CN103204588B - Vertical undercurrent artificial wetland system capable of reinforcing removal of total nitrogen without obstruction - Google Patents
Vertical undercurrent artificial wetland system capable of reinforcing removal of total nitrogen without obstruction Download PDFInfo
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- CN103204588B CN103204588B CN201210012834.5A CN201210012834A CN103204588B CN 103204588 B CN103204588 B CN 103204588B CN 201210012834 A CN201210012834 A CN 201210012834A CN 103204588 B CN103204588 B CN 103204588B
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention relates to a vertical undercurrent artificial wetland system capable of reinforcing removal of total nitrogen without obstruction. The vertical undercurrent artificial wetland system is mainly composed of a filtration column, an upward flow wetland, a downward flow wetland, a sewage backflow apparatus and an aeration apparatus. The aeration apparatus is disposed at the bottom of the downward flow wetland, and effluent flows back to a water inlet of the upward flow wetland. The sewage is subjected to grille treatment. Firstly, the sewage is introduced to the filtration column so as to remove most of the suspended materials, and then is introduced to the upward flow wetland and the downward flow wetland. The upward flow wetland is an oxygen-deficient environment that is beneficial to a denitration reaction; due to the additionally arrangement of the aeration apparatus, the downward flow wetland is an aerobic environment that is beneficial to a nitration reaction; and the effluent from the downward flow wetland flows back to the water inlet of the upward flow wetland according to a proportion. The whole process combines a conventional A/O process and the artificial wetland and forms a novel process that is used for sewage treatment and is capable of efficiently removing the total nitrogen without obstruction. The system can efficiently reduce suspension concentration of intake water of the wetland, increases removal capacity of the total nitrogen of the artificial wetland, and has strong capacity of resisting impact load. The wetland has long service life.
Description
Technical field
The present invention relates to a kind of strengthen removing total nitrogen without block vertical flow artificial wet land system, it is the purge feature of a kind of combination A/O device and constructed wetland device, in one, improve the vertical current constructed wetland sewage disposal technology of nitric efficiency by integrated filter device, regulatable aerating apparatus, reflux and vertical current constructed wetland.
Background technology
Constructed wetland waste water treatment technology is a kind of ecological wastewater processing technology that 20 century 70s rise, it has the advantages such as less investment, working cost are low, convenient management, non-secondary pollution, in recent years successfully for the improvement of the aspects such as sanitary sewage, rural area point source and pollution of area source, storm runoff and lake eutrophication, and obtain significant effect.
But artificial swamp denitrogenation (total nitrogen) efficiency is low, the features such as easy obstruction, have limited applying of its.
Artificial swamp to the removal of nitrogen mainly comprise microorganism in the picked-up of ammonification, plant, matrix absorption and wetland nitrated/denitrification, wherein the latter's contribution maximum.Existing artificial wet land system completes the needs of nitration reaction because naturally negative oxygen ability is difficult to meet nitrifier, so often because nitrification deficiency, ammonia nitrogen fully can not be converted into the raw material nitrate nitrogen of denitrification and nitrite nitrogen and limit the ability of denitrogenating of wetland in the time processing the high sewage of ammonia-nitrogen content.
Stop up is all the major influence factors of restriction artificial swamp widespread use all the time.Research thinks, Wetland clogging is mainly owing to can not filtering inorganics and organic accumulation, and the enrichment of microorganism extracellular polymeric causes.At present, solution mainly contains: the technique and the aeration aerating technique that adopt intermittent water inflow.But these measures have mainly solved latter two factor to the impact of stopping up, and the removal that can not filter inorganics is worked hardly.
For solving above deficiency, current in the application of artificial swamp engineering, often adopt the technique of biochemical pre-treatment and artificial swamp coupling to realize the efficient removal to pollutent.But this treatment process still comes with some shortcomings, specific as follows: 1) technique is disperseed relatively, floor space is larger; 2) process pipeline complexity, energy consumption is larger; 3) management difficulty is larger.
Summary of the invention
The present invention is in order to solve the existing deficiency of above-mentioned prior art, provide a kind of by integrated Filter column, regulatable aerating apparatus, reflux and vertical current constructed wetland in one, improve the vertical current constructed wetland sewage disposal technology of nitric efficiency.
