0.0664, and an OH/Al mole ratio of 2. The PDADMAC ([C8H16NCl]m) has a MW which ranges from 5 × 10(5) to 20 × 10(5) Da. The variations of contaminants in water samples during treatments were estimated in the form of principal component analysis (PCA) factor scores and conventional variables (turbidity, DOC, etc.). Parallel factor analysis determined four chromophoric dissolved organic matters (CDOM) components, and PCA identified four integrated principle factors. PCA factor 1 had significant correlations with chlorophyll-a (r=0.718), protein-like CDOM C1 (0.689), and C2 (0.756). Factor 2 correlated with UV254 (0.672), humic-like CDOM component C3 (0.716), and C4 (0.758). Factors 3 and 4 had correlations with NH3-N (0.748) and T-P (0.769), respectively. The variations of PCA factors scores revealed that PACS contributed less aluminum dissolution than PAC to obtain equivalent removal efficiency of contaminants. This might be due to the high cationic charge and pre-hydrolyzation of PACS. Compared with PACS coagulation (20 mg L(-1)), the removal of PCA factors 1, 2, and 4 increased 45, 33, and 12 %, respectively, in combined PACS-PDADMAC treatment (0.8 mg L(-1) +20 mg L(-1)). Since PAC contained more Al (0.053 g/1 g) than PACS (0.028 g/1 g), the results indicated that PACS contributed less Al dissolution into the water to obtain equivalent removal efficiency.
采用新型聚合氯化硫酸铝（PACS）与聚二烯丙基二甲基氯化铵（PDADMAC）双凝聚剂处理太湖梅梁湾天然富藻水。PACS（Aln(OH)mCl3n-m-2k(SO4)k）中 SO4(2-)/Al3+摩尔比为 0.0664，OH/Al 摩尔比为 2，Aln(OH)mCl3n-m-2k(SO4)k 中 Al 质量比为 10%。PDADMAC([C8H16NCl]m)的重均分子量（MW）范围为 5×10(5)到 20×10(5)Da。采用主成分分析（PCA）因子得分和常规变量（浊度、DOC 等）对处理过程中水样中污染物的变化进行了估算。平行因子分析确定了 4 个发色溶解有机物质（CDOM）组分，PCA 确定了 4 个综合主要因素。PCA 因子 1 与叶绿素-a（r=0.718）、蛋白类 CDOM C1（0.689）和 C2（0.756）呈显著相关。因子 2 与 UV254（0.672）、腐殖质类 CDOM 组分 C3（0.716）和 C4（0.758）相关。因子 3 和因子 4 分别与 NH3-N（0.748）和 T-P（0.769）相关。PCA 因子得分的变化表明，与 PAC 相比，PACS 贡献的铝溶解量较少，以获得同等的污染物去除效率。这可能是由于 PACS 的高正电荷和预水解。与 PACS 混凝（20 mg L(-1)）相比，在 PACS-PDADMAC 联合处理（0.8 mg L(-1) +20 mg L(-1)）中，PCA 因子 1、2 和 4 的去除率分别增加了 45%、33%和 12%。由于 PAC 中 Al 的含量（0.053 g/1 g）高于 PACS（0.028 g/1 g），结果表明，PACS 贡献的铝溶解量较少，以获得同等的去除效率。
