Heterostructured TiO2@OC core@shell photocatalysts for highly efficient waste water treatment

2017 ◽  
Vol 41 (22) ◽  
pp. 13600-13610 ◽  
Author(s):  
Jennifer L. Bravo ◽  
Hermes Chirino ◽  
Yuanbing Mao
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Photocatalytic Degradation ◽  
Waste Water Treatment ◽  
Cost Effective ◽  
Organic Layer ◽  
Core Shell ◽  
Dye Molecules ◽  
Highly Efficient ◽  
Layer Coating

Facile, scalable and cost-effective organic layer coating of TiO2 particles greatly enhances the photocatalytic degradation of dye molecules.

A systematic approach to optimal upgrading of water and waste water treatment plants

1998 ◽  
Vol 37 (9) ◽  
pp. 9-16 ◽  
Author(s):  
Björn Rosén ◽  
Stig Morling
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Systematic Approach ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Cost Effective ◽  
Efficient Implementation ◽  
Local Conditions ◽  
Effective Implementation ◽  
Water Treatment Plants

Most of the future works in water and waste water treatment systems will involve the upgrading of existing facilities, for better performance and/or higher capacity. For the efficient implementation of any project, an upgrading strategy should be used, based on careful studies of the local conditions and the defined objectives to be reached. The paper presents a systematic approach to upgrading with emphasis on treatment plant extension, without investing in large volumes, by more efficient use of existing facilities, illustrated by some cases. The importance of real competition in obtaining a cost-effective implementation is stressed.

A cost-effective, stable, magnetically recyclable photocatalyst of ultra-high organic pollutant degradation efficiency: SnFe2O4 nanocrystals from a carrier solvent assisted interfacial reaction process

2015 ◽  
Vol 3 (23) ◽  
pp. 12259-12267 ◽  
Author(s):  
Kuan-Ting Lee ◽  
Shih-Yuan Lu
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Organic Pollutants ◽  
Organic Pollutant ◽  
Waste Water Treatment ◽  
Cost Effective ◽  
Pollutant Degradation ◽  
Organic Pollutant Degradation ◽  
Recyclable Photocatalyst ◽  
Carrier Solvent

SnFe2O4 nanocrystals, which are cost-effective, stable, and magnetically recyclable, exhibit ultra-high degradation efficiencies toward recalcitrant organic pollutants and are proven to be an extraordinary photocatalyst for Fenton-like processes for waste water treatment.

Microplastics in a UK Landfill: Developing Methods and Assessing Concentrations in Leachate, Hydrogeology, and Release to the Environment

2020 ◽  
Author(s):  
Max Waddell ◽  
Nathalie Grassineau ◽  
James Brakeley ◽  
Kevin Clemitshaw
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Surface Water ◽  
Water Discharge ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Cost Effective ◽  
Average Concentration ◽  
Leachate Treatment ◽  
Living Organisms

<p>Inadequate management of plastic waste has resulted in its ubiquity within the environment, and presents a risk to living organisms. Harm caused by large plastics is well documented, but progressive understanding of microplastics (< 5mm) reveals an ever more unsettling issue. Microplastics contamination is considered an emerging global multidisciplinary issue that would be aided by further research on sources, distribution, abundance, and transport mechanisms. Landfills are a suspected source of such, but research at these sites is insufficient. Although the risks surrounding microplastics are still inconclusive, there is concern over their accumulation in organisms, leaching constituents, and hydrophobic nature. Studying microplastics in the environment, let alone landfill, is challenging as standard and accepted methodologies are presently non-existent.</p><p>Here, microplastics (1mm to 25µm) were evaluated at one particular and long-running UK landfill after first developing a simple, replicable, efficient, and cost effective sampling and analysis approach. Concentrations and types of microplastics were quantified in raw leachate, treated leachate, waste water, groundwater, and surface water, to characterise abundance, distribution, and released loads to the environment. Samples were filtered in-situ, with subsequent purification at the laboratory by Fenton’s reagent. Analysis relied heavily on microscopic sorting and counting, but use of Scanning Electron Microscopy – Energy Dispersive X-Ray Spectroscopy enabled instrumental interrogation of particles suspected to be plastic. Many factors investigated here appear novel to the literature, and comprehensively explore: temporal variation of microplastics in raw leachate across different landfill phases and waste ages; their abundance in local groundwater, and surface water discharge; microplastics distribution within a leachate treatment plant; and their subsequent release to the environment from a waste water treatment facility. The results build upon the small collection of existing work, but also offer new insights into microplastics’ occurrence in, around, and released from a landfill site.</p><p>In total, 62 samples were taken, and particles considered microplastics (MP) were most abundant in groundwater, followed by raw leachate > waste water > treated leachate > surface water. Average concentration in groundwater was 105.1±104.3 MP L<sup>-1</sup>, raw leachate 3.3±1.7 MP L<sup>-1</sup>, and waste water was 1.8±0.73 MP L<sup>-1</sup>. Consistent with other research, fibres were most dominant, but blank samples highlight the great potential for secondary contamination. Imaging of suspect particles revealed the extreme nature and conditions of landfill sites in their generation of microplastics. Analogous to waste water treatment, leachate treatment is shown to be reducing microplastics in the discharge by 58.1%, and it is expected that microplastics are retained in the treatment plant sludge. Daily loads from leachate treatment were 142,558±67,744 MP day<sup>-1</sup>, but from waste water this was approximately 45.2±18.3 million MP day<sup>-1</sup>. Ultimately, the landfill is not a final sink of microplastics but a source, for those >25 µm, to the environment: yet, it is unlikely to be a significant one. Results highlighted the need for reduction strategies at waste water treatment plants and in the site’s groundwater boreholes, as well as further investigation to determine the source of abundant fibres in the surface water.</p>

Synchronous role of coupled adsorption and photocatalytic oxidation on the hybrid nanomaterials of pectin and nickel ferrite leads to the excellent removal of toxic dye effluents

2020 ◽  
Vol 44 (43) ◽  
pp. 18879-18891
Author(s):  
Kanu Gupta ◽  
Komal ◽  
Nidhi ◽  
K. B. Tikoo ◽  
Vinod Kumar ◽  
...  
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Nickel Ferrite ◽  
Photocatalytic Oxidation ◽  
Waste Water Treatment ◽  
Dye Molecules ◽  
Hybrid Nanomaterials

Ecofriendly and robust hybrid nanomaterials of pectin and nickel ferrite were succesfully employed for the adsorptive degradation of toxic dye molecules in waste water treatment.

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