CN104556377A - Method for improving nitrogen removal efficiency of low-pollution water body with low carbon nitrogen ratio - Google Patents

Method for improving nitrogen removal efficiency of low-pollution water body with low carbon nitrogen ratio Download PDF

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Publication number
CN104556377A
CN104556377A CN201410777631.4A CN201410777631A CN104556377A CN 104556377 A CN104556377 A CN 104556377A CN 201410777631 A CN201410777631 A CN 201410777631A CN 104556377 A CN104556377 A CN 104556377A
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China
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water
low
gravel bed
flow
carbon
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CN201410777631.4A
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CN104556377B (en
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何圣兵
陈雪初
周伟丽
王正
张露
戴谨微
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment
    • C02F3/305Nitrification and denitrification treatment characterised by the denitrification
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/32Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Abstract

The invention discloses a method for improving nitrogen removal efficiency of a low-pollution water body with a low carbon nitrogen ratio. The method comprises the following steps: constructing a surface flow constructed wetland and a horizontal flow ecology gravel bed, connecting the surface flow constructed wetland and the horizontal flow ecology gravel bed in series by using a pipeline, and allowing low-pollution water to flow in from the surface flow constructed wetland and flow out of the horizontal flow ecology gravel bed. The nitrogen removal effect is improved by virtue of the denitrification effect at the mud-water interface of the surface flow constructed wetland; partial nitrogen and phosphorus pollutants are absorbed by virtue of submerged plants and floating-leaved plants, and the content of available organic matters in the water body is improved by virtue of secretion of the plant system and decomposition of plant residues; an oxygen-deficient environment is formed in the horizontal flow ecology gravel bed, attached growth of denitrifying bacteria is promoted, the content of ammonia nitrogen and suspended solids in the water is reduced by virtue of adsorption, filtration and sedimentation effects of gravel and zeolite mixed substrates, and the effluent transparency is improved; and meanwhile, the organic matters in the inflow water of the surface flow constructed wetland can provide a material base for the denitrification effect in the gravel bed, so that the nitrogen removal effect of the system is wholly improved.

