A Constructed Wetland System for Strengthening Nitrogen and Phosphorus Removal

Abstract

The invention discloses an artificial wetland system with strengthened denitrification and dephosphorization, which consists of three parts: a regulation and hydrolysis tank, a water dripping oxygenator and an artificial wetland. The regulation and hydrolysis tank is arranged on the front part, an artificial wetland tank is arranged on the rear part, and the water dripping oxygenator is arranged on the joint of a water outlet of the regulation and hydrolysis tank and the artificial wetland tank. During the operation, sewage enters the regulation and hydrolysis tank for anoxic hydrolysis first, flows to the water dripping oxygenator for natural oxygenation after the treatment, and then enters the artificial wetland to remove organic matters through wetland fillers and plants and then is drained. The system uses lightweight concrete to process into an intermediate-layer filler of the artificial wetland, and upper-layer filler is gravel and lower-layer filler is pebble in the artificial wetland; compositions of the wetland plants orderly are canna, reed and herb of glomerate galingale; and the water dripping oxygenator uses three-dimensional elastic filler. Through the treatment of the system, the removal rate of COD, ammonia nitrogen and TP of the sewage can reach more than 85 percent; and the system has stable treatment effect and does not need power in winter.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and relates to an artificial wetland treatment system for strengthening nitrogen and phosphorus removal. Background technique [0002] The domestic sewage discharged by rural residents mainly includes fecal sewage, washing, bathing and kitchen wastewater, etc. Most of the domestic sewage in rural areas is discharged directly without treatment, causing serious pollution of water bodies and eutrophication of lakes and reservoirs, which poses a threat to water source protection. Come a lot of pressure. [0003] The constructed wetland technology with aquatic plants as the main body has developed rapidly in recent years due to its advantages of simplicity and low investment. However, it has become a consensus that the removal effect of nitrogen and phosphorus in constructed wetlands is poor. Research by Ma Lishan and others found that vetiver is a kind of amphibious plant that is highly enr...

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Problems solved by technology

However, it has become a consensus that the removal effect of nitrogen and phosphorus in constructed wetlands is poor

Research by Ma Lishan and others found that vetiver is a kind of amphibious plant that is highly enriched in nitrogen and phosphorus. It can greatly remove nitrogen and phosphorus through root absorption. At the same time, it can be used as feed, and it has economic value while repairing the polluted water environment. ; Tang Zhijian and other studies found that the Chinese toon grass, cress, and water glory grass made of floating beds have obvious effects on removing nitrogen and phosphorus in water bodies and inhibiting the growth of algae, but these studies focus on their principles and different aquatic organisms. The purification effect of plants; Zhang Hongtao et al. invented composite fly ash as artificial wetland filler. Although the nitrogen and phosphorus treatment effect is better, it has the disadvantages of complicated production, easy blockage of wetland pools, and poor operation effect in winter.

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