| 摘要 |
A process is proposed for treating and utilising biomasses and biogenic sludges such as sewage sludge. The invention addresses the problem of designing a simple and low-energy process for treating sewage and other biological sludges which requires no heating and results in a product with low water content and high mechanical strength and fertiliser value. The product must also be odourless, storable, pourable and easy to dispense in measured amounts in order to be of direct use in agriculture, and possess long-term fertilising properties. The problem is solved by a process for the production of fertilisers and soil improvers from sewage sludge: sewage sludge which has already undergone dewatering is mixed with a laminar silicate binder which can swell and fine to coarse grained rock-, aerated concrete- or wood dust. The mixture is then mixed thoroughly in a high-pressure-agglomeration device with rollers and forced through pressing channels with a release of frictional energy to produce temperatures of over 100 DEG C; the product is then hygienized and an organic-inorganic structural matrix is formed. Subsequent drying is unnecessary. |
