Investigation of Fouling Phenomenon on Nanofiltration(NF)and the Efficiency of Microwave to Prevent Membrane Fouling

• Main Authors: YOU, ZI-YI, 游子儀
• Other Authors: LIN, PO-HSUN
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/8qa572

碩士 === 明志科技大學 === 環境與安全衛生工程系環境工程碩士班 === 107 === In Taiwan, a large number of discarded oyster shells are produced every year, accompanied by stench, mosquitoes and other situations. Therefore, we urgently need to find a solution for the proper reuse of discarded oyster shells. The problem of water resources scarcity in Taiwan is becoming more and more serious, and the dependence on groundwater is growing. How to remove heavy metals with economical, effective and environmentally friendly technologies is our most urgent issue. In this study, oyster shell powder with a particle size of 0.840 mm ~ 1.190 mm, iron-coated oyster shell powder and manganese-coated oyster shell powder were used as media to simulate heavy metals in groundwater. The experiment used a PVC column to fill a 25 cm high medium and fixed it under the environmental conditions of pH 6 ~ 6.5 similar to the actual groundwater. The simulated groundwater with 3 selected heavy metals (Iron, Manganese and Arsenic) and tap water was mixed at a flow rate of 1.67 L/h. It is introduced into the column for filtration. From the results of the study, it is known that the Iron-coated oyster shell powder have the best removal of arsenic. When the experiment is 196th hour, there is still more than 40% of the removal ability. The manganese-coated oyster shell powder have the best removal of manganese. More than 85% of the removal capacity was achieved at the end of the 196 hour experiment. Then, after the backwashing with tap water, the filtration test was again carried out to observe whether or not the adsorption capacity was restored. However, it was found that the effect of backwashing with tap water was not good. Regeneration with 0.1M HCl can temporarily restore its high adsorption capacity, but it is stable at low removal efficiency after 8 hours. Based on the results of this study, oyster shell powder, iron-coated oyster shell powder and manganese-coated oyster shell powder have the ability to treat heavy metals in groundwater.