Environmental Innovation Technology Research on Dredged Materials of Xiamen Bay——Content and Partitioning of Heavy Metals in Dredged Materials of Xiamen Western Bay

本论文着重研究了厦门西海域拟疏浚物中重金属的含量和赋存形态，探讨了化学试剂浸提和曝气法去除重金属的可行性，为建立后续的去污染方案提供科学依据。主要研究结论如下：（1）厦门西港海区拟疏浚物中大部分重金属的含量较均匀，低于马銮湾和筼筜湖底泥中的重金属含量。与南方珠江口、深圳湾接近，高于北方胶州湾。与国外其他港湾相比，其含量水平明显较低。（2）采用潜在生态危害指数法对厦门西海域拟疏浚物重金属污染现状进行了评价，结果表明：其潜在生态危害效应较小。（3）采用连续提取法分析了厦门西港拟疏浚物中Zn、Pb、Cu、Ni、As、Cd、Cr、Hg、Fe、Mn的赋存形态。结果表明，各重金属元素的活性态占总形态90%...Total contents and partitionings of heavy metals in tentatively dredged materials of Xiamen western bay were studied with the aim to development of conventional decomtamination technology. The main discovery could be drawn as follow: （1）The distributions of heavy metals in the sediments of Xiamen western port were average, although that from Maluan Bay and Yuandang Lake were somewhat higher. Th...学位：工学硕士院系专业：海洋与环境学院环境科学与工程系_环境工程学号：20033404

疏浚物去污染技术的研究进展

世界各国的沿海和内陆城市的河流湖泊以及海湾均需进行疏浚,而如何安全经济地处理和处置疏浚物已成为迫切需要解决的难题。目前国外对疏浚物处理技术的研究已取得了一定的成果,但大多数处理技术仍停留在实验室和中试阶段。文章综述了目前国外主要的8种疏浚物处理方法,详细地介绍和评述了各方法的原理、特点、处理效率和优缺点,并介绍了这些方法的发展动向和前景,尤其是美国在处理疏浚物方面的研究现状和进展。福建省科技重点项目(2004I001

Concentrations of heavy metals in sediments of dredged materials from Xiamen Western Harbor and assessment of potential ecological risk

报道了厦门西海域拟疏浚沉积物中的重金属含量水平及分布,并对其污染状况进行了潜在生态危害评价,为进一步开展疏浚物去污染技术研究提供了科学依据.研究结果表明:与其他海域的相比,马銮湾及其湾口外、筼筜湖的Cd、Hg、Cr、Zn含量较高.综合来看,厦门西海域拟疏浚沉积物重金属含量不很高(RI<150),属于轻微生态危害.但东渡码头外的X4站、马銮湾M2站沉积物中的Cd,及马銮湾M2站和筼筜湖Y2站沉积物中的Hg含量(40≤Er<80)都达到中等生态危害程度.Sediment samples were collected from dredging areas of Xiamen Western Harbor,and analyzed to determine the concentration and distribution of heavy metals.Results showed that the level of heavy metals in the sediments of dredging area were low,but Cd,Hg,Cr,Zn from Maluan Bay and Yuandang Lake were a little higher.Here a potential ecological risk index was used to assess the pollution effect of heavy metals.It indicated that for most heavy metals the ecological risk is light.Potential ecological risk of Cd from Dongdu Wharf(X4) and Maluan Bay(M2),Hg from Maluan Bay(M2) and Yuandang Lake(Y2) are in the middle level.福建省2004年科技重点项目(2004I001

Speciations of Heavy Metals in the Surface Sediments from Xiamen Western Harbor

采用逐级浸出法对厦门西海域6个表层沉积物样品中重金属(Cd、Cr、Cu、Ni、Pb、Zn)的赋存形态进行分析.结果表明:该海域表层沉积物中各重金属元素主要来源于人为输入的各种活性形态,自然输入的残渣态(RES)所占比例较低(10%～20%),在环境条件变化时具有向水相迁移和为水生物所利用的潜在风险性;其中Cu、Cr和Ni的赋存形态以铁锰氧化态(ERO和MRO)和有机物及硫化物结合态(OSM)为主,Pb和Cd则以碳酸盐态(CARB)、铁锰氧化态和有机物及硫化物结合态为主,Zn的各形态所占比例相对比较平均.此次研究对该海域表层沉积物中重金属的赋存形态特征有了基本了解,有助于进一步研究金属元素在近海环境中的迁移和形态转化机制.A sequential extraction procedure was employed to study the chemical speciations of heavy metals in 6 selected surface sediments from Xiamen Western Harbor.The results indicated that Cd,Cr,Cu,Ni,Pb,and Zn in the sediments were predominated(80%~90%) by the geochemically extractable forms,which mainly originated from anthropogenic sources,and least present in residual form(RES).The dominant proportion of Cu,Cr and Ni was ERO(easily reducible oxides),MRO (moderately reducible oxides) and OSM(organic/sulfide matter),and that of Pb and Cd was CARB(carbonate),ERO,MRO and OSM,whereas Zn was evenly distributed.The results of the present study help to provide a deeper understanding to the distribution pattern of such heavy metals and to undertake further research concerning transition mechanisms of pollutants in marine environment.福建省科技攻关课题(2004I001)资