A pilot study on using biochars as sustainable amendments to inhibit rice uptake of Hg from a historically polluted soil in a Karst region of China

Xing, Ying; Wang, Jianxu; Xia, Jicheng; Liu, Zhen-Mei; Zhang, Yonghang; Du, Yangong; Wei, Wan-Li

doi:10.1016/j.ecoenv.2018.11.111

Cited by 60 publications

(20 citation statements)

References 63 publications

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“…Numerous researchers report that the seed germination [ 20 ], plant growth [ 21 , 22 , 23 ], crop yields [ 23 , 24 ], and microbial activity and population [ 22 , 25 , 26 ] have been significantly increased in the HM-contaminated soil amended with biochars. Meanwhile, the effects of biochar on the immobilization/mobilization for different kinds of HMs have been confirmed in many pot experiments and field trials [ 21 , 27 , 28 , 29 ]. Furthermore, the production process of biochar is regarded as an efficient management method to dispose of a large number of organic wastes, which shows certain advantages in economic benefits and feasibility aspects.…”

Section: Introductionmentioning

confidence: 94%

“…As Wang et al [ 31 ] remarked, the carboxyl group in a hardwood-derived biochar surface and soil Hg(Ⅱ) ion develop a coordination reaction generating a complex of -COOHg + precipitate, thereby reducing the mobility of Hg and the thiol functionalities and sulfoxide groups are also able to react with Hg(Ⅱ) ion to form -S(Hg)- and [Hg(OSR 2 ) 6 2+ ] precipitates. Additionally, Xing et al [ 28 ] found that rice-husk-derived biochar possesses a higher sulfate concentration compared with wheat-straw-derived biochar, which is more effective to promote the mercury–sulfur coordination reaction and to produce sulfides precipitation. It is extremely important to know that methylation of Hg is a special environmental biogeochemical behavior, and once the inorganic-Hg in soils is converted into methylmercury (MeHg), its toxicity and bioaccumulation will be enormously enhanced [ 108 ].…”

Section: Remediation Of Soil Hms Contamination By Biocharmentioning

confidence: 99%

“…Meier et al [ 36 ] indicated that 5% chicken-manure-derived biochar can reduce the uptake of Cu from 66.9 mg kg −1 to 36.6 mg kg −1 in the aboveground part of Oenothera picensis plants in copper-mine-polluted soil, and increase the biomass of shoots and roots by 3.5 times and 3.1 times respectively. Xing et al [ 28 ] reported that after applying 24 t ha −1 and 72 t ha −1 rice-husk-derived biochar to mercury-contaminated farmland soils, the Hg content in rice grains reduced to 10 ng g −1 and 7.2 ng g −1 , which significantly inhibited the transportation of Hg from soil to rice grains, and successfully reached the national standard (below 20 ng g −1 ). Similarly, Li et al [ 97 ] applied 3% of soybean-straw-derived biochar (hydrothermal carbon at 350℃) to the arsenic and cadmium co-contaminated farmland soil, which reduced the bioaccumulation of As in rice plants by 88%.…”

Section: Remediation Of Soil Hms Contamination By Biocharmentioning

confidence: 99%

“…Figure 2 briefly introduced the advantages and disadvantages of biochar in the remediation of soil HM contamination. Firstly, it is reported that biochar may be the carrier of HMs [ 116 ], volatile organic compounds (VOCs) [ 117 ], dioxin (PCDD/Fs) and polycyclic aromatic hydrocarbons (PAHs) [ 118 , 119 ] and other toxic substances, and the demands for remediation of HM contamination in soil varies from 1.5 to 72 t ha −1 or even higher [ 24 , 28 , 98 , 113 ]. Therefore, the toxic substances may be released into the soil/air/water environment with the application of the double-edged biochar, which will pose a secondary pollution and ecological risk.…”

Section: Potential Risksmentioning

confidence: 99%

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Application Research of Biochar for the Remediation of Soil Heavy Metals Contamination: A Review

Cheng

Chen

Xu³

et al. 2020

Molecules

106

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Soil contamination by heavy metals threatens the quality of agricultural products and human health, so it is necessary to choose certain economic and effective remediation techniques to control the continuous deterioration of land quality. This paper is intended to present an overview on the application of biochar as an addition to the remediation of heavy-metal-contaminated soil, in terms of its preparation technologies and performance characteristics, remediation mechanisms and effects, and impacts on heavy metal bioavailability. Biochar is a carbon-neutral or carbon-negative product produced by the thermochemical transformation of plant- and animal-based biomass. Biochar shows numerous advantages in increasing soil pH value and organic carbon content, improving soil water-holding capacity, reducing the available fraction of heavy metals, increasing agricultural crop yield and inhibiting the uptake and accumulation of heavy metals. Different conditions, such as biomass type, pyrolysis temperature, heating rate and residence time are the pivotal factors governing the performance characteristics of biochar. Affected by the pH value and dissolved organic carbon and ash content of biochar, the interaction mechanisms between biochar and heavy metals mainly includes complexation, reduction, cation exchange, electrostatic attraction and precipitation. Finally, the potential risks of in-situ remediation strategy of biochar are expounded upon, which provides the directions for future research to ensure the safe production and sustainable utilization of biochar.

