PURPOSE: To restore the effective membrane area by disaggregating the hollow- fiber membranes and to secure a fixed permeation flux by specifying the suction pressure acting on the hollow-fiber membrane dipped in the waste water in a septic tank.
CONSTITUTION: A hollow-fiber membrane is dipped in the waste water in a septic tank to filter the waste water. In this case, the suction pressure acting on the membrane is controlled to ≤0.8kgf/cm2, and the membranes are disaggregated to restore the effective membrane area during filtration operation. The aggregation of the membranes depends on the suction pressure, filtration condition and physical properties of the liq. For example, when the air is diffused from below the membrane to fluidize the waste water on the membrane surface in filtration, the membranes are aggregated at about 0.4kgf/cm2 suction pressure when the amt. of the air diffused is small, however aggregation is not caused even at a higher pressure when more air is diffused, and aggregation tends to be caused at ≥0.8kgf/cm2 even if the liq. properties and filtration conditions are adjusted.
TAKEZAKI YOSHINORI
URYU KATSUJI
OKUNO YUICHI
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