MABR-based method for treating rare earth mine tailwater

A membrane aeration bioreactor (MABR)-based method for treating rare earth mine tailwater, comprising:

• introducing a rare earth mine tailwater into a sedimentation pond and simultaneously injecting pig farm breeding tailwater into the sedimentation pond, wherein a volume ratio of the rare earth mine tailwater to the pig farm breeding tailwater is 5 to 30:1;
• and fully mixing the rare earth mine tailwater to the pig farm breeding tailwater in the sedimentation pond for solid particulate sedimentation;
• overflowing the rare earth mine tailwater after solid particulate sedimentation from the sedimentation pond to a conditioning tank, and adding a pH adjusting agent to the conditioning tank to adjust a pH of the rare earth mine tailwater after solid particulate sedimentation to 6.5 to 7.0;
• delivering the rare earth mine tailwater after pH adjustment to a membrane aeration bioreactor for MABR enhancement treatment;
• wherein the membrane aeration bioreactor comprises a rectangular pool body, an inner wall of the rectangular pool body is covered with a geomembrane impermeable layer, a membrane assembly is fixed in the rectangular pool body, and air is supplied to the membrane assembly through a main air delivery pipe, causing the membrane assembly to carry out microporous aeration and provide an attachment environment for microorganisms in the membrane aeration bioreactor;
• overflowing the rare earth mine tailwater after MABR enhancement treatment to a percolation dam for percolation treatment;
• overflowing the rare earth mine tailwater after percolation treatment to an ecological purification pond for ecological purification;
• wherein the ecological purification pond comprises a soil pond, an inner wall of the soil pond is covered with another geomembrane impermeable layer, the another geomembrane impermeable layer is covered with a common soil layer, and submerged plants and emergent plants are planted on the common soil layer;
• and
• overflowing and discharging the rare earth mine tailwater purified by the ecological purification pond to a natural water body.