System and method for preparing organic nutrient soil from urban domestic sludge, organic nutrient soil and application

The invention belongs to the technical field of urban domestic sludge resource utilization and soil fertilizer, and particularly relates to a system and method for preparing organic nutrient soil fromurban domestic sludge, the organic nutrient soil and application. The system comprises a pretreatment unit, a high-temperature and high-pressure reaction unit, a decomposition and energy recovery unit, an organic nutrient soil extraction unit, an organic nutrient soil shaping unit and a central monitoring and regulating unit used for controlling all the units to operate. The sludge treatment process can be carried out through automatic equipment, the central monitoring and regulating unit monitors and regulates operating parameters of all the units through a human-computer interface, an operator does not make direct contact with sludge, and the operating condition is convenient to check and adjust. The problems that in a traditional mode, the automation level is low, the industrial operation degree is not high, t