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Effect of Periodic $N_2$-back-flushing in Paper wastewater Treatment using Carbon Ceramic Ultrafiltration and Microfiltration Membranes  

황현정 (한림대학교 생명과학부 환경시스템공학 전공)
박진용 (한림대학교 생명과학부 환경시스템공학 전공)
Publication Information
Membrane Journal / v.12, no.1, 2002 , pp. 8-20 More about this Journal
Abstract
In this study using $N_2$-back flushing, which wwas not the general back-flushing method of membranes, the discharged wastewater from a paper plant was filtrated by 4 kinds of tubular carbon ceramic ultrafiltration membranes. We could in vestigate effects of $N_2$-back flushing period, transmembrane pressure (TMP)and flow rate and find optimal operating conditions. The $N_2$-back flushing time (BT) was fixed at 40 sec, filtration times (FT) were changed in 4~32 min, TNP in $1.0~3.0kg_f/cm^2$ the flow celocities in 0.53~1.09cm/s. The optimal conditions were discussed in the viewpoints of dimensionless permeate flux ($J/J_0$), toal permeate volume ($V_T$) and resistance of membrane fouling ($R_f$). Optimal back-flushing period was BT/FT=0.167 (FT=8 min ), in which more $V_T$ was obtained than that in BT/FT=0.083 (FT=4 min) which was the most friquent back-flushing condition. Then rising TMP should increase the driving force, and more $V_T$ could be accumulated. And rising flow rate should decrease membrane fouling increase permeate flux, and more $V_T$could be produced. Average rejection rates of pollutants were higher than 95% for turbidity and 45~83% for $COD_{Cr}$, but rejection rates of total dissolved solid (TDS) were lower than 10%.
Keywords
nitrogen-back-flushing; paper wastewater; ceramic membrane; ultrafiltration;
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Times Cited By KSCI : 2  (Citation Analysis)
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