Artificial wetland system with strengthened denitrification and dephosphorization

An artificial wetland system and artificial wetland technology, applied in the field of sewage treatment, can solve the problems of complicated production, easy blockage of wetland pools, poor operation effect in winter, etc., and achieve the effect of improving efficiency

Inactive Publication Date: 2009-11-11
NANJING UNIV OF TECH
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  • Abstract
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  • Application Information

AI Technical Summary

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.

Method used

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  • Artificial wetland system with strengthened denitrification and dephosphorization

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Experimental program
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Effect test

Embodiment 1

[0020] The COD of domestic sewage in a village is 55.4-163.2mg / L, the ammonia nitrogen is 7.3-12.5mg / L, and the TP is 2.9-9.3mg / L; the daily water consumption is 48m 3 .

[0021] Sewage enters the regulating hydrolysis tank. The design of the pool body is 4.0m in length x 3.0m in width x 3.5m in height. There is one partition inside, and the residence time of sewage is 16hr. Elastic packing (purchased from Yixing Dongxiang Environmental Protection Filling Factory) is suspended in the pool to form a contact hydrolysis pool to increase the decomposition of anaerobic and facultative microorganisms. At the outlet of the regulating hydrolysis tank, set a water outlet 50cm higher than the artificial wetland and 100cm wide, and hang the three-dimensional elastic packing (purchased from Yixing Dongxiang Environmental Protection Filling Factory) at the protrusion of the notch, each hanging 0.5m long, and hanging the packing 10 according to the width Strings, each with 5 fillers to for...

Embodiment 2

[0026] The COD of sewage discharged from a food factory is 157.1-361.7mg / L, the ammonia nitrogen is 11.3-24.5mg / L, and the TP is 4.4-16.4mg / L; the displacement is 178m 3 / sky. It is processed as follows with this process.

[0027] Sewage enters the regulating hydrolysis tank. The design of the pool body is 10.0m long x 6.0m wide x 3.5m high. There is one partition inside, and the residence time of sewage is 24hr. Shield-shaped elastic packing (purchased from Yixing Dongxiang Environmental Protection Filling Factory) is suspended in the pool to strengthen the decomposition of anaerobic and facultative microorganisms. At the outlet of the regulating hydrolysis tank, set a water outlet 100cm higher than the artificial wetland and 200cm wide, and hang the three-dimensional elastic filler (Yixing Dongxiang Environmental Protection Filling Factory) on the protrusion of the notch, each hanging 1.0m long, and hanging 20 strings of fillers according to the width. There are 10 fillers...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/32C02F3/30
CPCY02W10/10
Inventor 尤朝阳路宏伟韩苏娟
Owner NANJING UNIV OF TECH
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