Method used for preparing organic fertilizer from city domestic sludge

• Main Authors: XIE JIHONG, ZHAO HAIXIA, DE YING, MU HUAIBIN, HOU XIANGYANG
• Format: Patent
• Language: Chinese; English
• Published: 01.01.2014
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; FERTILISERS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MANUFACTURE THEREOF; METALLURGY; ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention belongs to the field of waste disposal and fertilizer production technology, and especially relates to a method used for preparing organic fertilizer from city domestic sludge. The method is capable of realizing effective processing and utilization of waste, and reducing pollution to the environment, energy consumption and cost. The method comprises following steps: 1) city domestic sludge, cow dung and smashed straw are prepared; 2) city domestic sludge, cow dung and smashed straw are mixed with a volume ratio of 12:7:1, and are stirred so as to obtain a mixture; 3) an aerobic fermentation decomposition agent and the mixture obtained in step 2) are delivered into an aerobic fermentation turnover machine for 10 to 15 days of aerobic fermentation, wherein the mass ratio of the aerobic fermentation decomposition agent to the mixture is 1:250; and 4) fermentation products obtained in step 3) are taken out from the aerobic fermentation turnover machine, and are smashed and sieved so as to obtain the