A fluidized-pellet-bed separator with movable sludge hoppers was applied in pilot scale for the separation and thickening of activated sludge mixture liquid. Under the condition of suspension SS around 4,000 mg/L, polymer (CJX103, cationic, MW 5 × 106) dose at a dry solid ratio of 0.003 and upward flow rate at 5.4 m/hr, the fluidized pellet bed performed solid/liquid separation and sludge thickening well. The SS concentration of the treated water was about 5 mg/L on average and the moisture content of the sludge after screening for 5 min was less than 94%, which is much lower than that after conventional settling and thickening and easy to be finally disposed. At a higher upward flow rate of 7.2 m/hr, similar results could also be obtained but higher polymer dose (solid ratio of 0.004) was required. The morphological characteristics and density-size relationship of the granular particles formed in the fluidized pellet bed were also investigated by image analysis and settling velocity measurement of individual particles. The two-dimensional fractal dimension was evaluated to be 1.6-1.8, showing a good quasi-spherical morphology of the granular particles with their density much higher than the conventional flocs. The results of the pilot study indicate a possible way to innovate the conventional secondary settling and gravitational thickening processes for solid/liquid separation and sludge handling, especially for small scale wastewater treatment plants to reach the goal of space saving and higher treatment efficiency.
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Research Article|
May 01 2004
Pilot study of a fluidized-pellet-bed technique for simultaneous solid/liquid separation and sludge thickening in a sewage treatment plant
X.C. Wang;
*School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No 13 Yanta Road, Xi'an 710055, China (E-mail: xcwang@chinawestwater.net; pkjin@chinawestwater.net; hlyuan@chinawestwater.net)
E-mail: xcwang@chinawestwater.net
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P.K. Jin;
P.K. Jin
*School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No 13 Yanta Road, Xi'an 710055, China (E-mail: xcwang@chinawestwater.net; pkjin@chinawestwater.net; hlyuan@chinawestwater.net)
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H.L. Yuan;
H.L. Yuan
*School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No 13 Yanta Road, Xi'an 710055, China (E-mail: xcwang@chinawestwater.net; pkjin@chinawestwater.net; hlyuan@chinawestwater.net)
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E.R. Wang;
E.R. Wang
**Beishiqiao Wastewater Purification Center, No 368 Kunming Road, Xi'an 710003, China (E-mail: xabsqwtc@public.xa.sn.cn)
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N. Tambo
N. Tambo
***The University of the Air, 2-11, Wakaba, Mihama-Ku, Chiba 264-8586, Japan (E-mail: tambo@u-air.ac.jp)
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Water Sci Technol (2004) 49 (10): 81–88.
Citation
X.C. Wang, P.K. Jin, H.L. Yuan, E.R. Wang, N. Tambo; Pilot study of a fluidized-pellet-bed technique for simultaneous solid/liquid separation and sludge thickening in a sewage treatment plant. Water Sci Technol 1 May 2004; 49 (10): 81–88. doi: https://doi.org/10.2166/wst.2004.0614
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