CAJ | 학술논문

SPG 膜微气泡曝气系统可应用于废水好氧处理,SPG 膜污染以及其对化学清洗的耐受性是影响其应用的重要因素。本研究在采用在线化学清洗的微气泡曝气生物膜反应器中,考察了 SPG 膜表面性质对膜污染及化学耐受性的影响。结果表明,在长期运行过程中,SPG 膜表面润湿性对膜污染和化学耐受性具有明显影响。膜表面污染层主要是有机污染,而疏水性膜抗有机污染能力较强。使用在线化学清洗时,碱性次氯酸钠溶液对亲水性膜腐蚀严重,膜孔径和孔隙率显著增大。疏水性膜抗碱性次氯酸钠溶液化学腐蚀能力较强,膜孔结构仅有轻微改变,但是疏水性膜表面疏水官能团易被氧化,使得膜表面润湿性下降。同时,疏水性膜在氧传质、污染物去除和降低能耗等方面具有优势。因此,疏水性 SPG 膜适用于微气泡曝气废水好氧生物处理。
SPG 막미기포폭기계통가응용우폐수호양처리,SPG 막오염이급기대화학청세적내수성시영향기응용적중요인소。본연구재채용재선화학청세적미기포폭기생물막반응기중,고찰료 SPG 막표면성질대막오염급화학내수성적영향。결과표명,재장기운행과정중,SPG 막표면윤습성대막오염화화학내수성구유명현영향。막표면오염층주요시유궤오염,이소수성막항유궤오염능력교강。사용재선화학청세시,감성차록산납용액대친수성막부식엄중,막공경화공극솔현저증대。소수성막항감성차록산납용액화학부식능력교강,막공결구부유경미개변,단시소수성막표면소수관능단역피양화,사득막표면윤습성하강。동시,소수성막재양전질、오염물거제화강저능모등방면구유우세。인차,소수성 SPG 막괄용우미기포폭기폐수호양생물처리。
Shirasu porous glass (SPG) membranes have been applied for microbubble aeration in aerobic wastewater treatment. In the present study, both hydrophilic and hydrophobic SPG membranes were used in a microbubble-aerated biofilm reactor with online chemical cleaning, and their membrane fouling and chemical durability were determined to be strongly dependent on the membrane wettability. The fouling layer formed on the surface of both membranes was confirmed to be mainly organic fouling, and the hydrophobic membrane showed a relatively stronger resistance to the organic fouling. The severe chemical corrosion of the hydrophilic membrane was observed due to exposure to the alkaline sodium hypochlorite solution used for chemical cleaning, which resulted in significant increases in the median pore diameter and the porosity. On the other hand, the pore structure of the hydrophobic membrane changed slightly when exposed to the alkaline sodium hypochlorite solution, suggesting its strong alkali-resistance due to the non-wetting surface. However, the surface hydrophobic groups of hydrophobic membrane could be oxidized by sodium hypochlorite solution, resulting in more wettable membrane surface. The hydrophobic membrane also showed better performance in the respects of oxygen transfer, contaminant removal and energy-saving. Therefore, the hydrophobic membrane seemed more appropriate to be applied for microbubble aeration in aerobic wastewater treatment process.