Biochar enhanced phytostabilization of heavy metal contaminated mine tailings: A review

Shi, Yanfeng; Zang, Yufei; Yang, Huanhuan; Zhang, Xu; Shi, Jinmiao; Zhang, Jie; Liu, Bing

doi:10.3389/fenvs.2022.1044921

Cited by 17 publications

(4 citation statements)

References 138 publications

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“…The BC further reduced heavy metal concentrations beyond the effect of lime, as indicated by reduced Zn with 0.5% lime in Experiment 2 (Figure S6). BC was shown in several studies to decrease available heavy metals in soils (Ippolito et al., 2019; Phillips et al, 2016; Shi et al., 2022). In addition, the increase in needle K with BC (Figure 4) confirmed that BC also can provide certain essential plant nutrients, especially K (Wang et al., 2018).…”

Section: Discussionmentioning

confidence: 97%

Designing amendments to improve plant performance for mine tailings revegetation

Johnson,

Olszyk,

Shiroyama

et al. 2023

Agrosystems Geosci & Env

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To provide recommendations for establishment of plants on low‐pH Formosa Mine tailings, two greenhouse experiments were conducted to evaluate the use of remedial amendments to improve the survival and growth of Douglas fir (Pseudotsuga menziesii) seedlings. A preliminary experiment indicated that 1% lime (by weight) raised tailings pH, permitting seedling survival. However, high rates of biosolid application (BS; 2% by weight) added to supply nutrients were phytotoxic when added with lime. A gasified conifer biochar (BC) added to tailings at 1%, 2.5%, or 5% (by weight), along with lime and BS, caused an additional increase in pH, decreased electrical conductivity (EC), and tended to increase the survival of Douglas fir. The addition of a locally sourced microbial inoculum (LSM) did not affect survival. A subsequent experiment expanded our experimental design by testing multiple levels of amendments that included lime (0.5% and 1% by weight), three application rates (0.2%, 0.5%, and 2%) of two nutrient sources (BS or mineral fertilizer), BC (0% and 2.5%), and with or without LSM. There were many interactions among amendments. In general, Douglas fir survival was enhanced when lime and BC were added. These experiments suggest that amending with lime, a nutrient source, and BC would enhance revegetation on low‐pH, metal‐contaminated mine tailings.

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Section: Discussionmentioning

confidence: 97%

Designing amendments to improve plant performance for mine tailings revegetation

Johnson,

Olszyk,

Shiroyama

et al. 2023

Agrosystems Geosci & Env

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“…Also, Trichoderma, a type of soil fungus, can bond to soil particles by mycelium or act as a binding agent in soil particles by secreting insoluble extracellular substances. This action improves the soil's Porosity and water-holding capacity (Shi et al, 2022).…”

Section: Available Water Content (Awc)mentioning

confidence: 99%

Influence of some polymers and microorganisms on the soil physical properties under drought conditions

Negim,

Moharam,

Thabit

et al. 2023

Journal of Sohag Agriscience (JSAS)

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This study evaluated the effects of two Super Absorbent Polymers (SAPs) types, P1 and P2, and four microbial isolates (Trichoderma harzianum, two Actinomycetes sp., and Bacillus subtilis) on improving some soil physical properties. The results showed that SAP application, alone or in combination with microbes, significantly reduced bulk density by 6.1% and increased porosity by 5.2% compared to the control. Specifically, the P1C (P1 polymer + Actinomycetes 1) treatment increased water holding capacity by 48.7%, field capacity by 169.4%, permanent wilting point by 180.5%, and available water by 149.8% compared to control based on data from the results. The P1C treatment improved soil properties and moisture characteristics. The synergistic effect of polymers and microbes emerged as an effective strategy to modify soil properties. This study provides valuable insights into using SAP-microbe amendments to enhance soil physical properties, water availability, and agricultural productivity in drought conditions.

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“…This can be attributed to the high-water retention and less oxygen in the pore space leading to an anaerobic state of the plant roots. Also, the high adsorption capacity at the early stages, reduces the release of nutrients thereby leading to lack of fertilisers in the later stages (Shi et al, 2022).…”

Section: Translocation and Bioconcentration Of Heavy Metals Biochar A...mentioning

confidence: 99%

Influence of biochar amendment on removal of heavy metal from soils using phytoremediation by C. roseus and Chrysopogon zizanioides

Deka,

Patwa,

Nair

et al. 2024

Preprint

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Advances in sustainable toxic heavy metal treatment technologies are crucial to meet our needs for safer land to develop an urban resilient future. The heavy metals bioaccumulate in the food chain due to its persistence in the soil, which poses a serious challenge to its removal and control. Utilisation of hyperaccumulators to reduce the mobility, accumulation, and toxic impact of heavy metals is a promising and ecologically safe technique. Amendments such as biochar, compost and chelates have shown to enhance the phytoremediation efficiency. The potential soil improvement is influenced by the properties of the amendment, plant and metal heterogeneities. In this study, an organic biochar amendment for the 60-day pot experiment using C. roseus, Chrysopogon zizanioides in a heavy metal contaminated soil was applied. The influence of biochar prepared from sugarcane bagasse biochar on phytoremediation of Pb, Zn and Cd from the soil was explored. Biochar amendment rate of 2% had significant effect on the improvement of the morphological characteristics of the plants in comparison to the control. The soil potassium concentrations increased with amendment rates, while the ammonia and phosphorous reduced beyond an optimum biochar content. Heavy metal concentrations in the soil were consistently lower in the amended soil for both plants. The translocation factor (TF) and bioconcentration factor (BCF) exhibited the phytoextraction and phytostabilisation potential of the plants. However, it remains specific to each contaminant, plant and amendment rate. The insights from this study establishes that the synergy between biochar amendment and the selected medicinal plants improved the phytoremediation efficiency.

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Biochar enhanced phytostabilization of heavy metal contaminated mine tailings: A review

Cited by 17 publications

References 138 publications

Designing amendments to improve plant performance for mine tailings revegetation

Designing amendments to improve plant performance for mine tailings revegetation

Influence of some polymers and microorganisms on the soil physical properties under drought conditions

Influence of biochar amendment on removal of heavy metal from soils using phytoremediation by C. roseus and Chrysopogon zizanioides

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