Flotation Thickening

Wang, Lawrence K.; Shammas, Nazih K.; Selke, William A.; Aulenbach, Donald B.

doi:10.1007/978-1-59259-996-7_3

Cited by 22 publications

(26 citation statements)

References 7 publications

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“…Gas flotation is very efficient as it allows to rapidly treat large quantities of produced waters. Induced and gas flotation are the most commonly used flotation technologies. , Both methods are very effective in floating small suspended droplets . An overview of oil–water separation using gas flotation systems can be found in ref .…”

Section: Introductionmentioning

confidence: 92%

Role of Bubble–Drop Interactions and Salt Addition in Flotation Performance

et al. 2018

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Gas flotation is an efficient technique used in the petroleum industry to remove oil contamination from produced water. This method is based on attaching air bubbles to oil droplets to make oil droplets rise faster. We investigated the role of water salinity in the efficiency of the process, using a model flotation column. We show that flotation efficiency increases with water salinity, highlighting the importance of the electrostatic repulsion between oil drops and air bubbles. We also studied the attachment between drops and bubbles, monitoring the temporal evolution of the thin films between them. Stable attachment requires that the water films formed between oil drops and air bubbles break and the oil spreads at the bubble surface. Increasing the salinity of the solution decreases the repulsion between the oil drops and the air bubbles, which in turn decreases the water film stability. The films rupture more readily, improving the drop–bubble attachment and thus the flotation efficiency. The differences in water salinity can therefore lead to important changes in the flotation efficiency.

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Section: Introductionmentioning

confidence: 92%

Role of Bubble–Drop Interactions and Salt Addition in Flotation Performance

et al. 2018

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“…et al, [80] reported DAF construction costs for a specified volume. EPA published investment cost equations for production flow ranges [81].…”

Section: Capital Costsmentioning

confidence: 99%

Optimal design of water treatment processes

Koleva

Polykarpou

Liu

et al. 2016

Desalination and Water Treatment

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Predicted water shortages assign water treatment a leading role in improving water resources management. One of the main challenges associated with the processes remains early stage design of techno-economically optimised purification. This work addresses the current gap by undertaking a whole-system approach of flowsheet synthesis for the production of water at desired purity at minimum overall cost. The optimisation problem was formulated as a mixed integer non-linear programming (MINLP) model. Two case studies were presented which incorporated the most common commercial technologies and the major pollution indicators, such as chemical oxygen demand (COD), dissolved organic carbon (DOC), total suspended solids (TSS) and total dissolved solids (TDS).The results were analysed and compared to existing guidelines in order to examine the applicability of the proposed approach.

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“…Compared with stock tanks and hydrocyclones, flotation has the characteristics of rapid treatment of large amounts of oily wastewater . Either induced gas flotation or dissolved gas flotation can effectively remove suspended micro-oil droplets in wastewater, − These methods are formed by the attachment of an oil droplet to a gas bubble to form an aggregate. The large density difference between the oil–bubble aggregate and water accelerates the rise in velocity of the aggregate to the surface of the water. , …”

Section: Introductionmentioning

confidence: 99%

Interfacial Behavior and Internal Microflow of an Oil Droplet during the Process of the Oil Droplet Covering a Gas Bubble: Without and with NaCl

Yan

Zhang

Yang

et al. 2021

Ind. Eng. Chem. Res.

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Flotation is an efficient pretreatment technology for oily water. In this paper, the effect of NaCl concentration on the process of an oil droplet covering a gas bubble was investigated experimentally. The results show that capillary waves are formed on the surface of the oil droplet during the coverage process. After capillary wave propagation, the surface of the droplet will form a constricted neck area, and the interfacial force of this area generates negative pressure, which induces the bubble to enter the inside of the oil droplet. The increase in NaCl concentration in water makes the neck area have greater suction. This results in the oil droplet stretching the bubbles more vigorously, promotes the spreading of the oil droplet on the surface of the bubble, and shortens the covering time. Moreover, in water with higher NaCl concentration, there is a greater flow velocity in the confluence region of the oil droplet.

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Flotation Thickening

Cited by 22 publications

References 7 publications

Role of Bubble–Drop Interactions and Salt Addition in Flotation Performance

Role of Bubble–Drop Interactions and Salt Addition in Flotation Performance

Optimal design of water treatment processes

Interfacial Behavior and Internal Microflow of an Oil Droplet during the Process of the Oil Droplet Covering a Gas Bubble: Without and with NaCl

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