Application of a simplified model for assessing particle removal in dissolved air flotation (DAF) systems: Experimental verification at laboratory and full-scale level

Particle-bubble collisions in dissolved air flotation (DAF) systems play a crucial role in the removal of total suspended solids (TSS). DAF particle-bubble collision models incorporate factors such as particle diameters, charge and density, bubble diameters, and collision factors. The challenge lies in accounting for the wide range of...

Numerical Modelling of Offshore Pipeline Flotation during Sand Backfilling: Development and validation of a simplified predictive model

Offshore pipelines are considered the arteries of the offshore oil and gas industry and transport hydrocarbon products as well as other fluids. During the installation process of an offshore pipeline, the pipeline is most often located in a trench and covered with backfill material. The burial of the pipeline ensures onbottom stability as well...

High suspended solids removal of Indian drain water with a down-scaled Dissolved Air Flotation (DAF) for water recovery. Assessing water-type dependence on process control variables

The Barapullah drain crosses through New Delhi, India, and transports millions of cubic meters of stormwater, municipal sewage and industrial sewage to the Yamuna River. Seasonal variations and ambiguous annual discharges cause 20-fold fluctuations in hydraulic flows, pollutants type and concentration. Furthermore, New Delhi is among the most...

Pipeline flotation in liquefied sand: A simplified transient model

Submarine buried pipelines are often laid in trenches backfilled with loose sandy soil, which is intrinsically prone to liquefaction. When liquefaction is triggered, the soil tends to behave as a viscous fluid with vanishing shear strength and very limited ability to restrain structural displacement, for instance during the occurrence of...

Offshore Pipeline Flotation during Sand Backfilling with a TSHD: An Experimental Study

Offshore pipelines represent major items in the oil and gas industry nowadays. These submarine pipelines are usually covered with backfill for protection and a well-known method for this is sand backfilling with a trailing suction hopper dredger (TSHD). Although pipeline installation with a TSHD is a developed technique, there are still some...

Investigating Critical Parameters of Dissolved Air Flotation(DAF) for Solid-Liquid Separation with Different Influents as part of the LOTUSHR Project

Many rapidly expanding cities around the world including India’s capital New Delhi face increasing potable water quality and health risks due contaminated open drains carrying the cities untreated wastewater into the adjoining river, which is also the city’s water source. To tackle this problem in a practical and holistic way, innovative...

Effect of aeration by micro - bubbles on methane production in anaerobic digestion

This study aims to look at the effect of introducing controlled amounts of oxygen on biogas quantity and quality during anaerobic digestion. The anaerobic digestion process is studied, specifically, it’s biochemical processes, to understand the effect of addition of oxygen. Anaerobic sludge is aerated to mimic DAF (Dissolved Air Flotation)...

Recovery of cerium from glass polishing waste: A critical review

Ceria is the main component in glass polishing powders due to its special physico-chemical properties. Glass polishing powder loses its polishing ability gradually during usage due to the accumulation of other compounds on the polishing powder or due to changes in the particle size distribution. The recovery of cerium from the glass polishing...

Pipe uplift in liquefied sands: The case of induced earthquakes in the Groningen area

This study considers pipe uplift in liquefied sands in case full liquefaction occurs in the Groningen area. Due to the short vibration time, approximately 2 seconds, uplift is considered in fully liquefied sands without vibrations. The liquefaction time and resistance against uplift are determined by experiments. The resistance against uplift is...

Up-scaling of froth flotation equipment

The up-scaling of flotation equipment has been investigated based on comparisons between laboratory, pilot and industrial scale flotation tests and a characterization study of large-scale industrial flotation cells in Boliden’s Aitik copper mine in Northern Sweden. The use of high volume flotation cells has nowadays become more and more common...

Turbulent Particle Transport and its Effect on Flotation

This thesis studies the hydrodynamics of froth flotation, a process that is used in industry as a means of removing small inclusions from the treated liquid by gas bubble injection. This work is particularly motivated by the removal of aluminium and silicon oxides from liquid steel. Hydrodynamic aspects have a strong influence on the efficiency...

Treatment of coarse material in flotation

The treatment of coarse particles was approached from two perspectives. A techno-economic study had to reveal the potential of a Derrick 5-deck Stack Sizer\textregistered in a flotation circuit. This fine wet screening technology has a high capital expenditure. This is a disadvantage since investors try to suppress the capital costs in an early...

Testing reagents to improve the recovery of ilmenite flotation at Titania A/S

Mineral processing plays an important part in providing our society with much needed resources. These processes, however, could be made much more efficient. Advancements in this field would enable a population to make economical use of its resources. One widely-used ore processing method to separate target minerals from other minerals is froth...

Sulphide Mineral Flotation

The report describes a research project conducted by Louis Carlier in January 2009 at Titania AS, ilmenite mine in Norway. This research project focuses on the first testing stage of three, namely: laboratory cell test , pilot cell test, full scale test. The purpose of this research project was to provide information on the flotation behaviour...

Selective recovery of micrometer bioparticles using aggregation and air flotation

Air flotation is a separation technique that makes use of the air-water interface for separation of particles and molecules from mixtures. This thesis discusses its use for separation of bioparticle mixtures. Particulate bioproducts, such as crystals, inclusion bodies, virus-like particles and precipitates, can be produced inside microbial cells...