Cementing material embedded microorganism composite fixed aggregate as well as preparation method and application thereof

The invention relates to the technical field of building material preparation, and discloses a cementitious material embedded microorganism composite fixed aggregate and a preparation method and application thereof.The preparation method comprises the steps that phosphogypsum-based lightweight aggregate is soaked in carbonate mineralization bacterium liquid and dried, and then phosphogypsum-based lightweight aggregate embedded with microorganisms is obtained; soaking the microorganism-embedded phosphogypsum-based lightweight aggregate in a cementing liquid, and drying to obtain an improved microorganism-embedded phosphogypsum-based lightweight aggregate; and putting the improved phosphogypsum-based lightweight aggregate embedded with microorganisms into the cementing material slurry, and then performing CO2 curing, thereby obtaining the phosphogypsum-based lightweight aggregate embedded with microorganisms, the cementing material is at least one of magnesium phosphate cement, magnesium oxide, low-alkalinity s