CN202576158U - System for treating sewage and controlling nitrous oxide discharge in constructed wetland - Google Patents

System for treating sewage and controlling nitrous oxide discharge in constructed wetland Download PDF

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Publication number
CN202576158U
CN202576158U CN2012201894154U CN201220189415U CN202576158U CN 202576158 U CN202576158 U CN 202576158U CN 2012201894154 U CN2012201894154 U CN 2012201894154U CN 201220189415 U CN201220189415 U CN 201220189415U CN 202576158 U CN202576158 U CN 202576158U
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nitrous oxide
water
constructed wetland
sewage
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CN2012201894154U
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柴宏祥
何强
李更生
王伟杰
杨世琪
陈炜
胡学斌
方俊华
吴正松
王�琦
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Chongqing University
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Chongqing University
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/40—Protecting water resources
    • Y02A20/402—River restoration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/22—Improving land use; Improving water use or availability; Controlling erosion
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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Abstract

The utility model discloses a system for treating sewage and controlling nitrous oxide discharg in a constructed wetland, which belongs to the technical field of sewage treating technology and environment protection. Nitrous oxide which is used as greenhouse gas can quicken the global warming and can damage the ozonosphere after reacting with the ozonosphere. Aiming at the discharge of the nitrous oxide in the constructed wetland, a method which is adopted for controlling the nitrous oxide comprises the following steps of 1, regulating the pH (Potential of Hydrogen) of water to be 6.8-7.5 in a pretreating pond; and 2, dividing the system for treating the sewage and controlling the nitrous oxide discharge in the constructed wetland into three sections to operate, adopting horizontal flow in a first section, planting reeds and/or cane shoots on the first section, adopting horizontal underflow in a second section which is free from plants, adopting the horizontal flow in a third section, and planting water nymphs and lotus roots in the third section. The system disclosed by the utility model has the advantages that the generation and the discharge of the nitrous oxide in the constructed wetland are greatly reduced while keeping the conventional advantages and the ecological restoration functions of the constructed wetland, and the system can be applied to the domestic sewage treatment in a dispersing type village or a small town and the ecological restoration of rivers and lakes.

