scholarly journals Environmental Impact Assessment of Nanofluids Containing Mixtures of Surfactants And Silica Nanoparticles

2021 ◽  
Author(s):  
Manuela Lechuga ◽  
Mercedes Fernandez-Serrano ◽  
Francisco Ríos ◽  
Alejandro Fernández-Arteaga ◽  
Ramón Jiménez-Robles
Keyword(s):  
Environmental Impact ◽  
Silica Nanoparticles ◽  
Anionic Surfactants ◽  
Adsorption Properties ◽  
Ionic Surfactant ◽  
Treatment Processes ◽  
Mixtures Of Surfactants ◽  
Biodegradation Process ◽  
The Individual ◽  
Aerobic Biodegradability

Abstract Due to the widespread use of nanoparticles in surfactant-based formulations, their release into the environment and wastewater is unavoidable, causing a toxic effect to biota and/or wastewater treatment processes. Because of concerns about the environmental impact of nanofluids, the study of the fate and environmental impact, hazards and toxicity of nanoparticles is beginning. However, the interactions between nanoparticles and surfactants as well as the biodegradability in mixtures have been little studied until now. In this work the environmental impact of nanofluids containing mixtures of surfactants and silica nanoparticles were evaluated. The systems studied were hydrophilic silica nanoparticles (size 7 and 12 nm), a non-ionic surfactant (alkyl polyglucoside), an anionic surfactant (ether carboxylic acid), and mixtures of them. The aerobic ultimate biodegradation and interfacial and adsorption properties of surfactants, nanoparticles and mixtures during the biodegradation process were also evaluated. Aerobic biodegradability was determined by measurements of dissolved organic carbon for solutions with variable concentrations of surfactants and nanoparticles. The ultimate biodegradation was studied below and above the CMC of the individual surfactants. Interfacial and adsorption properties of surfactants solutions containing nanoparticles are influenced by the addition of silica particles. It was determined that silica nanoparticles reduced the capability of non-ionic surfactants to decrease the surface tension. Thus, silica NP promoted a considerable increase of their CMC, whereas the effect was the opposite in case of anionic surfactants. The increasing concentration of surfactant and nanoparticles in the test medium causes a decrease in the maximum levels of mineralization reached for both types of surfactants. The presence of silica nanoparticles in the medium reduces the biodegradability of binary mixtures non-ionic-anionic- surfactants solutions, being this effect more intense for larger nanoparticles. These results could be taken into account to model the behavior of nanofluids in aquatic environments and to select appropriate nanofluids containing nanoparticles and surfactants with low environmental impact.

scholarly journals Analysis of the impact of plastic on the theme of Environmental Education for application in Brazilian public schools

2020 ◽  
Vol 8 (6) ◽  
pp. 78-89
Author(s):  
Diovana Napoleão ◽  
Letícia Alvarenga de Paula Eduardo ◽  
Roberta Veloso Garcia ◽  
Estaner Claro Romão
Keyword(s):  
Public Schools ◽  
Environmental Impact ◽  
Environmental Education ◽  
Waste Management ◽  
Social Values ◽  
Environmental Issues ◽  
Aquatic Environments ◽  
Pedagogical Practice ◽  
The Individual ◽  
The Impact

Environmental issues have been a prominent issue worldwide and the increase in plastic production and the lack of post-consumer waste management programs result in inadequate disposal and deposition in terrestrial and aquatic environments, causing environmental impacts. This paper was developed through the analysis of aspects of pedagogical practice in relation to environmental education with the plastic theme and its environmental impact on the environment. In this perspective, environmental education through the individual and the collectivity builds social values, knowledge, skills and competences aimed at the conservation of the environment. However, it was observed that addressing environmental issues should be considered a challenge for teachers, as it is a broad and diverse subject, as they are not prepared for the development of these activities and schools do not have the infrastructure to meet the needs of approaches to environmental issues.

