Subsurface wetland system capable of improving nitrogen and phosphorus removal effects of tail water in sewage plant and avoiding bioclogging
A technology for denitrification and phosphorus removal, subsurface wetlands, applied in water pollutants, biological treatment devices, sustainable biological treatment, etc., can solve the problems of insufficient effective carbon source and high nitrate content
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[0022] Improve the effect of denitrification and dephosphorization of sewage treatment plant tail water and avoid biological clogging of subsurface flow wetland system, its structure and such as Figure 1-2 As shown, it includes the water distribution area 2, the purification area 3 and the water collection area 4 arranged in sequence, the water distribution area 2 is connected to the water inlet pipe 1, the water collection area 4 is connected to the water outlet pipe 5, between the water distribution area 2 and the purification area 3, and the purification area 3 and the catchment area 4 are provided with perforated flower walls 8 for evenly distributing the water flow.
[0023] Sulfur / limestone mixed matrix 31 , gravel matrix 32 and zeolite matrix 33 are placed sequentially in the purification zone 3 according to the direction of water flow from front to back. The volume ratio of sulfur / limestone mixed matrix 31 , gravel matrix 32 and zeolite matrix 33 is 1:1:1.
[0024] W...
Embodiment 2
[0031] The experimental site is the green land on the outlet side of a sewage treatment plant, and a subsurface flow wetland system is constructed to treat the effluent of the sewage treatment plant, with a treated water volume of 2000m 3 / d, the main pollutants are nitrate, ammonia nitrogen and total phosphorus. The content of nitrate nitrogen in the influent was determined to be 6-10mg / L, the content of ammonia nitrogen was 0.3-5mg / L, and the content of total phosphorus was 0.32-0.48g / L. The design hydraulic retention time of the subsurface wetland is 12 hours, and the hydraulic retention time of the three sections are all set to 4 hours. Set up 2 groups of subsurface flow wetlands, the plane size of each group is 10x51m, and the depth is 1m;
[0032]Sulfur / limestone mixed matrix area, gravel matrix area and zeolite matrix area are set in subsurface wetland in stages, and perforated aeration tubes are set in the gravel medium area. The particle diameter of the sulfur / limes...
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