The influence of dissolved organic carbon on sorption of heavy metals on urea-treated pine bark

Khokhotva, Оleksandr; Waara, Sylvia

doi:10.1016/j.jhazmat.2009.08.149

Cited by 40 publications

(15 citation statements)

References 28 publications

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“…Adsorption of the studied heavy metals by UTB was up to 30% higher compared to NTB ( Table 1), confirming earlier results [4]. Leaching of Cu and Ni was not detected in blank leachates using flame atomization neither in NTB nor in UTB bark samples.…”

Section: Adsorption and Leaching Of Heavy Metalssupporting

confidence: 88%

“…Processes of aerobic degradation of bark can occur in wet adsorbent, which promotes leaching of DOC (Dissolved Organic Carbon). It has been previously found that among studied metals, adsorption and desorption of Cu was the most sensitive to the presence of dissolved organic substances with enhanced copper desorption even at a very small DOC concentration [4]. NTB -non-treated bark; UTB -bark treated with 5% urea-solution; W -bark was kept wet before leaching test; D -bark was air-dried before leaching test; F -bark was frozen (being in wet condition) before leaching tests; DF -bark was first dried and then frozen before leaching test; FD -bark was first frozen (being in wet condition) and then air-dried before leaching test…”

Section: Adsorption and Leaching Of Heavy Metalsmentioning

confidence: 97%

“…Pine bark has been shown to be a low cost sorbent which has a high capacity to adsorb heavy metals, and is readily available in the Nordic countries [2,3]. Treatment of pine bark with 5%-urea solution significantly promotes heavy metal adsorption and greatly reduces the desorption of adsorbed metals [4].…”

Section: Introductionmentioning

confidence: 99%

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The Impact of Changing Environmental Conditions on the Retention of Heavy Metals Adsorbed by Pine Bark

Khokhotva¹

2017

Eco-Tech

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Landfills are widely used for the disposal of households' and industrial waste. Liquid landfill effluents contain heavy metals, are toxic to humans and ecosystems and have to be efficiently treated. One treatment option that is becoming popular is the reactive filter technology. The total efficiency of metal removal by a filter media greatly depends not only on adsorption itself, but also on the metal leaching from the adsorbent. The last parameter, in turn, may be dependant on changing environmental conditions since filters are usually located on open air and flow of contaminated water (landfill leachate, runoff water) has the intermittent nature. A filter material may dry, become frozen or stay wet, depending on a season. Previously adsorbed metals can leach from an adsorbent at the next flash of water, coming to water treatment facilities. Among others, pine bark has shown a high capacity to adsorb heavy metals from landfill leachates. In this study, pine bark has been pre-treated with urea-solution in order to increase its stability and adsorption properties. Within leaching experiments using either non-treated or pre-treated bark samples no significant influence of the changing environmental conditions on the extent of metal leaching was observed, though in most cases, metal leaching from wet bark samples exposed to freezing was somewhat higher. Zn leaching was the highest and Cu leaching the lowest for both NTB and UTB samples. The metal leaching from non-treated bark was several-fold higher compared to urea-treated bark. Possible mechanisms of barkurea interactions and reasons for enhanced metals adsorption by urea-modified bark are discussed.

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Section: Adsorption and Leaching Of Heavy Metalssupporting

confidence: 88%

Section: Adsorption and Leaching Of Heavy Metalsmentioning

confidence: 97%

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The Impact of Changing Environmental Conditions on the Retention of Heavy Metals Adsorbed by Pine Bark

Khokhotva¹

2017

Eco-Tech

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“…As in the treatment without liming, Cu and Pb were both correlated with DOC (r≥0.503, p = 0.000), indicating that metal complexation with organic compounds contributed to the higher concentrations of these metals in pore water. This agrees with Strobel et al (2001), who pointed out that, at pH>6, almost all the soluble Cu is complexed by dissolved organic ligands, and with Khokhotva and Waara (2010), who found that metal affinity to dissolved organic matter decreases in the sequence Cu>Pb>Ni>Zn.…”

Section: Fruticosasupporting

confidence: 90%

Dynamics of nitrogen, phosphorus and metals in eutrophic wetlands affected by mine wastes. Effects of liming on plant growth and metals mobility

