Sorption of organic pollutants frequently detected in stormwater: evaluation of five potential sorbents

Adsorption filtration is one of the most promising techniques for removal of dissolved, colloidal and particulate pollutants from stormwater. The aim of this study was to compare the capacity of five filter materials - cellulose, chitosan, chitosan-covered bark, pine bark and polypropylene/polyethylene (PP/PE) fibres - to sorb organic pollutants frequently detected in stormwater, including polycyclic aromatic hydrocarbons (PAHs), alkylphenols and phthalates. In batch tests, synthetic stormwater spiked with a mixture of the organic compounds was contacted with the materials for up to 24 h. The compounds were then liquid-liquid extracted and analysed using GC-MS. Cellulose and chitosan showed very low sorption capacity for the organic contaminants, whereas >70% of the initial concentration of most tested compounds was removed using PP/PE fibres, and >80% with pine bark and chitosan-covered bark. The highest adsorption capacity was found for PAHs (up to 44 mu g/g) using PP/PE fibres and bark. For all tested compounds, maximum sorption was approached within 30 min using these materials.

吸附过滤是去除雨水中溶解态、胶体态和颗粒态污染物最有前景的技术之一。本研究的目的是比较五种过滤材料——纤维素、壳聚糖、壳聚糖包覆树皮、松树皮以及聚丙烯/聚乙烯（PP/PE）纤维——对雨水中经常检测到的有机污染物的吸附能力，这些有机污染物包括多环芳烃（PAHs）、烷基酚和邻苯二甲酸酯。在批量试验中，添加了有机化合物混合物的合成雨水与这些材料接触长达24小时。然后对这些化合物进行液 - 液萃取，并使用气相色谱 - 质谱联用仪（GC - MS）进行分析。纤维素和壳聚糖对有机污染物的吸附能力非常低，而使用PP/PE纤维可去除大部分受试化合物初始浓度的70%以上，使用松树皮和壳聚糖包覆树皮可去除80%以上。使用PP/PE纤维和树皮对多环芳烃的吸附量最高（可达44微克/克）。对于所有受试化合物，使用这些材料在30分钟内即可达到最大吸附量。