Dissolved Air Flotation (DAF) for Wastewater Treatment

2017 ◽  
pp. 657-694
Author(s):  
Puganeshwary Palaniandy ◽  
Hj. Mohd Nordin Adlan ◽  
Hamidi Abdul Aziz ◽  
Mohamad Fared Murshed ◽  
Yung-Tse Hung
Keyword(s):  
Wastewater Treatment ◽  
Dissolved Air Flotation ◽  
Air Flotation ◽  
Dissolved Air

Evaluation of flocculation and dissolved air flotation as an advanced wastewater treatment

2001 ◽  
Vol 43 (8) ◽  
pp. 83-90 ◽  
Author(s):  
A. C. Pinto Filho ◽  
C. C. Brandão
Keyword(s):  
Wastewater Treatment ◽  
Domestic Wastewater ◽  
High Rate ◽  
Advanced Treatment ◽  
Dissolved Air Flotation ◽  
Anaerobic Reactor ◽  
Treatment Processes ◽  
Domestic Wastewater Treatment ◽  
Air Flotation ◽  
Dissolved Air

A bench scale study was carried out in order to evaluate the applicability of dissolved air flotation (DAF) as an advanced treatment for effluents from three different domestic wastewater treatment processes, namely: (i) a tertiary activated sludge plant ; (ii) an upflow sludge blanket anaerobic reactor (UASB); and (iii) a high-rate stabilization pond.

Optimising dissolved air flotation/filtration treatment of algae-laden lagoon effluent using surface charge: a Bolivar treatment plant case study

2012 ◽  
Vol 66 (8) ◽  
pp. 1684-1690 ◽  
Author(s):  
Russell Yap ◽  
Michael Holmes ◽  
William Peirson ◽  
Michael Whittaker ◽  
Richard Stuetz ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Surface Charge ◽  
Wastewater Treatment Plant ◽  
Pilot Plant ◽  
Treatment Plant ◽  
Dissolved Air Flotation ◽  
Air Flotation ◽  
A Charge ◽  
Dissolved Air

Dissolved air flotation (DAF) incorporating filtration (DAFF) is used at the Bolivar wastewater treatment plant (WWTP) to polish lagoon effluent for reuse. Elevated algal populations are frequently experienced and can lead to increased coagulant requirements and process control issues. Streaming current detectors (SCDs) and a charge demand analyser (CDA) were used to monitor the full-scale plant. This was followed by an optimisation study using a pilot plant with a CDA. It was found that the normal operational charge demand range for DAF at Bolivar was between −46 and −40 μeq L−1. Decreasing the pH of coagulation reduced coagulant consumption and facilitated more sensitive CDA responses to changes in alum dose.

scholarly journals Simulation and control of dissolved air flotation and column froth flotation with simultaneous sedimentation

2020 ◽  
Vol 81 (8) ◽  
pp. 1723-1732 ◽  
Author(s):  
Raimund Bürger ◽  
Stefan Diehl ◽  
María Carmen Martí ◽  
Yolanda Vásquez
Keyword(s):  
Wastewater Treatment ◽  
Steady State ◽  
Froth Flotation ◽  
Operating Conditions ◽  
Dynamic Simulations ◽  
Dissolved Air Flotation ◽  
One Dimensional ◽  
Drift Flux ◽  
Air Flotation ◽  
Dissolved Air

Abstract Flotation is a separation process where particles or droplets are removed from a suspension with the aid of floating gas bubbles. Applications include dissolved air flotation (DAF) in industrial wastewater treatment and column froth flotation (CFF) in wastewater treatment and mineral processing. One-dimensional models of flotation have been limited to steady-state situations for half a century by means of the drift-flux theory. A newly developed dynamic one-dimensional model formulated in terms of partial differential equations can be used to predict the process of simultaneous flotation of bubbles and sedimentation of particles that are not attached to bubbles. The governing model is a pair of first-order conservation laws for the aggregate and solids volume fractions as functions of height and time. An analysis of nonlinear ingredients of the governing equations helps to identify desired steady-state operating conditions. These can be chosen by means of operating charts, which are diagrams that visualize regions of admissible values of the volumetric flows of the feed input and underflow outlet. This is detailed for the DAF thickening process. Dynamic simulations are obtained with a recently developed numerical method. Responses to control actions are demonstrated with scenarios in CFF and DAF.

scholarly journals Dissolved Air Flotation: A Review from the Perspective of System Parameters and Uses in Wastewater Treatment

TecnoLógicas ◽  
2021 ◽  
Vol 24 (52) ◽  
pp. e2111
Author(s):  
Jeimmy Adriana Muñoz-Alegría ◽  
Elena Muñoz-España ◽  
Juan Fernando Flórez-Marulanda
Keyword(s):  
Climate Change ◽  
Wastewater Treatment ◽  
Biogas Production ◽  
Clean Energy ◽  
Design Parameters ◽  
Wastewater Reclamation ◽  
Dissolved Air Flotation ◽  
Flotation Process ◽  
Air Flotation ◽  
Dissolved Air

The current issues of climate change and high freshwater demand worldwide have promoted the implementation of wastewater reclamation technologies. This study aims to review the efficiency of the dissolved air flotation (DAF) technique in a wide variety of applications in the agricultural, industrial, domestic, and municipal sectors, which have high freshwater consumption worldwide. We made a systematic review of the DAF technique in wastewater treatment in 2015-2021. We reviewed six indexed databases and governmental statistical reports; we used the keywords: dissolved air flotation, microbubbles, wastewater treatment, and the main operating and design parameters involved in the effectiveness of the flotation process. Additionally, we conducted a review of the most common synthetic coagulant studies used with DAF, as well as natural coagulants that promise to mitigate current climate change. Finally, we discussed advantages, disadvantages, and potential future studies. DAF to have considerable potential for wastewater treatment, as well as for waste utilization. The generation of large quantities of DAF sludge is a breakthrough for clean energy production, as it allows the use of this waste for biogas production.

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