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Dissolved air flotation and me
Abstract
This paper is mainly a critical review of the literature and an assessment of what we know about dissolved air flotation (DAF). A few remarks are made at the outset about the author's personal journey in DAF research, his start and its progression. DAF has been used for several decades in drinking water treatment as an alternative clarification method to sedimentation. DAF is particularly effective in treating reservoir water supplies; those supplies containing algae, natural color or natural organic matter; and those with low mineral turbidity. It is more efficient than sedimentation in removing turbidity and particles for these type supplies. Furthermore, it is more efficient in removing Giardia cysts and Cryptosporidium oocysts. In the last 20 years, fundamental models were developed that provide a basis for understanding the process, optimizing it, and integrating it into water treatment plants. The theories were tested through laboratory and pilot-plant studies. Consequently, there have been trends in which DAF pretreatment has been optimized resulting in better coagulation and a decrease in the size of flocculation tanks. In addition, the hydraulic loading rates have increased reducing the size of DAF processes. While DAF has been used mainly in conventional type water plants, there is now interest in the technology as a pretreatment step in ultrafiltration membrane plants and in desalination reverse osmosis plants.
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“In the dissolved air flotation, air (or gas) is fed to wastewater to generate micro-bubbles that could attach the metal ions, developing lower density agglomerates, leading to raising the flocs through the wastewater.The accumulated slug at the top surface can easily be removed 93 .”
From Removal of heavy metal ions from wastewater: a comprehensive and critical review (2021) · cites this paper as [93]
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Metadata
- Authors
- Edzwald, J. K.
- Affiliations
- University of Massachusetts Amherst (US)
- Corresponding author
- Edzwald, James K.
- Venue
- Water Research
- Publisher
- Elsevier BV
- Published
- 2010-04
- Volume
- 44
- Issue
- 7
- Pages
- 2077-2106
- ISSN
- 0043-1354 (ISSN-L)
- OpenAlex
- W2013603630
- Cited by
- 460
- References
- 74
- Citations by year
- 2026: 20 · 2025: 30 · 2024: 35 · 2023: 38 · 2022: 47 · 2021: 35 · 2020: 32 · 2019: 35 · 2018: 35 · 2017: 41 · 2016: 24 · 2015: 25 · 2014: 19 · 2013: 17 · 2012: 13
- FWCI
- 14.26
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Water Research (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Coagulation and Flocculation Studies
- Physical Sciences › Chemical Engineering › Filtration and Separation › Minerals Flotation and Separation Techniques
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Water Treatment and Disinfection
- Keywords
- dissolved air flotation, drinking water treatment, reservoir water, turbidity removal, Giardia cysts, Cryptosporidium oocysts, algae, natural organic matter, coagulation, flocculation, hydraulic loading rate, ultrafiltration pretreatment, reverse osmosis pretreatment, process modeling
- MeSH terms
- Air, Algorithms, Cryptosporidium, Solubility, Waste Disposal, Fluid, Water, Water Microbiology, Water Supply, Water Purification, Eukaryota
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