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Calcium and magnesium in underground waters around a communal waste dump

100%

Szymanska-Pulikowska A.

Journal of Elementology

2008

tom 13

nr 3

Contaminations carried by effluents from communal waste dumps are a serious threat to underground waters. The effluents may contain solutes washed away by precipitation and also organic and mineral substances that arise during anaerobic and aerobic waste decomposition. Aside of substances that are known to be harmful to the human health (heavy metals), the effluents may contain a large number of common elements which are not regarded harmful at natural concentrations. In effluents from “young” dumps, where the waste undergoes acidic fermentation mainly, calcium concentration may exceed 3,000 mg⋅dm-3 and that of magnesium reach 1,500 mg⋅dm-3. Effluents from “old” dumps, where methane fermentation dominates, most often contain up to 400 mg⋅dm-3 of calcium and 200 mg⋅dm-3 magnesium. The aim of the work was to elucidtyate the character and dynamics of changes in concentration of the elements studied in effluents from a municipal waste dump at Maoelice near the city of Wrocław, and in underground waters of the adjacent land. Deposition of waste in this area began in the late 1960s. The ground conditions provide for an easy contact between underground water and dumped waste, and transport of the washed-out pollutants. Only part of the dump has sealing and drainage that conducts the effluents to a reservoir, where samples for this study were taken. At the turn of 1999 and 2000 the utilization of the dump was terminated and its reclamation began. Thus, the slopes of the refuse heap were fortified with reinforced ground, the cap sealed with synthetic-mineral material, and from the side of underground water inflow a shield was made (in 2002) that reached down to the impermeable ground layer in order to stop the inflowing waters. In 2004 the reservoir for effluents was filled in. The results, presented in this report, on the content of calcium and magnesium in underground waters flowing into the dump did not show any other extra contamination. In dump effluents the relations between calcium and magnesium concentration remained on similar levels. Like for other dumps, in the first years of study calcium concentration prevailed, whereas effluents from older dumps contained greater amounts of magnesium. Increased contents of calcium and magnesium in underground waters flowing under the unsealed part of the dump indicated at continuous inflow of contaminations, that were not eliminated by the technical means applied during reclamation of the installation. Variations in the properties of waters flowing out of the dump depended mainly on the composition of the inflowing waters (max. concentrations occurred concurrently) and the amount of contaminants emitted into the ground from the dump (relations between mean contents of calcium and magnesium varied in them like in the dump effluents).

Obrobka sciekow z wysypisk metoda fotochemicznego utleniania na mokro

59%

Leitzke O.

Roczniki Państwowego Zakładu Higieny

1996

tom 47

nr 1

125-134

Opisano metodę obróbki ścieków o wysokiej wartości ChZT oraz wysokiej zawartości chlorowcowanych węglowodorów, np. odcieki z wysypisk lub wody gruntowe o wysokiej zawartości wielopierścieniowych węglowodorów, które mogą być oczyszczane za pomocą samego ozonu lub kombinacji ozonu z UV, lub też w kombinacji oczyszczania biologicznego, ozonu i UV.

Ograniczanie wyników

1 Journal of Elementology

1 Roczniki Państwowego Zakładu Higieny

1 Leitzke O.

1 Szymanska-Pulikowska A.

1 2008

1 1996

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Calcium and magnesium in underground waters around a communal waste dump

Obrobka sciekow z wysypisk metoda fotochemicznego utleniania na mokro