Technical scheme of the present invention:
Without the Vertical Flow Constructed Wetland Systems of clogging strengthening denitrogenation (total nitrogen), treatment step is: sewage, through grid pre-treatment, is removed most of foreign material and macromolecular particle thing, enters Vertical Flow Constructed Wetland Systems purifying treatment.Vertical Flow Constructed Wetland Systems is made up of Filter column, water-distributing device, filler, aerating apparatus, reflux, wetland plant, water level control apparatus etc.
The vertical subsurface flow wetland system of removing without clogging strengthening total nitrogen, comprises Filter column, up stream wetland and downstream wetland;
Described Filter column is the filtration unit of column, hollow, the even perforate of cylinder, and on Filter column, 4-8 hole opened in each cross section, and hole longitudinal pitch is 10-20mm, and aperture is 2-5mm.Filter column is placed in filter vat, is provided with sewage inlet and refluxing opening in Filter column bottom, and sewage after filtration post is removed most suspended substances and partial organic substances, and water flows in filter vat by uniform small pores on Filter column;
Bottom in up stream wetland is provided with water distribution system, and the water inlet of water distribution system is connected with filter vat by pipeline, and up stream wetland is provided with rubble 2nd district, rubble one district, the peat composed of rotten mosses soil layer of stratiform from bottom to up successively; Described water distribution system is by a main water distributor, and the water distribution branch pipe of some symmetries composition.Wherein, 45 ° in both sides, axis alternately perforates of water distribution branch pipe, one-sided two pitch of holes 50-100mm, aperture is 5-8mm.
Downstream wetland is provided with peat composed of rotten mosses soil layer, rubble one district, rubble 2nd district of stratiform from top to bottom successively; The peat composed of rotten mosses soil layer of up stream wetland and downstream wetland is connected by pipeline;
Downstream wetland bottom is equipped with aeration tube, and aeration tube is connected with the air outlet of the outer gas blower of wetland;
Downstream wetland bottom is provided with rising pipe, and rising pipe stretches in water leg, and the rising pipe place in water leg is connected with a water level regulator;
Described water level regulator comprises a flexible pipe, lanyard and hook, flexible pipe one end is connected with rising pipe, the flexible pipe the other end is provided with lanyard, inner side-wall in water leg is provided with hook, lanyard is fastened and is placed on hook above, by adjusting the height of the length of lanyard and/or the water side of the height-adjustable flexible pipe of hook in water leg; Sidewall in water leg is provided with overflow port, and water leg is connected with refluxing opening by pipeline.
Layered fillers district packing height ratio in up stream wetland and downstream wetland is: the effective length ratio of peat composed of rotten mosses soil layer, rubble one district, rubble two San Zhong packing areas, district is (1-2): (6-8): (1-2);
Wherein, in rubble 2nd district, the rubble packing material size of filling is greater than the rubble packing material size loading in rubble one district.
Adopt aeration time, the aeration rate of aeration tube aeration adjustable, can adopt intermittent aeration or continuous aeration; Air water smaller (1-3) when warm season, gas-water ratio large (3-6) when dead season, gas-water ratio refers to the ratio of aeration rate and former water flooding quantity volume.
Elevation of water surface in water level regulator major control downstream wetland, its regulation range minimum is 100mm, maximum is no more than the wetland bed body significant depth of downstream; By regulating elevation of water surface, can control the dwell time of sewage in downstream wetland, guarantee sewage and the abundant contact reacts of oxygen, effectively improve gas effciency; Generally, water level lower (100mm-400mm) in the wetland bed body of downstream when warm season, hydraulic detention time less (3h-9h); Otherwise, water level higher (400mm-900mm) in bed body when dead season, hydraulic detention time is large (6h-20h).
Described warm season refers to the 4-10 month in Northeast Area of China; Refer to 11-Second Year March dead season in Northeast Area of China.
The aeration tube that lay downstream wetland bottom forms aeration zone, every square metre of aeration zone, downstream wetland bottom pipe laying 0.5-2 rice, and perforate 5-20/rice on pipe, aperture is 2-5mm, tube wall bag gauze forms aeration tube.
