Membrane process for industrial waste water reclamation

• Main Authors: Yung-Hsin Chang, 張永信
• Other Authors: Hsuan-Hsien Yeh
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/77239993307723474246

碩士 === 國立成功大學 === 環境工程學系碩博士班 === 96 === The objective of this research is to study the feasibility of treating the effluent from the wastewater treatment plant（WTP）of an industrial park for reuse. First, coagulation, with or without UF, followed by reverse osmosis（RO）were used to treat the effluent. The permeate quality and the flux decline of the RO system were monitored. Then sequential filtration by combining various kind of ultrafiltration（UF）membrane were used to test the coagulated effluent, in order to evaluate the characteristics of the major foulants. The results show that the water quality of RO permeate was excellent, and can be easily used as process water supplement. However, as the fouling potential of the WTP effluent was quite high, the smooth operation of the RO system will depend on successful fouling control. Coagulation followed by UF could significantly reduce the Silt Density Index（SDI） value, and, therefore, are the feasible pretreatment process for RO. In the study of coagulation for UF fouling control, alum was found to be superior to ferric chloride. The alum treated water generated high flux for the UF than ferric chloride, as the former removed more colloidal and particulate matters. Further, based on sequential filtration by various UF membrane, the size of the major foulants for 10 kDa regenerated cellulose UF membrane was found to be between 100 kDa（20 nm）to 1μm. Based on Hermia's model, the major fouling mechanisms for 10 kDa and 100 kDa UF membranes were found to be cake formation on the membrane surface, and particles deposition on pore walls, respectively.