Combined Effect of Reversible Flocculation and Ultrahigh Pressure in High-Level Deliquoring Attained by Expression of Activated Sludge

We attempted a dewatering operation using the osmotic pressure of activated sludge with high moisture content, which is discharged in large quantities from a sewage treatment facility, and elucidated its dewatering e ect. A lter cake with a moisture content of approximately 80 wt% prepared by ltration of activated sludge was immersed in a high-concentration salt solution. e intracellular water was discharged owing to the osmotic pressure di erence between the inside and outside of the microbial cells constituting the activated sludge, whereby a low moisture-content dewatered cake was obtained. e higher the osmotic pressure, the greater was the dewatering e ect. With an osmotic pressure of approximately 22 MPa, the moisture content of the cake decreased to approximately 60 wt% within a few minutes. is value of moisture content could not be reached even if the cake was consolidated by ltration at a pressure of 500 kPa, and it took approximately 370 min to reduce the moisture content from 80 wt% to 70 wt%. erefore, it was observed that high-speed and high-level dewatering of activated sludge could be realized using osmotic pressure.e e ect of osmotic dewatering was also con rmed for sludge occulated with an organic polymer occulant, which was applied to shorten the ltration time. Compared to non-occulated sludge, although the moisture content tended to hardly decrease, a dewatered cake with a moisture content of approximately 66 wt% was obtained. e sludge cake dehydrated by osmotic pressure had an extremely low moisture content, suggesting the possibility of use as a solid fuel.

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Combined Effect of Reversible Flocculation and Ultrahigh Pressure in High-Level Deliquoring Attained by Expression of Activated Sludge

Cited by 3 publications

References 29 publications

Ultrahigh-pressure expression of activated sludge assisted with self-flocculation caused by ultrasonication

Ultrahigh-pressure expression of activated sludge assisted with self-flocculation caused by ultrasonication

High-Level Dewatering of White-Rot Fungi by High-Pressure Expression and Characterization of Physiologically Active Substances

High-Level Dewatering of Activated Sludge Using Osmotic Pressure

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