Method and device for preventing and controlling pollutants in basin water resource utilization

A device for preventing and controlling pollutants in reuse of reclamation process-treated water previously collected from a prior use in a liquid-holding container, wherein the device includes a hydrolysis tank (1), a nano-aeration tank (2) and a subsurface flow constructed wetland (3) connected in sequence, which are 4˜10 m far from basin revetment;

• in the hydrolysis tank (1), aquatic plants are crushed, acidized and digested, and then the supernatant is transported into the nano-aeration tank (2);
• in the nano-aeration tank (2), the supernatant from the hydrolysis tank (1) is received, and organic matters in the supernatant are degraded, such as long carbon chain organic matters are degraded into short carbon chain organic matters, thereafter the degraded supernatant is fed into the subsurface flow constructed wetland (3) to provide microorganisms with carbon source;
• in the subsurface flow constructed wetland (3), the supernatant from the nano-aeration tank (2) is mixed with the reclamation process-treated water, and then is fed into one or more layers of fillers laid in the subsurface flow constructed wetland (3), where pollutions are degraded or removed to yield a treated reclamation process-treated water, and the treated reclamation process-treated water is transported to the farmland.