Table of Contents
2. HEAT DRYING Heat drying is probably the most convenient method for treatment and sludge volume reduction. The dewatered cake from the belt press is transported via a conveyor/auger and loaded into the dryer that in turn heats the sludge cake to evaporate the moisture.
These systems use the weight and thixatropic qualities of the sludge cake to establish and control the flow of sludge cake into the trucks from the storage hoppers. Metering is accomplished by hydraulically operated MSE Diamond Seal slide gates that control the flow to the trucks as a function of weight.
Six trucks were required to handle the sludge cake volume of 115 cubic yards a day, and loadout could take up to two hours or more, as the trucks had to be moved periodically to ensure they were loaded evenly.
Looking at Table 1 we can see a 0.5 mgd plant will produce 21,210 lbs per week of sludge cake for disposal following dewatering to 16% solids. By going to the next stage and storing and turning the sludge for a period of time we bring the solids up to the 56% range and get a further 70% reduction in volume.
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