Volume 7, Issue 5 (2-2012)
J Health Syst Res 2012, 7(5): 0-0 |
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Mehdinejad M H, Shahmansouri M R, Bina B. Separation of Anionic Surfactants from Surface Waters by Dissolved Air Floatation (DAF) Method. J Health Syst Res 2012; 7 (5)
URL: http://hsr.mui.ac.ir/article-1-271-en.html
URL: http://hsr.mui.ac.ir/article-1-271-en.html
1- Assistant Professor, Environmental Health Research Center, Department of Environmental Health Engineering, School of Public Health, University of Golestan, Gorgan, Iran.
2- Associate Professor, Department of Environmental Health Engineering, School of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran
3- Professor, Department of Environmental Health Engineering, School of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran.
2- Associate Professor, Department of Environmental Health Engineering, School of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran
3- Professor, Department of Environmental Health Engineering, School of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran.
Abstract: (1225 Views)
Background: Development of industries, population growth, and improved health level have caused wide usage of detergents. These materials are discharged into surface waters through domestic wastewater and make environmental risks. The aim of this study was to separate anionic surfactants from surface waters by dissolved air flotation (DAF) method. Methods: A DAF pilot unit was constructed with continuous flow including coagulation, flocculation, and flotation basins. The calibration curves were made with standard concentrations of anionic surfactants. Raw water was mixed with anionic surfactants and the experiments were performed in saturation pressures between 3-5 atm, coagulant dosages from 5 to 15 mg/l, and flotation times from 19.3 min to 26 min. Findings: During the experiments, pH of the water was 8-8.2 and the raw water turbidity varied normally from 7.4 to 144 NTU. The optimum dosage of coagulant was found as 15 mg/l. The maximum efficacy of linear alkylbenzene sulphonate (LAS) removal in the flotation time of 26 min and 19.3 min was between 91% and 41.1%. Statistical analysis showed a positive correlation between LAS removal and turbidity. Conclusion: In this process, the performance of dissolved air flotation was affected by pressurized recycle water or saturation pressure, flotation time, and the concentration of coagulant. Removal of surfactants was obtained by foaming as well as rising particles attached to bubbles.
Type of Study: Research |
Subject:
education health and promotion
Received: 2020/07/16 | Accepted: 2012/02/15 | Published: 2012/02/15
Received: 2020/07/16 | Accepted: 2012/02/15 | Published: 2012/02/15
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