Factors Affecting Performances of Micro-Perforated Polyurethane Membrane Diffusers

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Jong Kuk Kim³  Joon Taek Oh¹  Ji Tae Kim² 

[1] ENET Com.;Department of Environmental and Energy Systems Engineering, Kyonggi University;Department of Chemical and Bio Engineering, Konyang University

关键词: Diffuser;    Aeration;    Polyurethane Membrane;    Bubble Size Distribution;   

DOI  :  10.1252/jcej.14we013

来源: Maruzen Company Ltd

【 摘 要 】

References(9)Cited-By(1)The oxygen-transfer efficiencies or bubble size distributions of polyurethane membrane diffusers are closely related to the physical properties of the membranes and the operating conditions. The factors affecting the bubble sizes and pressure losses of micro perforated polyurethane membrane diffusers were investigated. The Sauter mean diameter and bubble size distribution of a diffuser depended on the needle diameter and type of polyurethane membrane. The Sauter mean diameter of an H-90 membrane was 1.33 mm which was smaller than those for other types of membrane. The pressures drop across the membrane depended on the immersion period in water and increased with soaking time. Changes in the Young’s modulus after water soaking and the hardness of the membrane are assumed to cause the pressure drop across the membrane.

【 授权许可】

Unknown