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Stark, L.R.; Williams, F.M. |
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The roles of spent mushroom substrate for the mitigation of coal mine drainage |
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1994 |
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Compost Science and Utilization |
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2 |
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4 |
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84-94 |
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acid mine drainage rehabilitation coal mining spent mushroom substrate 3 Geology |
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Spent mushroom substrate (SMS) has been used widely in coal mining regions of the USA as the primary substrate in constructed wetlands for the treatment of coal mine drainage. In laboratory and mesocosm studies, SMS has emerged as one of the substrates for mine water treatment. Provided the pH of the mine water does not fall below 3.0, SMS can be used in the mitigation plan. However, neither Mn nor dissolved ferric Fe appears to be treatable using reducing SMS wetlands. Since after a few years much of the nonrefractive organic carbon in SMS wil have been decomposed and metabolized, carbon supplementation can significantly extend the life of the SMS treatment wetland and improve water treatment. -from Authors |
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The roles of spent mushroom substrate for the mitigation of coal mine drainage; (1099507); 95k-07480; Using Smart Source Parsing pp; Geobase |
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CBU @ c.wolke @ 17639 |
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233 |
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Foucher, S.; Battaglia-Brunet, F.; Ignatiadis, I.; Morin, D. |
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Treatment by sulfate-reducing bacteria of Chessy acid-mine drainage and metals recovery |
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Journal Article |
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2001 |
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Chemical Engineering Science |
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56 |
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4 |
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1639-1645 |
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Acid mine drainage Sulfate-reducing bacteria Sulfide precipitation Hydrogen transfer Fixed bed column reactor |
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Acid-mine drainage can contain high concentrations of heavy metals and release of these contaminants into the environment is generally avoided by lime neutralization. However, this classical treatment is expensive and generates large amounts of residual sludge. The selective precipitation of metals using H2S produced biologically by sulfate-reducing bacteria has been proposed as an alternative process. Here, we report on experiments using real effluent from the disused Chessy-les-Mines mine-site at the laboratory pilot scale. A fixed-bed bioreactor, fed with an H2/CO2 mixture, was used in conjunction with a gas stripping column. The maximum rate of hydrogen transfer in the bioreactor was determined before inoculation. kLa was deduced from measurements of O2 using Higbie and Danckwert's models which predict a dependence on diffusivity. The dynamic method of physical absorption and desorption was used. The maximum rate of H2 transfer suggests that this step should not be a limiting factor. However, an increase in H2 flow rate was observed to induce an increase in sulfate reduction rate. For the precipitation step, the gas mixture from the bioreactor was bubbled into a stirred reactor fed with the real effluent. Cu and Zn could be selectively recovered at pH=2.8 and pH=3.5, respectively. Other impurities such as Ni and Fe could also be removed at pH=6 by sulfide precipitation. Part of the outlet stream from the bioreactor was used to regulate and maintain the pH during sulfide precipitation by feeding the outlet stream back into the bioreactor. The replacement of synthetic medium with real effluent had a positive effect on sulfate reduction rate which increased by 30-40%. This improvement in bacterial efficiency may be related to the large range of oligo-elements provided by the mine-water. The maximum sulfate reduction rate observed with the real effluent was 200 mgl-1 h-1, corresponding to a residence time of 0.9 day. A preliminary cost estimation based on a treatment rate of 5 m3 h-1 of a mine effluent containing 5 gl-1 SO42- is presented. |
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0009-2509 |
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Feb.; Treatment by sulfate-reducing bacteria of Chessy acid-mine drainage and metals recovery; file:///C:/Dokumente%20und%20Einstellungen/Stefan/Eigene%20Dateien/Artikel/10064.pdf; Science Direct |
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CBU @ c.wolke @ 10064 |
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54 |
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Cheng, S.-Y. |
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Reclamation of acid mine water by coupled ion exchange-reverse osmosis |
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1976 |
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Acid mine drainage Water reuse Saline water conversion Ion exchange process Saline water conversion Reverse osmosis process |
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Ph.D. thesis |
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West Virginia University, |
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Reclamation of acid mine water by coupled ion exchange-reverse osmosis; Opac |
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CBU @ c.wolke @ 7212 |
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419 |
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Author |
Plant, J. |
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Removal of base metals from mine waters using passive treatment processes involving autocatalytic oxidation and adsorption |
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2006 |
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Acid mine drainage Water — Pollution Mineral industries. — Wales |
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Removal of base metals from mine waters using passive treatment processes involving autocatalytic oxidation and adsorption; Opac |
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CBU @ c.wolke @ 7100 |
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269 |
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Brooks, R.P.; Unz, R.F.; Davis, L.K.; Tarutis, W.J.; Yanchunas, J. |
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Long-term removal and retention of iron and manganese from acidic mine drainage by wetlands |
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1990 |
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147 |
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Acid mine drainage Wetlands Biological treatment Iron removal Manganese removal |
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A promising low-technology solution for treating acidic mine drainage (AMD) emanating from coal mined lands involves the use of constructed wetlands.^The research was directed at addressing questions about retention mechanisms for the long-term storage of iron and manganese in constructed wetlands dominated by broad-leaved cattails (Typha latifolia).^Three sites in central Pennsylvania spanning the range of water chemistry parameters found in AMD were investigated.^When the AMD was circumneutral, and metal loadings were low, 79% of the iron, and 48% of the manganese were retained on average.^In the highly acidic site (pH approx.^= 3), < 10% of the metal loadings were retained.^The primary retention mechanism appears to be the formation of metal oxides in the aerobic zones of the sediments.^Although most microbial isolates extracted from sediment cores originated in the aerobic portions of the sediments, there was no evidence that they were transforming metals.^When AMD is circumneutral and metal loadings are low, constructed wetlands can be an effective approach to treating mine drainage.^At sites with highly acidic waters and high metal loadings, the use of constructed wetlands to treat AMD may be ineffectual, and should be implemented with caution. |
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Long-term removal and retention of iron and manganese from acidic mine drainage by wetlands; Springfield, Va. : NTIS; Opac |
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CBU @ c.wolke @ 7082 |
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435 |
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