Lee Wontae, Westerhoff Paul
HDR Engineering, Inc., 3200 East Camelback Road Suite 350, Phoenix, AZ 85018, USA.
Water Res. 2006 Dec;40(20):3767-74. doi: 10.1016/j.watres.2006.08.008. Epub 2006 Oct 4.
Coagulation of three surface waters was conducted with aluminum salt and/or cationic polymer to assess dissolved organic nitrogen (DON) removal. Coagulation with aluminum sulfate removed equal or slightly lower amounts of DON as compared to dissolved organic carbon (DOC). At aluminum sulfate dosages up to 5mg per mg DOC, the cationic polymer improved DON removal by an additional 15% to 20% over aluminum sulfate alone. At very high aluminum sulfate dosages (>8 mg aluminum sulfate per mg DOC), however, the cationic polymer addition negligibly increased DON removal. Molecular weight fractionation before and after coagulation experiments indicated that cationic polymer addition can increase the removal of all molecular weight fractions of DON with the highest molecular weight fraction (>10,000 Da) being preferentially removed. Results indicated that the DON added as part of the cationic polymer was almost completely removed at optimum aluminum sulfate and polymer doses.
使用铝盐和/或阳离子聚合物对三种地表水进行混凝，以评估溶解有机氮（DON）的去除情况。与溶解有机碳（DOC）相比，用硫酸铝混凝去除的DON量相等或略低。在硫酸铝投加量高达每毫克DOC 5毫克时，阳离子聚合物比单独使用硫酸铝时能使DON去除率额外提高15%至20%。然而，在非常高的硫酸铝投加量（每毫克DOC>8毫克硫酸铝）下，添加阳离子聚合物对DON去除率的提高可忽略不计。混凝实验前后的分子量分级表明，添加阳离子聚合物可提高所有分子量级分的DON去除率，其中分子量最高的级分（>10,000 Da）被优先去除。结果表明，在最佳硫酸铝和聚合物投加量下，作为阳离子聚合物一部分添加的DON几乎被完全去除。
