Preparing PVDF Membranes for Use in Removing Aqueous Ammonia by Membrane Contactor

• Main Authors: Chih-Chan Lin, 林志展
• Other Authors: Cheng-Lee Lai
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/9had2f

碩士 === 嘉南藥理科技大學 === 環境工程與科學系 === 100 === The High-Tech Industries have been rapidly developing for the last two decades in Taiwan, which also result in high concentrations of various nitrogenous compounds in the wastewater. Although biological nitrification–denitrification methods have been used in reducing ammonia–nitrogen content in sewage effluent to an acceptable level, the effectiveness of this process is restricted by slow bioconversion and unfavorable environmental factors. It is necessarily to find an efficiency process of promoting the removal of ammonia from wastewater. Polyvinylidene fluoride (PVDF) membranes with asymmetric structures and good hydrophobicity will prepare by a phase-inversion method and have been applied to removal of ammonia from water by membrane contactor. Aqueous solution containing sulfuric acid was used as stripping solution to accelerate the removal of ammonia. Membrane contact system using PTFE membrane to sweep the clossflow module. The ammonium chloride aqueous solution pH value at 11 extract by phosphoric acid solution, NH4+ removal was 88.16%. NH4+ removal up to 100% after extract by sulfuric acid for 2 hr. Membrane contact system with immersion module using PVDF membrane was studied. NH4+ removal increase with polymer concentration reduced. After continuous 10 times operation with PVDF membrane witch take 135 hr, NH4+ removal still reach 99.24%. Every liter of sulfuric acid can extraction 22.5 g of NH4+. PVDF membrane’s durable performance was suitable for long turn operation.