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biofouling
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Biofouling Reduction in Reverse Osmosis Membrane for the Purification Brackish Water
, M.Sc. Thesis Sharif University of Technology ; Soltanieh, Mohammad (Supervisor) ; Mousavi, Abbas (Supervisor)
Abstract
In this project, modification of reverse osmosis membrane was investigated in order to reduce the biofouling in treatment of brackish water. Furthermore, the technique which is used to attain the favorable results is graft polymerization to modify the membrane’s surface with grafting acrylic acid as hydrophilic monomer onto polyamide exploited as last layer in reverse osmosis membrane. This technique is a free radical grafting, andfree radicals which are needed for grafting are provided by the redox system potassium persulfate-sodium metabisulfite which was used as initiator. To figure out the best concentration of acrylic acid, initiator and process time in order to achieve a new membrane...
Investigation of Antifouling Coating Paint on Steel
, M.Sc. Thesis Sharif University of Technology ; Afshar, Abdollah (Supervisor)
Abstract
Plants and aquatic creatures growth on the surface of human made structures is a typical phenomena. One of the approaches to prevent algae and moss to grow is using paint coatings including biocides. In this research project, anti-moss paints containing Copper Oxide as the major biocide and Zinc Oxide as the minor biocide have been synthesized. The effects of different parameters like the type of resin, biocide concentration, biocide grain sizes, dip time, and the coating layer thickness on the release rate which is the most important factor to prevent moss growth, have been investigated. Then, the experiment has been conducted on the specimens in algae growth and flustered sea water...
Optimizing the Aquaculture Net Washer's Washing System
, M.Sc. Thesis Sharif University of Technology ; Khorasanchi, Mahdi (Supervisor) ; Mehdigholi, Hamid (Supervisor)
Abstract
In this project, experimental investigation and optimal design of the aquaculture netwasher process for biofouling removal have been studied. In the first phase, various types of marine biological deposits and their characteristics were examined, and the most prevalent type with the highest adhesion was selected for the net. In the second phase, different cleaning methods were evaluated, and the most efficient method considering cost, equipment, and speed was chosen. Following an assessment of the challenges, advantages, and disadvantages of the mentioned methods, a rotational disk system was selected as the preferred system due to its cost-effectiveness, cleaning speed, reduced damage to...