Carbonated waste valorisation from a peat bog exploitation in the treatment of arsenic-polluted waters
2022
Aguilar-Garrido, A. | García-Carmona, M. | Sierra-Aragón, M. | Martín-Peinado, F. J. | Martínez Garzón, F. J.
The purpose of this study is to determine the capacity of peat and carbonated waste obtained from peat extraction to remove arsenic from highly polluted waters. This research examined the arsenic adsorption of both materials (peat and carbonated waste) and different mixtures made from both materials exposed to arsenic-polluted waters at concentrations of 0, 50, 100, and 200 μg As l⁻¹. The potential toxicity of the treated waters, materials, and mixtures was also assessed by toxicity bioassays using Lactuca sativa L. and heterotrophic respiration. In all cases, a significant reduction in arsenic concentration in the treated waters occurred; however, the mixture richest in peat (90%) and the carbonated waste were the most effective, while single peat was the only one that did not reduce arsenic concentration below the guideline value for drinking water (10 µg As l⁻¹) set by the World Health Organization. The adsorption capacity of the materials and mixtures is strongly conditioned by their properties, especially pH and calcium carbonate content. The mixture richest in peat had a much higher arsenic adsorption capacity than single peat. Generally, high potential toxicity was detected in single peat, while carbonated waste and the mixtures showed better responses. Nevertheless, this toxicity may be due to the toxic effect of polyphenolic compounds in peat instead of the arsenic content. Results reveal that carbonated waste is the most recommended material for the decontamination of arsenic-polluted waters, while mixtures enhance arsenic adsorption and decrease phytotoxic effects, promoting the potential fertility of the carbonated waste.
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