Plant and be implanted with wetland plant in the peat composed of rotten mosses soil layer top of up stream wetland and downstream wetland, wetland plant comprises: one of reed, cattail, iris, Canna generalis Bailey or several combination.
One grid, is arranged at wetland water-in front end, and sewage, through grid pre-treatment, is removed most of foreign material and partial suspended thing, enters artificial wet land system by water-in.
Bottom in filter vat, up stream wetland, downstream wetland and water leg is equipped with evacuation port;
Connecting pipeline between aeration tube and gas blower is provided with gas meter.
Connecting pipeline between water leg and refluxing opening is provided with water pump;
Connecting pipeline between water distribution system and filter vat is provided with water pump.
The described vertical subsurface flow wetland of removing without clogging strengthening total nitrogen, mainly formed by Filter column, up stream wetland, downstream wetland, aerating apparatus, reflux etc., the feature of its technique is integrated A/O technique and artificial swamp is a kind of novel process of removing without clogging strengthening total nitrogen that is suitable for sewage disposal.
Vertical-flow wetland divides up stream wetland and downstream wetland two portions, and first sewage enter up stream wetland, enters afterwards downstream wetland.Lay aeration tube at downstream wetland bottom, by the external gas blower aeration of bed;
Sewage installs removal most suspended substances after filtration, enters up stream wetland bottom through water pump lifting, reaches the effect of water distribution uniformity by water-distributing device, avoids filler to have dead band.Up stream wetland, from bottom water distribution, from rubble one top layer, district water outlet, enters downstream wetland.Up stream wetland inside is anaerobic environment, has both been conducive to the larger molecular organics acidification reaction that is hydrolyzed, and is beneficial to again carrying out smoothly of anti-nitration reaction.Sewage enters downstream wetland, and downstream wetland bottom is laid aeration tube, and inside is aerobic environment, is conducive to organic removal, is the sufficient condition of having created of nitration reaction simultaneously.For improving the removal efficiency of total nitrogen, part downstream wetland effluent is back to filtration unit water-in, reenters up stream wetland.
Beneficial effect of the present invention:
(1) the present invention can solve the problem that denitrification efficiency of constructed wetland is low, can improve nitric efficiency 30-50%, maintains annual nitric efficiency stable;
(2) the present invention is integrated together pre-treating technology and constructed wetland device, has expanded the subject range of artificial swamp, has greatly improved unit land utilization efficiency, has reduced cost of investment and running cost;
(3) the present invention, by adding filtration unit, has effectively delayed the Wetland clogging time limit, has reduced the maintenance cost of wetland;
(4) the present invention is by adding aerating apparatus, lay pvc pipe at down flow artificial wet field filler bottom, every square metre of pipe laying 0.5-2 rice, perforate 5-20/rice on pipe, aperture is 2-5mm, by the external gas blower aeration of bed, guarantee that long-term wetland effluent ammonia nitrogen concentration is up to standard, effectively solve the unsettled problem of artificial swamp ammonia nitrogen removal frank;
(5) the present invention, by adding reflux, has significantly improved artificial swamp total nitrogen removal efficiency, improves the range of application of artificial swamp.
