How sludge characteristics and THP affect dewaterability

Proceedings

How sludge characteristics and THP affect dewaterability

Kjørlaug, O.¹, Rus, E.², Molokwu, O.², Nilsen, P.J.¹, ¹Cambi Group AS, Norway, ²Thames Water Innovation, UK
(free)

Abstract

Biosolids handling cost can be a significant part of the overall budget at a wastewater treatment plant.
An efficient dewatering is of importance for reducing the amount of water in the final biosolids product,
hence reducing the quantity of product that needs to be handled. Bound extracellular polymeric
substances (EPS) was assessed by microscopic evaluation and compared to dewatering
performance. Disturbance in anaerobic digestion (AD) performance showed an increase the
production of bound EPS, and a reduction in the amount of free water. Both factors lead to
deterioration of final dewatering performance. Digestion of hydrolysed raw sludge reduced the
dewatering potential compared to direct dewatering of hydrolysed raw sludge. Application of Post-AD
THP (PAD-THP) regained this potential, significantly improving dewaterability of the digestate.

Keywords
Dewatering, digestion, thermal hydrolysis

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