Description

A kind of method improving the low stain water body nitric efficiency of low ratio of carbon to ammonium
Technical field
The present invention relates to the low-pollution water denitrification system of low ratio of carbon to ammonium, particularly relate to a kind of technological method being the polluted-water of the low C/N ratio of representative with plant tail water of purifying waste water, agricultural area source, nitrate micro-polluted surface water body etc., set up Surface Flow Constructed Wetlands, water body part nitrate is removed by the denitrification at surface current artificial wetland's water sludge interface place, simultaneously by the secretion of waterplant root system of planting in wet land system and the decomposition of plant residue, the utilized organic content in water body can also be increased; To connect after surface current artificial wetland ecological gravel bed, gravel bed is inner easily to be formed anaerobic environment and is conducive to denitrifying bacteria apposition growth, because the C/N of Surface Flow Constructed Wetlands water outlet increases, effectively anti-nitration reaction can be there is under anaerobic environment after entering gravel bed, improve denitrification effect, gravel bed has good removal effect to suspended substance in water, can improve and water clarity and landscape effect, belongs to low stain water body eco-treatment technology field.
Background technology
At present, along with the Large scale construction of municipal sewage plant of China, a large amount of Sewage Plant tail water is had every day to produce; The nitrogen content of Sewage Plant tail water, compared with surface water body, belongs to heavy polluted water, if directly discharged, can carry a large amount of nitrogen load and enter receiving water body.In addition, agricultural area source, owing to there being various lots of feature, also can carrying a large amount of nitrate and enter Hu Ku.So, the nitrogen load entering Hu Ku be controlled, need to carry out further ecological purification process to this kind of low stain water body.And the main nitrogen form in the tail water of Sewage Plant and agricultural area source is nitrate nitrogen, the maximum feature of this kind of water body is exactly low-carbon high-nitrogen, C/N is lower, therefore is mainly to lack utilizable organic carbon source in water body by the bottleneck of biological denitrification denitrogenation.
Often adopt the technique means of artificial swamp to process this kind of low-pollution water now, but owing to lacking carbon source, denitrification effect is still not good; And the means of additional carbon not only increase running cost, too increase the probability of Wetland clogging, but also there is the possibility of secondary pollution.Therefore, research and develop the technological method effectively removing nitrate in the low stain water body of low ratio of carbon to ammonium and there is very important realistic meaning.
Summary of the invention
Object of the present invention, is the deficiency of the low stain water body denitrification efficiency for existing low C/N ratio, provides a kind of method improving the low stain water body nitric efficiency of low ratio of carbon to ammonium.
To achieve these goals, technical scheme of the present invention is: a kind of method improving the low stain water body nitric efficiency of low ratio of carbon to ammonium, be structure surface current artificial wetland and a horizontal flow ecological gravel bed and by them with placed in series, allow low-pollution water flow to from surface current artificial wetland, flow out from horizontal flow ecological gravel bed.
The depth of water of described surface current artificial wetland controls at 0.3-0.6m, interior kind of floatingleaved plant and submerged plant, and the collective coverage of floatingleaved plant and submerged plant is not less than 40% of surface current artificial wetland's area.
Described floatingleaved plant is Herba Eichhorniae, and submerged plant comprises water caltrop, eel grass; Herba Eichhorniae corral is planted.
The planar dimension of described surface current artificial wetland is 20 × 10m, and the depth of water is 0.5m.
Place gravel and zeolite inside described horizontal flow ecological gravel bed, the volume ratio of gravel and zeolite is 1: 1, particle size range 5-15cm.
The planar dimension of described horizontal flow ecological gravel bed is 4 × 3m, and the degree of depth is 1.5m.
The inlet channel diameter of described horizontal flow ecological gravel bed is 50mm, and outlet conduit diameter is DN50.
Surface current artificial wetland in the present invention can play the denitrification usefulness of artificial swamp water sludge interface effectively; In wetland, plant floatingleaved plant and submerged plant, a small amount of nitrogen phosphorus substance can be assimilated by the growth of plant, more importantly, the secretion of waterplant root system and the decomposition of plant residue can be utilized, improve in water body and can utilize organic content.
Horizontal flow ecological gravel bed in the present invention can apposition growth microorganism.Gravel bed can play retaining of filler and adsorption, reduces the content of ammonia nitrogen and suspended substance in water inlet; In addition, gravel bed and ambient atmosphere environment are separated, and easily form anaerobic environment, by being attached to the effect of the heterotroph denitrifying bacteria on inner stuffing, make full use of the organism carried in surface current artificial wetland's water outlet, good denitrification is carried out to water inlet nitrate and removes.Thus effectively improve effluent quality.
The present invention is directed to the water quality characteristic of low stain water body low-carbon high-nitrogen, the characteristic at mating surface artificial wetland water sludge interface place and biological denitrification principle, by arranging the suitable depth of water, the contact probability of strengthening water body and bed mud interface, utilize the denitrifying bacteria of interface, organic carbon source and anaerobic-aerobic microenvironment, improve the denitrifying capacity of surface current artificial wetland, promote effluent quality; Planting aquatic plants in surface current artificial wetland, by the secretion of waterplant root system and the decomposition of plant residue, can utilize organic matter for providing in water on the other hand; And the ecological gravel bed of follow-up setting can build anaerobic environment, and be conducive to denitrifying bacteria apposition growth, thus denitrification denitrogenation effect can be played further, the carrier such as gravel, zeolite that gravel bed inside is placed, the functions such as absorption, interception, precipitation can be played, have good removal effect to the ammonia nitrogen in water inlet, suspended substance.Present method can improve the denitrification efficiency of low-carbon high-nitrogen low stain water body effectively.
Accompanying drawing explanation
Fig. 1 is the apparatus structure schematic diagram that method of the present invention adopts.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
A kind of technological method improving the low stain water body denitrification efficiency of low ratio of carbon to ammonium, be structure surface current artificial wetland and a horizontal flow ecological gravel bed and by them with placed in series, low-pollution water is allowed to flow to from surface current artificial wetland, flow out from horizontal flow ecological gravel bed, reach the low stain water body denitrification efficiency improving low ratio of carbon to ammonium.Its apparatus structure adopted as shown in Figure 1, number in the figure, 1 for water inlet pipe, 2 for surface current artificial wetland, 3 for floatingleaved plant, 4 for submerged plant, 5 for gravel bed inlet channel, 6 for gravel bed water distribution tracery wall, 7 for gravel bed gravel zeolite mixed-matrix, 8 for gravel bed catchment tracery wall, 9 be gravel bed rising pipe, 10 horizontal flow ecological gravel bed; Solid arrow is depicted as water (flow) direction.In surface current artificial wetland 2, the depth of water controls at 0.3-0.6m, plantation floating plant 3 and submerged plant 4, and area covering degree is not less than 40% of free water surface wetland area; Horizontal flow ecological gravel bed 10 is rectangular configuration, and both sides arrange water inlet, wet well respectively, for distributing and collecting the Inlet and outlet water of gravel bed, places gravel, zeolite mixed-matrix 7 in gravel bed.
It is below an embody rule embodiment of the present invention.
Experiment handling object is the tail water of certain municipal sewage plant, and principal pollutant are nitrate nitrogen, ammonia nitrogen.Measuring nitrate nitrogen content in water inlet is 8 ~ 12mg/L, ammonia-nitrogen content 2 ~ 6mg/L, COD content 23 ~ 48mg/L.
Surface current artificial wetland and ecological gravel bed combined system are built, wherein surface current artificial wetland's planar dimension is 20 × 10m, control available depth is 0.5m, wetland kind planting submerged plant eel grass, water caltrop, and corral plantation floatingleaved plant Herba Eichhorniae, waterplant area control is at the 40-50% of Wetland Area.Synchronized construction horizontal flow ecological gravel bed, planar dimension is 4 × 3m, degree of depth 1.5m, and gravel, zeolite mixed-matrix (volume ratio 1: 1) are placed in the inside, and particle size range 5-15cm, processes the tail water water yield every day and be about 100m 3.Horizontal flow ecological gravel bed inlet channel diameter 50mm, processes the Cemented filling of a rear water DN50 to receiving water body.
After system builds up rear stable half a year, monitoring Inlet and outlet water water quality, in the water outlet of gravel bed, nitrate content drops to 3.2 ~ 4.8mg/L, ammonia-nitrogen content 0.14 ~ 0.42mg/L, COD content 18 ~ 37mg/L, transparency stable maintains 1.0 ~ 1.5m, and the construction of system serves good strengthening effect for the denitrogenation of Sewage Plant tail water.

