A multi-stage medical sewage sterilization device based on graphene nano technologies, characterized by comprising: a sewage discharge unit including sequentially a first-stage graphene nano composite grid, a second-stage graphene nano composite grid and a third-stage graphene nano composite grid along a water flow direction, wherein mesh numbers of the first, second and third-stage graphene nano composite grids are sequentially increased; a sterilization unit connected with the sewage discharge unit through a first-stage water valve, and medical sewage sequentially passes through the three stages of graphene nano composite grids and enters the sterilization unit; the sterilization unit sequentially includes a graphene photocatalytic sterilization tank, a graphene-modified diatom ceramic disinfection tank, an ultrasonic sterilization tank and a laser sterilization device along a water flow direction, and adjacent components are connected through a second-stage water valve, a third-stage water valve and a fourth-stage water valve; a wall of the graphene photocatalytic sterilization tank is made of transparent material, an inner wall of the graphene photocatalytic sterilization tank is provided with a graphene nano composite coating, and the interior of the graphene photocatalytic sterilization tank is filled with graphene photocatalytic sterilization agent; the graphene-modified diatom ceramic disinfection tank is internally provided with multiple layers of graphene-reinforced polymer screens each having a graphene-modified diatom ceramic composite material provided thereon; and the laser sterilization device includes a laser condensing cavity and a laser generator, a laser beam generated by the laser generator enters the laser condensing cavity, and a graphene near-infrared nano coating is provided on an inner wall of the laser condensing cavity.

A multi-stage medical sewage sterilization method based on graphene nano technologies, characterized in that the medical sewage is sequentially passed through three stages of graphene nano composite grids with an increasing mesh number to obtain a preliminary sterilized water body; and then the preliminary sterilized water body is sequentially subjected to graphene photocatalytic sterilization, graphene-modified diatom ceramic composite sterilization, ultrasonic sterilization, laser and near-infrared sterilization to obtain a final sterilized water body.

A multi-stage medical sewage sterilization device based on graphene nano technologies, characterized by comprising: a sewage discharge unit including sequentially a first-stage graphene nano composite grid, a second-stage graphene nano composite grid and a third-stage graphene nano composite grid along a water flow direction, wherein mesh numbers of the first, second and third-stage graphene nano composite grids are sequentially increased; a sterilization unit connected with the sewage discharge unit through a first-stage water valve, and medical sewage sequentially passes through the three stages of graphene nano composite grids and enters the sterilization unit; the sterilization unit sequentially includes a graphene photocatalytic sterilization tank, a graphene-modified diatom ceramic disinfection tank, an ultrasonic sterilization tank and a laser sterilization device along a water flow direction, and adjacent components are connected through a second-stage water valve, a third-stage water valve and a fourth-stage water valve; a wall of the graphene photocatalytic sterilization tank is made of transparent material, an inner wall of the graphene photocatalytic sterilization tank is provided with a graphene nano composite coating, and the interior of the graphene photocatalytic sterilization tank is filled with graphene photocatalytic sterilization agent; the graphene-modified diatom ceramic disinfection tank is internally provided with multiple layers of graphene-reinforced polymer screens each having a graphene-modified diatom ceramic composite material provided thereon; and the laser sterilization device includes a laser condensing cavity and a laser generator, a laser beam generated by the laser generator enters the laser condensing cavity, and a graphene near-infrared nano coating is provided on an inner wall of the laser condensing cavity.

A multi-stage medical sewage sterilization method based on graphene nano technologies, characterized in that the medical sewage is sequentially passed through three stages of graphene nano composite grids with an increasing mesh number to obtain a preliminary sterilized water body; and then the preliminary sterilized water body is sequentially subjected to graphene photocatalytic sterilization, graphene-modified diatom ceramic composite sterilization, ultrasonic sterilization, laser and near-infrared sterilization to obtain a final sterilized water body.

A multi-stage medical sewage sterilization device based on graphene nano technologies, characterized by comprising: a sewage discharge unit including sequentially a first-stage graphene nano composite grid, a second-stage graphene nano composite grid and a third-stage graphene nano composite grid along a water flow direction, wherein mesh numbers of the first, second and third-stage graphene nano composite grids are sequentially increased; a sterilization unit connected with the sewage discharge unit through a first-stage water valve, and medical sewage sequentially passes through the three stages of graphene nano composite grids and enters the sterilization unit; the sterilization unit sequentially includes a graphene photocatalytic sterilization tank, a graphene-modified diatom ceramic disinfection tank, an ultrasonic sterilization tank and a laser sterilization device along a water flow direction, and adjacent components are connected through a second-stage water valve, a third-stage water valve and a fourth-stage water valve; a wall of the graphene photocatalytic sterilization tank is made of transparent material, an inner wall of the graphene photocatalytic sterilization tank is provided with a graphene nano composite coating, and the interior of the graphene photocatalytic sterilization tank is filled with graphene photocatalytic sterilization agent; the graphene-modified diatom ceramic disinfection tank is internally provided with multiple layers of graphene-reinforced polymer screens each having a graphene-modified diatom ceramic composite material provided thereon; and the laser sterilization device includes a laser condensing cavity and a laser generator, a laser beam generated by the laser generator enters the laser condensing cavity, and a graphene near-infrared nano coating is provided on an inner wall of the laser condensing cavity.

A multi-stage medical sewage sterilization method based on graphene nano technologies, characterized in that the medical sewage is sequentially passed through three stages of graphene nano composite grids with an increasing mesh number to obtain a preliminary sterilized water body; and then the preliminary sterilized water body is sequentially subjected to graphene photocatalytic sterilization, graphene-modified diatom ceramic composite sterilization, ultrasonic sterilization, laser and near-infrared sterilization to obtain a final sterilized water body.

A multi-stage medical sewage sterilization device based on graphene nano technologies, characterized by comprising: a sewage discharge unit including sequentially a first-stage graphene nano composite grid, a second-stage graphene nano composite grid and a third-stage graphene nano composite grid along a water flow direction, wherein mesh numbers of the first, second and third-stage graphene nano composite grids are sequentially increased; a sterilization unit connected with the sewage discharge unit through a first-stage water valve, and medical sewage sequentially passes through the three stages of graphene nano composite grids and enters the sterilization unit; the sterilization unit sequentially includes a graphene photocatalytic sterilization tank, a graphene-modified diatom ceramic disinfection tank, an ultrasonic sterilization tank and a laser sterilization device along a water flow direction, and adjacent components are connected through a second-stage water valve, a third-stage water valve and a fourth-stage water valve; a wall of the graphene photocatalytic sterilization tank is made of transparent material, an inner wall of the graphene photocatalytic sterilization tank is provided with a graphene nano composite coating, and the interior of the graphene photocatalytic sterilization tank is filled with graphene photocatalytic sterilization agent; the graphene-modified diatom ceramic disinfection tank is internally provided with multiple layers of graphene-reinforced polymer screens each having a graphene-modified diatom ceramic composite material provided thereon; and the laser sterilization device includes a laser condensing cavity and a laser generator, a laser beam generated by the laser generator enters the laser condensing cavity, and a graphene near-infrared nano coating is provided on an inner wall of the laser condensing cavity.

A multi-stage medical sewage sterilization method based on graphene nano technologies, characterized in that the medical sewage is sequentially passed through three stages of graphene nano composite grids with an increasing mesh number to obtain a preliminary sterilized water body; and then the preliminary sterilized water body is sequentially subjected to graphene photocatalytic sterilization, graphene-modified diatom ceramic composite sterilization, ultrasonic sterilization, laser and near-infrared sterilization to obtain a final sterilized water body.