The Influence of Hydraulic Conditions on Characteristics of Granular Sludge and EPS in MBR
The characteristics of sludge and the variation of EPS content under different hydraulic conditions are investigated using flocculent sludge and granular sludge during the operation of MBR process(labeled as reactors A and B respectively).The results indicate that granular sludge has a more significant response to changes in hydraulic conditions in the system compared to flocculent sludge.When the stirring intensity increases from 40 r/min to 160 r/min,the SVI of the granular sludge shows a trend of first decreasing and then increasing with the change of hydraulic conditions.When the SVI decreases to 48.4 mL/g,the integri-ty coefficient shows an increasing trend.When the rotational speed increases from 40 r/min to 100 r/min,the particle size of the granular sludge ranges from 200 to 400 μm,and the volume percentage increases from 36％ to 48％.The proportion of other particle sizes do not change significantly.The Zeta potential in the mixed solution is negatively correlated with the protein content,and the Zeta potential decreases with the increasing stirring intensity,mainly due to the increase of protein content in the system.There is a sig-nificant difference in the composition of EPS inside the two reactors.Using different stirring intensities,the aver-age protein content in EPS of granular sludge is 67.6％,while that of the flocculent sludge is only 39.1％.
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