Bioremediation of PAHs and VOCs: Advances in clay mineral–microbial interaction

Biswas, Bhabananda; Sarkar, Binoy; Rusmin, Ruhaida; Naidu, Ravi

doi:10.1016/j.envint.2015.09.017

Cited by 119 publications

(40 citation statements)

References 166 publications

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“…possesses relevant degradation enzymes) should be present in soil; the contaminant must be bioavailable or become bioavailable, and environmental factors must permit the biodegradation process 133,142,145,146 . Microbial mineralisation of HOCs is limited by HOCs' desorption kinetics, especially in long-term contaminated soils, thereby supporting its biphasic nature 91 .…”

Section: Biodegradation Of Hocs In Historically Contaminated Soilsmentioning

confidence: 99%

Residual hydrophobic organic contaminants in soil: Are they a barrier to risk-based approaches for managing contaminated land?

Umeh

Duan

Naidu

et al. 2017

Environment International

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Risk-based approaches to managing contaminated land, rather than approaches based on complete contaminant removal, have gained acceptance as they are likely to be more feasible and cost effective. Risk-based approaches aim to minimise risks of exposure of a specified contaminant to humans. However, adopting a risk-based approach over alternative overly-conservative approaches requires that associated uncertainties in decision making are understood and minimised. Irrespective of the nature of contaminants, a critical uncertainty is whether there are potential risks associated with exposure to the residual contaminant fractions in soil to humans and other ecological receptors, and how they should be considered in the risk assessment process. This review focusing on hydrophobic organic contaminants (HOCs), especially polycyclic aromatic hydrocarbons (PAHs), suggests that there is significant uncertainty on the residual fractions of contaminants from risk perspectives. This is because very few studies have focused on understanding the desorption behaviour of HOCs, with few or no studies considering the influence of exposure-specific factors. In particular, it is not clear whether the exposure of soil-associated HOCs to gastrointestinal fluids and enzyme processes release bound residues. Although, in vitro models have been used to predict PAH bioaccessibility, and chemical extractions have been used to determine residual fractions in various soils, there are still doubts about what is actually being measured. Therefore it is not certain which bioaccessibility method currently represents the best choice, or provides the best estimate, of in vivo PAH bioavailability. It is suggested that the fate and behaviour of HOCs in a wide range of soils, and that consider exposure-specific scenarios, be investigated. Exposure-specific scenarios are important for validation purposes, which may be useful for the development of standardised methods and procedures for HOC bioaccessibility determinations. Research is needed to propose the most appropriate testing methods and for assessing potential risks posed by residual fractions of HOCs. Such investigations may be useful for minimising uncertainties associated with a risk-based approach, so that consideration may then be given to its adoption on a global scale. This review critically appraises existing information on the bioavailability of HOC residues in soil to establish whether there may be risks from highly sequestered contaminant residues.

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Section: Biodegradation Of Hocs In Historically Contaminated Soilsmentioning

confidence: 99%

Residual hydrophobic organic contaminants in soil: Are they a barrier to risk-based approaches for managing contaminated land?

Umeh

Duan

Naidu

et al. 2017

Environment International

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“…Soil mineral-microbial interactions are the most basic biogeochemical effects [3,4]. Microbial metabolic activities play an important role in the elemental cycling, formation, and transformation, as well as the weathering of the earth's environment [5]. In recent years, the interaction between soil minerals and microbes has become a hot topic in related disciplines.…”

Section: Introductionmentioning

confidence: 99%

Effects of Montmorillonite on the Mineralization and Cementing Properties of Microbiologically Induced Calcium Carbonate

Zhu¹,

Li²,

Shi³

et al. 2017

Advances in Materials Science and Engineering

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Carbonate mineralization microbe is a microorganism capable of decomposing the substrate in the metabolic process to produce the carbonate, which then forms calcium carbonate with calcium ions. By taking advantage of this process, contaminative uranium tailings can transform to solid cement, where calcium carbonate plays the role of a binder. In this paper, we have studied the morphology of mineralized crystals by controlling the mineralization time and adding different concentrations of montmorillonite (MMT). At the same time, we also studied the effect of carbonate mineralized cementation uranium tailings by controlling the amount of MMT. The results showed that MMT can regulate the crystal morphology of calcium carbonate. What is more, MMT can balance the acidity and ions in the uranium tailings; it also can reduce the toxicity of uranium ions on microorganisms. In addition, MMT filling in the gap between the uranium tailings made the cement body more stable. When the amount of MMT is 6%, the maximum strength of the cement body reached 2.18 MPa, which increased by 47.66% compared with that the sample without MMT. Therefore, it is reasonable and feasible to use the MMT to regulate the biocalcium carbonate cemented uranium tailings.

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“…The contamination of soil and groundwater has been identified in more than five (5) millions sites around the world, with 67% of them contaminated by organic compounds [13], and the same is observed at the UGHRI-5 contaminated sites. Petroleum products, such as aliphatic hydrocarbons or total petroleum hydrocarbons (TPHs) are components of gasoline, kerosene and lubricants.…”

Section: Organic Contaminants Identified At Ugrhi-5mentioning

confidence: 97%

Contaminated urban land: a situational analysis

Souza¹,

Bettine²,

Borges³

2016

WIT Transactions on Ecology and the Environment

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In the XXI century, urbanization poses to humankind as the main novelty and as an irreversible phenomenon. Currently, more than half of the world population lives in cities and it is estimated that by 2030 this ratio will reach two thirds. Several surveys indicate a direct relationship between urban growth and pollution, identifying urbanization as one of the major causes of the contamination of soil, groundwater and surface water resources. Soil contaminated by anthropogenic activities has been a global concern because where there is soil exposure to harmful substances there are risks to human health and to the environment. This work presents an analysis and discussion of the existing soil contamination in a densely urbanized and highly industrialized area in southeast Brazil. It was observed that in the last ten years the number of polluted areas has increased linearly and on 74 percent of these more than one type of contaminant has been identified, many of them considered to be carcinogenic to humans. It was concluded that the number of remediation processes in the area is incipient and as a function of complex mixtures of chemical compounds specific remediation techniques will be necessary due to the combined effects of these compounds in the long term.

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Bioremediation of PAHs and VOCs: Advances in clay mineral–microbial interaction

Cited by 119 publications

References 166 publications

Residual hydrophobic organic contaminants in soil: Are they a barrier to risk-based approaches for managing contaminated land?

Residual hydrophobic organic contaminants in soil: Are they a barrier to risk-based approaches for managing contaminated land?

Effects of Montmorillonite on the Mineralization and Cementing Properties of Microbiologically Induced Calcium Carbonate

Contaminated urban land: a situational analysis

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