Effects of anaerobic digestion on the combustion of sewage sludge

Around the world, especially in the developing countries, sludge management is a topic gaining increasing importance, as the number of treatment plants and the people connected to these plants are on the rise. Old approaches seeing sludge as a waste, including landfilling, leave its place for new applications where sludge acts as an energy source or a resource as fertilizer. Combustion or co-combustion of sludge exploits its energy potential while providing stabilization and reduction in volume. Besidescombustion, anaerobic digestion has been in use for a long time, serving to both stabilize the sludge and provide energy in terms of biogas. Anaerobic digestion is known to reduce the organic content of sludge, in turn, reducing its calorific value. The effects of anaerobic digestion enhanced by ultrasound pretreatment, on the combustion properties of sludge are demonstrated experimentally. 2.5 L anaerobic batch reactorswere used to quantify how the calorific value of the sludge changes with digestion time. On the average, over 71 days, methane production from the sonicated reactors was 8.6 L, 32% more than the control. Observed removals were 49% for VS and 38% for COD. Calorific values of the samples were reduced by 30% on the average. The ash content remained relatively the same.
8th International Conference on Environmental Science and Technology (June 06-10, 2016)


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Citation Formats
E. B. Çelebi, A. Aksoy, and F. D. Sanin, “Effects of anaerobic digestion on the combustion of sewage sludge,” Houston, Texas, USA, 2016, vol. 1, p. 111, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/74807.