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Physical characteristics of conditioned anaerobic digested sludge-A fractal, transient and dynamic rheological viewpoint

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Journal of Environmental Sciences 2011年第8期23卷 1266-1273页

作者： Yili Wang Emilie Dieude-Fauvel Steven K Dentel College of Environmental Science and Engineering Beijing Forestry University Beijing 100083 China. Department of Civil and Environmental Engineering University of Delaware Newark Delaware 19711 USA Cemagref Les Palaquins 03150 Montoldre Paris France

The changes in the physical characteristics of unconditioned and conditioned anaerobic digested sludge （ADS） biosolids, such as capillary suction time （CST）, yield stress, average size and fractal dimensions, were investigated through a CST test, transient and dynamic rheological test and image analysis. The results showed that the optimum polymer dose range was observed when CST or its reciprocal value was employed as an indicator. There were good correlations between the yield stresses determined from both a controlled shear stress test and a strain amplitude sweep test. The yield stress and storage modulus （G＇） increased as the polymer dose increased in most cases. A frequency sweep test revealed that polymer conditioning could extend the frequency sweep ranges for their elastic behaviors over viscous behaviors as well as the gel-like structure in the linear viscoelastic range. These results implied that more deformation energy was stored in this rigid structure, and that elastic behavior became increasingly dominant with the addition of the polymer in most cases, In addition, both the average sizes and two-dimensional fractal dimensions for conditioned ADS biosolids presented a similar up-climax-down variation trend as the polymer doses increased, whereas the critical polymer doses at the highest average sizes or two-dimensional fractal dimensions, were different. Correlation analysis revealed that the conditioned ADS dewaterability was not correlated with the yield stresses, while the average sizes or the two-dimensional fractal dimensions for conditioned ADS biosolids could be taken as the indication parameters for ADS dewaterability.

关键词： anaerobic digested sludge conditioning dynamic oscillatory test yield stress fractal dimensions polymer dose

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