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Your search keyword '"Aly, Hassan"' showing total 5 results
Start Over Author "Aly, Hassan" Journal journal of environmental management
5 results on '"Aly, Hassan"'

4. Unprecedented biodesalination rates–Shortcomings of electrical conductivity measurements in determining salt removal by algae and cyanobacteria

Author

Ashraf Aly Hassan, Abdul Mannan Zafar, and Muhammad Asad Javed

Subjects
chemistry.chemical_classification, Cyanobacteria, Salinity, Environmental Engineering, biology, Brackish water, Chemistry, Ion chromatography, Electric Conductivity, Salt (chemistry), Sulfuric acid, General Medicine, Sodium Chloride, Management, Monitoring, Policy and Law, biology.organism_classification, Chloride, chemistry.chemical_compound, Chlorides, Environmental chemistry, medicine, Carbonate, Waste Management and Disposal, medicine.drug
Abstract

Phormidium keutzingianum performed biodesalination of brackish water (10 g/L). The electrical conductivity (EC) was measured to evaluate the salt concentration over 80 days of cyanobacterial inoculation. Anion concentrations were measured using ion chromatography to estimate salt removal. EC-based measurements showed ∼8–10% removal efficiency in the first 20 days. However, the removal efficiency based on chloride ion concentration showed ∼40% removal in the same time frame. The pH increase was observed with growth of algal biomass. The increasing pH proposes the formation of hydroxyl and carbonate ions. Sulfuric acid was added at day 110 to neutralize them. At pH 4, the EC reduced significantly to about ∼37% confirming the chloride removal. EC should not be used to measure salt reduction as it is an obscure parameter, and therefore, EC is not the best choice to measure salinity removal using algae. Some recently published studies used only EC to estimate biodesalination, and it is anticipated that salt removal is misrepresented in those studies.

Published
2022

5. Compliance with hand sanitizer quality during the SARS-CoV-2 pandemic: Assessing the impurities in an ethanol plant

Author

Nathan Kreutzer, Gabriel Cohen, Bruce I. Dvorak, Ashraf Aly Hassan, and Katie Mowat

Subjects
Process streams, Environmental Engineering, Hand Sanitizers, Alcohol, Hazardous air pollutants, Management, Monitoring, Policy and Law, Article, chemistry.chemical_compound, Hand sanitizer, Humans, Pandemics, Waste Management and Disposal, Total suspended solids, Pollutant, Ethanol, SARS-CoV-2, Chemical oxygen demand, Acetaldehyde, COVID-19, General Medicine, Pulp and paper industry, chemistry, Environmental science, Hand sanitizer production, Methanol, Impurities, Disinfectants
Abstract

Using alcohol-based disinfectants is an effective method for preventing the spread of COVID-19. However, non-traditional manufacturers of alcohol-based disinfectants, such as ethanol plants, need to undergo additional treatment to curb their impurities to limits set by the Food and Drug Association (FDA) to produce alcohol-based disinfectants. To transform them to disinfectant-grade alcohol, 17 process streams in a dry-mill ethanol plant were analyzed to determine the quality parameters for acetaldehyde, acetal, propanol, methanol, and water, including chemical oxygen demand, total suspended solids, and nutrients. Results suggest that the process stream generated by the distillation column requires further treatment because the acetaldehyde and acetal concentrations are significantly higher than the impurity limit set by the FDA. The addition of a second distillation column could be a potential method for addressing impurities and it will have minimal influence on hazardous air pollutant generation and water use., Graphical abstract Image 1

Published
2021

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