Departamento de Edafoloxía e Química Agrícola, Escola Politécnica Superior, University of Santiago de Compostela, Campus univ. s/n, 27002 Lugo, Spain.
Environ Sci Pollut Res Int. 2013 Apr;20(4):2670-8. doi: 10.1007/s11356-012-1192-6. Epub 2012 Sep 19.
Different batches of valued mussel shell and waste mussel shell ash are characterised. Shell ash has pH > 12 and high electrical conductivities (between 16.01 and 27.27 dS m(-1)), while calcined shell shows pH values up to 10.7 and electrical conductivities between 1.19 and 3.55 dS m(-1). X-ray fluorescence, nitric acid digestion and water extractions show higher concentrations in shell ash for most parameters. Calcite is the dominant crystalline compound in this ash (95.6%), followed by aragonite. Adsorption/desorption trials were performed for mussel shell ash and for a waste mixture including shell ash, sewage sludge and wood ash, showing the following percentage adsorptions: Hg(II) >94%, As(V) >96% and Cr(VI) between 11 and 30% for shell ash; Hg(II) >98%, As(V) >88% and Cr(VI) between 30 and 88% for the waste mixture. Hg and As desorption was <5% for both shell ash and the waste mixture, while Cr desorption was between 92 and 45% for shell ash, and between 19 and 0% for the mixture. In view of that, mussel shell ash and the mixture including shell ash, sewage sludge and wood ash could be useful for Hg(II) and As(V) removal.
不同批次的有价值的贻贝壳和贻贝壳灰进行了特征描述。贝壳灰的 pH 值大于 12，电导率（16.01 至 27.27 dS m(-1)）较高，而煅烧贝壳的 pH 值高达 10.7，电导率在 1.19 至 3.55 dS m(-1)之间。X 射线荧光、硝酸消化和水提取表明，贝壳灰中大多数参数的浓度都较高。方解石是这种灰分中主要的结晶化合物（占 95.6%），其次是文石。对贻贝壳灰和包括贝壳灰、污水污泥和木灰在内的废物混合物进行了吸附/解吸试验，结果表明，贻贝壳灰的吸附百分比如下：Hg(II) >94%，As(V) >96%，Cr(VI)在 11%至 30%之间；对于废物混合物，Hg(II) >98%，As(V) >88%，Cr(VI)在 30%至 88%之间。贻贝壳灰和废物混合物的 Hg 和 As 的解吸率均<5%，而 Cr 的解吸率在贻贝壳灰中为 92%至 45%，在混合物中为 19%至 0%。因此，贻贝壳灰和包括贝壳灰、污水污泥和木灰在内的混合物可用于去除 Hg(II)和 As(V)。
