Abstract
The relationship between rheological properties and the hydrolysis rate in anaerobic digestion (AD) is poorly understood. This study investigated AD of waste-activated sludge (WAS) in batch digesters of 2.10%, 3.40%, 4.10%, and 5.02%TS digester media (WAS mixed with inoculum). The digesters operated below ammonia inhibition levels and at the same food to inoculum (F/I) ratios, temperature, and mixing. The results indicated that a decrease in the hydrolysis rate was associated with an increase in yield stress, the flow consistency index, and viscoelastic moduli. In addition, the statistical analysis revealed the linear relationships between changes in the flow consistency index and hydrolysis rate as well as the efficiency of organic matter removal, regardless of the types and origin of sludge, the F/I ratio, and the seasons when sampling occurred. A linear relationship between yield stress and dewaterability was also revealed. These findings indicate that the flow consistency index measurement could be a reliable method for monitoring the hydrolysis stage and organic matter removal in anaerobic digesters.
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