Natural flocculants for the treatment of wastewaters containing dyes or heavy metals: A state-of-the-art review

2021 ◽  
pp. 106060
Author(s):  
Jamila El-Gaayda ◽  
Fatima Ezzahra Titchou ◽  
Rachid Oukhrib ◽  
Pow-Seng Yap ◽  
Tianqi Liu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
State Of The Art

scholarly journals Use of phytoremediation and biochar to remediate heavy metal polluted soils: a review

Solid Earth ◽  
2014 ◽  
Vol 5 (1) ◽  
pp. 65-75 ◽  
Author(s):  
J. Paz-Ferreiro ◽  
H. Lu ◽  
S. Fu ◽  
A. Méndez ◽  
G. Gascó
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Contaminated Soils ◽  
State Of The Art ◽  
Anthropogenic Activities ◽  
Sustainable Use ◽  
Research Needs ◽  
Polluted Soils ◽  
Environmental Technologies ◽  
The Cost

Abstract. Anthropogenic activities are resulting in an increase of the use and extraction of heavy metals. Heavy metals cannot be degraded and hence accumulate in the environment, having the potential to contaminate the food chain. This pollution threatens soil quality, plant survival and human health. The remediation of heavy metals deserves attention, but it is impaired by the cost of these processes. Phytoremediation and biochar are two sound environmental technologies which could be at the forefront to mitigate soil pollution. This review provides an overview of the state of the art of the scientific research on phytoremediation and biochar application to remediate heavy-metal-contaminated soils. Research to date has attempted only in a limited number of occasions to combine both techniques, however we discuss the potential advantages of combining both, and the potential mechanisms involved in the interaction between phytoremediators and biochar. We identified specific research needs to ensure a sustainable use of phytoremediation and biochar as remediation tools.

Pollution assessment of heavy metals in soils of India and ecological risk assessment: A state-of-the-art

Chemosphere ◽  
2019 ◽  
Vol 216 ◽  
pp. 449-462 ◽  
Author(s):  
Vinod Kumar ◽  
Anket Sharma ◽  
Parminder Kaur ◽  
Gagan Preet Singh Sidhu ◽  
Aditi Shreeya Bali ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Risk Assessment ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
State Of The Art ◽  
Pollution Assessment ◽  
Heavy Metals In Soils

scholarly journals Process Waters from Hydrothermal Carbonization of Sludge: Characteristics and Possible Valorization Pathways

2020 ◽  
Vol 17 (18) ◽  
pp. 6618
Author(s):  
Michela Langone ◽  
Daniele Basso
Keyword(s):  
Heavy Metals ◽  
State Of The Art ◽  
Value Added ◽  
Hydrothermal Carbonization ◽  
Process Water ◽  
Technical Feasibility ◽  
Toxic Compounds ◽  
Sludge Characteristics ◽  
Innovative Process ◽  
Feasibility Constraints

Hydrothermal carbonization (HTC) is an innovative process capable of converting wet biodegradable residues into value-added materials, such as hydrochar. HTC has been studied for decades, however, a lack of detailed information on the production and composition of the process water has been highlighted by several authors. In this paper the state of the art of the knowledge on this by-product is analyzed, with attention to HTC applied to municipal and agro-industrial anaerobic digestion digestate. The chemical and physical characteristics of the process water obtained at different HTC conditions are compared along with pH, color, organic matter, nutrients, heavy metals and toxic compounds. The possibility of recovering nutrients and other valorization pathways is analyzed and technical feasibility constraints are reported. Finally, the paper describes the main companies which are investing actively in proposing HTC technology towards improving an effective process water valorization.

State-of-the-art strategies for the colorimetric detection of heavy metals using gold nanorods based on aspect ratio reduction

2016 ◽  
Vol 8 (10) ◽  
pp. 2131-2137 ◽  
Author(s):  
Sruthi Ann Alex ◽  
N. Chandrasekaran ◽  
Amitava Mukherjee
Keyword(s):  
Heavy Metals ◽  
Aspect Ratio ◽  
Gold Nanorods ◽  
State Of The Art ◽  
Colorimetric Detection ◽  
Detection Techniques ◽  
Ratio Reduction

Current colorimetric detection techniques for metals using gold nanorods based on variations in the aspect ratio have been summarized.

scholarly journals Enterosorption in the Treatment of Heavy Metal Poisoning

2021 ◽  
Author(s):  
Sergey Mikhalovsky ◽  
Oleksandr Voytko ◽  
Violetta Demchenko ◽  
Pavlo Demchenko
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Chronic Exposure ◽  
State Of The Art ◽  
Cost Effective ◽  
Heavy Metal Poisoning ◽  
Industrial Activities ◽  
Current State ◽  
Metal Poisoning ◽  
The Impact

Enterosorption is a cost-effective and efficient approach to reducing the impact of chronic exposure to heavy metals and radionuclides. As an auxiliary method to medical treatment, it can protect population chronically exposed to the intake of heavy metals or radioactivity due to industrial activities or in the aftermath of technogenic or natural accidents. This paper assesses the current state of the art in the treatment of acute and chronic heavy metal poisoning.

scholarly journals Layer charge and heavy metals structures in hydrated 2 : 1 silicates: state of the art and new advances on cadmium

2009 ◽  
Vol 224 (5-6) ◽  
Author(s):  
Daniele Malferrari ◽  
Maria Franca Brigatti ◽  
Chiara Elmi ◽  
Angela Laurora ◽  
Giovanni Valdrè
Keyword(s):  
Heavy Metals ◽  
State Of The Art ◽  
Layer Charge

Stabilization of heavy metals loaded sewage sludge: Reviewing conventional to state-of-the-art thermal treatments in achieving energy sustainability

Chemosphere ◽  
2021 ◽  
pp. 130310
Author(s):  
Chin-Seng Liew ◽  
Worapon Kiatkittipong ◽  
Jun-Wei Lim ◽  
Man-Kee Lam ◽  
Yeek-Chia Ho ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
State Of The Art ◽  
Thermal Treatments ◽  
Energy Sustainability

Practical Picture Processing

1974 ◽  
Vol 32 ◽  
pp. 338-339
Author(s):  
T. A. Welton
Keyword(s):  
Radiation Damage ◽  
Coherence Length ◽  
Spatial Information ◽  
State Of The Art ◽  
Coherent Radiation ◽  
The State ◽  
Energy Spread ◽  
Electron Micrograph ◽  
Picture Processing ◽  
Molecular Skeleton

Various authors have emphasized the spatial information resident in an electron micrograph taken with adequately coherent radiation. In view of the completion of at least one such instrument, this opportunity is taken to summarize the state of the art of processing such micrographs. We use the usual symbols for the aberration coefficients, and supplement these with £ and 6 for the transverse coherence length and the fractional energy spread respectively. He also assume a weak, biologically interesting sample, with principal interest lying in the molecular skeleton remaining after obvious hydrogen loss and other radiation damage has occurred.

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