林礽龍 - Leo

- Thesis topic: Optimization of Porous Hydrophobic Membranes Applied in Membrane Distillation for Water Recovery and Ammonia Recovery Using Response Surface Methodology

- Doi: 

- Abstract: 

        The United Nations Sustainable Development Goal 6 focuses on the preciousness of freshwater resources and hopes to ensure a sustainable supply of freshwater by cherishing and improving the efficiency of water resource utilization and water recycling. More and more businesses expect to improve their performance gradually.
         Among the various water and resource recovery technologies, the application of membrane has become an important research area due to the rapid advancement of the technology in the field of water and resource recovery, among which the membrane distillation technology has attracted many researchers to apply it in the area of water and resource recovery because it only requires a low-temperature heat source and has high rejecting characteristics for dissolved salts.
         This study is divided into two parts. Firstly, the flux of water and its recovered water quality are investigated. The results showed that the R2adj of the predicted flux model was 0.995, indicating that the expected flux model could explain the actual fluxes well.
        The second part of the study is the application of ammonia recovery. In addition to comparing the actual flux performance of different module designs and membrane types. This study aims to investigate whether other operational parameters affect the effectiveness of ammonia recovery, except for the well-known pH as the main influencing factor. The results show that part of the specific interaction of factors has a more significant influence on the overall mass transfer coefficient of ammonia and the removal efficiency of ammonia than the main effect of the factors. This study also conducts actual wastewater ammonia recovery and concentration tests to reach NH3-N 79,544mg/L and cost and benefit assessments to serve as a reference for designing future field-scale ammonia recovery plants.

Keywords: Membrane distillation, water recovery, ammonia recovery, the overall mass transfer coefficient, interaction of factors