Impact of lime treatment on tailings dewatering and cap water quality under an oil sands end pit lake scenario
| Autor: | Mike Tate, Mohamed N.A. Meshref, Ania C. Ulrich, Nesma Eltoukhy Allam, Nikolas Romaniuk, Bipro Ranjan Dhar |
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| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
010504 meteorology & atmospheric sciences Alkalinity 010501 environmental sciences engineering.material Pulp and paper industry complex mixtures 01 natural sciences Pollution Dewatering Tailings 6. Clean water Pore water pressure chemistry.chemical_compound chemistry 13. Climate action engineering Environmental Chemistry Oil sands Environmental science Petroleum Water quality Waste Management and Disposal 0105 earth and related environmental sciences Lime |
| Zdroj: | Science of The Total Environment. 781:146699 |
| ISSN: | 0048-9697 |
| DOI: | 10.1016/j.scitotenv.2021.146699 |
| Popis: | Oil sands tailings have a limited ability to dewater and can also release toxic water, so finding a cost-effective tailings reclamation strategy has been challenging. End pit lakes (EPLs) are being examined as one potential approach to reduce fluid fine tailings (FFT) inventories for the oil sands industry. This study investigated the effect of adding lime (650 to 4000 ppm) on FFT dewatering and improving cap water quality under the simulated EPL scenario. The results illustrated that a high lime dose of 3500 ppm achieved the highest FFT water recovery, decreased the cap water alkalinity at the end of the experiment (after 90 d), and increased the possibility of cation exchange (at day 0). In contrast, the degradation of petroleum hydrocarbons was slightly enhanced at low lime dose of 650 ppm in comparison to high doses. In addition, the 650 ppm dose resulted in minimal change in the microbial cell counts at day 90, compared with high lime doses that resulted in a large reduction in the cell counts. Comparisons of toxicity of the FFT pore water after lime addition exhibited higher toxic effects for lime dosages >1600 ppm. Nevertheless, at all lime doses, low cap water toxicity (i.e. |
| Databáze: | OpenAIRE |
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