scholarly journals The Research of Nanoparticle and Microparticle Hydroxyapatite Amendment in Multiple Heavy Metals Contaminated Soil Remediation

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Zhangwei Li ◽  
Man-man Zhou ◽  
Weidian Lin
Keyword(s):  
Particle Size ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Particle Sizes ◽  
Micrometer Particle ◽  
Metal Immobilization ◽  
Sequential Extraction Method ◽  
Multiple Heavy Metals ◽  
Nanometer Particle

It was believed that when hydroxyapatite (HAP) was used to remediate heavy metal-contaminated soils, its effectiveness seemed likely to be affected by its particle size. In this study, a pot trial was conducted to evaluate the efficiency of two particle sizes of HAP: nanometer particle size of HAP (nHAP) and micrometer particle size of HAP (mHAP) induced metal immobilization in soils. Both mHAP and nHAP were assessed for their ability to reduce lead (Pb), zinc (Zn), copper (Cu), and chromium (Cr) bioavailability in an artificially metal-contaminated soil. The pakchoi (Brassica chinensisL.) uptake and soil sequential extraction method were used to determine the immobilization and bioavailability of Pb, Zn, Cu, and Cr. The results indicated that both mHAP and nHAP had significant effect on reducing the uptake of Pb, Zn, Cu, and Cr by pakchoi. Furthermore, both mHAP and nHAP were efficient in covering Pb, Zn, Cu, and Cr from nonresidual into residual forms. However, mHAP was superior to nHAP in immobilization of Pb, Zn, Cu, and Cr in metal-contaminated soil and reducing the Pb, Zn, Cu, and Cr utilized by pakchoi. The results suggested that mHAP had the better effect on remediation multiple metal-contaminated soils than nHAP and was more suitable for applying inin situremediation technology.

scholarly journals Bioavailability and leaching of Cd and Pb from contaminated soil amended with different sizes of biochar

2018 ◽  
Vol 5 (11) ◽  
pp. 181328 ◽  
Author(s):  
Alaa Hasan Fahmi ◽  
Abd Wahid Samsuri ◽  
Hamdan Jol ◽  
Daljit Singh
Keyword(s):  
Heavy Metals ◽  
Particle Size ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Cation Exchange Capacity ◽  
Application Rate ◽  
Exchange Capacity ◽  
Particle Sizes ◽  
Empty Fruit Bunch ◽  
Treated Soil

Biochars have been successfully used to reduce bioavailability and leaching of heavy metals in contaminated soils. The efficiency of biochar to immobilize heavy metals can be increased by reducing the particle size, which can increase the surface area and the cation exchange capacity (CEC). In this study, the empty fruit bunch biochar (EFBB) of oil palm was separated into two particle sizes, namely, fine (F-EFBB < 50 µm) and coarse (C-EFBB > 2 mm), to treat the contaminated soil with Cd and Pb. Results revealed that the addition of C-EFBB and F-EFBB increased the pH, electrical conductivity and CEC of the contaminated soil. The amounts of synthetic rainwater extractable and leachable Cd and Pb significantly decreased with the EFBB application. The lowest extractable and leachable Cd and Pb were observed from 1% F-EFBB-treated soil. The amount of extractable and leachable Cd and Pb decreased with increasing incubation times and leaching cycles. The application of F-EFBB to Cd and Pb-contaminated soil can immobilize the heavy metals more than that of C-EFBB. Therefore, the EFBB can be recommended for the remediation of heavy metal-contaminated soils, and a finer particle size can be applied at a lower application rate than the coarser biochar to achieve these goals.

scholarly journals Effect of Particle Size on the HDS Activity of Molybdenum Sulfide

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Carola Contreras ◽  
Fernanda Isquierdo ◽  
Pedro Pereira-Almao ◽  
Carlos E. Scott
Keyword(s):  
Particle Size ◽  
Heavy Oil ◽  
Molybdenum Sulfide ◽  
Vacuum Gas Oil ◽  
Particle Sizes ◽  
Heavy Oils ◽  
Gas Oil ◽  
Oil Reserves ◽  
Effect Of Particle Size

More than half of the total world oil reserves are heavy oil, extra heavy oil, and bitumen; however their catalytic conversion to more valuable products is challenging. The use of submicronic particles or nanoparticles of catalysts suspended in the feedstock may be a viable alternative to the conversion of heavy oils at refinery level or downhole (in situ upgrading). In the present work, molybdenum sulfide (MoS2) particles with varying diameters (10000–10 nm) were prepared using polyvinylpyrrolidone as capping agent. The prepared particles were characterized by DLS, TEM, XRD, and XPS and tested in the hydrodesulfurization (HDS) of a vacuum gas oil (VGO). A correlation between particle size and activity is presented. It was found that particles with diameters around 13 nm show double the HDS activity compared with the material with micrometric particle sizes (diameter ≈ 10,000 nm).

scholarly journals Bio Remedial Potential for the Treatment of Contaminated Soils

2021 ◽  
Vol 2 (4) ◽  
pp. 53-58
Author(s):  
Hasnain Raza ◽  
Keyword(s):  
Heavy Metal ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Anthropogenic Activities ◽  
Cost Effective ◽  
Polluted Soil ◽  
Soil Bioremediation ◽  
Environmental Threat ◽  
The World

As anthropogenic activities rise over the world, representing an environmental threat, soil contamination and treatment of polluted areas have become a worldwide concern. Bioremediation is a sustainable technique that could be a cost-effective mitigating solution for heavy metal-polluted soil regeneration. Due to the difficulties in determining the optimum bioremediation methodology for each type of pollutant and the lack of literature on soil bioremediation, we reviewed the main in-situ type, their current properties, applications, and techniques, plants, and microbe’s efficiency for treatment of contaminated soil. In this review, we describe the deeper knowledge of the in-situ types of bioremediation and their different pollutant accumulation mechanisms.