Accompanying drawing explanation
The vertical subsurface flow wetland system architecture schematic diagram that Fig. 1 removes without clogging strengthening total nitrogen;
Number in the figure: 1 water-in; 2 refluxing openings; 3 Filter columns; 4 filter vat; 5 evacuation ports; 6 water distribution systems; 7 up stream wetlands; 8 downstream wetlands; 9 aeration tubes; 10 rubble 2nd district; 11 rubble one district; 12 turfy soils; 13 wetland plants; 14 water legs; 15 water level regulators; 16 overflow ports; 17 gas meters; 18 gas blowers; 19 hooks; 20 lanyards.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
The vertical subsurface flow wetland system of removing without clogging strengthening total nitrogen that the present invention proposes, sewage, through grid pre-treatment, is removed most of foreign material and partial suspended thing, enters artificial wet land system by water-in 1.Sewage is removed most suspended substances and partial organic substances through Filter column 3, enters up stream wetland 7 bottoms through water distribution system 6, successively by rubble two districts 10, rubble one district 11, turfy soil 12.Enter afterwards downstream wetland 8, through turfy soil 12, rubble one district 11, rubble two districts 10, the 8 bottom water outlets of downstream wetland enter in water leg through water level regulator 15.Part water outlet is discharged through overflow port 16, and refluxing opening 2 is entered in all the other water outlets, is back in filter vat and reenters up stream wetland, carries out denitrification processing.Wherein, evenly perforate on Filter column, 4 holes are opened in each cross section, and on same cross section, between 2 holes, angle is 90 °, and hole longitudinal pitch is 10mm, and aperture is 2mm.Rubble two districts 10, rubble one district's 11 packing material sizes are followed successively by 40-60mm, 20-30mm.Aeration tube 9 is embedded in downstream wetland 8 bottom rubble two districts 10, and aeration tube 9 is by gas blower 18 aerations of wetland outside.This example aeration tube is pvc pipe, 2 meters of every square metre of pipe layings, and 10/meter of perforates on pipe, aperture is 4mm.There is the turfy soil 12 of 100mm on up stream wetland 7 and downstream wetland 8 top layers, plantation wetland plant reed 11.Operating performance demonstration, COD, SS, ammonia nitrogen removal frank are more than 90%, and nitrogen removal rate is stabilized in 80% can reach " municipal sewage plant's pollutant emission standard " one-level (A) standard with upper water-out.
Working process: sewage enters Filter column 3 by water-in 1, post 3 is removed after most suspended substances after filtration, then enters up stream artificial swamp 7 through water distribution system 6.In up stream wetland 7, sewage passes through rubble two districts 10, rubble one district 11, turfy soil 12 from the bottom up successively.Up stream wetland 7 inside are anaerobic environment, mainly carry out anti-nitration reaction, and remove part larger molecular organics by acidication.7 water outlets of up stream wetland enter downstream wetland 8, and sewage passes through turfy soil 12, rubble one district 11, rubble two districts 10 successively at downstream wetland 8.Because downstream wetland 8 bottoms are laid aerating apparatus, so nitrification ability is stronger in downstream wetland 8, most ammonia-nitrogen and organism are mainly in this removal.Afterwards, 8 water outlets of downstream wetland enter water leg through water level regulator 15.Water section in water leg discharges through overflow port, and another part enters Filter column 3 through refluxing opening 2 in proportion, after removal partial suspended thing, again enters up stream wetland 7, completes anti-nitration reaction, further removes TN.
Aeration time, aeration rate is adjustable, can adopt intermittent aeration or continuous aeration.The gas-water ratio when warm season ratio of former water flooding quantity volume (aeration rate with) less (ratio is 1-2), large (ratio is 4-5) of gas-water ratio when dead season.
Water level regulator 15, the elevation of water surface in major control downstream wetland 8, its regulation range minimum is 100mm, is 900mm to the maximum.By regulating elevation of water surface, can control the dwell time of sewage in downstream wetland, guarantee sewage and the abundant contact reacts of oxygen, effectively improve gas effciency.Water level lower (100mm-400mm) in the wetland bed body of downstream when warm season, hydraulic detention time less (3h-9h); Otherwise, water level higher (400mm-900mm) in bed body when dead season, hydraulic detention time is large (6h-20h).
Sewage of the present invention is through grid processing, first enter filtration unit and remove most suspended substances, then enter successively up stream wetland and downstream wetland, wherein up stream wetland is that anaerobic environment is beneficial to anti-nitration reaction, downstream wetland is that aerobic environment is beneficial to nitration reaction owing to adding aerating apparatus, downstream wetland effluent is back to up stream wetland water-in in proportion, whole technique combines traditional A/O technique with artificial swamp, form a kind of novel process of the non-blocking highly effective removing total nitrogen that applies to sewage disposal.Native system can effectively reduce wetland water inlet concentration of suspension, greatly improves the total nitrogen of artificial swamp and removes ability, and floor space is little, and anti impulsion load ability is strong, wetland long service life.
