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김동호,이철민,Thanh-Tin Nguyen,Rusnang Syamsul Adha,김채연,Sang-Jun Ahn,손희종,김인수 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-
In recent years, pressure-assisted forward osmosis (PAFO) process has been studied to overcome the lowwater productivity in FO-RO hybrid seawater desalination. Our research group demonstrated a pilot-scalePAFO-RO plant for seawater desalination operations using secondary treated wastewater and naturalseawater. A pretreatment stage of mesh tubefilter media (MTF) and cartridgefilter (CF) was implementedfor a pilot-scale PAFO. In this study, the water quality and fouling index (SDI15 and MFI0.45) of the influentand treated water at each process stage of the plant were measured. For the influent of both wastewaterand seawater feature, it showed linear correlations between the concentration of microbial ATP (i.e., anindicator of microbial activity) and MFI0.45. After the PAFO was operated for 76 days, the fouling of thefiltration media and the FO membrane was also analyzed. The observation of the fouled membranes bySEM showed that fouling was hardly observed on the side contacting with seawater, but severe bacterialbiofilms were observed on the side contacting with wastewater. FT-IR results also confirmed protein-likesubstances on the membrane surface contacting with wastewater, indicating irreversible fouling. Thisstudy suggests that an advanced pretreatment process to remove bacteria and organic matter is essentialfor the protection of the FO membranes.
Asta Blazyte,Abayomi Babatunde Alayande,Thanh-Tin Nguyen,Rusnang Syamsul Adha,장재원,Mar Mar Aung,김인수 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
In the forward osmosis (FO) process, biofouling is well pronounced on the active side where wastewaterand seawater are used as feed and draw solution, respectively. However, the biofouling tendencies withinthe support layer are not clear. Therefore, the objective of this study was to investigate the effect of TEPpre-conditioning on hydophobicity and initial bacterial attachment of FO membrane support layer. Twostructurally distinct FO membranes from different manufacturers were preconditioned by soaking inartificial sea waterfiltrates containing size fractioned TEP. The conditioning solution pre-treated with a0.4 mm pore sizefilter, contributed to the highest bacterial adhesion rates during bacterial attachmenttesting in both steady state and cross-flow mode in a lab-scale FO system for both membrane types. CTA-ES support exhibited higher numbers of adhered bacteria when compared to PA-TFC support in a steadystate. Conversely, in cross-flow lab-scale testing, a negative impact of fouling on PA-TFC was moreapparent than the CTA-ES membrane. This was attributed to the higher porosity and surface roughness ofthe PA-TFC membrane. Overall, ourfindings reinforce the potential impact of hydrodynamics conditionsand membrane properties on the fouling behavior of FO membrane support layer.