Claims (7)

1. one kind is improved the method for the low stain water body nitric efficiency of low ratio of carbon to ammonium, it is characterized in that, build a surface current artificial wetland and a horizontal flow ecological gravel bed and by them with placed in series, allow low-pollution water flow to from surface current artificial wetland, flow out from horizontal flow ecological gravel bed.
2. the method for the low stain water body nitric efficiency of raising low ratio of carbon to ammonium according to claim 1, it is characterized in that, the depth of water of described surface current artificial wetland controls at 0.3-0.6m, interior kind of floatingleaved plant and submerged plant, the collective coverage of floatingleaved plant and submerged plant is not less than 40% of surface current artificial wetland's area.
3. the method for the low stain water body nitric efficiency of raising low ratio of carbon to ammonium according to claim 2, is characterized in that, described floatingleaved plant is Herba Eichhorniae, and submerged plant comprises water caltrop, eel grass; Herba Eichhorniae corral is planted.
4. the method for the low stain water body nitric efficiency of raising low ratio of carbon to ammonium according to claim 2, is characterized in that, the planar dimension of described surface current artificial wetland is 20 × 10m, and the depth of water is 0.5m.
5. the method for the low stain water body nitric efficiency of raising low ratio of carbon to ammonium according to claim 1, is characterized in that, places gravel and zeolite inside described horizontal flow ecological gravel bed, and the volume ratio of gravel and zeolite is 1: 1, particle size range 5-15cm.
6. the method for the low stain water body nitric efficiency of raising low ratio of carbon to ammonium according to claim 5, is characterized in that, the planar dimension of described horizontal flow ecological gravel bed is 4 × 3m, and the degree of depth is 1.5m.
7. the method for the low stain water body nitric efficiency of raising low ratio of carbon to ammonium according to claim 5, is characterized in that, the inlet channel diameter of described horizontal flow ecological gravel bed is 50mm, and outlet conduit diameter is DN50.
CN201410777631.4A 2014-12-15 2014-12-15 A kind of method of the low stain water body nitric efficiency improving low ratio of carbon to ammonium Active CN104556377B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105601054A (en) * 2016-03-18 2016-05-25 北京科技大学 Rural domestic breeding mixed sewage treatment integrated system
CN106927571A (en) * 2016-12-30 2017-07-07 山东大学 A kind of method using carbon type modification biological charcoal strengthened artificial wet land denitrogenation is secreted by force

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Publication number Priority date Publication date Assignee Title
WO2005042419A1 (en) * 2003-10-20 2005-05-12 Dharma Living Systems, Inc. Tidal vertical flow wastewater treatment system and method
CN201128703Y (en) * 2007-06-01 2008-10-08 山东大学 Subsurface flow and surface flow alternate constructed wetland
CN101481177A (en) * 2009-01-15 2009-07-15 北京师范大学 Surface flow-horizontal undercurrent composite manpower wetland system
CN103739081A (en) * 2014-01-13 2014-04-23 上海交通大学 Subsurface flow wetland device for enhanced nitrogen removal of low-pollution water

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
WO2005042419A1 (en) * 2003-10-20 2005-05-12 Dharma Living Systems, Inc. Tidal vertical flow wastewater treatment system and method
CN201128703Y (en) * 2007-06-01 2008-10-08 山东大学 Subsurface flow and surface flow alternate constructed wetland
CN101481177A (en) * 2009-01-15 2009-07-15 北京师范大学 Surface flow-horizontal undercurrent composite manpower wetland system
CN103739081A (en) * 2014-01-13 2014-04-23 上海交通大学 Subsurface flow wetland device for enhanced nitrogen removal of low-pollution water

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105601054A (en) * 2016-03-18 2016-05-25 北京科技大学 Rural domestic breeding mixed sewage treatment integrated system
CN106927571A (en) * 2016-12-30 2017-07-07 山东大学 A kind of method using carbon type modification biological charcoal strengthened artificial wet land denitrogenation is secreted by force

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