| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a sewage sludge treating method, which is a technique comprising mixing dehydrated cake of sewage sludge with waste liquid to prepare circulation cake for pressurized feeding, pressure-feeding the circulation cake to store in a storage tank and using the circulation cake as e.g. a raw material for clinkers, allows reduction of the amounts of odorous gases, e.g., hydrogen sulfide and methyl mercaptan, generated from the circulation cake, even when the dehydrated cake is formed with an inorganic flocculant, controls expansion of the circulation cake during storage, produces no chlorine or heavy metals in the circulation cake and only requires low costs. <P>SOLUTION: The method has a step of mixing the dehydrated cake of sewage sludge stored in a container 2 of a truck 1 with waste liquid containing phenols in a mixing vessel 3 to obtain the circulation cake, a step of feeding the circulation cake to a storage tank 6 through a passage 5 for pressure feeding and a step of drying the circulation cake in the storage tank 6 and charging the circulation cake into a preheater 13 for use as a raw material for clinkers. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
