scholarly journals Degradation of glyphosate in water by the application of surface-corona-discharges

2021 ◽  
Author(s):  
Katja Zocher ◽  
Peter Gros ◽  
Matthias Werneburg ◽  
Volker Brüser ◽  
Juergen F. Kolb ◽  
...  
Keyword(s):  
Waste Water ◽  
Energy Efficiency ◽  
Degradation Rate ◽  
Liquid Surface ◽  
Treatment Time ◽  
Ammonium Molybdate ◽  
Photometric Method ◽  
Corona Discharges ◽  
Physical Plasma ◽  
Biological Methods

Abstract Glyphosate (GLP) is one of the most widely applied herbicide, which is found ubiquitously in the environment. The removal of glyphosate from waste water and soil is challenging and can be achieved with chemical or biological methods, which, nevertheless, suffer from different disadvantages. The application of a physical plasma for the removal of GLP in water was examined by the application of surface corona discharges in a wire-to-cylinder setup filled with argon. The plasma was ignited at the liquid surface without any additives. By applying a photometric method, GLP was detected after derivatisation with fluorenyl methoxycarbonyl chloride, whereas phosphate was determined with ammonium molybdate. A GLP degradation rate of 90.8% could be achieved within a treatment time of 30 minutes with an estimated energy efficiency of 0.32 g/kWh.

Microwave Heating Effects on the Chemical Composition and the Antioxidant Capacity of Tataouine Virgin Olive Oils from Tunisia

2010 ◽  
Vol 73 (10) ◽  
pp. 1891-1901 ◽  
Author(s):  
IMEN OUESLATI ◽  
WAEL TAAMALLI ◽  
FAOUZIA M. HADDADA ◽  
MOKHTAR ZARROUK
Keyword(s):  
Oxidative Stability ◽  
Microwave Heating ◽  
Genetic Factor ◽  
Degradation Rate ◽  
Treatment Time ◽  
Antioxidant Potential ◽  
Virgin Olive Oils ◽  
Olive Oils ◽  
Heating Effects ◽  
Total Fraction

Four Tunisian virgin olive oils (VOOs), derived from varieties (Chemlali Tataouine, Zarrazi Douirat, Fakhari Douirat, and Dhokar Douirat) grown in the harsh pedoclimatic conditions of the region of Tataouine, were evaluated for their responses to microwave heating. Aside from fatty acid composition, all other evaluated parameters were affected by microwave heating, and their variations depend on the genetic factor. Chemlali Tataouine VOO exhibited the slowest biophenol degradation rate and the least diminution in oxidative stability and consequently, its total fraction and both lipidic and methanolic fractions remained unchanged with an exceptional antioxidant potential. In the remaining studied VOOs, the biophenol contents, the oxidative stability, and the antioxidant potential underwent gradual decreases; nevertheless, their levels at the longer treatment time are close to some fresh VOOs. These results should be taken into consideration when Tataouine VOOs are recommended for microwave heating.

Ethylene Glycol and Glycerin as the Solvent for Alkaline Treatment of Poly(ethylene Terephthalate) Fabrics

1997 ◽  
Vol 67 (10) ◽  
pp. 760-766 ◽  
Author(s):  
M.-C. Yang ◽  
H.-Y. Tsai
Keyword(s):  
Ethylene Glycol ◽  
Degradation Rate ◽  
Ethylene Terephthalate ◽  
Treatment Time ◽  
Alkaline Treatment ◽  
Aqueous System ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Kinetics Of ◽  
Scanning Electron

Poly(ethylene terephthalate) fabrics are treated with sodium hydroxide using ethylene glycol or glycerin as the solvent. Compared with conventional aqueous alkaline hydrolysis, the degradation rate in ethylene glycol increases tenfold. The kinetics of the alkaline-ethylene glycol treatment show that the weight loss is linear with respect to time. The moisture regain rate and tensile properties of the treated fabrics are measured; other tests include scanning electron microscopy and dyeing properties. The results show that the properties of the treated fabrics do not depend significantly on the solvent; therefore, using ethylene glycol can greatly shorten the treatment time to achieve results similar to those with the conventional aqueous system.