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.

An Experimental Study on the Effects of Abrasive Particle Sizes on Polishing Phenomena

2006 ◽  
Vol 505-507 ◽  
pp. 301-306
Author(s):  
Yeau Ren Jeng ◽  
Pay Yau Huang
Keyword(s):  
Experimental Study ◽  
Particle Size ◽  
Theoretical Model ◽  
Test Bench ◽  
Abrasive Particle ◽  
Theoretical Data ◽  
Measurement Technology ◽  
Particle Sizes ◽  
Polishing Process

The effects of abrasive particle size on polishing phenomena during wafer planarization are investigated using a high precision polishing process test bench with in-situ measurement technology. The present experimental results are found to be comported with the experimental and theoretical data published previously. The current experimental outcomes can help to understand the polishing mechanism and develop the relating theoretical model.

Multivariate data analysis for bioremediation of contaminated soil through Interactions between heavy metals, microbes and plants

2013 ◽  
Vol 1 (1) ◽  
pp. 21-28
Author(s):  
Basel Natsheh ◽  
Nawaf Abu-Khalaf ◽  
Tahseen Sayara ◽  
Saed Khayat ◽  
Mazen Salman
Keyword(s):  
Contaminated Soil ◽  
Contaminated Soils ◽  
Sewage Effluent ◽  
In Situ Remediation ◽  
Promising Technique ◽  
Plant Parts ◽  
Complex Interactions ◽  
Fungal Inoculation ◽  
Soil Metal

Plant-assisted bioremediation (phytoremediation) is a promising technique for in-situ remediation of contaminated soils. Enhancement of phytoremediation processes requires a sound understanding of the complex interactions in the rhizosphere. This work presents a Pot experiment was conducted under green house conditions to test the effect of fungal inoculation on remediating heavy metal (HM) contaminated soil treated with sewage effluent for several years. Canola crop was used as accumulator plants. Results demonstrated that the dry matter yield of tested crops were significantly higher in soil irrigated for 50 years with sewage effluent than that in 20 years sewage effluent irrigated soil. Metal uptake and accumulation in different plant parts (shoot and root) was enhanced after inoculation with Aspergillus parasiticus (F1) and Fusarium oxysporum (F2). The reate of HM accumulation as higher in in soil treated irrigated sewage effluent for 50 years than that in 20 years sewage irrigated soil.

Multivariate data analysis for bioremediation of contaminated soil through Interactions between heavy metals, microbes and plants

2013 ◽  
Vol 1 (1) ◽  
pp. 21-28
Author(s):  
Basel Natsheh ◽  
Nawaf Abu-Khalaf ◽  
Tahseen Sayara ◽  
Saed Khayat ◽  
Mazen Salman
Keyword(s):  
Contaminated Soil ◽  
Contaminated Soils ◽  
Sewage Effluent ◽  
In Situ Remediation ◽  
Promising Technique ◽  
Plant Parts ◽  
Complex Interactions ◽  
Fungal Inoculation ◽  
Soil Metal

Plant-assisted bioremediation (phytoremediation) is a promising technique for in-situ remediation of contaminated soils. Enhancement of phytoremediation processes requires a sound understanding of the complex interactions in the rhizosphere. This work presents a Pot experiment was conducted under green house conditions to test the effect of fungal inoculation on remediating heavy metal (HM) contaminated soil treated with sewage effluent for several years. Canola crop was used as accumulator plants. Results demonstrated that the dry matter yield of tested crops were significantly higher in soil irrigated for 50 years with sewage effluent than that in 20 years sewage effluent irrigated soil. Metal uptake and accumulation in different plant parts (shoot and root) was enhanced after inoculation with Aspergillus parasiticus (F1) and Fusarium oxysporum (F2). The reate of HM accumulation as higher in in soil treated irrigated sewage effluent for 50 years than that in 20 years sewage irrigated soil.

Comparative Environmental and Economic Analysis of Methods for the Remediation of Oil-Contaminated Soils by in situ Bioremediation and Mechanical Soil Replacement

2018 ◽  
Vol 22 (11) ◽  
pp. 40-45 ◽  
Author(s):  
A.V. Slusarevsky ◽  
L.V. Zinnatshina ◽  
G.K. Vasilyeva
Keyword(s):  
Economic Analysis ◽  
Hazardous Waste ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Soil Cover ◽  
In Situ Bioremediation ◽  
Growing Seasons ◽  
The Cost

It is shown that the mechanical remediation of oil-contaminated soil is carried out quickly and radically, and the cost of this method (from 3.8 to 62.4 million rubles/ha) is several times higher than the cost of bioremediation. Soil cleaning by in situ bioremediation can last from 1 to 3 growing seasons, but it does not require the transportation and disposal of hazardous waste and does not destroy the soil cover. Adding sorbents and ameliorants for bioremediation of oil-contaminated soils is often justified, since it significantly expands the capabilities of the method, although it increases the cost of cleaning from 1.0–4.3 to 1.1–18.3 million rubles/ha, depending on the type and dose sorbent.

scholarly journals In situ phytoremediation of copper and cadmium in a co-contaminated soil and its biological and physical effects

RSC Advances ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 993-1003 ◽  
Author(s):  
Lei Xu ◽  
Xiangyu Xing ◽  
Jiani Liang ◽  
Jianbiao Peng ◽  
Jing Zhou
Keyword(s):  
Heavy Metal ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Cost Effective ◽  
Potential Cost ◽  
Effective Technology ◽  
Physical Effects

Phytoremediation is a potential cost-effective technology for remediating heavy metal-contaminated soils.

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