This study investigated the effect of oxygen and micro-cracking on the flotation of low grade nickel sulphide ore. The ore treated contained serpentine minerals which have a history of being difficult to process efficiently. The use of oxygen as a bubbling gas has been noted to be effective because it increases the pulp potential. The desired effect of micro cracking the ore is that the nickel ...

A methodology for modelling and designing H∞ controllers for an experimental pilot-scale flotation column plant is described. Experimental results, including the modelling procedure and an H∞ design, are presented. For this purpose, different models, for different operating conditions, are determined, by means of system identification techniques. A strategy to get the uncertainty model, using a...

Dissolved air flotation (DAF), an effective treatment method for clarifying algae/cyanobacteria-laden water, is highly dependent on coagulation-flocculation. Treatment of algae can be problematic due to unpredictable coagulant demand during blooms. To eliminate the need for coagulation-flocculation, the use of commercial polymers or surfactants to alter bubble charge in DAF has shown potential,...

Distribution and elimination of petroleum products can be predicted in aerobic wastewater treatment plants (WWTPs) using models such as multimedia fate model SimpleTreat. An advantage the SimpleTreat is that it only requires a few basic properties chemical to calculate partitioning, biodegradation ultimately emissions air, surface water produced sludge. The structure reflects WWTP scheme. Howev...

Two high-fat containing side streams from the chocolate industry were evaluated as an alternative renewable substrate for biochemical long-chain dicarboxylic acid (DCA) production by Candida tropicalis. Cleaning water liquid transport and dissolved air flotation (DAF) sludge wastewater treatment plant contained 29 18 m% fat respectively. The addition of up to 100 g.L−1 ‘chocolate water’ 80 % (v...

Flocculation achieved by raising the pH, termed alkaline flocculation is a sustainable way of inducing in marine microalgae. Flocs formed post-alkaline have potential to be harvested via dissolved air flotation (DAF) or sedimentation. While DAF results faster separation and biomass with higher solids content compared sedimentation, it has not been tested saline environments, particularly when c...

Raw water clarification by flotation was studied by injecting air into a centrifugal multiphase pump to generate microbubbles (MBs) and nanobubbles (NBs). Measurements of gas dispersion parameters were performed and optimal conditions were obtained using a pump pressure of 4 bar. Values showed a bubble Sauter diameter of 75 μm, an air holdup of 1.2%, a bubble surface area flux of 34 s-1 and an ...

Abstract To solve the problems of unstable chemical oxygen demand (COD), turbidity and suspended solid (SS) removal for electrocatalytic process operation subsequent ultrafiltration membrane–reverse osmosis membrane in a centralised fracturing wastewater treatment plant Inner Mongolia, integrated dissolved ozone flotation (DOF) was proposed to replace original process. Multiple processes, such ...