Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1021/es034863e
Titel (primär) Microcosm studies for neutralization of hypolimnic acid mine pit lake water (ph 2.6)
Autor Frömmichen, R.; Wendt-Potthoff, K.; Friese, K.; Fischer, R.
Journal / Serie Environmental Science & Technology
Erscheinungsjahr 2004
Department SEEFO
Band/Volume 38
Heft 6
Seite von 1877
Seite bis 1887
Sprache englisch
Abstract Ten microcosms of 0.088 m3 water volume (0.3 m i.d. and 1.20 m height) were designed for neutralization studies representing hypolimnic ecosystem models for acid mine pit lakes. Sediment and water were collected from an acid lignite mine pit lake (Brandenburg, Germany) and filled into the microcosms. To determine the efficacy of controlled in situ organic carbon amendments as a possible neutralization method, sediment and water were treated with ethanol and Carbokalk with and without wheat straw. The water chemistry was monitored for 1 yr. At start-up and end of the experiments, the sediment was characterized. Iron and sulfate were removed with varying intensity from the water phase as a result of microbial iron and sulfate reduction together with a subsequent precipitation of unsoluble sulfide minerals to the sediment. The pH rose, and alkalinity generation and bacterial growth were observed. Neutralization rates were calculated using equivalents of accumulated total reduced inorganic sulfur together with the nonsulfidic reactive ferrous iron in the sediment. In the treated microcosms, the neutralization rates were between 6 and 15 equiv m-2 a-1. Carbokalk was most effective in stimulating growth of sulfate-reducing bacteria and probably also served as inoculum. With Carbokalk together with wheat straw, the pH increased from 2.6 to around 6.5 within the whole microcosm. The critical revision of the results indicates that the application of Carbokalk (approximately 3.9 kg m-2) together with the application of wheat straw (approximately 9.3 kg m-2) is most suitable for further experiments in outdoor enclosures (mesocosms). For that case, the prediction of the water quality for a lake water column after multiple lake turnover events is presented based on batch reaction simulation using the geochemical model PHREEQC.
dauerhafte UFZ-Verlinkung
Frömmichen, R., Wendt-Potthoff, K., Friese, K., Fischer, R. (2004):
Microcosm studies for neutralization of hypolimnic acid mine pit lake water (ph 2.6)
Environ. Sci. Technol. 38 (6), 1877 - 1887