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An/O type composite artificial wetland system for enhanced treatment of low-C/N ratio wastewater

A constructed wetland system and enhanced treatment technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of low phosphorus removal load and difficulty in reaching sewage in single-stage constructed wetland systems Requirements for in-depth treatment, large floor space and other issues, to achieve the effect of low operating costs, enriching migration and conversion channels, and reducing operating costs

Inactive Publication Date: 2012-07-11
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it also has problems such as large area, low nitrogen and phosphorus removal load, and the single-stage constructed wetland system has been difficult to meet the requirements of advanced sewage treatment.

Method used

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  • An/O type composite artificial wetland system for enhanced treatment of low-C/N ratio wastewater
  • An/O type composite artificial wetland system for enhanced treatment of low-C/N ratio wastewater

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0038] Embodiment 1: The outlet water of the sedimentation tank 1 enters the horizontal subsurface flow artificial wetland (HSSF) 3 through the outlet pipe 1-1 from the outlet pump 2, enters the water distribution area 3-2 through the inlet pipe 3-1, distributes water evenly, and then passes through the diversion After the diversion of the plate 3-3, it enters the packing layer 3-4, enters the vertical subsurface flow constructed wetland (VSSF) 4 through the outlet pipe 3-6 in the catchment area 3-5, and passes through the surface water distribution pipe of the vertical subsurface flow constructed wetland (VSSF) 4 4-1 Distribute water evenly. After the sewage flows through the packing layer 4-2, it flows into the return pool 5 through the outlet water level adjustment pipe 4-4 in the catchment area 4-3, and the return liquid flows back into the horizontal subsurface flow artificial wetland (HSSF ) 3 of the return pipe 3-7, and then denitrification.

specific Embodiment approach 2

[0039] Specific implementation mode two: combination figure 1 with figure 2 Describe this embodiment, this embodiment is provided with outlet water level regulating pipe 4-4 in vertical subsurface flow constructed wetland (VSSF) 4, and outlet water level regulating pipe 4-4 can be filled in vertical subsurface flow constructed wetland (VSSF) 4 by adjusting the water level Create an unsaturated layer and a saturated layer in layer 4-2, so as to realize the effective synergy of the three functional microorganisms of aerobic ammonium oxidizing bacteria (AOB), nitrite oxidizing bacteria (NOB) and anaerobic ammonium oxidizing bacteria (Anammox). The nitrogen removal method in the system greatly improves the ammonia nitrogen removal efficiency of the patent of the present invention.

specific Embodiment approach 3

[0040] Specific implementation mode three: combination figure 1 with figure 2 Describe this embodiment, the reflux pump 6 in this embodiment can adjust the flow rate of the reflux liquid to achieve different reflux ratios in the system, thereby optimizing the denitrification capacity of the horizontal subsurface flow constructed wetland (HSSF) 3, and making full use of the organic carbon in the influent source, further ensuring the higher denitrification efficiency of the patent of the present invention.

[0041] Specific implementation mode four: combination figure 1 with figure 2 Describe this embodiment, this embodiment is provided with water distributing area 3-2, catchment area 3-5 and deflector 3-3 in the middle of horizontal subsurface flow constructed wetland (HSSF), and sedimentation tank 1 is fed by water inlet pump 2 The water inlet pipe 3-1 of the horizontal subsurface flow constructed wetland (HSSF) 3 enters the water distribution area 3-2, and further distri...

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Abstract

The invention relates to an An / O type composite artificial wetland system for the enhanced treatment of low-C / N ratio wastewater. The invention relates to a wastewater treatment apparatus, which is a land treatment apparatus suitable for treating low-C / N ratio wastewater and recycling treated water. According to the An / O type composite artificial wetland system, wastewater sequentially flows through a horizontal subsurface flow wetland and a vertical subsurface flow wetland, effluent water part then flows back into the horizontal subsurface flow wetland, and a dissolved oxygen (DO) gradient is utilized to couple aerobic ammonia-oxidizing bacteria (AOB), nitrite-oxidizing bacteria (NOB) and anammox in the vertical subsurface flow wetland by means of effluent water level regulation in order to enhance the low-C / N ratio wastewater denitrification efficiency of the An / O type composite artificial wetland system. Broken bricks, oyster shells and other packing with large specific surface area, high porosity and good adsorbability are filled in the composite artificial wetland system, consequently, the amount of organisms held by the system is greatly increased, and high phosphorus-and-nitrogen-removing efficiency is guaranteed. The An / O type composite artificial wetland system has the advantages of simple structure, multiple functions, high efficiency, low cost and the like, is easy to operate and manage, can stably operate, and can synchronously remove carbon, nitrogen and phosphorus, the treated effluent water can be directly recycled, landscape plants can be planted on the ground surface, and the An / O type composite artificial wetland system can be combined with ecological construction and city and town greening functions.

Description

technical field [0001] The patent of the invention relates to an An / O type composite constructed wetland system for synchronous decarbonization, nitrogen and phosphorus removal of waste water with low carbon-to-nitrogen ratio. It belongs to the field of water pollution control. Background technique [0002] In recent years, with the development of the economy, the content of nitrogen and phosphorus elements (especially ammonia nitrogen) in industrial, agricultural and urban domestic sewage is getting higher and higher. A large amount of nitrogen and phosphorus wastewater is directly discharged into the water body without proper treatment, seriously polluting the water body environment, leading to severe eutrophication of a large number of rivers and lakes, frequent occurrence of coastal red tides, and serious harm to human health. The contradiction of shortage seriously restricts the implementation of sustainable development strategy. Among them, the most important polluta...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 刘超翔王振朱葛夫
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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