scholarly journals Acoustic Monitoring of the Dispersed Composition of Air Bubbles in Aeriated Waste Water Purification Processes

2021 ◽  
pp. 014-022
Author(s):  
S. A. Gavriliev ◽  
M. V. Ivanov
Keyword(s):  
Waste Water ◽  
Acoustic Method ◽  
Photometric Method ◽  
Experimental Plant ◽  
Air Bubbles ◽  
Flotation Column ◽  
Aeration System ◽  
Treatment Facilities ◽  
Passive Acoustic ◽  
Principal Possibility

A passive acoustic method is proposed for monitoring the dispersed composition of air bubbles, which determines the efficiency of wastewater treatment in facilities with aeration systems, in treatment facilities with aeration systems. The principal possibility of applying the method has been demonstrated on an experimental plant assembled on the basis of a flotation column. The size of the bubbles created by the flotation column aeration system was determined photometrically. It is shown that the error in determining the bubble radii by the proposed method relative to the photometric method was no more than 17.5%.

Green Nanomaterials for Photocatalytic Degradation of Toxic Organic Compounds

2021 ◽  
Vol 23 ◽  
Author(s):  
Saika Ahmed ◽  
Gulshan Ara ◽  
Md. Abu Bin Hasan Susan
Keyword(s):  
Waste Water ◽  
Organic Pollutants ◽  
Low Cost ◽  
Waste Water Treatment ◽  
Ecological Environment ◽  
Green Materials ◽  
End Products ◽  
Synthetic Routes ◽  
Chemical Wastes ◽  
Biological Methods

Abstract: In recent years, nanomaterials as photocatalysts have gained much popularity for the removal of organic pollutants from tainted water using photodegradation, since the available chemical, physical, and biological methods often are time consuming, involve high cost and dumping complications, sometimes posing serious threat to both human health and environmental elements. Use of nanomaterials is less expensive and does not, in general, form aggregated macromolecules. In addition, nanotechnology for waste-water treatment demolishes or alters the risky chemical wastes to harmless end products like H2O and CO2. Nanomaterials synthesized from natural resources or prepared using green synthetic routes are receiving surge of interest as our consciousness to ecological environment and safety rises. ‘Green’ materials of this kind might also show unique strength features and exceptional biodegradability, along with their other notable advantageous properties like minimum threat to environment, efficient recyclablity and low cost compared to synthetic nanomaterials. Such green nanomaterials can also serve as nanocatalysts to treat toxic organic pollutants in a safer way, including photodegradation to less or non-toxic products. This article reviews latest developments on the synthesis of some promising green nanomaterials aiming towards their efficient uses as photocatalysts for degradation of organic pollutants. Strategies to find new green materials as photocatalysts by modification of technologies, and development of novel methodologies for safer treatment of organic pollutants will also be discussed.

A data-driven methodology to support pump performance analysis and energy efficiency optimization in Waste Water Treatment Plants

2017 ◽  
Vol 208 ◽  
pp. 1430-1440 ◽  
Author(s):  
Dario Torregrossa ◽  
Joachim Hansen ◽  
Francesc Hernández-Sancho ◽  
Alex Cornelissen ◽  
Georges Schutz ◽  
...  
Keyword(s):  
Waste Water ◽  
Energy Efficiency ◽  
Water Treatment ◽  
Performance Analysis ◽  
Waste Water Treatment ◽  
Data Driven ◽  
Efficiency Optimization ◽  
Pump Performance ◽  
Water Treatment Plants ◽  
Waste Water Treatment Plants

Energy efficiency in waste water treatments plants: Optimization of activated sludge process coupled with anaerobic digestion

Energy ◽  
2012 ◽  
Vol 41 (1) ◽  
pp. 153-164 ◽  
Author(s):  
N. Descoins ◽  
S. Deleris ◽  
R. Lestienne ◽  
E. Trouvé ◽  
F. Maréchal
Keyword(s):  
Waste Water ◽  
Energy Efficiency ◽  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Activated Sludge Process ◽  
Water Treatments
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