Design And Fabrication Of Oil-Water Separation System With Hydrophobic Coating Wire Mesh Filter For Grease Trap

Ab Wahab, Muhammad Tarmizi (2019) Design And Fabrication Of Oil-Water Separation System With Hydrophobic Coating Wire Mesh Filter For Grease Trap. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Fat, oil and grease (FOG) is a waste disposed directly into the drainage system that may build up around the plumbing system of the wastewater system facility. The objective of this project is to design and development oil water separation system with hydrophobic coating wire mesh filter. The oil water separation system is designed based on engineering design methods such as House of Quality (HOQ), Morphological chart, and Pugh method. Stainless steel wire mesh filter has been tested for water repellent and oil absorption characteristics. Wetting characteristics using ceramic-based coating may protect the surface from degradation and moisture absorption due to the hydrophobicity behavior of the surface after coating. This project showed the characterization and understanding the effect of the difference in pore size of wire mesh on the wetting characteristics performance of the filter mesh with and without a ceramic coating. The ceramic coating used was Titanium Dioxide (TiO2). Contact angle of droplet and morphology surface characterization were evaluated by using contact angle measurement tools and scanning electron microscope (SEM). The result showed, hydrophobicity of uncoated stainless steel of wire mesh will increase if the pore size of wire mesh is decreasing in size. The number of TiO2 coatings was also studied, uncoated, 7 times coating and 14 times coating. It was found that, the more layers of coating increases the hydrophobicity of the wire mesh in increments with contact angle more than 100⁰. For the cooking oil droplet to expeditiously spread over the mesh surface and rapidly permeate through the mesh within < 1 second, showed the oleophilic nature of the mesh. The SEM shows that the roughness of the surface is cause by TiO2 coating. This is one of the factors affecting the hydrophobicity of the surface due to liquidair interfaces under the droplet (air trap) as stated in Wenzel and Cassie-Baxter theory.

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