Treatment of waters polluted with radioactive elements and heavy metals by means of a laboratory passive system

Groudev, Stoyan; Bratcova, S.G.; Komnitsas, K.

doi:10.1016/s0892-6875(99)00004-7

Cited by 47 publications

(20 citation statements)

References 2 publications

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“…This mechanism is targeted by constructed wetland systems 6 that aim at stimulating microbial-mediated reduction of uranyl ions as described by Lovley et al 13 Recent work has shown that the dominant species formed in the field by microbially mediated U(VI) reduction is monomeric U(IV) 10 . The present study further shows that the lability of non-crystalline U(IV) species may lead to the release of highly mobile U(IV)-bearing colloids.…”

Section: Discussionmentioning

confidence: 99%

“…Because of the relatively high stability and low solubility of uraninite (U IV O 2 ) under reducing conditions at near-neutral pH, its formation as a result of (bio)reduction is considered an efficient strategy for U immobilization in sediments 5 . A similar reductive immobilization process is sought in constructed wetland systems 6 . Thus, U(IV)-where it occurs in the environment-is generally expected to be a low mobility U species, in contrast to U(VI) species that are generally soluble and mobile.…”

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confidence: 99%

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Mobile uranium(IV)-bearing colloids in a mining-impacted wetland

et al. 2013

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Mobile uranium(IV)-bearing colloids in a mining-impacted wetland

et al. 2013

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“…The groundwater has been impacted by the geological condition of the area and contains 1. 27 The PRB column tests were performed using two acrylic cylindrical columns with 40 cm in height, 7.5 cm in inner diameter, 13 side ports along the vertical direction, and approximately 1767.86 cm 3 in internal volume. The bottom layer (1.5 cm) and top layer (1.5 cm) of the column packing consisted of 100% glass beads (0.6-0.…”

Section: Column Testsmentioning

confidence: 99%

“…23) Animal manure has been investigated for acid mine drainage treatment in groundwater, [24][25][26][27][28] but there are no specific research in which animal manures were used to remove As in groundwater. In the present work, permeable reactive barrier column using ZVI and sheep manure as reactive materials are investigated on the process for the passive treatment of As and Mn in groundwater simulated mine tailing filtrates at Sumbawa Island, Indonesia, to discuss the mechanism of As and Mn immobilization in the system, and to expect the lifetime of PRBs.…”

Section: Introductionmentioning

confidence: 99%

Immobilization of Arsenic and Manganese in Contaminated Groundwater by Permeable Reactive Barriers Using Zero Valent Iron and Sheep Manure

et al. 2008

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A permeable reactive barriers (PRBs) column test was carried out to remove arsenic (As) and manganese (Mn) from groundwater using zero valent iron (ZVI), sheep manure, compost and woodchips as reactive materials. Arsenic was mainly immobilized through sorption and co-precipitation with iron-bearing minerals, and also possibly precipitation as FeAsO 4 . The presence of sulfate-reducing bacteria (SRB) in the inoculated column was suggested by decrease of sulfate concentrations and increase of 34 S in the effluent. Arsenic was more effective to immobilize in the inoculated than in the sterilized column due to co-precipitation with sulfides formed by reduction of sulfate in addition sorption and/or co-precipitation with carbonates. The Mn was mainly immobilized through adsorption onto compost and ZVI, and partly by precipitation as carbonates. Manganese was more effectively immobilized in the sterilized than in the inoculated column. Since compost is biodegraded, the capability of compost to immobilize Mn 2þ decreased in the inoculated column. The result demonstrates that As is more effective to immobilize using mixture of sheep manure with ZVI than only ZVI as reactive materials in PRBs.

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“…The flow of meteoric water over sulfidic tailings may further increase the potential for metal leaching from tailings due to the fine to very fine-grained character of the tailings material (Mohamed et al, 2002) but also due to dissolution of heavy-metal bearing secondary phases that develop at the surface and near the surface of the tailings (Wray, 1998). Therefore, abandoned mine waste disposal sites containing sulfide minerals may pose significant environmental threats and may severely contaminate surface and groundwater as well as soils and ecosystems (Bigham and Nordstrom, 2000;Draves and Fox, 1998;Groudev et al 1999;Hudson-Edwards et al, 2003;Komnitsas et al 1998;Adam, 2003).…”

Section: Introductionmentioning

confidence: 99%