Description

A kind of artificial swamp WWT nitrous oxide emission system
Technical field
The utility model belongs to sewage disposal technology and environmental protection technical field, is specifically related to a kind of artificial swamp WWT nitrous oxide emission system.
Background technology
Artificial marsh sewage treatment system is sewage to be batched controlledly soil often is in state of saturation and growth has on the swampland of water-fast plants such as reed, calamus, Canna generalis Bailey, FENGCHECAO; Sewage along in the certain orientation flow process under water-fast plant and soil combined action, a kind of land treatment system that sewage is purified.Because advantages such as artificial wet land system has reduced investment, management is simple, working cost is cheap, high-efficiency low energy consumption are particularly useful for the WWT of developing country.In recent years, the research about artificial marsh sewage treatment system both at home and abroad comes into one's own day by day, and this technology is also increasingly extensive in the application of China.
Nitrous Oxide is a kind of trace gas in the atmosphere; Though the concentration of Nitrous Oxide only is the per mille of gas concentration lwevel in the atmosphere; But its radiation heat potentiality then be carbonic acid gas 220-300 doubly; Be a kind of important greenhouse gases, and the Nitrous Oxide molecule also can damage to atmospheric ozone layer.Increased before the concentration ratio Industrial Revolution of Nitrous Oxide in the atmosphere at present about 18%, now still with every year about 0.2%-0.3% speed continue to increase.Present aerobic, anoxic and anaerobic state in the artificial marsh sewage treatment system continuously, nitrification and denitrification can be carried out simultaneously, also are considered to an important source of nitrous oxide emission.Therefore, in the construction and management process of artificial swamp, when considering to utilize artificial swamp restoration of the ecosystem function, also should consider how to reduce the discharging of Nitrous Oxide.
Summary of the invention
The utility model aims to provide a kind of artificial swamp WWT nitrous oxide emission system; Promptly under the prerequisite that guarantees the water quality reaching standard discharging; To reduce the generation and the discharging of artificial marsh sewage treatment system Nitrous Oxide in treating processes, reduce Greenhouse effect to environment damage.
The technical scheme of the utility model is following:
A kind of artificial swamp WWT nitrous oxide emission system that the utility model provides comprises pretreatment pool, the controlled oxidation inferior nitrogen discharged artificial marsh sewage treatment system and the retention basin of water route UNICOM successively.
Wherein said pretreatment pool is used to regulate the water inlet pH function of primary sedimentation pond of holding concurrently, and its influent side is provided with dosing pump, in order to regulating the pH of water inlet, the pH=6.8-7.5 of control water inlet because at pH greater than 6.8 o'clock, almost do not have the generation of Nitrous Oxide.Perforated sludge discharge pipe is equipped with in the preliminary sedimentation tank bottom, in order to get rid of the bottom deposition.The water outlet of pretreatment pool gets into the inferior nitrogen discharged artificial marsh sewage treatment system of controlled oxidation with free drop mode;
The inferior nitrogen discharged artificial marsh sewage treatment system of described controlled oxidation constitutes by three sections: the sandy gravel that first section employing is mixed with calcite is a filter bed; Plant reed and/or wild rice stem above; With the operation of surface level stream mode, after first section processing, BOD has obtained certain degraded in the water; Nitration reaction is strengthened under aerobic condition, and forms nitrous acid nitrogen and nitrate nitrogen.Second section is adopted the upper strata is sand grains, and lower floor is easy to the medium that makes current logical, and soil and the rubble bigger like particle diameter are filter bed; Do not plant any plant above; Move with the horizontal drowned flow mode, this section is in anaerobic state, and anti-nitration reaction takes place in this section; Meta-bolites is main with nitrogen mainly, does not almost have the generation of Nitrous Oxide.The sandy gravel that the 3rd section employing is mixed with zeolite is a filter bed, plantation water lily and/or lotus rhizome above, and with the operation of surface level stream mode, this section is to regulate COD/N and that part of BOD of additional carbon makes water quality reach emission standard in order to remove second section.Mode with horizontal plug-flow after three sections artificial swamp series operations, first section water outlet are collected through first water collecting basin flows in second section, during second section water outlet is dropped after second water collecting basin is collected and flowed into the 3rd section.
It is the 150mm aperture that said first water collecting basin and second section next-door neighbour one side has diameter, 200mm at interval, and chemicals dosing plant is inserted in first water collecting basin top, in order to regulate second section COD/N, makes COD/N=5-10.
The utlity model has following advantage:
1, the artificial marsh sewage treatment system of the utility model has adopted the three-stage structure series operation; Each section adopts various structure and structure, builds different dissolved oxygens and distributes, and can realize the treatment effect that contaminant removal process is different; Environmental engineering and ecological engineering organic assembling, combined utilization have been carried out; Overcome the limitation that each technology is used separately, when keeping artificial swamp traditional advantages and restoration of the ecosystem function, significantly reduced the generation and the discharging of artificial swamp Nitrous Oxide.
2, the employed filler of native system mainly is a sandy gravel, and filter bed is difficult for stopping up, and is with low cost.
3, native system is owing to adopt three grades of series connection, and the dissolved oxygen distributional differences at different levels that pass through are built the suitable microenvironment and the condition of contaminant degradation process, and are high to the clearance of organic matter, can be good at denitrogenation dephosphorizing nitrogen, reduced the possibility that eutrophication takes place.Waterplant can also be beautified the environment, and plays the effect of decoration.
The utility model can be applicable to the restoration of the ecosystem in decentralized rural area or small town sewage processing and rivers, lakeside.
Description of drawings
Fig. 1. the artificial swamp WWT nitrous oxide emission system synoptic diagram of the utility model embodiment;
1: water inlet pipe 2: pretreatment pool 3: shore pipe 4: first section 5 of the inferior nitrogen discharged artificial marsh sewage treatment system of controlled oxidation: second section 6 of the inferior nitrogen discharged artificial marsh sewage treatment system of controlled oxidation: the 3rd section 7 of the inferior nitrogen discharged artificial marsh sewage treatment system of controlled oxidation: retention basin 8: reed and/or wild rice stem 9: rising pipe 10: chemicals dosing plant 11: lotus rhizome and water lily.
Embodiment
Specify the principle of work and the embodiment of the utility model below in conjunction with accompanying drawing:
Referring to Fig. 1, native system comprises pretreatment pool 2, controlled oxidation inferior nitrogen discharged first section 4, second sections 5, the 3rd sections 6 of the artificial marsh sewage treatment systems and the retention basin 7 of water route connection successively.The influent side of pretreatment pool 2 is provided with dosing pump; Second section 5 front and back are provided with first water collecting basin and second water collecting basin; It is the 150mm aperture that first water collecting basin and second section next-door neighbour's one side have diameter, and 200mm inserts chemicals dosing plant 10 above first water collecting basin at interval; In order to regulate second section COD/N, make COD/N=5-10.Mode with horizontal plug-flow after first section water outlet is collected through first water collecting basin flows in second section, during second section water outlet is dropped after second water collecting basin is collected and flowed into the 3rd section.
Sewage gets into the pretreatment pool 2 from water inlet pipe 1, when sewage pH is lower or higher, can make pH be stabilized in 6.8-7.5 through adding corresponding medicament because at pH greater than 6.8 o'clock, almost do not have the generation of Nitrous Oxide.Pretreatment pool 2 bottoms are provided with shore pipe can get rid of the bottom deposition.The water outlet of pretreatment pool 2 is freely dropped and is got into first section 4 of the inferior nitrogen discharged artificial marsh sewage treatment system of controlled oxidation; Plant above first section 4 and be implanted with reed and/or wild rice stem 8; Ammonification and nitration reaction take place in sewage in first section; Be converted into nitrate nitrogen and nitrite nitrogen to organonitrogen, and remove most of BOD.Mode with horizontal plug-flow after sewage after first section processing is collected in first water collecting basin gets in second section 5, and second section is in anaerobic state, and sewage in this section anti-nitration reaction takes place; When if COD/N ratio is low; Can add carbon source at first water collecting basin, the higher waste water of organic content that adds with good conditionsi is like beer waste water, dairies waste water, sugar production wastewater etc.; COD/N is remained between the 5-10, and COD/N is less at this interval Nitrous Oxide that produces.The 3rd section 6 is to realize denitrification and BOD that additional carbon causes in order to remove, and guarantees that promptly the water quality reaching standard discharging sets up, and main purpose is to remove remaining BOD.Planting the water outlet be implanted with 11, the three sections of lotus rhizome and water lilys above is collected in the retention basin 7 and treats reuse.
Main technical details:
First section and the 3rd section concrete design variable
Water-surface gradient: 4%-5%
Hydraulic load: 2.4-5.8cm/d
Year days running: 300d
Water depth: 0.1-0.4m
Hydraulic detention time: 1.5-4d
Water distribution cycle: 7d/ week
Batch the time: 8-24h/d
Organic loading :≤65kgBOD 5/ (hm 2D)
Nitrogen load :≤16 kg/ (hm 2D)
Second section concrete design variable
The bed base slope falls: 2%-4%
Hydraulic load: 3.3-8.2cm/d
Year days running: 365d
Hydraulic detention time: 4-5d
Water distribution cycle: 7d/ week
Batch the time: 8-24h/d
Organic loading: 64-150kgBOD 5/ (hm 2D)
Nitrogen load :≤28kg/ (hm 2D).

