CHEMICAL CHANGES IN SEDIMENT PORE-WATERS OF AN ACIDIC MINING LAKE AFTER ADDITION OF ORGANIC SUBSTRATE AND LIME FOR STIMULATING LAKE REMEDIATION


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Abstract

In the past five years, enclosures have been installed in an acidic mining lake in Lusatia to investigate in situ remediation processes. They were treated with straw, with straw and Carbokalk, or with Carbokalk alone, where Carbokalk is a by-product of the sugar industry (solid precipitate of non-sugars after lime clarification of extracted sugar beet juice). Sediment samples were taken as cores to get information about the behaviour of organic and inorganic components in sediment pore-water with depth. Vertical distributions of pH, soluble reactive phosphate, nitrate, ammonium, silica, aluminium, iron, manganese, calcium, magnesium, sodium, potassium, sulphate, and DOC were measured. The resulting profiles, each consisting of 15 data points at different depths, were compared by cluster analysis. The similarities of sediment cores from different treated enclosures relating to profiles of chemical components were discussed. Increased concentrations of potassium and sulphate were found in pore-water after substrate treatment. The data imply dissolution of potassium iron sulphate hydroxide minerals (jarosite) after an increase of pH caused by dissolution of lime and by sulphate reducing processes which were stimulated by organic substrate addition.

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