Multistage aeration oxidation pond-gravel bed-constructed wetland tail water efficient treatment system

An aeration oxidation tank and artificial wetland technology, which is applied in the field of multi-stage aeration oxidation tank-gravel bed-constructed wetland tail water efficient treatment system, can solve the problems that cannot meet the needs of modern urban water control, easily block the dissolved oxygen content of effluent, and reduce the amount of dissolved oxygen in the effluent. Water quality and water quality are sensitive and other issues, to achieve the effect of good ecological landscape effect, strong adaptability of water quality and water quantity fusion, and excellent effect

Pending Publication Date: 2019-11-29
深圳市水务规划设计院股份有限公司
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AI Technical Summary

Problems solved by technology

However, the traditional constructed wetland technology has the disadvantages of large area, easy to block, low dissolved oxygen content in the effluent, and is sensitive to the quality and quantity of influent water, and the season and temperature affect the treatment effect, etc.
The patent with the publication number of CN 103253822 A claims to use oxidation pond and gravel bed as pretreatment, vertical flow constructed wetland, stabilization pond and surface flow constructed wetland to carry out integrated tail water advanced treatment technology, but there are still problems such as long hydraulic retention time and land occupation. The area is large, and many auxiliary projects are needed for supporting, especially its effluent is only COD Cr and BOD 5 Meets Surface Water Class III Standard, NH 3 -N and TP only meet the standard of surface water IV, and still cannot meet the water control needs of modern cities with tight land use and high requirements for river water quality

Method used

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  • Multistage aeration oxidation pond-gravel bed-constructed wetland tail water efficient treatment system
  • Multistage aeration oxidation pond-gravel bed-constructed wetland tail water efficient treatment system
  • Multistage aeration oxidation pond-gravel bed-constructed wetland tail water efficient treatment system

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specific Embodiment

[0048] Specific embodiment: The above-mentioned multi-stage aerated ecological oxidation tank + ecological gravel bed + high-efficiency vertical flow constructed wetland integration technology is applied to the tail water deep purification project of a sewage plant in South China. The project construction land area is 43,000 m 2 , The project investment is 30 million yuan. The project is used to efficiently treat the first-class A effluent of the sewage treatment plant, and the treated water volume is 20,000 m 3 / d, and use its effluent as river ecological replenishment. Among them, the hydraulic retention time of the ecological oxidation pond is 2.5-3.0h, and the volume is 2820m 3 , effective residence time 2h, effective volume 1680m 3 , the air-water ratio is 3.0:1, and the size is 15×10×4.7m (parallel operation). Microporous nano-aeration tubes are arranged at the bottom of the pool, with an interval of 0.8 to 1.2 meters, for intermittent aeration. 6 supporting fans, f...

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Abstract

The invention relates to the technical field of water treatment, in particular to a multistage aeration ecological oxidation pond-gravel bed-constructed wetland tail water efficient treatment system.The treatment system comprises: an adjusting tank; an ecological oxidation pond; an ecological gravel bed; an efficient vertical flow constructed wetland; and an aeration clean water tank. Directed atthe problems that the traditional constructed wetland is sensitive to suspended solids and the dissolved oxygen content of effluent water is not high, the system provided by the invention integratesand optimizes multiple processes, the ecological oxidation pond and the ecological gravel bed are adopted for pretreatment, the constructed wetland is covered with a grit layer to relieve silt blockage of the wetland in the flood period, and a microporous nano-material is employed for aeration in the ecological oxidation pond and the clean water tank, thus significantly increasing the dissolved oxygen content of effluent water. The three processes are combined in series to complement each other's advantages, and multistage microporous nano-aeration is carried out in the ecological oxidation pond and the clean water tank at the same time, and through the above ecological treatment process, the main water quality indexes can stably reach the class III water standards of surface water. The system also has the advantages of low investment, strong water quality and quantity fusion adaptability, simple operation, good ecological landscape effect and the like.

Description

technical field [0001] The invention relates to the technical field of tail water advanced treatment, in particular to a multi-stage aeration oxidation tank-gravel bed-constructed wetland tail water efficient treatment system. Background technique [0002] At present, my country's urban sewage treatment plants mainly use COD Cr 、BOD 5 , SS, nitrogen and phosphorus are the main removal objects, and most of their discharge is in accordance with the first-level A or first-level B standard in the national "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), which is consistent with the "Surface Water Environmental Quality Standard (GB3838-2002), there is still a big gap in the minimum standard of Class V water, and its tail water can only be used for landscape water supply or municipal miscellaneous purposes. For the widely existing damaged water ecosystem in my country, this cannot fundamentally solve the problem of eutrophication of the receiving...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F3/32C02F101/30
CPCC02F3/30C02F3/32C02F2101/30
Inventor 黄奕龙张利萍陈朗胡仁贵刘雪朋杜朋辉
Owner 深圳市水务规划设计院股份有限公司
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