| Records |
| Author |
Ye, Z.H. |
| Title |
Removal and distribution of iron, manganese, cobalt, and nickel within a Pennsylvania constructed wetland treating coal combustion by-product leachate |
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Journal Article |
| Year |
2001 |
Publication |
Journal of Environmental Quality |
Abbreviated Journal |
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| Volume |
30 |
Issue |
4 |
Pages |
1464-1473 |
| Keywords |
mine water treatment |
| Abstract |
A flow-through wetland treatment system was constructed to treat coal combustion by-product leachate from an electrical power station at Springdale, Pennsylvania. In a nine-compartment treatment system, four cattail (Typha latifolia L.) wetland cells (designated Cells I through 4) successfully removed iron (Fe) and manganese (Mn) from the inlet water; Fe and Mn concentrations were decreased by an average of 91% in the first year (May 1996-May 1997), and by 94 and 98% in the second year (July 1997-June 1998), respectively. Cobalt (Co) and nickel (Ni) were decreased by an average of 39 and 47% in the first year, and 98 and 63% in the second year, respectively. Most of the metal removed by the wetland cells was accumulated in sediments, which constituted the largest sink. Except for Fe, metal concentrations in the sediments tended to be greater in the top 5 em of sediment than in the 5- to 10- or 10- to 15-cm layers, and in Cell I than in Cells 2, 3, and 4. Plants constituted a much smaller sink for metals; only 0.91, 4.18, 0.19, and 0.38% of the Fe, Mn, Co, and Ni were accumulated annually in the aboveground tissues of cattail, respectively. A greater proportion of each metal (except Mn) was accumulated in cattail fallen litter and submerged Chara (a macroalga) tissues, that is, 2.81, 2.75, and 1.05% for Fe, Co, and Ni, respectively. Considerably higher concentrations of metals were associated with cattail roots than shoots, although Mn was a notable exception. |
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Removal and distribution of iron, manganese, cobalt, and nickel within a Pennsylvania constructed wetland treating coal combustion by-product leachate; Wos:000174863000040; Times Cited: 15; ISI Web of Science |
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CBU @ c.wolke @ 17061 |
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122 |
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| Author |
Chung, I.J. |
| Title |
Immobilization of arsenic in tailing by using iron and hydrogen peroxide |
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Journal Article |
| Year |
2001 |
Publication |
Environ. Technol. |
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22 |
Issue |
7 |
Pages |
831-835 |
| Keywords |
mine water treatment |
| Abstract |
Under environmental conditions, arsenic (As) reveals anionic behavior and is converted into various forms in accordance with the Eh/pH condition. This causes the difficulty of treating As with other heavy metals in tailing. This study was carried out to develop the immobilization method of arsenic in tailing as ferric arsenate (FeAsO4) using hydrogen peroxide. According to experimental results, the extracted concentrations of arsenic and iron (Fe) from tailing were reduced up to 84% and 93%, respectively. In the experiment using pure Pyrite (FeS2) and As solution, As concentration decreased with an increase of hydrogen peroxide dosage. The experimental results of re-extraction showed that only 10% of As and 20% of Fe were extracted in the case of using hydrogen peroxide. As a result, the long-term stability of this method was clarified. |
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Immobilization of arsenic in tailing by using iron and hydrogen peroxide; Wos:000170195000008; Times Cited: 0; ISI Web of Science |
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CBU @ c.wolke @ 17046 |
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123 |
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Goulet, R.R. |
| Title |
Changes in dissolved and total Fe and Mn in a young constructed wetland: Implications for retention performance |
Type |
Journal Article |
| Year |
2001 |
Publication |
Ecological Engineering |
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17 |
Issue |
4 |
Pages |
373-384 |
| Keywords |
mine water treatment |
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Surface-flow wetlands are generally considered sinks for Fe and Mn but they may also export and affect the partitioning of these metals. This study was undertaken to evaluate the effect of a young constructed wetland on the retention and transformation of both dissolved and particulate Fe and Mn. Duplicate water samples were collected every three days at the inlet and outlet structures of the Monahan Wetland, Kanata, Ontario, from spring of 1997 to 1999. While on a yearly basis the wetland showed significant retention of che dissolved phase, the retention of total Fe and Mn was poor. There were strong seasonal differences in retention and, during the winter, the wetland was a source. The wetland transformed dissolved into particulate Fe and Mn from spring to fall whereas during the winter, dissolved Fe and Mn were released. Changes in pH, alkalinity and temperature could explain 11% and 40% of the outlet variation in the ratio of dissolved to total Fe and Mn respectively. Furthermore, from spring to late summer, planktonic algal biomass was negatively related to the ratio of dissolved to total Fe and Mn implying a role in Fe and Mn transformations in young wetlands where emergent and submerged vegetation have yet to dominate the system. (C) 2001 Elsevier Science B.V. All rights reserved. |
