Sharif Digital Repository

Chemical dispersants applied to the surface of Persian Gulf during the oil spill in 2010 were more than one million gallons. Following the addition of dispersants, oil mixes below the seawater surface and can be degraded or dissolved into the water column. The aforementioned condition is a perfect opportunity for degradation of organic pollutants using Ultraviolet light emitting diodes Advanced Oxidation Processes (AOPs). These methods are based on activation of oxidants such as persulfate and hydrogen peroxide to generate extremely reactive radicals. Dispersants would increase the degradation rate by providing more active area (homogenous solution) for these radicals. AOPs have shown to... 

One of the newest technologies in order to separate oil from water and also oil wastewater is the axial vortex separator technology (with commercial name of voraxial). In the current project, we analyze one of the voraxial (2000) separator systems types. In the modeling of voraxial system, we utilize a 3D model which is developed on the basis of commercial sample of voraxial 2000 technology, and conduct the solution of particles and fluid with Lagrangian Eulerian approach. Considering the k-ɛ turbulence model and an incompressible flow with the input of 30GPM and rotational velocity of 400RPM was another segment of the project. Due to the largeness of 10µ particles diameter, the Brownian... 

The phenomenon of vortex flow, is one of the most predominant streams in the nature. This phenomenon yielded by the motion of vortices, produces up to 1000 times acceleration of the Earth’s gravity. The issues of uncontrolled harvesting of oil wells and increase the life of the wells, which cause to increase in the extracted crude salt, reveal the importance of waste management and both handling and refining petroleum. According to global statistics, for every extracted barrel of oil, three barrels of water are yielded. Therefore, 250 million produced water barrels per day is produced.The separator technology with vortex core (brand Voraxial) is one of the latest technologies in waste-water... 

Oil/water separation is an important field, not only for scientific research, but also for environmental, economic, and social issues. On the one hand, oily wastewater, resulting from industries such as steel, aluminum, food, textile, leather, petrochemical and metal finishing, has become the most common pollutant all over the world. On the other hand, frequent oil spill accidents are of great concern since the discharge can lead not only to serious environmental pollution, but also a great loss of energy.
In crude oil removing water is necessary due to reducing corrosion, increasing thermal values of fuels obtained from crude oil, preventing catalists from destruction by water and... 

The produced crude oil from the petroleum reservoirs usually has a value of brine (water and salt) this matter can be caused the corrosion of refinery equipment. The large part of this brine creates a stable emulsion with oil, that it couldn't be separated easily. For separation and demulsification of this emulsion, some chemical, mechanical, thermal and electrical methods can be executed. In chemical method, demulsifier materials can be added to water-in-oil emulsion. Different parameters such as properties of oil, type and concentration of demulsifiers, volume factor of water and etc., can affect the efficiency of water-in-oil emulsion separation. In this study, emulsification mechanism,... 

In recent years, the crude oil spills in the oceans and the excessive emission of electromagnetic waves in the living environment have threatened human health. Therefore, different methods have been considered to deal with each of these two threats. Recently, the use of polymeric boron nitride composites in the production of crude oil absorbents and electromagnetic wave shieldings has received attention due to its thermal conductivity, thermal and chemical stability. In the first step of this research, superhydrophobic composites of polyurethane sponges were prepared by boron nitride and electrically conductive nanomaterials that had photothermal and electrothermal properties. The results...