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Mechanical Sewage Sludge Disintegration - a reliable method to increase the efficiency of sewage treatment plants

Kolb F.

Zeszyty Naukowe. Inżynieria Środowiska / Politechnika Opolska

2003

Vol. 291, z. 4

157-175

The disintegration of sewage sludge, i. e. the destruction of the sludge floe and the subsequent releasing of its cellular components, may in the treatment of wastewater be utilized for a higher process stability and an increased gas development during anaerobic sludge stabilization (Dichtl et al., 1997). The various disintegration processes do not only differ in their effective mechanisms, but in their energy demand as well Mechanical disintegration by means of a LAVAL nozzle as applied in the CROWN-system is a particularly favourable method due to its low energy demand for the digestion of biomass, at the same time offering high operation reliability and low maintenance efforts. This innovative and compact process is appropriate for the treatment of all municipal sludges so that during digestion times of 15 days with surplus sludge the gas output can be increased by at least 30% and the organic dry solid matter can be reduced by approx. 20%. Due to its compact structure the process can be integrated in every stage of the purification, thus enabling for instance a specific treatment of digested or floating sludge in order to eliminate filamentous microorganisms (Muller et al., 1999). With this treatment step it is possible to minimize foaming of digesters or even to eliminate foaming completely. The utilization of standardized components and the choice of an appropriate location for disintegration lead to short periods for the return of investment" and in a reduction of operating expenses.