| 2481. |
- Kumpiene, Jurate, et al.
(författare)
-
Chemically stabilized arsenic-contaminated soil for landfill covers
- 2014
-
Ingår i: One century of the discovery of arsenicosis in Latin America (1914-2014). - Boca Raton,Ffla. : CRC Press. - 9781138001411 - 9781315778884 ; , s. 842-843
-
Konferensbidrag (refereegranskat)abstract
- Arsenic (As) stabilization using zerovalent iron (Fe0) and its combination with peat was investigated in soil used as a pilot scale landfill cover in Northern Sweden. Leachate percolating through a 2 m thick layer of treated and untreated soil was collected in field. Chemical fractionation using sequential extraction, phytotoxicity test with dwarf beans and bioaccessibility tests simulating gastric solution were performed to assess the residual risks to the environment and human health. The results show that the exchangeable As-fraction in stabilized soils decreased when compared to the untreated soil, while other fractions remained unaffected. All the morphological parameters of plants improved and the bioaccessible As-fraction significantly decreased in the Fe-peat treated soil. The analysis of the leachates collected in field showed a substantially decreased As concentration in the Fe-peat amended soil. Further sampling is on-going in order to determine whether or not the treatment is successful in a long-term.
|
|
| 2482. |
- Kumpiene, Jurate, et al.
(författare)
-
Contaminated soil for landfill covers : Risk mitigation by arsenic immobilization
- 2016
-
Ingår i: Arsenic Research and Global Sustainability. - London : CRC Press. - 9781315629438 ; , s. 579-580
-
Konferensbidrag (refereegranskat)abstract
- The aim of the study was to evaluate the risks of arsenic (As) spreading from soil that was used in a landfill cover. The As-contaminated soil was treated with iron, and a combination of iron and peat and placed in a pilot-scale landfill cover. The main exposure pathways concerning risks to human health and the environment were studied by analysing dissolved As in soil pore water, As phytotoxicity and bioaccessibility. The results showed that the stabilization of As-contaminated soil with a combination of Fe0and peat signifi-cantly reduced the As concentration in soil pore water, uptake by plants and improved the main morphological parameters of plants. The soil treatment also reduced the bioaccessibility As indicating the reduced risks to human health. Using Fe0amendment alone, the positive impact on the measured indicators was considerably smaller or not significant
|
|
| 2483. |
- Kumpiene, Jurate, et al.
(författare)
-
Editorial
- 2007
-
Ingår i: Ambio. - 0044-7447 .- 1654-7209. ; 36:6, s. 429-
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- During the last decades, contaminated soil has become of both public and scientific concern. National inventories have shown very large numbers of potentially contaminated sites originating from various industrial activities. Industrial technologies in the old days were often based on open systems designed without the insight of their being potential environmental threats. Legal actions taken against organizations responsible for water and air pollution have led to the development of new water and flue gas cleaning technologies. Today, contaminated land plays a major role in sustainable future land use, not only with regard to pollution resulting from old industrial activities but also with regard to the management of present industrial technologies and waste products.Issues related to contaminated soil are by definition interdisciplinary. In the Northern Sweden Soil Remediation Center (MCN), scientists from three universities (Umeå University, Luleå University of Technology, and Swedish University of Agricultural Sciences) and the Swedish Defense Research Agency (FOI) have focused on developing a detailed understanding of the mechanisms and processes in the soil system. Fundamental and applied research in collaboration with enterprises has been performed concerning critical knowledge gaps.The MCN was initiated in 2001 and consists of scientists, representatives from authorities, consultants, and entrepreneurs. The major goals of the MCN have been to increase the scientific basis for the risk assessment of contaminated soil and, by improved knowledge of the interactions between different contaminants and the soil system, to guide the development of remediation methods. New scientific results have been implemented by collaboration enterprises and authorities that have added strategic value for the whole sector in general.This issue of AMBIO summarizes the MCN's research activities, which have focused on inorganic and organic pollutant behavior, analytical methods, and risk assessments of brownfields. In addition, invited contributions from research groups outside the MCN have added other valuable aspects to the multidisciplinary research field.
|
|
| 2484. |
|
|
| 2485. |
- Kumpiene, Jurate, et al.
