| 摘要 |
An improved process for the low-cost disposal of noxious municipal sewage sludge in a safe way without polluting the environment. In the process, a portion of a stream of dewatered sewage sludge having a solids content in the range of about 17 to 40 wt.% is dried to produce dried sewage sludge having a solids content in the range of about 75 to 99 wt.%. The dried sewage sludge is ground to a small particle size. A pumpable aqueous feed slurry having a solids content in the range of about 45 to 70 wt.% is produced comprising (a) solid carbonaceous fuel, (b) ground dried sewage sludge, and (c) sheared and/or unsheared dewatered sewage sludge. The parts by weight of (a):(b):(c) are respectively in the range of about 3 to 8:0.5 to 2:0.5 to 2, and preferably 6:1:1. The aqueous feed slurry is gasified in a free-flow partial oxidation gas generator. Synthesis gas, reducing gas or fuel gas is produced, Ash and slag are separated from the gas stream and safely disposed. Waste heat produced in the process may be used to dry the sewage sludge.
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