Claims (9)
1. the vertical subsurface flow wetland system of removing without clogging strengthening total nitrogen, is characterized in that:
Comprise Filter column (3), up stream wetland (7) and downstream wetland (8);
Described Filter column (3) is the filtration unit that column, hollow, cylinder are evenly opened aperture from top to bottom, opens each cross section of aperture and along the circumferential direction open 4-8 hole on Filter column, and hole longitudinal pitch is 10-20mm, and aperture is 2-3mm;
Filter column is placed in filter vat (4), is provided with sewage inlet (1) and refluxing opening (2) in Filter column bottom, and sewage after filtration post is removed most suspended substances and partial organic substances, and water flows in filter vat by uniform small pores on Filter column;
Bottom in up stream wetland (7) is provided with water distribution system (6), the water inlet of water distribution system is connected with filter vat by pipeline, and up stream wetland is provided with rubble 2nd district (10), rubble one district (11), the peat composed of rotten mosses soil layer (12) of stratiform from bottom to up successively; Described water distribution system (6) is made up of water distribution supervisor and arm, and arm is connected with supervisor in supervisor's zygomorphy, the even perforate of each arm, and aperture is at 3-5mm;
Downstream wetland (8) is provided with peat composed of rotten mosses soil layer (12), rubble one district (11), rubble 2nd district (10) of stratiform from top to bottom successively; The peat composed of rotten mosses soil layer (12) of up stream wetland (7) and downstream wetland (8) is connected by pipeline;
Downstream wetland (8) bottom is equipped with aeration tube (9), and aeration tube is connected with the air outlet of the outer gas blower (18) of wetland;
Downstream wetland (8) bottom is provided with rising pipe, rising pipe stretches in water leg (14), rising pipe place in water leg (14) is connected with a water level regulator (15), in water leg (14), water is in proportion through return line, enter refluxing opening (2), reenter further removing total nitrogen of up stream wetland (7);
Described water level regulator (15) comprises a flexible pipe, lanyard (20) and hook (19), flexible pipe one end is connected with rising pipe, the flexible pipe the other end is provided with lanyard (20), be provided with hook (19) in the inner side-wall of water leg (14), lanyard (20) is fastened and is placed on hook (19) above, by adjusting the height of the length of lanyard (20) and/or the water side of the height-adjustable flexible pipe of hook (19) in water leg (14); Be provided with overflow port (16) in the sidewall of water leg (14), water leg (14) is connected with refluxing opening (2) by pipeline.
2. vertical subsurface flow wetland according to claim 1, is characterized in that: the layered fillers district packing height ratio in up stream wetland (7) and downstream wetland (8) is: the effective length ratio of peat composed of rotten mosses soil layer, rubble one district, rubble two San Zhong packing areas, district is (1-2): (6-8): (1-2);
Wherein, in rubble 2nd district, the rubble packing material size of filling is greater than the rubble packing material size loading in rubble one district.
3. vertical subsurface flow wetland according to claim 1, is characterized in that:
Adopt aeration time, the aeration rate of aeration tube aeration adjustable, can adopt intermittent aeration or continuous aeration; Air water smaller (1-3) when warm season, gas-water ratio large (3-6) when dead season, gas-water ratio refers to the ratio of aeration rate and former water flooding quantity volume; Described warm season refers to the 4-10 month in Northeast Area of China; Refer to 11-Second Year March dead season in Northeast Area of China.
4. according to the vertical subsurface flow wetland described in claim 1 or 3, it is characterized in that:
Elevation of water surface in water level regulator major control downstream wetland, its regulation range minimum is 100mm, maximum is no more than the wetland bed body significant depth of downstream; By regulating elevation of water surface, can control the dwell time of sewage in downstream wetland, guarantee sewage and the abundant contact reacts of oxygen, effectively improve gas effciency; Generally, water level 100mm-400mm in the wetland bed body of downstream when warm season, hydraulic detention time 3h-9h; Otherwise, water level 400mm-900mm in bed body when dead season, hydraulic detention time 6h-20h.
5. vertical subsurface flow wetland according to claim 1, is characterized in that:
The aeration tube (9) that lay downstream wetland (8) bottom forms aeration zone, every square metre of aeration zone, downstream wetland (8) bottom pipe laying 0.5-2 rice, and perforate 5-20/rice on pipe, aperture is 2-3mm, tube wall bag gauze forms aeration tube.