Paint Waste Management in Industry

2020 ◽  
Vol 20 (1) ◽  
pp. 28-33
Author(s):  
Ainul Haezah Noruzman ◽  
Nazirah Mohd Apandi
Keyword(s):  
Sustainable Development ◽  
Environmental Impact ◽  
Waste Management ◽  
Large Volume ◽  
Surface Coating ◽  
Rapid Development ◽  
Treatment Processes ◽  
The World ◽  
Paint Industry ◽  
Negative Environmental Impact

Surface coating, paint and allied products industry is one of the major productions in the world due to the increase of urbanization and rapid development. Paint industry offers a variety of colours and types of paint to serve as needed. However, global production of paint consumption may lead to large volume of waste generated which affects people’s health and creating environmental surroundings such as landfill area, stormwater drainage and natural waterways. Therefore, this paper highlights the application of paint generally in terms of productions, treatment processes and waste management, as well as finding out the necessary steps to be taken to minimise wastes caused by productions. Furthermore, the understanding of these wastes may contribute to reduce the negative environmental impact and provide sustainable development by utilizing and promoting the paint waste as building material.

The influence of negatively charged silica nanoparticles on the surface properties of anionic surfactants: electrostatic repulsion or the effect of ionic strength?

2020 ◽  
Vol 22 (4) ◽  
pp. 2238-2248 ◽  
Author(s):  
Milad Eftekhari ◽  
Karin Schwarzenberger ◽  
Aliyar Javadi ◽  
Kerstin Eckert
Keyword(s):  
Ionic Strength ◽  
Silica Nanoparticles ◽  
Surface Properties ◽  
Surface Activity ◽  
Aqueous Phase ◽  
Anionic Surfactants ◽  
Electrostatic Repulsion ◽  
Charged Nanoparticles

The presence of negatively charged nanoparticles affects the surface activity of anionic surfactants in an aqueous phase. This effect is mainly caused by the change in ionic strength of the system resulted from the addition of nanoparticles.

Evaluation of the Federal German Act on Environmental Impact Assessment (EIA Act)

elni Review ◽  
2008 ◽  
pp. 70-77
Author(s):  
Kilian Bizer ◽  
Jaqui Dopfer ◽  
Martin Führ
Keyword(s):  
Environmental Impact ◽  
Impact Assessment ◽  
Environmental Impact Assessment ◽  
Analytical Approach ◽  
Policy Options ◽  
Research Project ◽  
The Individual

The aim of this article is to provide a short synopsis of the results of the research project on “Evaluation of the Federal German EIA Act”. First of all, the analytical approach is elucidated, followed by the results of the individual stages of Environmental Impact Assessment and the general findings across all stages. Finally, recommendations are provided on the different policy options.

Selective and sensitive chromo-fluorogenic sensing of anionic surfactants in water using functionalised silica nanoparticles

2011 ◽  
Vol 47 (24) ◽  
pp. 6873 ◽  
Author(s):  
Estela Climent ◽  
Cristina Giménez ◽  
Ma Dolores Marcos ◽  
Ramón Martínez-Máñez ◽  
Félix Sancenón ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Anionic Surfactants

scholarly journals ENVIRONMENTAL IMPACT OF WATER TREATMENT PROCESS. A SYSTEMATIC REVIEW OF EVALUATION METHOD

2016 ◽  
Vol 22 (3) ◽  
pp. 34-39
Author(s):  
FLORINA FABIAN ◽  
VALENTIN NEDEFF ◽  
MIRELA PANAINTE -LEHADUS ◽  
OANA IRIMIA ◽  
SILVIA RACOVITA
Keyword(s):  
Systematic Review ◽  
Global Warming ◽  
Water Treatment ◽  
Environmental Impact ◽  
Carbon Footprint ◽  
Treatment Process ◽  
Environmental Indicators ◽  
Impact Categories ◽  
Water Treatment Process ◽  
Treatment Processes

In an international context in continuous development, water treatment processes become an important component of society where we live. Attention is directed on water treatment processes in the context of increasing water demand. This study proposes a systematic review of methods for the assessment of the environmental impact of Water Treatment process. The approach is based on the evaluation of LCA, Externalities Evaluation methodology and Carbon Footprint methodology, each of these methods have the environmental indicators able to relate direct and indirect emissions generated by any water treatment process. The present review compares and discusses the implementation of the above-cited methodologies to different case studies. The results in short show that Carbon Footprint only assesses the global warming potential of a water treatment plant, whereas Life Cycle Analysis and assess multiple environmental impact categories, which may include global warming, but also impacts on human health, ecosystems quality, etc. There are different standards and organizations around each assessment. The ExternE method on the contrary aims to quantify external impacts, from both economic and social points of view, to weight each endpoint of the impact categories.

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