Comparative study of six different sludges by sequential speciation of heavy metals
Comparative study of six different sludges by sequential speciation of heavy metals
复制标题
DOI：
10.1016/j.biortech.2007.01.025
复制
发表时间：
2008-02-01
影响因子：
11.4
通讯作者：
Meseguer, Victor F.
中科院分区：
文献类型：
--
作者：
Fuentes, Ana;Llorens, Mercedes;Meseguer, Victor F.
废水处理厂产生的污泥中存在重金属，限制了其农业用途。这项研究着眼于不同类型的污泥（好氧，厌氧，不稳定，污泥从废物稳定池，污泥从延长曝气厂和热处理污泥），并比较了重金属的分布与处理，他们已经经历。此外，金属（镉，铬，铜，钙，钾，铁，镁，镍，钠，铅和锌）的总量和一些必要的农艺参数表征污泥作为合适的修正案。采用BCR法进行重金属形态分析。主成分分析（PCA），以获得更多的信息，在污水污泥中的金属形态。经证实，重金属的浓度没有超过欧洲立法规定的限度，污泥所经历的稳定化处理强烈影响了重金属的分布和它们所关联的相。废物稳定池污泥，它经历了比其他更高程度的矿化，显示出较低的金属生物利用度指数，因为几乎所有的重金属在它是相关的可氧化和残留部分。另一方面，不稳定的污泥，其中，沿着，暴露于延长曝气，含有最高的积累的重金属在最容易同化的部分。(c)2007爱思唯尔有限公司保留所有权利。
The presence of heavy metals in the sludges produced in wastewater treatment plants restricts their use for agricultural purposes. This study looks at different types of sludge (aerobic, anaerobic, unstabilised, sludge from a waste stabilisation pond, sludge from an extended aeration plant and heat treated sludge) and compares the distribution of heavy metals with the treatment that they have undergone. In addition, the total quantity of metals (Cd, Cr, Cu, Ca, K, Fe, Mg, Ni, Na, Pb and Zn) and some agronomic parameters necessary for characterising a sludge as suitable for use as amendment were determined. The BCR method for heavy metal speciation was followed. Principal component analysis (PCA) was applied in order to obtain more information about metal speciation in the sewage sludges. It was confirmed that the concentration of heavy metals did not exceed the limits set out by European legislation and that the stabilisation treatment undergone by the sludges strongly influenced the heavy metal distribution and the phases to which they were associated. The waste stabilisation pond sludge, which has undergone a higher degree of mineralisation than the others, shows a lower metal bioavailability index since practically all the heavy metals in it are associated to the oxidisable and residual fraction. On the other hand the unstabilised sludge, which, along with that exposed to extended aeration, contains the highest accumulations of heavy metals in the most easily assimilable fractions. (c) 2007 Elsevier Ltd. All rights reserved.