scholarly journals IN SITU AND EX SITU BIOREMEDIATION OF HEAVY METALS: THE PRESENT SCENARIO

2021 ◽  
Vol 29 (4) ◽  
pp. 454-469
Author(s):  
Oindrila Paul ◽  
Amrita Jasu ◽  
Dibyajit Lahiri ◽  
Moupriya Nag ◽  
Rina Rani Ray
Keyword(s):  
Heavy Metals ◽  
Gene Editing ◽  
Ex Situ ◽  
The Past ◽  
Effective Removal ◽  
Removal Of Heavy Metals ◽  
Recent Developments ◽  
Polluted Sites ◽  
Rapid Industrialization

Enhanced population growth, rapid industrialization, urbanization and hazardous industrial practices have resulted in the development of environmental pollution in the past few decades. Heavy metals are one of those pollutants that are related to environmental and public health concerns based on their toxicity. Effective bioremediation may be accomplished through “ex situ” and “in situ” processes, based on the type and concentration of pollutants, characteristics of the site but is not limited to cost. The recent developments in artificial neural network and microbial gene editing help to improve “in situ” bioremediation of heavy metals from the polluted sites. Multi-omics approaches are adopted for the effective removal of heavy metals by various indigenous microbes. This overview introspects two major bioremediation techniques, their principles, limitations and advantages, and the new aspects of nanobiotechnology, computational biology and DNA technology to improve the scenario.

scholarly journals Bioremediation Techniques for Soil Pollution: An Introduction

2021 ◽  
Author(s):  
Anita Verma
Keyword(s):  
Soil Pollution ◽  
Agricultural Practices ◽  
Polluted Soil ◽  
Ex Situ ◽  
Emerging Contaminant ◽  
Health Concerns ◽  
Site Characteristics ◽  
Polluted Sites ◽  
Rapid Industrialization

Environmental pollution has been on the rise in the past few decades owing to increased human activities on energy reservoirs, unsafe agricultural practices and rapid industrialization. Soil pollution is one of the major worry among all because soil contamination can harm the humans by consumption of food grown in polluted soil or it can cause infertility to soil and lower the productivity, Among the pollutants that are of environmental and public health concerns due to their toxicities are: heavy metals, nuclear wastes, pesticides, greenhouse gases, and hydrocarbons. So this chapter will include; Sources of soil pollution and remediation of polluted sites using biological means has proven effective and reliable due to its eco-friendly features. Bio-remediation can either be carried out ex situ or in situ, depending on several factors, which include site characteristics, type and concentration of pollutants. It also seen as a solution for emerging contaminant problems.

scholarly journals Assessment of sulfonated homo and co-polyimides incorporated polysulfone ultrafiltration blend membranes for effective removal of heavy metals and proteins

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Mohammad A. Jafar Mazumder ◽  
Panchami H. Raja ◽  
Arun M. Isloor ◽  
Muhammad Usman ◽  
Shakhawat H. Chowdhury ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Effective Removal ◽  
Blend Membranes ◽  
Removal Of Heavy Metals

Removal of Heavy Metals by Poly(Vinyl Pyrrolidone)/Laponite Nanocomposite Hydrogels

2013 ◽  
Vol 631-632 ◽  
pp. 291-297
Author(s):  
Yan Ming Wang ◽  
Da Ji Shang ◽  
Zhong Wei Niu
Keyword(s):  
Heavy Metals ◽  
Freeze Drying ◽  
In Situ Polymerization ◽  
Ion Concentration ◽  
Vinyl Pyrrolidone ◽  
Potential Candidate ◽  
Nanocomposite Hydrogels ◽  
Removal Of Heavy Metals ◽  
Poly Vinyl Pyrrolidone

Laponite cross-linked poly(vinyl pyrrolidone) (PVP) hydrogels were fabricated by in situ polymerization of vinyl pyrrolidone (NVP). Macroporous PVP/Laponite nanocomposite hydrogels were obtained by freeze drying of hydrogels, which exhibited faster adsorption kinetics than ambient-dried ones. We also investigated the influence of laponite content, initial ion concentration and pH of the solution on the adsorption capacity of PVP/Laponite hydrogels. Moreover, the PVP/Lapnoite hydrogels can further be fabricated into powder hydrogel samples, which can be used as a potential candidate of adsorbent for removal of heavy metals in water.

