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It's still unclear whether the sludge settleability would be affected by the molecule-sizes of carbohydrates. In order to reveal this correlations, long term effects of influent carbohydrates with different molecule-size on sludge settleability were investigated in this study. Three lab-scale sequencing batch reactors were operated by using particulate starch, soluble starch and glucose as the solo carbon source, respectively. The smaller the carbohydrate molecule-size was, the more sensitive the activated sludge was with the environment changing. Therefore, the system would be more easily to suffer with bulking problems when feeding with micro-molecule carbohydrate. The adsorbed particulate carbohydrate would highly increase the sludge settleability in the polymeric carbohydrate-fed system. The SVI was kept lower than 150 mL/g in the glucose-fed system although the PHA production was only about 0.6 mmol C/L. The carbohydrate to protein (C/P) ratio of the extracellular polymeric substances showed positive correlation with SVI. The C/P value increased from 0.248 to 1.201 while the SVI increased from 100to 600mL/g. The dominant filamentous bacteria of the particulate starch-, soluble starch- and glucose-fed system were Type 0041, M. parvicella and S. natans, respectively. Finally, the phosphorous removal efficiency could reach to 80% with glucose as the sole carbon source. ©, 2015, Chinese Society for Environmental Sciences. All right reserved.
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China Environmental Science
ISSN: 1000-6923
Year: 2015
Issue: 2
Volume: 35
Page: 448-456
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 1