ABSTRACT

The aim of this study was to evaluate changes in lead and chromium amounts in sequentially separated fractions and available forms of four sewage sludge (SS). Lead and chromium sequential extraction in SS was performed using BCR method. Single extractants were used to assay available and bioavailable forms of metals. It was found that Pb and Cr were detected in the largest amounts in organic forms, while the lowest levels were recorded for exchangeable ones. Sewage sludges from the small installations contained significantly lower amounts of metals (both available, bioavailable and sequentially separated fractions of sewage sludge) in comparison with those originating from the large treatment installations. Generally amounts of metals detected in sewage sludge were small in the years of this study, which should be considered a positive trend. Additionally, the bioavailability index (φ) and risk assessment code (RAC) indicated no negative impact of metals contained in the analysed SS on the soil environment.

摘要

本研究的目的是评估依次分离的馏分和四种污水污泥（SS）可用形式中铅和铬含量的变化。使用BCR方法在SS中进行铅和铬的顺序萃取。单一萃取剂用于分析金属的可用形式和生物利用形式。发现以有机形式检测到的铅和铬含量最高，而可交换的含量最低。与来自大型处理设施的污泥相比，来自小型设施的污泥所含的金属量（可利用的，可生物利用的和依次分离的部分污水污泥）明显减少。通常，在本研究的年份中，在污水污泥中检测到的金属量很小，应该认为这是一个积极趋势。