scholarly journals A proposed index to assess quality of waters from desalination plants

2018 ◽  
Vol 22 (10) ◽  
pp. 667-672 ◽  
Author(s):  
Francisco P. de S. Antas ◽  
Jair J. R. de Freitas ◽  
André M. de Oliveira ◽  
Nildo da S. Dias ◽  
Alexandre de O. Lima ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Soil Salinization ◽  
Monitoring Networks ◽  
Relative Index ◽  
Critical Areas ◽  
Quality Of Waters ◽  
Water Vulnerability ◽  
Assess Quality ◽  
Desalination Plants

ABSTRACT Reverse osmosis is the technology commonly used to produce fresh water from brackish groundwater. Due to the reject brine generated in desalination plants by reverse osmosis, vulnerability assessment to define critical areas to monitor waters from desalination has been an important tool for delineating the monitoring networks required for surveillance of potential salinization sites. The objective of this study was to assess the quality of waters sampled in desalination plants by a quality index, which provides a relative assessment of water vulnerability to potential salinization. The present study proposes an index to assess the quality of waters from desalination plants initially using the chemical parameters electrical conductivity, sodium adsorption ratio, Mg2+/Ca2+ ratio, and the ions sodium, chloride and bicarbonate. The index to assess quality of waters from desalination plants showed good performance and can include additional parameters referring to the soil and crop exploited. High values of the relative index of quality of waters from desalination plants are considered as possible indicators of risk of soil salinization and groundwater contamination. The highest level of land use impact on the quality of waters from desalination plants was found in reject brine samples followed by well water samples.

scholarly journals Electrospun Nanostructured Membrane Engineering Using Reverse Osmosis Recycled Modules: Membrane Distillation Application

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1601
Author(s):  
Jorge Contreras-Martínez ◽  
Carmen García-Payo ◽  
Mohamed Khayet
Keyword(s):  
Reverse Osmosis ◽  
Polyvinylidene Fluoride ◽  
Membrane Distillation ◽  
Permeate Flux ◽  
Electrospinning Technique ◽  
Salt Rejection ◽  
Rejection Factor ◽  
Nanofibrous Membranes ◽  
Membrane Engineering ◽  
Desalination Plants

As a consequence of the increase in reverse osmosis (RO) desalination plants, the number of discarded RO modules for 2020 was estimated to be 14.8 million annually. Currently, these discarded modules are disposed of in nearby landfills generating high volumes of waste. In order to extend their useful life, in this research study, we propose recycling and reusing the internal components of the discarded RO modules, membranes and spacers, in membrane engineering for membrane distillation (MD) technology. After passive cleaning with a sodium hypochlorite aqueous solution, these recycled components were reused as support for polyvinylidene fluoride nanofibrous membranes prepared by electrospinning technique. The prepared membranes were characterized by different techniques and, finally, tested in desalination of high saline solutions (brines) by direct contact membrane distillation (DCMD). The effect of the electrospinning time, which is the same as the thickness of the nanofibrous layer, was studied in order to optimize the permeate flux together with the salt rejection factor and to obtain robust membranes with stable DCMD desalination performance. When the recycled RO membrane or the permeate spacer were used as supports with 60 min electrospinning time, good permeate fluxes were achieved, 43.2 and 18.1 kg m−2 h−1, respectively; with very high salt rejection factors, greater than 99.99%. These results are reasonably competitive compared to other supported and unsupported MD nanofibrous membranes. In contrast, when using the feed spacer as support, inhomogeneous structures were observed on the electrospun nanofibrous layer due to the special characteristics of this spacer resulting in low salt rejection factors and mechanical properties of the electrospun nanofibrous membrane.

scholarly journals Quality of Life and Associated Factors in Young Workers

2021 ◽  
Vol 18 (4) ◽  
pp. 2153
Author(s):  
José Andrade Louzado ◽  
Matheus Lopes Cortes ◽  
Márcio Galvão Oliveira ◽  
Vanessa Moraes Bezerra ◽  
Sóstenes Mistro ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Odds Ratio ◽  
Cross Sectional Study ◽  
Young Workers ◽  
Cross Sectional ◽  
Physically Active ◽  
Significance Level ◽  
Self Rated Health ◽  
Assess Quality

Background: This study aimed to identify the factors associated with the quality of life of young workers of a Social Work of Industry Unit. Methods: This was a cross-sectional study conducted on 1270 workers. Data were collected using a digital questionnaire built on the KoBoToolbox platform that included the EUROHIS-QOL eight-item index to assess quality of life. Demographic, socioeconomic, behavioral, and clinical variables were considered explanatory. The associations were analyzed using the ordinal logistic regression model at a 5% significance level. Results: Men and women had a mean quality of life of 31.1 and 29.4, respectively. Workers that rated their health as “very good” had an odds ratio of 7.4 (95% confidence interval (CI) = 5.17–10.81), and those who rated it as “good” had an odds ratio of 2.9 (95% CI = 2.31–3.77). Both these groups of workers were more likely to have higher levels of quality of life as compared to workers with “regular”, “poor”, or “very poor” self-rated health. Physically active individuals were 30% more likely to have higher levels of quality of life (odds ratio = 1.3; 95% CI = 1.08–1.65). After adjusting the model by gender, age group, marital status, socioeconomic class, self-rated health, nutritional status, and risky alcohol consumption, the odds ratio of active individuals remained stable (odds ratio = 1.3; 95% CI = 1.05–1.66). Conclusions: In the present study, self-rated health, physical activity, and gender were associated with young workers’ quality of life.

An optimization framework for the design of reverse osmosis desalination plants under food-energy-water nexus considerations

Desalination ◽  
2021 ◽  
Vol 503 ◽  
pp. 114937
Author(s):  
Marcello Di Martino ◽  
Styliani Avraamidou ◽  
Julie Cook ◽  
Efstratios N. Pistikopoulos
Keyword(s):  
Reverse Osmosis ◽  
Food Energy ◽  
Optimization Framework ◽  
Desalination Plants ◽  
Reverse Osmosis Desalination

Statistical sampling design impact on predictive quality of harmonization functions between soil monitoring networks

Geoderma ◽  
2014 ◽  
Vol 213 ◽  
pp. 133-143 ◽  
Author(s):  
B.P. Louis ◽  
N.P.A. Saby ◽  
T.G. Orton ◽  
E. Lacarce ◽  
L. Boulonne ◽  
...  
Keyword(s):  
Sampling Design ◽  
Statistical Sampling ◽  
Monitoring Networks ◽  
Soil Monitoring ◽  
Predictive Quality
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