The utility model discloses a multi-stage composite
constructed wetland coupled ecological floating
bed system, which belongs to the technical field of
water pollution control and ecological restoration, and comprises a pretreatment unit, a multi-stage
constructed wetland module and an ecological floating
bed module, the multi-stage
constructed wetland module respectively adopts
zeolite,
charcoal and
oyster shell filler, and combines with reed,
acorus calamus and other plants, and the ecological floating
bed module is connected with the pretreatment unit. Suspended matters, COD (
Chemical Oxygen Demand),
ammonia nitrogen and
total phosphorus are removed in a grading manner; the ecological floating bed module is arranged in a final-stage
wetland water outlet area, cress and
thalia dealbata are planted by adopting a modified
polyethylene frame, and a load biological
rope is suspended below the ecological floating bed module.
Oyster shell filler chemical
phosphorus removal, three-stage
wetland-floating bed feedback
coupling nitrogen removal and anti-blocking grading design are innovatively introduced, the
effluent standard that COD is smaller than or equal to 30 mg / L,
ammonia nitrogen is smaller than or equal to 2 mg / L and
total phosphorus is smaller than or equal to 0.5 mg / L is achieved, and meanwhile the operation and maintenance cost is reduced through economic
crop planting. The
system has high efficiency, long-
term effect and resource benefit, and is suitable for treatment of domestic
sewage, agricultural non-
point source and river
eutrophication water.