Tailing sand biological cemented filling method and system based on bacterium source urease

The invention discloses a bacterial source urease-based tailing sand biological cemented filling method and system, bacterial source urease with high activity, good fluidity and no biological safety risk is extracted from urease-producing microorganisms, and the urease is used for cementing tailing sand filled in a goaf, so that the strength of a goaf filling body can be improved. Meanwhile, in order to improve the utilization and cementation efficiency of the tailing sand, the tailing sand is screened according to different particle size ranges, and a mixing method and a permeation grouting method are adopted for filling. The treating fluid prepared on the basis of the bacterial urease has the advantages of being good in fluidity, high in biological safety level, environmentally friendly and the like, and the weak stability problem that a filling body mainly made of cement is difficult to repair or even cannot be repaired after being cracked is solved. Meanwhile, the scheme provided by the invention can play