Journal of Research in Environmental Health

Journal of Research in Environmental Health

Efficiency of Air Flotation Process in Removal of Oil and Grease from Steel Mill Wastewater

Authors
Nasrin Abdollahi 1
Mohammad Hadi Dehghani 2
Kazem Nadafi 2
Fazlollah Changani 3
Amir Hossein Mahvi 3
Niaz Mahdi Esfahani 1
1 Tehran University of Medical Sciences, School of Public Health, Department of Environmental Health Engineering, Tehran, I.R.Iran
2 Professor, Tehran University of Medical Sciences, School of Public Health, Department of Environmental Health Engineering, Tehran, I.R.Iran.
3 Assistant Professor, Tehran University of Medical Sciences, School of Public Health, Department of Environmental Health Engineering, Tehran, I.R.Iran.
10.22038/jreh.2015.5181
Abstract
Background and objective: Oil and grease causes damages for aquatic organisms, soil ecosystem, and mutagenic and carcinogenic for human. The aim of this research was to study the reduction of pollution of oil and grease of steel mill wastewater with Air Flotation system.

Materials and Method: At first phase of this examination the sampling performed of raw wastewater for determine amount of oil and grease, COD, TS, TDS, TSS, Turbidity and Alkalinity. The second phase flotation with dispersed air performed at pilot vessel and the second sampling performed for determination
of removal efficiency of oil and grease in 3 different concentration and 4 different retention time and measured for other parameters in best concentration and retention time.

Results: The retention time were selected 30, 45, 60 and 90 min and concentrations were 591 mg/l, 386 mg/l and 277 mg/l. removal efficiency for parameters of oil and grease, COD, TS, TDS, TSS, Turbidity, Alkalinity, obtained %48, %46, %37, %36, %82, %89, %6.

Conclusion: This study showed with increases of retention time from 30minute to 90minute removal efficiency for all of parameters gently increased but between 60 and 90 minute retention time removal efficiency was almost stable. Removal efficiency in high concentration of oil and grease(591mg/l) was more than removal efficiency in low concentration of oil and grease (277mg/l).

Paper type: Research article
Keywords
Air flotation
Oil and grease
Wastewater
Steel factory
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Journal of Research in Environmental Health
Volume 1, Issue 2 - Serial Number 2
Summer 2015
Pages 104-111