title: [Effect of Membrane Wettability on Membrane Fouling and Chemical Durability of SPG Membranes].
abstract: 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.
authors: Jing
authors: J
authors: Zhang
authors: Tai-min
authors: TM
authors: Xiao
authors: Jing
authors: J
authors: Zhang
authors: Li-ya
authors: LY
authors: Cao
authors: Ya-wei
authors: YW
authors: Du
authors: Chun
authors: C
authors: Liu
authors: Lei
authors: L
authors: Zhang
mesh_terms: D018441:Biofilms; D019149:Bioreactors; D005898:Glass; D057927:Hydrophobic and Hydrophilic Interactions; D008567:Membranes, Artificial; D045423:Microbubbles; D016062:Porosity; D012973:Sodium Hypochlorite; D062065:Wastewater; D018508:Water Purification; D017155:Wettability
chemical_list: D008567:Membranes, Artificial; D012973:Sodium Hypochlorite; D062065:Wastewater