Multispecies and Monoculture Rhizoremediation of Polycyclic Aromatic Hydrocarbons (PAHs) from the Soil

Maila, Mphekgo P.; Randima, P.; Cloete, T.E.

doi:10.1080/16226510590950397

Cited by 34 publications

(9 citation statements)

References 20 publications

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“…Since the accumulations of PAHs by plants were actually reduced under mixed cropping, the enhanced degradation of PAHs in soils by mixed cropping was probably due to the improved soil physiochemical and biological conditions, such as aeration status, soil microbes and enzymes, root exudates, etc. (Lewis et al 2001;Maila et al 2005), though detailed mechanisms needs to be studied further. At same pollution level, phytoremediation for Pyr was always less efficient than Phe in spiked soils regardless of the cropping patterns.…”

Section: Discussionmentioning

confidence: 98%

Phytoremediation for soils contaminated by phenanthrene and pyrene with multiple plant species

Wei

Pan

2010

J Soils Sediments

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Purpose The remediation of soil polluted by polycyclic aromatic hydrocarbons (PAHs) is of great importance due to the persistence and carcinogenic properties of PAHs. Phytoremediation has been regarded as a promising alternative among suggested approaches. For the establishment of highly effective remediation method and better understanding of the remediation mechanisms by plants, the potentials of three plant species and their planting patterns on the remediation efficacy were studied by pot experiments. Materials and methods Soils were amended with phenanthrene (Phe) or pyrene (Pyr) at five levels ranging from 0∼322 mg kg -1 , then incubated for 30 days. At each level of PAHs, four treatments were set as: (a) treatments 1, no plant and microbe-inhibited with addition of 0.1%NaN 3 ; (b) treatments 2, no plant and without the addition of NaN 3 ; (c) treatments 3, microbe-inhibited and planted; (d) treatments 4, planted and without inhibition of microbes. For each planted treatment, single cropping of rape (Medicago sativa), alfalfa (Brassica campestris), and white clover (Trifolium repens), and mixed cropping of rape with alfalfa and white clover were adapted. Seedlings of 7 days old were then cultivated. After 70 days cultivation, soil and plant of each treatment were sampled for analyses of PAHs. Results and discussion Rape, alfalfa, and white clover all significantly promoted the degradation of PAHs in soils; alfalfa and white clover showed higher efficiencies for the removal of PAHs. Averagely, about 41.46% of Phe or 33.69% of Pyr were removed from soils after 70-day plantation of alfalfa, and 38.75% of Phe or 36.29% of Pyr removed by white clover, as compared to the much lower degradation rates of 22.57% of Phe or 18.24% of Pyr for non-planted controls. Mixed cropping significantly enhanced the remediation efficiencies as compared to single cropping; about 74.87% of Phe or 62.81% of Pyr were removed by mixed cropping of rape and alfalfa, and 72.01% of Phe or 68.44% of Pyr by mixed cropping of rape and white clover.Conclusions The presence of vegetation significantly promoted the dissipation of Phe or Pyr in soils and remediation efficiency varied greatly among plant species and cropping patterns. Rape had the lowest ability for the removal of PAHs, while alfalfa showed highest ability for the remediation of Phe and white clover was most effective for Pyr. Mixed cropping of rape with alfalfa or white clover was however far better for the remediation of soil PAHs than single cropping.

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Section: Discussionmentioning

confidence: 98%

Phytoremediation for soils contaminated by phenanthrene and pyrene with multiple plant species

Wei

Pan

2010

J Soils Sediments

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“…In addition, there are also ecological relationships, including mutualism or competition among soil microorganisms [35]. Some studies indicated that the effect of inoculation with a mixture of multiple microorganisms provided better results than a single strain [36,37]. Therefore, constructing a consortium with strain m318 as the core strain might be a practical approach to promote microbe-assisted As phytoextraction by P. vittata.…”

Section: Arsenite Oxidase Genes In the Rhizosphere Of P Vittatamentioning

confidence: 99%

Empirical Evidence of Arsenite Oxidase Gene as an Indicator Accounting for Arsenic Phytoextraction by Pteris vittata

Han

Yang

Shimomura

et al. 2022

IJERPH

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Arsenic (As) is a toxic semi-metallic element that is ubiquitous in the environment and poses serious human health risks. Phytoextraction by Pteris vittata is considered a low-cost and environmentally friendly approach to treat As-contaminated soil. P. vittata mainly absorbs arsenate thus the bioavailability of As to P. vittata depends on the chemical form of As. Microbial redox of As contributes to the biogeochemical cycling of As, and rhizobacterium-assisted phytoextraction by P. vittata was proposed. In this study, this microbe-assisted phytoextraction was applied to two fields, and the effectiveness of phytoextraction was evaluated. The results revealed that P. vittata was able to grow in temperate and subarctic climate zones. The biomass was influenced by the weather, and the As concentration in plants was dependent on the As content in the soil. The ratio of arsenite oxidase genes (aioA-like genes) to 16S rRNA genes was employed to evaluate the effect of As phytoextraction, and the results exhibited that the ratio was related to the As concentration in P. vittata. Our results showed that arsenite oxidation in the rhizosphere might not be achieved by single-strain inoculation, while this study provided empirical evidence that the rhizospheric aioA-like genes could be an indicator for evaluating the effectiveness of As phytoextraction.

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“…In the case a huge expanse of land, a consociation of grasses could be a good solution. Work by Maila et al (2005) demonstrated the potential of the grass species Brachiaria serrata and Eleusine corocana in decontaminating PAHs-contaminated soil. It was found that after a ten-week treatment the naphthalene concentration was undetectable in the "multispecies" vegetated soil compared to 96% removal efficiency in the monoplanted treatment and 63% in the control.…”

Section: Consociationsmentioning

confidence: 99%

A review of the performance of woody and herbaceous ornamental plants for phytoremediation in urban areas

Capuana¹

2020

iForest

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Biogeosciences and Forestry Biogeosciences and Forestry A review of the performance of woody and herbaceous ornamental plants for phytoremediation in urban areas Maurizio Capuana Urban and periurban areas are often contaminated by several pollutants. Phytoremediation is considered to be an effective and eco-friendly strategy for the restoration of these contaminated lands. For this purpose, the exploitation of ornamental plants could be an additional option, due to their positive impact on the landscape. In this paper, we reviewed a selection of species which have been proposed for utilization in phytoremediation. Several tree species have been introduced in the past into urban environments for parks, gardens and avenues, with a selection studied for their capacity to absorb, tolerate, and translocate contaminants. Shrubby and herbaceous species are also commonly exploited for their ornamental features and are now studied for phytoremediation purposes. The responses of several effective species to the presence of heavy metals or dangerous organic compounds in the growth substrate are examined in this paper.

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Multispecies and Monoculture Rhizoremediation of Polycyclic Aromatic Hydrocarbons (PAHs) from the Soil

Cited by 34 publications

References 20 publications

Phytoremediation for soils contaminated by phenanthrene and pyrene with multiple plant species

Phytoremediation for soils contaminated by phenanthrene and pyrene with multiple plant species

Empirical Evidence of Arsenite Oxidase Gene as an Indicator Accounting for Arsenic Phytoextraction by Pteris vittata

A review of the performance of woody and herbaceous ornamental plants for phytoremediation in urban areas

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