Abstract
AbstractThe aim of the study was to determine the content and leachability of Sr in ashes obtained through combusting municipal waste in household furnaces. The waste had been collected as a mixed stream and as separate fractions (i.e. furniture, sponges, waste paper, PCV packaging, plastic-coated paper cartons, imitation leather, rubber, textiles and polystyrene). Using single-step chemical extractions, (HCl + HNO3, H2O, 0.01 M CaCl2, 0.1 M CH3COOH), we determined the total content of Sr (TC) and proportions of the following fractions: water-leachable, phytoavailable and easily soluble and bound to carbonates. We also analyzed the effect of reducing pH in the extraction solutions on St leachability from the study material. The study showed that Sr concentration in ash generated from the combustion of conventional fuels, alternative fuels and municipal waste ranged from 114 to 1006 mg/kg. The largest amounts of Sr were found in ash generated from the combustion of alternative fuels (coal pellets 488–1006 mg/kg), conventional fuels (hard coal 430–670 mg/kg) and mixed waste (237–825 mg/kg). The most mobile fraction of Sr (water-leachable) comprised from 1.3% to nearly 91% TC; the phytoavailable fraction and the ion-exchange and carbonate-bound fraction comprised 3–92% TC and 9–72% TC, respectively. We also found that the greatest pH reductions do not always entail the greatest amounts of extracted Sr. A much more significant factor in this respect is the mineral and chemical composition of primary materials, which can buffer changes in pH. The Risk Assessment Code (RAC) values pointed to a varied environmental risk and the highest RAC values (> 70) were found for coal pellets, wood pellets, straw, rubber and plastic containers for mixed oils.
Publisher
Springer Science and Business Media LLC
Reference59 articles.
1. Ageeva, T. N., Chegerov, T. I., Shchur, A. V., & Shapsheeva, T. P. (2010). Role of radio ecological and social factors in formation of doses of internal radiation of villagers of the territory of radioactive pollution. Ecology Messen, 2, 40–49.
2. Bloise, A. (2019). Thermal behaviour of actinolite asbestos. Journal of Materials Science, 54, 11784–11795. https://doi.org/10.1007/s10853-019-03738-8
3. Bogdanovich, N. G., Konovalov, É. E., Starkov, O. V., et al. (1998). Cesium and strontium sorption separation from liquid radioactive wastes and immobilization in geocements. Atomic Energy, 84, 14–18. https://doi.org/10.1007/BF02430648
4. Burger, A., & Lichtscheidl, I. (2019). Strontium in the environment: Review about reactions of plants towards stable and radioactive strontium isotopes. Science of the Total Environment, 653, 1458–1512.
5. Chatterjee, S., Mitra, A., Walther, C., Gupta, D. K. (2020). Plant response under strontium and phytoremediation. In: P. Pathak, D. Gupta (Eds.) Strontium Contamination in the Environment. The Handbook of Environmental Chemistry, vol 88. Springer, Cham. https://doi.org/10.1007/978-3-030-15314-4_5