Claims (4)

1. artificial swamp WWT nitrous oxide emission system is characterized in that: this system comprises pretreatment pool, controlled oxidation inferior nitrogen discharged artificial marsh sewage treatment system and the retention basin that water route successively is communicated with;
The influent side of described pretreatment pool is provided with dosing pump, in order to regulate the pH of water inlet, makes pH maintain 6.8-7.5; The water outlet of pretreatment pool gets into the inferior nitrogen discharged artificial marsh sewage treatment system of controlled oxidation with free drop mode;
The inferior nitrogen discharged artificial marsh sewage treatment system of described controlled oxidation is made up of three sections series connection: the sandy gravel that first section employing is mixed with calcite is a filter bed, and plantation reed and/or wild rice stem move with the surface level stream mode above; Second section is adopted the upper strata is sand grains, and lower floor is that the medium that is easy to current are led to is a filter bed, moves with the horizontal drowned flow mode; The sandy gravel that the 3rd section employing is mixed with zeolite is a filter bed, and plantation water lily and/or lotus rhizome move with the surface level stream mode above; Mode with horizontal plug-flow after first section water outlet is collected through first water collecting basin flows in second section, during second section water outlet is dropped after second water collecting basin is collected and flowed into the 3rd section;
Wherein, above first water collecting basin, insert chemicals dosing plant,, make COD/N=5-10 in order to regulate second section COD/N.
2. artificial swamp WWT nitrous oxide emission system according to claim 1 is characterized in that: said first section and the 3rd section concrete design variable are following:
Water-surface gradient: 4%-5%
Hydraulic load: 2.4-5.8cm/d
Year days running: 300d
Water depth: 0.1-0.4m
Hydraulic detention time: 1.5-4d
Water distribution cycle: 7d/ week
Batch the time: 8-24h/d
Organic loading :≤65kgBOD 5/ (hm 2D)
Nitrogen load :≤16 kg/ (hm 2D)
Second section concrete design variable is following:
The bed base slope falls: 2%-4%
Hydraulic load: 3.3-8.2cm/d
Year days running: 365d
Hydraulic detention time: 4-5d
Water distribution cycle: 7d/ week
Batch the time: 8-24h/d
Organic loading: 64-150kgBOD 5/ (hm 2D)
Nitrogen load :≤28kg/ (hm 2D).
3. artificial swamp WWT nitrous oxide emission system according to claim 1 and 2 is characterized in that: having diameter in first water collecting basin and second section next-door neighbour, one side is the 150mm aperture, at interval 200mm.
4. artificial swamp WWT nitrous oxide emission system according to claim 3 is characterized in that: perforated sludge discharge pipe is equipped with in described pretreatment pool bottom, gets rid of sedimentary mud in the pond.
CN2012201894154U 2012-04-28 2012-04-28 System for treating sewage and controlling nitrous oxide discharge in constructed wetland Expired - Lifetime CN202576158U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102642990A (en) * 2012-04-28 2012-08-22 重庆大学 Constructed wetland sewage treatment nitrous oxide discharging control system
CN107998874A (en) * 2017-12-19 2018-05-08 南京科技职业学院 A kind of artificial swamp VOCs exhaust gas purifying methods and system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102642990A (en) * 2012-04-28 2012-08-22 重庆大学 Constructed wetland sewage treatment nitrous oxide discharging control system
CN102642990B (en) * 2012-04-28 2013-09-11 重庆大学 Constructed wetland sewage treatment nitrous oxide discharging control system
CN107998874A (en) * 2017-12-19 2018-05-08 南京科技职业学院 A kind of artificial swamp VOCs exhaust gas purifying methods and system
CN107998874B (en) * 2017-12-19 2020-12-15 南京科技职业学院 Constructed wetland VOCs waste gas purification method and system

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Granted publication date: 20121205

Effective date of abandoning: 20130911

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