Wastewater treatment system, construction method for wastewater treatment system, and wastewater treatment cylinder

A wastewater treatment system, comprising a foundation layer and a cylindrical wastewater treatment tank provided on the foundation layer, wherein

• the cylindrical wastewater treatment tank comprises a treatment space enclosed by a side wall;
• the treatment space is internally divided into three adjacent zones in sequence, wherein the three adjacent zones comprise an anaerobic zone, an anoxic zone, and an aerobic zone;
• each of the three adjacent zones runs vertically from a top of the cylindrical wastewater treatment tank to a bottom of the cylindrical wastewater treatment tank;
• and each two adjacent zones are communicated in sequence, such that wastewater in the cylindrical wastewater treatment tank flows through the anaerobic zone, the anoxic zone and the aerobic zone in sequence in a vertical serpentine path;
• a plurality of layers of process platforms are arranged in sequence from top to bottom around the cylindrical wastewater treatment tank above the foundation layer;
• and the plurality of layers of process platforms are configured to carry a plurality of secondary sedimentation devices and a plurality of advanced treatment devices for treating the wastewater discharged from the cylindrical wastewater treatment tank and to carry a power distribution device for maintaining an operation of the cylindrical wastewater treatment tank;
• at least two wastewater treatment cylinders are stacked above the foundation layer in sequence from bottom to top, thereby forming the cylindrical wastewater treatment tank,
• the wastewater treatment tank is provided with openings at both upper and lower ends, wherein a lower end of an outer wall of the wastewater treatment tank is provided with a plurality of guide rails, and the plurality of guide rails are uniformly arranged along a circumferential direction of the wastewater treatment tank and run in a vertical direction;
• and an upper end of the outer wall of the wastewater treatment tank is provided with a plurality of guide elements corresponding to the plurality of guide rails;
• each guide rail of the plurality of guide rails is connected to a U-shaped frame;
• an open end of the U-shaped frame is rotatably connected to two sides of the guide rail located in the circumferential direction of the wastewater treatment tank to form a rotation position;
• a closed end of the U-shaped frame rotates in the vertical direction around the rotation position;
• a lower end of each guide element of the plurality of guide elements is provided with a first sliding groove;
• the first sliding groove is configured to accommodate a locking element, wherein the locking element is movable along the first sliding groove between an initial position, a locking position and an unlocking position arranged in sequence from bottom to top;
• the locking element is connected to a top wall of the first sliding groove through a pre-compressed first elastic element;
• a bottom of the locking element extends out of the first sliding groove;
• the bottom of the locking element is provided with the locking position and a transition position, wherein the locking position and the transition position are connected in sequence in a direction from inside to outside;
• and the locking position is a curved surface protruding upward, and the transition position is a curved surface protruding downward.