The objective of this research was to evaluate new types of surfactants based on renewable materials (sugar and protein-based surfactants) for use in ink removal from recycled paper via flotation deinking. By applying green chemistry approaches we aim to minimize the environmental impact of deinking agents and also to open an avenue for a number of products that are to be generated from the uti...

This paper will discuss the use of CFD in foam and froth modelling. The physics of froths is introduced and the methodology of combining the models for each phase into a complete description is reviewed. The utility of the CFD model is illustrated in two ways: First the equations are solved explicitly, giving a clear interpretation of process variables and their importance. Second, an example o...

Fundamental studies of surface forces in foam films are carried out to explain the stability of foams and froths in froth flotation. The thin film pressure balance (TFPB) technique was used to study the surface forces between air bubbles in water from equilibrium film thickness and dynamic film thinning measurements. The results were compared with the disjoining pressure predicted from the Derj...

The effects of a chelating surfactant and different foaming agents on the efficiency of cleaning process waters from a thermomechanical pulp (TMP) mill were studied in a Voith flotation cell. Turbidity measurements and gas chromatography were used to determine the removal extent and characteristics of dissolved and colloidal substances (DisCo). The metal ion content in the process waters before...

A highly efficient froth flotation procedure has been developed for harvesting algae from dilute suspensions. The method does not depend upon the addition of flotants. Harvesting is carried out in a long column containing the feed solution which is aerated from below. A stable column of foam is produced and harvested from a side arm near the top of the column. The cell concentration of the harv...

Protein flotation is a process in which protein molecules are enriched by adsorption at rising bubbles. The bubbles then form foam above the solution, where liquid drains down and dried foam, concentrated protein, extracted. Here, recovery rate purity of extract depend on stability, surface coverage, bubble size, gas flow rate, etc. In this work, we performed experiments using bovine serum albu...

Removal of heavy metals from industrial wastewaters can be accomplished through various treatment options, including such unit operations as chemical precipitation, coagulation, complexation, activated carbon adsorption, ion exchange, solvent extraction, foam flotation, electrodeposition, cementation, and membrane operations. This paper describes these various treatment strategies and methodolo...

Microalgae are promising sources of sustainable biofuels, however high harvesting and enriching costs hamper economic competitiveness. Foam flotation––a low-cost, low-energy adsorptive bubble separation technique––may bridge this gap, yet its efficiency adoption is compromised by a perceived trade-off (based on batch operation) between two key performance indicators: recovery percentage (R%) co...

As environmental regulations are becoming stricter, new techniques must be developed for the removal of trace concentrations heavy metals from mineral processing effluents. Foam separation an interesting alternative to more conventional processes such as ion exchange because their efficiency treat dilute aqueous streams. In this paper, simultaneous Cd2+, Mn2+, and Zn2+ solutions was investigate...

The recovery of scheelite from calcium-bearing carbonate ores by foam flotation is challenging due to its low separation efficiency. This study investigated the effect pentasodium diethylenetriaminepentaacetate (PD) on surface properties and fluorite. For this purpose, we performed micro-flotation tests carried out zeta potential measurements, as well Fourier transform infrared (FT-IR) X-ray ph...