An“ex situ”microbial process for the removal of heavy metals from polluted soil: A case study of Ada rice field, Adani, Enugu State, Nigeria

2017 ◽  
Vol 21 (3-4) ◽  
pp. 128-137 ◽  
Author(s):  
Charles O. Nwuche ◽  
Oguejiofo T. Ujam ◽  
Janefrances N. Ihedioha ◽  
Charles C. Chime
Keyword(s):  
Heavy Metals ◽  
Rice Field ◽  
Polluted Soil ◽  
Ex Situ ◽  
Microbial Process ◽  
Removal Of Heavy Metals ◽  
Enugu State

scholarly journals Nanoadsorbants for the Removal of Heavy Metals from Contaminated Water: Current Scenario and Future Directions

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1379
Author(s):  
Rohit Kumar ◽  
Protima Rauwel ◽  
Erwan Rauwel
Keyword(s):  
Heavy Metals ◽  
Cost Effective ◽  
Water Current ◽  
Contaminated Water ◽  
Metallic Ions ◽  
Future Directions ◽  
The Past ◽  
Commercial Scale ◽  
Removal Of Heavy Metals ◽  
Current Scenario

Heavy metal pollution of aquatic media has grown significantly over the past few decades. Therefore, a number of physical, chemical, biological, and electrochemical technologies are being employed to tackle this problem. However, they possess various inescapable shortcomings curbing their utilization at a commercial scale. In this regard, nanotechnology has provided efficient and cost-effective solutions for the extraction of heavy metals from water. This review will provide a detailed overview on the efficiency and applicability of various adsorbents, i.e., carbon nanotubes, graphene, silica, zero-valent iron, and magnetic nanoparticles for scavenging metallic ions. These nanoparticles exhibit potential to be used in extracting a variety of toxic metals. Recently, nanomaterial-assisted bioelectrochemical removal of heavy metals has also emerged. To that end, various nanoparticle-based electrodes are being developed, offering more efficient, cost-effective, ecofriendly, and sustainable options. In addition, the promising perspectives of nanomaterials in environmental applications are also discussed in this paper and potential directions for future works are suggested.

scholarly journals Modern environmental technologies of healthy soils contaminated by heavy metals and radionuclides

2020 ◽  
Vol 166 ◽  
pp. 01007
Author(s):  
Vasyl Savosko ◽  
Aleksandr Podolyak ◽  
Irina Komarova ◽  
Aleksey Karpenko
Keyword(s):  
Heavy Metals ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Chemical Elements ◽  
Soil Layer ◽  
Ex Situ ◽  
Soil Restoration ◽  
Mission Strategy ◽  
Environmental Technologies

Object of research: to systematize (taking into account the possible consequences to biosphere) the known technologies for ecological restoration of soils contaminated by heavy metals and radionuclides. Only a healing technology should be recognized as one possible methodology for solving any soil problems. For soils contaminated by heavy metals and radionuclides healing patterns is conceptually ordered into the following levels: mission, strategy, technology. The mission of healthy soil should be aimed at maintaining the chemical elements content within the optimum interval. The strategy of healthy soil involves the regulation of individual elements content in the soil. Ex-situ a soil healing technology is implemented outside the original pollution site. In-situ, a soil healing technology is carried out directly on the original pollution site. Excavation of the contaminated soil layer is the first stage for ex-situ soil restoration. In the future it will be possible: 1) storage of contaminated soil at special landfills, 2) treatment of contaminated soil at a special reactor. All technologies for in-situ healthy of heavy metals contaminated soils can be ordered as: 1) localization, 2) deconcentration, 3) inactivation, 4) extraction.

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