Industrial mariculture efflux water recycling and utilization system based on constructed wetlands, and method thereof

The present invention discloses an industrial mariculture efflux water recycling and utilization system based on constructed wetlands, and a method thereof. With the system and the method, two grades of constructed wetlands are connected in series to treat the mariculture efflux water, the sewage and the sludge are subjected to the harmless treatment, and are recycled and utilized. According to the present invention, the mariculture efflux water is pretreated by a sedimentation tank, and enters a first grade surface flow constructed wetland and a second grade upward vertical flow constructed wetland; the resulting water is subjected to a purification treatment, enters a water reservoir, and is reused; the sludge enters a sludge collecting tank from the sedimentation tank, and is treated by biological composting to be adopted for planting salt-tolerant vegetables; with the backwashing principle, the matrix clogging of the constructed wetlands is aperiodically recovered; compared to the mariculture efflux water treatment method in the prior art, with the method of the present invention, the denitrification and phosphorus removal effect is enhanced, the investment cost and the operating cost are low, the method has characteristics of high performance, ecology, environmental protection and economy, and is applicable for popularization and application.