Method and system for treatment of biological wastes for preparation of fertilizers

摘要

A method and system for treatment of biological wastes for preparation of fertilizers is provided. The method and system involves mixing a biological waste with a dilute sulfuric acid in a predetermined ratio. The mixture of the biological waste and the dilute sulfuric acid is then filtered to obtain an organic slurry and an acidic liquid. Thereafter, the organic slurry is thermally cracked at an elevated temperature to obtain at least one of an ammonia gas, one or more flue gases, and char and ash. The method and system further involves utilizing the ammonia gas, the char and ash, and the acidic liquid for preparation of the fertilizers.

主权项

1. A method of treating biological waste for preparation of fertilizers, the method comprising:
mixing the biological waste with a dilute sulfuric acid in a predetermined ratio; filtering the mixture of the biological waste and the dilute sulfuric acid to obtain an organic slurry and an acidic liquid; and thermally cracking the organic slurry at an elevated temperature to obtain at least one of an ammonia gas, at least one flue gas, and char and ash, wherein the ammonia gas, the acidic liquid and the char and ash are used for preparation of the fertilizers; passing the ammonia gas through the acidic liquid and at least one of an organic slurry washing liquid, a char and ash washing liquid, and a suspension liquid, wherein the organic slurry washing liquid is obtained by washing the organic slurry with water, wherein the char and ash washing liquid is obtained by washing the char and ash with a washing liquid, and the suspension liquid comprises water and lime; and drying a mixture of the acidic liquid and a liquid selected from the group consisting of the organic slurry washing liquid, the char and ash washing liquid, and the suspension liquid to obtain a powder, wherein the powder is used as a fertilizer.