Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Optimizing dissolved air flotation design and saturation.

L A Féris1, C W Gallina, R T Rodrigues

  • 1Departamento de Engenharia de Minas-PPGEM-Laboratório de Tecnologia Mineral e Ambiental-Universidade Federal do Rio Grande do Sul, Av. Osvaldo Aranha 99/512, 90035-190, Porto Alegre, RS, Brazil. laferis@vortex.ufrgs.br

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|June 8, 2001
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Reply to Discussion by R. A. Henderson of 'Kinematics of the Clarke River Shear Zone (northeastern Australia) and implications for the tectonic evolution of the Tasmanides'.

Australian journal of earth sciences (Online)·2026
Same author

Training in hot water immersion improved exercise performance in hot and humid conditions in recreational athletes - a randomized controlled trial.

European journal of applied physiology·2025
Same author

Navigating the Mental Lexicon: Network Structures, Lexical Search and Lexical Retrieval.

Journal of psycholinguistic research·2024
Same author

Fluctuation Relations to Calculate Protein Redox Potentials from Molecular Dynamics Simulations.

Journal of chemical theory and computation·2023
Same author

Eudragit® L100/chitosan composite thin bilayer films for intravaginal pH-responsive release of Tenofovir.

International journal of pharmaceutics·2022
Same author

Randomized placebo-controlled phase II trial of high-dose melatonin mucoadhesive oral gel for the prevention and treatment of oral mucositis in patients with head and neck cancer undergoing radiation therapy concurrent with systemic treatment.

Clinical & translational oncology : official publication of the Federation of Spanish Oncology Societies and of the National Cancer Institute of Mexico·2021
Same journal

Pyrolysis temperature shapes the structure and filtration capacity of spent-coffee-ground biochar for 1-μm microplastics and bacteria removal from wastewater.

Water science and technology : a journal of the International Association on Water Pollution Research·2026
Same journal

Effect of cooling and cover material on the performance of a solar humidification-dehumidification system used for brine concentration.

Water science and technology : a journal of the International Association on Water Pollution Research·2026
Same journal

Comparative multi-criteria assessment of decentralized wastewater treatment technologies for coastal tourist communities and island slaughterhouses: a design framework with uncertainty analysis for Latin America.

Water science and technology : a journal of the International Association on Water Pollution Research·2026
Same journal

An improved relative frequency method for flood season partitioning.

Water science and technology : a journal of the International Association on Water Pollution Research·2026
Same journal

Drivers of wastewater dynamics: a statistical analysis of England's large wastewater treatment works.

Water science and technology : a journal of the International Association on Water Pollution Research·2026
Same journal

A review on modification of piezoelectric materials for wastewater treatment: mechanisms, applications, and future perspectives.

Water science and technology : a journal of the International Association on Water Pollution Research·2026
See all related articles

Dissolved air flotation (DAF) can occur at lower pressures with surfactants. Modified equipment and bubble sizes improve iron precipitate recovery in DAF processes.

Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Chemical Engineering

Background:

  • Dissolved air flotation (DAF) is a key process for removing precipitates like iron hydroxide.
  • Conventional DAF requires specific operating pressures, impacting efficiency.
  • Fragile coagula can be challenging to collect effectively in DAF systems.

Purpose of the Study:

  • To investigate DAF performance at pressures below 3 atm.
  • To evaluate the impact of surfactants and equipment modifications on DAF efficiency.
  • To optimize bubble characteristics for improved precipitate collection.

Main Methods:

  • Studied DAF of iron hydroxide precipitates under varying saturation pressures.
  • Utilized modified flotation units and different bubble size distributions.

Related Experiment Videos

  • Compared bubble entrance positions and employed a "mushroom" type diffuser.

    • Main Results:

    • DAF was achieved at 2 atm saturation pressure with surfactants, compared to 3 atm without.
    • Modified equipment and bubble size distribution (micro and mid-sized) enhanced precipitate recovery.
    • A "mushroom" type diffuser improved performance by optimizing bubble entrance into the capture zone.

    Conclusions:

    • Lowering air/water surface tension with surfactants enables DAF at reduced pressures.
    • Equipment design and bubble size control are critical for efficient DAF of fragile precipitates.
    • Optimized mass transfer and bubble dynamics enhance DAF process kinetics and recovery rates.