González¹,

Nazaret²

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and water-soluble organic carbon in the soil solution were regularly monitored. Before and after the flooding period, a soil P-fractionation was performed.-In relation to N dynamics, the NO 3 concentrations in the soil solution decreased between 70 and 90% by the second day of flooding, except in the unvegetated pots with the soil of pH~6.2. Denitrification was the main mechanism associated to the removal of NO 3 -. The role of vegetation in improving the rhizospheric environment was relevant in the soil of pH~6.2 because higher sand content, lower pH, and higher soluble metal concentrations might strongly hinder microbial activity.-In relation to P dynamics, the PO 4 3concentrations in the soil solution decreased between 80 and 90% after three hours of flooding, with and without vegetation. The Fe/Mn/Al oxides and the Ca/Mg compounds played an important role in soil P retention. In the pots with S. fruticosa, the reductive conditions induced P release from metal oxides and P retention to Ca/Mg compounds. In turn, P. australis may have favoured the release of P from carbonates, which was transferred to Fe/Mn/Al compounds. In the second experiment, soils with fine texture from the Marina del Carmolí (in this case of pH~6.4) and sandy soils from the Lo Poyo salt marsh (in this case of pH~3.1) were used. Each type of polluted soil was mixed with a lime amendment (dose of 20 g kg -1 ), assaying two treatments: non-limed and limed soil. Cuttings of S. fruticosa were planted in pots prepared with the soil treatments. The pots were irrigated for 10 months with eutrophic water and soluble metal concentrations (Al, Cd, Mn, Pb, and Zn) and plant survival, plant biomass, and plant metal content were determined. The lime amendment decreased the concentrations of soluble metals and favoured the growth of S. fruticosa, enhancing the capacity of the plant to phytostabilise metals in roots. In the third experiment, soils with fine texture from the Marina del Carmolí (in this case of pH~6.4) and sandy soils from the Lo Poyo salt marsh (in this case of pH~3.1) were used. Each type of polluted soil was mixed with a lime amendment (dose of 20 g kg -1 ). Simulated soil profiles (60 cm depth) were constructed and four treatments were assayed: without liming + without plant, without liming + with plant, with liming + without plant, and with liming + with plant. The plant species employed was S. fruticosa. Three horizons were differentiated in the soil profiles: A (never under water), C1 (alternating flooding-drying conditions), and C2 (always under water). The pH, Eh, and soluble metal concentrations (Cd, Cu, Fe, Mn, Pb, and Zn) were measured regularly at each depth for 18 weeks. At the end of the experiment a soil metalfractionation was applied. The lime amendment favoured the growth of S. fruticosa, an increase in pH, and a drop in Eh. -In relation to Fe dynamics, liming decreased Fe solubility, mainly in the soil of pH~3.1, but also facilitated a drop in Eh, favouring the dissolution of amorphous Fe oxides and hence increasing the c...

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“…However, there was no universal consensus on the influence of organic amendments on metal bioavailability in contaminated soils. Some results demonstrated that organic material addition enhanced metal mobility in soils and restrained plant growth (Clemente et al 2007;Khokhotva and Waara 2010). Furthermore, the investigation by other researchers (Pietikainen et al 2000;Lee et al 2004) demonstrated that the addition of organic fertilizer could statistically reduce metal bioavailability, but the amount of metal accumulation in plant tissues increased for the increasing biomass.…”

Section: Introductionmentioning

confidence: 98%

Evaluation of organic amendment on the effect of cadmium bioavailability in contaminated soils using the DGT technique and traditional methods

Yao

Sun

Wang

et al. 2015

Environ Sci Pollut Res

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Organic amendments have been widely proposed as a remediation technology for metal-contaminated soils, but there exist controversial results on their effectiveness. In this study, the effect of pig manure addition on cadmium (Cd) bioavailability in Cd-contaminated soils was systematically evaluated by one dynamic, in situ technique of diffusive gradients in thin films (DGT) and four traditional methods based on the equilibrium theory (soil solution concentration and the three commonly used extractants, i.e., acetic acid (HAc), ethylenediamine tetraacetic acid (EDTA), and calcium chloride (CaCl). Wheat and maize were selected for measurement of plant Cd uptake. The results showed that pig manure addition could promote the growth of two plants, accompanied by increasing biomasses of shoots and roots with increasing doses of pig manure addition. Correspondingly, increasing additions of pig manure reduced plant Cd uptake and accumulation, as indicated by the decreases of Cd concentrations in shoots and roots. The bioavailable concentrations of Cd in Cd-contaminated soils reflected by the DGT technique obviously decreased with increasing doses of pig manure addition, following the same changing trend as plant Cd uptake. Changes in soil solution Cd concentration and extractable Cd by HAc, EDTA, and CaCl in soils were similar to DGT measurement. Meanwhile, the capability of Cd resupply from solid phase to soil solution decreased with increasing additions of pig manure, as reflected by the decreases in the ratio (R) value of C to C. Positive correlations were observed between various bioavailable indicators of Cd in soils and Cd concentrations in the tissues of the two plants. These findings provide stronger evidence that pig manure amendment is effective in reducing Cd mobility and bioavailability in soils and it is an ideal organic material for remediation of Cd-contaminated soils.

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The influence of dissolved organic carbon on sorption of heavy metals on urea-treated pine bark

Cited by 40 publications

References 28 publications

The Impact of Changing Environmental Conditions on the Retention of Heavy Metals Adsorbed by Pine Bark

The Impact of Changing Environmental Conditions on the Retention of Heavy Metals Adsorbed by Pine Bark

Dynamics of nitrogen, phosphorus and metals in eutrophic wetlands affected by mine wastes. Effects of liming on plant growth and metals mobility

Evaluation of organic amendment on the effect of cadmium bioavailability in contaminated soils using the DGT technique and traditional methods

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