期刊
ENVIRONMENTAL TECHNOLOGY
卷 36, 期 13, 页码 1605-1611出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2014.998717
关键词
bioreactor; aerobic granule; hydromechanics; hydraulic shear parameters; optimization
资金
- National Natural Science Foundation of China [51478416, 51008269]
- Public Projects of Zhejiang Province [2014C33017]
- Natural Science Foundation of Zhejiang province [LY13E080003]
The hydraulic shear acts as an important selection pressure in aerobic sludge granulation. The effects of the hydraulic shear rate and reactor configuration on structural characteristics of aerobic granule in view of the hydromechanics. The hydraulic shear analysis was proposed to overcome the limitation of using superficial gas velocity (SGV) to express the hydraulic shear stress. Results showed that the stronger hydraulic shear stress with SGV above 2.4 cm s(-1) promoted the microbial aggregation, and favoured the structural stability of the granular sludge. According to the hydraulic shear analysis, the total shear rate reached (0.56-2.31)x10(5) s(-1) in the granular reactor with a largerratio of height to diameter (H/D), and was higher than that in the reactor with smaller H/D, where the sequencing airlift bioreactor with smaller H/D had a high total shear rate under the same SGV. Results demonstrated that the granular reactor could provide a stronger hydraulic shear stress which promotes the formation and structural stability of aerobic granules.
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