Comparison of batch and column methods for assessing leachability of hazardous waste

Jackson, D. R.; Garrett, B. C.; Bishop, Thomas A.

doi:10.1021/es00127a007

Cited by 79 publications

(22 citation statements)

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“…[22] However, the effect of Mn reduction on Sb mobility was overridden by the initial desorption of Sb V and the concomitant reduction of Sb V ; thus it could not clearly be identified. In contrast, column experiments may provide information on chemical reactions in soil that cannot be obtained from studies under stagnant conditions, [31] as they will take into account effects that are associated with transport processes. Flow-through soil columns may therefore be a powerful tool to separate the different phases of reduction and desorption reactions because of the continuous replacement of soil solution and the possibility to collect samples in high temporal resolution.…”

Section: Introductionmentioning

confidence: 99%

Antimony leaching from contaminated soil under manganese- and iron-reducing conditions: column experiments

et al. 2014

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Environmental context. Contamination of shooting range soils by antimony (Sb) released from corroding ammunition has become an issue of public environmental concern. Because many of these sites are subject to waterlogging and consequently limited aeration, we performed column experiments with contaminated shooting range soil to investigate Sb mobility under such conditions. The results are important for our understanding of the risks arising from Sb-contaminated soils, and also for the derivation of appropriate management strategies for such sites.Abstract. Despite the environmental risks arising from antimony-contaminated sites, critical factors controlling the mobility of Sb in soils have still not been fully identified to date. We performed column experiments to investigate how reducing conditions affect Sb leaching from a calcareous shooting range soil, with a special focus on the relationship between Sb release and mineral dissolution processes. After eluting the columns for 5 days with 15 mM lactate solution at a flow rate of 33 mm day À1 , the flow was interrupted for 37 days and then resumed for another 5 days. With the transition to moderately reducing conditions (,300 mV) after 1 day of flow, effluent Sb V and manganese (Mn) concentrations showed a concomitant increase, providing evidence that Sb V associated to these phases was released by the reductive dissolution of Mn minerals. The release of Sb V was counteracted by the reduction to Sb III , which was first scavenged by iron (Fe) (hydr) oxides and then slowly liberated again when the redox potential further decreased to Fe-reducing conditions. Laser ablation-inductively coupled plasma-mass spectrometry revealed the presence of an initial pool of Sb associated with Mn-containing, Fe-free phases, underpinning the important role of the latter in addition to Fe (hydr)oxides as Sb sorbents.

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Section: Introductionmentioning

confidence: 99%

Antimony leaching from contaminated soil under manganese- and iron-reducing conditions: column experiments

et al. 2014

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“…The specific objective was to determine the dynamics of leachate chemistry, indicated by acidity, salinity, common toxic elements and labile C, in neutral Cu-Au tailings with and without woodchips or biochar amendment under laboratory leaching conditions over 20 weeks. Column leaching has been used as a routine approach for assessing the geochemistry and toxicity of porous materials for many years [21][22][23], and it was particularly useful for mine wastes as supposed to better simulate field conditions than the batch methods [24][25][26][27]. Despite the significant deviation in leachate chemistry among replicate columns over time [23,28], column leaching was still thought to be a valuable approach to assess the medium-to long-term dynamics of mine tailings' toxicity and hydrogeochemistry.…”

Section: Introductionmentioning

confidence: 99%

Dynamics in leachate chemistry of Cu-Au tailings in response to biochar and woodchip amendments: a column leaching study

You

Huang

et al. 2013

Environ Sci Eur

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Background: Phytostabilization has been advocated as a promising approach to reduce mine tailings' adverse effects to surrounding environment. With many years of efforts in both laboratory and field trials, organic amendments are found to be essential in tailing revegetation. Yet, the associate geochemical dynamics caused by different amendments has rarely been examined. As reactive minerals are usually rich in tailings, geochemical changes induced by amendments would influence seepage management and revegetation strategies. The present study aimed to investigate geochemical dynamics in Cu-Au tailing leachate, in response to amendments with biochar produced from hardwood timber at high charring temperature or woodchips of mixed native tree species in a column leaching experiment under laboratory conditions. Results: Results showed that the Cu-Au tailings tested in this study were relatively stable after natural weathering, with little resilience of peak salinity, stable pH and low levels of metals in leachate against the six cycles of leaching over 20 weeks. In comparison with the control without any amendments, biochar treatment did not cause any substantial changes in most examined properties of leachate, except for the reduction in dissolved organic C and NO 2

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“…The observed temporal leaching patterns indicated that the majority of the leached compound passed through soil A columns during the early stages of the experiment (75% in the first 2 days) whereas for soil B a more prolonged retention was observed (34% released in the first 4 days) with small amounts of monuron still appearing after 26 days. This was paralleled, although on a much reduced scale, by the leaching behaviour of naphthalene which may suggest the presence of some initial channelling in soil A providing preferential pathways (Jackson et al, 1984). Despite the different temporal characteristics demonstrated by monuron, very similar total amounts were released in the leachates from soil A (2144 ± 34 µg) and soil B columns (2175 ± 265 µg).…”

Section: Mass Balances For Pahsmentioning

confidence: 82%

“…Stirred aqueous batch experiments have been frequently employed to study sorption and desorption processes (e.g. Chiou et al, 1998;Northcott and Jones, 2001) whereas column leaching methods accompanied by analysis of both the leachates and the soil column permit simulation of the downward soil movement of contaminants (Jackson et al, 1984). Similar experiments have identified the important role played by the quantity and quality of soil organic matter in controlling the leaching of PAHs from soils and sediments (Petruzelli et al, 2002;Ran et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Soil mobility of surface applied polyaromatic hydrocarbons in response to simulated rainfall

Revitt

Balogh

Jones

2013

Environ Sci Pollut Res

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Polyaromatic hydrocarbons (PAHs) are emitted from a variety of sources and can accumulate on and within surface soil layers. To investigate the level of potential risk posed by surface contaminated soils, vertical soil column experiments were conducted to assess the mobility, when leached with simulated rainwater, of six selected PAHs (naphthalene, phenanthrene, fluoranthene, pyrene, benzo(e)pyrene and benzo(ghi)perylene) with contrasting hydrophobic characteristics and molecular weights/sizes. The only PAH found in the leachate within the experimental period of 26 days was naphthalene. The lack of migration of the other applied PAHs were consistent with their low mobilities within the soil columns which generally parallelled their log K oc values. Thus only 2.3% of fluoranthene, 1.8% of pyrene, 0.2% of benzo(e)pyrene and 0.4% of benzo(ghi)perylene were translocated below the surface layer. The PAH distributions in the soil columns followed decreasing power relationships with 90% reductions in the starting levels being shown to occur within a maximum average depth of 0.94 cm compared to an average starting depth of 0.5 cm. A simple predictive model identifies the extensive time periods, in excess of 10 years, required to mobilise 50% of the benzo(e)pyrene and benzo(ghi)perylene from the surface soil layer. Although this reduces to between 2 and 7 years for fluoranthene and pyrene, it is concluded that the possibility of surface applied PAHs reaching and contaminating a groundwater aquifer is unlikely.

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Comparison of batch and column methods for assessing leachability of hazardous waste

Cited by 79 publications

References 1 publication

Antimony leaching from contaminated soil under manganese- and iron-reducing conditions: column experiments

Antimony leaching from contaminated soil under manganese- and iron-reducing conditions: column experiments

Dynamics in leachate chemistry of Cu-Au tailings in response to biochar and woodchip amendments: a column leaching study

Soil mobility of surface applied polyaromatic hydrocarbons in response to simulated rainfall

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