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Section: Introductionmentioning

confidence: 94%

Section: Remediation Of Soil Hms Contamination By Biocharmentioning

confidence: 99%

Section: Remediation Of Soil Hms Contamination By Biocharmentioning

confidence: 99%

Section: Potential Risksmentioning

confidence: 99%

See 2 more Smart Citations

Application Research of Biochar for the Remediation of Soil Heavy Metals Contamination: A Review

Cheng

Chen

Xu³

et al. 2020

Molecules

106

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“…Other species cannot accumulate significant amounts of metals in the aerial parts but can stabilize them in the rhizosphere or on the root epidermis, as demonstrated by previous investigations for Vallisneria americana [25], Phragmites australis [26], Solanum lycopersicum [27], Lycopersicon esculentum [28], Euphorbia pithyusa L. [29], Pistacia lentiscus [30], and Juncus acutus [20,31]. These species cannot be harvested for metal recovery but could be reused for the biochar production that in turn can be employed in soil amendment/remediation [32,33]. This application has different ecological outcomes such as, stabilizing pollutants, making productive unused polluted lands, and solving the problem of biomass storage that, even if weakly contaminated, could produce metal leaching.…”

Section: Introductionmentioning

confidence: 98%

XRD-Thermal Combined Analyses: An Approach to Evaluate the Potential of Phytoremediation, Phytomining, and Biochar Production

Fancello

Scalco

Medas

et al. 2019

IJERPH

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A method for evaluating the potential of reuse of biomasses for economic purposes is here presented starting from a case study. Juncus acutus plants and rhizospheres were harvested from abandoned Zn–Pb mine areas of southwest Sardinia (Italy). Thermogravimetry and Differential Thermal analyses were performed to evaluate the temperatures at which significant reactions occur. X-ray Diffraction (XRD) analysis was carried out on raw samples and on samples heated ex-situ (by a conventional diffractometer) or in-situ (by synchrotron-based diffraction). Raw samples mainly consist of quartz, phyllosilicates, and feldspars with minor amounts of sulfides, sulfates, and Fe, Pb, and Zn carbonates, concentrated in the rhizosphere. After heating, Zn and Fe oxides and willemite are observed in internal roots and stems, revealing the presence of these metals in the plant tissues. In-situ heating was less effective than ex-situ in revealing minor phases in organic samples, probably because the scarcity of oxygen within the sample holder did not allow the degradation of organic compounds and the oxidation of sulfides, resulting in a low quality XRD signal even if obtained with the high resolution ensured by a synchrotron light source. This method can be applied to plants from polluted sites for metal exploitation, and/or to biomasses from unpolluted sites for biochar production, since both applications take advantage of the knowledge of the minerals formed after heating.

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Pathogen and heavy metal contamination in urban agroecosystems of northern Ghana: Influence of biochar application and wastewater irrigation

et al. 2021

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The benefit of biochar as a soil fertility enhancer is well known and has been broadly investigated. Equally, many tropical and subtropical countries use wastewater for irrigation in urban agriculture. To assess the related health risks, we determined pathogen and heavy metal fate associated with biochar application and wastewater irrigation in the urban agriculture of northern Ghana. Rice (Oryza L.) husk biochar (20 t ha−1), N–P–K 15–15–15 fertilizer (212.5 kg ha−1), and their combinations were evaluated in a field‐based experiment. Untreated wastewater and tap water served as irrigation water. Red amaranth (Amaranthus cruentus L.) was used as a test crop and was grown in wet (WS) and dry (DS) cropping seasons. Irrigation water, soil, and vegetables were analyzed for heavy metals, Escherichia coli, fecal coliform, helminth eggs, and Salmonella spp. Unlike the pathogens, analyzed heavy metals from irrigation water and soil were below the FAO/WHO permissible standard for agricultural activities. Wastewater irrigation caused E. coli concentrations ranging from 0.5 to 0.6 (WS) and from 0.7 to 0.8 (DS) log10 colony forming units per gram fresh weight (CFU gFW−1) on vegetables and from 1.7 to 2.1 (WS) and from 0.6 to 1.0 (DS) log10CFU per gram dry weight (gDW−1) in soil. Average log10CFU gFW−1 rates of 6.19 and 3.44 fecal coliform were found on vegetables, whereas in soil, 4.26 and 4.58 log10CFU gDW−1 were observed in WS and DS, respectively. Helminth egg populations were high in wastewater and were transferred to the crops and soil. Biochar did not affect bacteria contamination. Pathogen contamination on vegetables and in soil were directly linked to the irrigation water, with minimal or no difference observed from biochar application.

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A pilot study on using biochars as sustainable amendments to inhibit rice uptake of Hg from a historically polluted soil in a Karst region of China

Cited by 60 publications

References 63 publications

Application Research of Biochar for the Remediation of Soil Heavy Metals Contamination: A Review

Application Research of Biochar for the Remediation of Soil Heavy Metals Contamination: A Review

XRD-Thermal Combined Analyses: An Approach to Evaluate the Potential of Phytoremediation, Phytomining, and Biochar Production

Pathogen and heavy metal contamination in urban agroecosystems of northern Ghana: Influence of biochar application and wastewater irrigation

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