The Use of Construction Waste to Remediate a Thermally Active Spoil Heap

This article presents the results of experimental research on possible use construction and demolition waste (CDW) to improve properties unburnt tailings originating from thermally active spoil heap in Heřmanice (Ostrava, Czech Republic). Mining activity anywhere world generally entails a lot negative impacts environment, which are long-term nature. One most pressing challenges remediation consequences mining is thermal heaps associated with high acidity tailings. Active (pH/H2O), exchangeable (pH/CaCl2), hydrolytic (Ha), elemental composition CDW have been monitored. Based an study, it has proven that compared burnt (pH/H2O = 8.4, pH/CaCl2 8.9 Ha 1.4 mmol kg−1), show acidic 3.7, 3.6 205 kg−1). The bioavailability two selected potentially toxic elements (PTEs), namely Al Fe, was examined based composition. BCR sequential extraction analysis used determine their bioavailability. It mixing positive effect pH value, further development entire site. increase value provably dependent amount added, so can be said increasing will result improved parameters aluminum released both reducible oxidisable fractions, where mainly bound sulphides. relatively concentration Fe fraction (2002 mg kg−1) suggests sulphides tailings, due residual pyrite sulphide content dumped material, as expected. work found no limits longer positively affects For practical application, however, important mixture properly mixed then for remediation.