Hybrid conditioning methods for dewatering stabilised sewage sludge

The search for methods and ways to intensify the fermentation process and, at the same time, the dehydration process, tends to move towards the use of various physical and chemical methods, as well as combinations of standalone methods. Based on research it was stated that combined methods (UD field + temperature) prior to the fermentation process contribute to a decrease the filtration capacity of the sludge (increase in capillary suction time and filtration resistance). In each case, the indicators in question were higher in relation to the values of sludge conditioned by stand-alone methods. The use of combined methods after the stabilisation process improved the filtration capacity. A reduction in CSK values, final hydration and resistance was observed with each day of the fermentation process. During the last days of stabilisation, the values of the sludge modified with combined methods were similar to those of the non-conditioned sludge. Hydration values were lowest on the last day of fermentation using an amplitude of 80% and a temperature of 80(degrees)C. This relationship was also observed by analysing the structure of the sludge.