Effect of biochar on heavy metal immobilization and uptake by lettuce (Lactuca sativa L.) in agricultural soil

Kim, Hyuck Soo; Kim, Kwon Rae; Kim, Ho Jin; Yoon, Jung Hwan; Yang, Jae E.; Ok, Yong Sik; Owens, Gary; Kim, Kye Hoon

doi:10.1007/s12665-015-4116-1

Cited by 219 publications

(61 citation statements)

References 48 publications

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“…Potential sources of hazardous compounds include PAHs, polychlorinated dibenzodioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) [18], and toxins such as volatile organic compounds, xylenols, cresols, acrolein, and formaldehyde [56,103,111,112]. PAHs have been identified to be detrimental to plants and microbial organisms [113,114].…”

Section: Sources Of Hazards In Biocharmentioning

confidence: 99%

Risk Evaluation of Pyrolyzed Biochar from Multiple Wastes

Ndirangu

Liu

et al. 2019

Journal of Chemistry

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This paper aims at demonstrating the significance of biochar risk evaluation and reviewing risk evaluation from the aspects of pyrolysis process, feedstock, and sources of hazards in biochar and their potential effects and the methods used in risk evaluation. Feedstock properties and the resultant biochar produced at different pyrolysis process influence their chemical, physical, and structural properties, which are vital in understanding the functionality of biochar. Biochar use has been linked to some risks in soil application such as biochar being toxic, facilitating GHGs emission, suppression of the effectiveness of pesticides, and effects on soil microbes. These potential risks originate from feedstock, contaminated feedstock, and pyrolysis conditions that favor the creation of characteristics and functional groups of this nature. These toxic compounds formed pose a threat to human health through the food chain. Determination of toxicity levels is a first step in the risk management of toxic biochar. Various sorption methods of biochar utilized low-cost adsorbents, engineered surface functional groups, and nZVI modified biochars. The mechanisms of organic compound removal was through sorption, enhanced sorption, modified biochar, postpyrolysis thermal air oxidation and that of PFRs degradation was through activation, photoactive functional groups, magnetization, and hydrothermal synthesis. Emissions of GHGs in soils amended with biochar emanated through physical and biotic mediated mechanisms. BCNs have a significance in reducing the health quotient indices for PTEs risk contamination by suppressing cancer risk arising from consumption of contaminated food. The degree of environmental risk assessment of HM pollution in biomass and biochars has been determined by using potential ecological risk index and RAC while organic contaminant degradation by EPFRs was considered when assessing the environmental roles of biochar in regulating the fate of contaminants removal. The magnitude of technologies’ net benefit must be considered in relation to the associated risks.

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Section: Sources Of Hazards In Biocharmentioning

confidence: 99%

Risk Evaluation of Pyrolyzed Biochar from Multiple Wastes

Ndirangu

Liu

et al. 2019

Journal of Chemistry

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“…The contents of all elements except Cr in the stems, and Cd, Cu and Fe contents in leaves, were decreased by both types of biochar. A previous study found that rice biochar decreased the concentrations of Cd, Cu, Pb and Zn in the leaves of lettuce (Lactuca sativa) in a dosedependent manner [35]. Additionally, the effect of AMF inoculation on the heavy metal concentrations in stems and leaves was not associated with biochar application, and decreased the content of all elements in the stems and leaves.…”

Section: Discussionmentioning

confidence: 87%

Effects of Iron-Modified Biochar and AMF Inoculation on the Growth and Heavy Metal Uptake of Senna occidentalis in Heavy Metal-Contaminated Soil

Guo¹,

Li²

2019

Pol. J. Environ. Stud.

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S. occidentalis can be used in pharmacology and vegetation restoration. A pot experiment was conducted to study the effects of biochar and mycorrhizal fungus inoculation on plant growth and heavy metal accumulation. The mycorrhizal infection rate was increased by apple branch biochar but decreased by coconut husk iron-modified biochar. Conversely, soil pH was not affected by mycorrhizal inoculation but was increased by biochar. Compared to the uninoculated control, the combination of apple branch biochar and mycorrhizal inoculation significantly increased the growth of stems, leaves and roots by 226.46%, 163.15% and 86.00%, respectively. The application of apple branch biochar increased the root Pb content, while root Cd, Cr, Cu and Fe were decreased by 36.30%, 13.63%, 3.09% and 7.66%, respectively. Furthermore, the content of all elements in the stems and leaves also decreased. The application of iron-modified biochar alone increased the content of all the elements in the roots by 4.23-109.33%. But their contents in stems and leaves were decreased by iron-modified biochar and mycorrhizal inoculation alone. The combination of biochar and mycorrhizal inoculation most effectively promoted plant growth, enhanced heavy metal uptake by the roots and produced a barrier effect that reduced the transfer of heavy metals from the roots to the shoots. This might constitute a feasible means of promoting the safe utilization of S. occidentalis in phytoremediation.

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“…The pots were filled with a mixture of contaminated soil and washed sand with the ratio of 3:1, regarding to prevent soil compaction. Based on the previous research results [28,29], different ratios of soil amendments (0.5, 1, and 2% dry mass) were applied as different treatments. The amendments were thoroughly mixed with soils to obtain homogeneity were then equilibrated for 8 weeks.…”

Section: Pot Experimentsmentioning

confidence: 99%

The effects of biochar and inorganic amendments on soil remediation in the presence of hyperaccumulator plant

Nejad

Jung

2017

Int J Energy Environ Eng

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Industrialization advances have led to an increase soil contamination by heavy metals. Among different technologies, in situ stabilization of metals combined with revegetation attracted attention. Therefore, this study aimed at comparing effects of biochars [rice husk biochar (RHB), maple leaves biochar (MLB)] and common inorganic amendments [red mud (RM), and steel slag (SS)] at different rates (0.5, 1, and 2% w/w) on leaching, and phytoavailability of metals (assessed using mustard green ''Brassica juncea''). Soil pH in treated soils significantly (p \ 0.01) increased, with the optimal pH ranges for plant growth observed in biochar-treated soils. The leaching of Cd, Cu, Pb, and Zn through soil significantly (p \ 0.05) decreased in treated soils. Plant uptake and accumulation of Cd, Cu, Pb, and Zn decreased by 79-66, 13-19, 87-86, and 37-36% in RHB-and MLB-treated soils, respectively. Sequential extraction analysis pointed out that the major stabilization mechanism for metals using biochars involved the formation of organic and carbonate bonds, while for RM and SS was believed to involve the formation of inner sphere complexes with Fe/Al (hydr)oxides. The plant available fractions for Cd were generally higher than those for others. Overall, high dosage addition (2%) of each amendment offered the best compromise as it successfully reduced both leaching and phytoavailability of metals. Using MLB for the first time, showed promising results to immobilize metals with an increase in plant biomass.

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Effect of biochar on heavy metal immobilization and uptake by lettuce (Lactuca sativa L.) in agricultural soil

Cited by 219 publications

References 48 publications

Risk Evaluation of Pyrolyzed Biochar from Multiple Wastes

Risk Evaluation of Pyrolyzed Biochar from Multiple Wastes

Effects of Iron-Modified Biochar and AMF Inoculation on the Growth and Heavy Metal Uptake of Senna occidentalis in Heavy Metal-Contaminated Soil

The effects of biochar and inorganic amendments on soil remediation in the presence of hyperaccumulator plant

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