From the viewpoint of environmental and energy problems, it is desirable that the organic and inorganic components of sewage sludge can be reused cost-effectively. A process is described which can meet this need. The process was investigated in a large-scale industrial trial, involving the pelletizing-drying of sewage sludge, combined with burning in a Portland cement kiln. Special attention was paid to product quality; plant safety; simple operation and maintenance; ability to process different sludge and water contents; and low consumption of energy. There were no odour and dust emissions. The study demonstrated that dried sewage sludge pellets could gainfully be used by Portland cement manufacturer.
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© IWA Publishing 2000
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