| 摘要 |
<p>It is proposed for the treatment of sewage sludge in the sense of recycling that the dried sewage sludge is subjected in a fractional pyrolysis initially to a low-temperature conversion under anaerobic conditions around 300 DEG C to remove the organic carbon in the form of oil and then to incinerate the remaining carbon with input of pure oxygen at a temperature above 1,250 DEG C. This leads to a sintering of the inorganic constituents of the sewage sludge comparable to that employed for producing cement. The inorganic material obtained by sintering has a composition similar to that of cement so that it can be used, similar to blast furnace slag for example, as additive to Portland cement for use in concrete. The process according to the invention makes it possible, by sensible utilisation of the high energy content of sewage sludge and despite the high energy requirement, for operation to be substantially energy- autarchic i.e. substantially independent of supply of energy from outside.</p> |