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Changes in dissolved and total Fe and Mn in a young constructed wetland: Implications for retention performance; Wos:000169881900004; Times Cited: 5; ISI Web of Science |
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CBU @ c.wolke @ 17050 |
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124 |
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| Author |
Goulet, R.R. |
| Title |
The evaluation of metal retention by a constructed wetland using the pulmonate gastropod Helisoma trivolvis (Say) |
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Journal Article |
| Year |
2001 |
Publication |
Archives of Environmental Contamination and Toxicology |
Abbreviated Journal |
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| Volume |
40 |
Issue |
3 |
Pages |
303-310 |
| Keywords |
mine water treatment |
| Abstract |
Constructed wetlands are built because they can act as sinks fur many pollutants, thereby protecting the water quality of downstream ecosystems. The treatment performance is generally assessed using mass balance calculations. Along with the mass balance approach, we compared the metal content of populations of a common pond snail (Helisoma trivolvis Say) collected upstream and downstream of a 3-year-old constructed wetland. Snails were collected in early May, June, and August 1998. At the same time, water samples for particulate and dissolved metals were taken every 3 days for the duration of the experiment. Overall, the wetland retained most dissolved metals, including Fe, Mn, Cu, Zn, Ni, and Pb, but released dissolved As. However, the wetland released particulate Fe and Mn. With the exception of Zn, the metal concentrations of the downstream snails were on average higher than those measured in the upstream population. The higher metal content of downstream snails was likely related to the significant export of particulate metals by the wetland, despite the overall retention of dissolved metals. This study points to the need for biological as well as chemical monitoring to determine the treatment efficiency and toxicological risk associated with constructed wetlands. |
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The evaluation of metal retention by a constructed wetland using the pulmonate gastropod Helisoma trivolvis (Say); Wos:000167524900002; Times Cited: 2; ISI Web of Science |
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CBU @ c.wolke @ 17049 |
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125 |
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Gatzweiler, R. |
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Cover design for radioactive and AMD-producing mine waste in the Ronneburg area, Eastern Thuringia |
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Journal Article |
| Year |
2001 |
Publication |
Waste Management |
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21 |
Issue |
2 |
Pages |
175-184 |
| Keywords |
mine water treatment |
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At the former uranium mining site of Ronneburg, large scale underground and open pit mining for nearly 40 years resulted in a production of about 113 000 tonnes of uranium and about 200 million cubic metres of mine waste. In their present state, these materials cause risks to human health and strong environmental impacts and therefore demand remedial action. The remediation options available are relocation of mine spoil into the open pit and on site remediation by landscaping/contouring, placement of a cover and revegetation. A suitable vegetated cover system combined with a surface water drainage system provides long-term stability against erosion and reduces acid generation thereby meeting the main remediation objectives which are long-term reduction of radiological exposure and contaminant emissions and recultivation. The design of the cover system includes the evaluation of geotechnical, radiological, hydrological, geochemical and ecological criteria and models. The optimized overall model for the cover system has to comply with general conditions as, e.g. economic efficiency, public acceptance and sustainability. Most critical elements for the long-term performance of the cover system designed for the Beerwalde dump are the barrier system and its long-term integrity and a largely self-sustainable vegetation. (C) 2001 Elsevier Science Ltd. All rights reserved. |
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Cover design for radioactive and AMD-producing mine waste in the Ronneburg area, Eastern Thuringia; Wos:000166676900008; Times Cited: 0; ISI Web of Science |
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| Call Number |
CBU @ c.wolke @ 17047 |
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127 |
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