中文摘要：

通过试验方法考察了2种不同底泥改良剂（铝和锆改性沸石）对太湖底泥-水系统中SRP（可溶解性磷酸盐）的固定作用.改性沸石改良前后太湖底泥对水中较高浓度磷的吸附平衡数据可用Langmuir和Freundlich等温吸附方程进行描述,吸附动力学过程可用准二级动力学模型进行描述.太湖底泥、铝和锆改性沸石改良太湖底泥的最大磷吸附量分别为395、613和1 009mg/kg.被改良太湖底泥中,铝改性沸石所吸附的磷主要以NaOH-rP（NaOH提取态磷）形态存在,锆改性沸石所吸附的磷主要以NaOH-rP和Res-P（残渣态磷）形态存在.当水中初始ρ（SRP）很低时,太湖底泥和改性沸石改良太湖底泥均释放出磷,其中后者的释磷量较低.改性沸石改良太湖底泥中的w（BAP）（BAP为生物有效磷）低于太湖底泥,w（liable-P）（liable-P为弱吸附态磷）也明显偏低.铝改性沸石改良太湖底泥中的w（BD-P）（BD-P为氧化还原敏感态磷）与太湖底泥相比差异不显著,而锆改性沸石改良太湖底泥中的w（BD-P）明显低于太湖底泥.可见,铝和锆改性沸石均可用于控制太湖底泥磷的释放,其中锆改性沸石的控制效果更好.

英文摘要：

Adding sorbents to sediments has been suggested as an effective technology for contaminated sediment remediation. In this study, two types of modified zeolites, including aluminum-modified zeolites （A1MZs） and zirconium-modified zeolites （ZrMZs） were prepared and used as sediment amendments to control the release of phosphorus （P） from Taihu Lake sediments. The sorption of phosphate-P from Taihu Lake sediment-water systems on A1MZs and ZrMZs was investigated through a series of experiments. The Langmuir and Freundlich isotherm models were found to be quite useful to describe the sorption equilibrium data of P on the raw and amended sediments at a high initial P concentration （ 1-10 mg/L）. The sorption kinetics of phosphate on the raw and amended sediments followed a pseudo-second-order model. Based on the Langmuir isotherm model, the maximum phosphate-P sorption capacities for the raw, AIMZs-amended and ZrMZs-amended sediments were 395, 613 and 1009 mg/kg, respectively. Sequential extractions of P from the raw and amended sediments after phosphate sorption indicate that most of phosphate sorbed by A1MZs existed in the form of NaOH-rP （P extracted with NaOH） , and most of phosphate sorbed by ZrMZs existed in the forms of NaOH-rP and Res-P （residual P）. Phosphate- P could be released from the raw and amended sediments at a very low concentration of P in water. The amount of phosphate-P released from the modified zeolites-amended sediment was less than that from the raw sediment. The contents of bioavailable P including water-soluble P （WSP）, readily available P （RDP）, NaHCO3- extractable P （olsen-P） and algal-available P （AAP） in the sediments reduced after the sediments were mixed with AIMZs or ZrMZs, making P in the sediments more stable. The content of liable-P （P extracted with NH4C1） in the modified zeolites-amended sediment was less than that in the raw sediment. The content of BD-P （P extracted with bicarbonate dithionite） in the raw sediment was higher than th