Process and apparatus for obtaining nitrogen fertilizer from organic waste products

摘要

A process for the recovery of nitrogen fertilizer from organic waste products in the liquid phase and for the sanitation of waste and emission reduction by thermal treatment using mineral additives, wherein the waste product at reduced pressure to temperatures between 40 ° and 90 ° C, the escaping and carbon dioxide and Cooled ammonia-containing gas and introduced into a mineral-aqueous suspension or brought into contact with it, the resulting nitrogen fertilizer discharged and the unabsorbed and carbon dioxide-containing excess gas recirculated and the negative pressure generated at the beginning of the process by a vacuum pump through the course of the process is autogenously maintained, according to patent DE 103 54 063 C5, characterized in that the unabsorbed and carbon dioxide-containing excess gas is recycled to the circuit by either - directly above the treated Waste product - via a gas cooling system above the waste product to be treated or - divided and a partial flow is introduced through the waste product and another partial flow above the waste product.