(författare)
-
Evaluation of the critical factors controlling stability of chromium, copper, arsenic and zinc in iron-treated soil
- 2007
-
Ingår i: Chemosphere. - : Elsevier BV. - 0045-6535 .- 1879-1298. ; 67:2, s. 410-417
-
Tidskriftsartikel (refereegranskat)abstract
- Various environmental factors are expected to affect the mobility of elements in chemically stabilized soils. The aim of this study was to evaluate the effects of pH, oxidizing–reducing potential (Eh), liquid-to-solid ratio (L/S), presence of organic matter (OM) and microbial activity (MA) on the mobility of chromium, copper, arsenic and zinc in zerovalent iron (Fe0)-stabilized soil. A 25 full factorial design was applied to assess the leaching of the elements from the treated soil. The factor having the most impact on the mobility of Cr, Cu and Zn was pH; low pH (3) led to the release of these elements. Arsenic remobilization was controlled by L/S and MA, whilst Eh, though also significant, had less influence. In the identified worst-case scenarios, more than half of the total Zn and Cu and 14% of As can be expected to remobilize from the treated soil. The leaching procedure concerning sample agitation and type of filtration showed to substantially affect the results of As leaching, especially in OM rich soil.
|
|
| 2486. |
- Kumpiene, Jurate
(författare)
-
Immobilisation of arsenic in landfilled soil using amendments
- 2012
-
Ingår i: Understanding the geological and medical interface of arsenic, As2012. - Boca Raton : CRC Press. - 9780415637633 ; , s. 326-327
-
Konferensbidrag (refereegranskat)abstract
- The aim of the study was to assess the leaching of Arsenic (As) from chemically stabilized soil using sulfur-containing amendments under simulated landfill conditions (anaerobic environment). Three soils from former wood impregnation plants containing 270-4590 mg/kg As were mixed either with Coal Fly Ash (CFA), Calcium Sulfate (CaSO 4) or Calcium Sulfide (CaS) (3 wt% each) and incubated for one month in an anaerobic environment. None of the soil amendments were effective to reduce As leaching in anaerobic environment to the levels that were measured in aerobic conditions
|
|
| 2487. |
|
|
| 2488. |
- Kumpiene, Jurate, et al.
(författare)
-
Immobilization of contaminants from bottom ashes : the role of soil organic matter
- 2003
-
Ingår i: Journal of Environmental Engineering and Landscape Management. - 1648-6897 .- 1822-4199. ; 11:1, s. 14-22
-
Tidskriftsartikel (refereegranskat)abstract
- The utilization of bottom ashes from municipal solid waste incineration (MSWI) in road constructions might cause environmental problems due to the release of toxic metals. The present work is aimed at studying the suitability of soil as a treatment facility of metals leached out from bottom ashes. A laboratory experiment with three types of soil (forest soil, peat and mould soil), and with sand as a reference substrate, was performed to determine the binding capacity of each substrate towards heavy metals, such as Cu and Cr(VI). The results indicated that all the substrates were capable of removing on average 99,3 % of Cu from the solution, while only peat showed a high retention of Cr(VI) (96,2 %). The retention of Cr(VI) was directly proportional to the soil organic matter (SOM) content, while the retention of Cu had no correlation with the SOM of the substrates. A high retention of Cu shown by sand was due to its high content of pH which could favor the precipitation of Cu(OH)2. A synergetic effect of Cu on the retention of Cr(VI) by sand and mould was detected, i.e. increasing concentrations of Cu in the solution increased the retention of Cr. In all the other cases there was no statistically significant interaction between the retention of Cu and Cr(VI) by the analysed substrates.
|
|
| 2489. |
|
|
| 2490. |
- Kumpiene, Jurate, et al.
(författare)
-
Impact of water saturation level on arsenic and metal mobility in the Fe-amended soil
- 2009
-
Ingår i: Chemosphere. - : Elsevier. - 0045-6535 .- 1879-1298. ; 74:2, s. 206-215
-
Tidskriftsartikel (refereegranskat)abstract
- The impact of water saturation level (oxidizing-reducing environment) on As and metal solubility in chromium, copper, arsenic (CCA)-contaminated soil amended with Fe-containing materials was studied. The soil was mixed with 0.1 and 1 wt% of iron grit (Fe(0)) and 1, 7 and 15 wt% of oxygen scarfing granulate (OSG, a by-product of steel processing). Solubility of As and metals was evaluated by a batch leaching test and analysis of soil pore water. Soil saturation with water greatly increased As solubility in the untreated as well as in the Fe-amended soil. This was related to the reductive dissolution of Fe oxides and increased concentration of As(III) species. Fe amendments showed As reducing capacity under both oxic and anoxic conditions. The cytotoxicity of the soil pore water correlated with the concentration of As(III). The Fe-treatments as well as water saturation of soil were less significant for the solubility of Cu, Cr and Zn than for As. The batch leaching test used for waste characterization substantially underestimated As solubility that could occur under water-saturated (anaerobic) conditions. In the case of soil landfilling, other techniques than Fe-stabilization of As containing soil should be considered.
|
|