6. vertical subsurface flow wetland according to claim 1, is characterized in that:
Plant and be implanted with wetland plant (13) in the peat composed of rotten mosses soil layer top of up stream wetland (7) and downstream wetland (8), wetland plant comprises: one of reed, cattail, iris, Canna generalis Bailey or several combination.
7. vertical subsurface flow wetland according to claim 1, is characterized in that:
One grid, is arranged at wetland water-in front end, and sewage, through grid pre-treatment, is removed most of foreign material and partial suspended thing, enters artificial wet land system by water-in.
8. vertical subsurface flow wetland according to claim 1, is characterized in that:
Bottom in filter vat (4), up stream wetland (7), downstream wetland (8) and water leg (14) is equipped with evacuation port (5);
Connecting pipeline between aeration tube and gas blower (18) is provided with gas meter (17).
9. vertical subsurface flow wetland according to claim 1, is characterized in that:
Connecting pipeline between water leg (14) and refluxing opening (2) is provided with water pump; In water leg (14), water is that 1-5 refluxes through return line by water inlet with the volume ratio of the backflow water yield;
Connecting pipeline between water distribution system and filter vat is provided with water pump.
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| CN103449608B (en) * | 2013-07-19 | 2014-12-03 | 合肥工业大学 | Novel vertical flow automatic aeration annular artificial wetland system |
| CN104030440B (en) * | 2014-06-17 | 2016-02-17 | 哈尔滨工业大学 | A kind of multithread state strengthening composite under-current artificial wetland system and using method thereof |
| CN104773910B (en) * | 2015-03-31 | 2016-08-10 | 天津大学 | Combined Constructed Wetland Based on Solar Aeration and Intermittent Aeration |
| CN107529521A (en) * | 2017-08-26 | 2018-01-02 | 上海轩浦净化科技有限公司 | A kind of waste water treating and reutilizing system and method |
| CN110063168B (en) * | 2019-04-28 | 2023-12-29 | 武汉市安友科技有限公司 | Green planting device |
| CN111470631A (en) * | 2020-05-20 | 2020-07-31 | 兰州交通大学 | Constructed wetland system and method for tail water treatment of sewage treatment plant |
| CN112174320A (en) * | 2020-09-24 | 2021-01-05 | 贵州润鸿环保科技有限公司 | A Microdynamic Backflow Underflow Constructed Wetland Sewage Treatment System |
| CN114804535B (en) * | 2022-05-12 | 2023-07-04 | 中国科学院水生生物研究所 | Ecological treatment device and method for improving biological safety of biochemical tail water in fine phosphorus chemical industry park |
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| US5772887A (en) * | 1997-03-28 | 1998-06-30 | Lockheed Martin Idaho Technologies Company | Modular bioreactor for the remediation of liquid streams and methods for using the same |
| CN100497207C (en) * | 2007-01-19 | 2009-06-10 | 天津市水利科学研究所 | Backwash, aeration type undercurrent wetland water body purification apparatus and water body purification method |
| CN101120661B (en) * | 2007-09-13 | 2011-08-17 | 中国科学院水生生物研究所 | Ecological fishery cultivating device based on composite vertical current artificial wet land |
| KR100977996B1 (en) * | 2008-03-24 | 2010-08-25 | 주식회사 에코탑 | Sewage Treatment Facility Using Artificial Wetland |
| US8021551B2 (en) * | 2008-03-27 | 2011-09-20 | Mark Harrison | Eco-treatment system |
| CN101423297B (en) * | 2008-11-24 | 2010-10-06 | 中国科学院水生生物研究所 | Composite vertical current artificial wetland oxygenation system |
| CN101503266B (en) * | 2009-03-06 | 2011-06-08 | 中国科学院水生生物研究所 | Biological-ecological combined method and apparatus for purifying sewage |
| CN101987760B (en) * | 2009-07-31 | 2012-06-27 | 辽宁北方环境保护有限公司 | Horizontal underflow constructed wetland capable of strengthening denitrification at low temperature |
| CN102153234B (en) * | 2011-03-04 | 2012-08-29 | 南昌大学 | Serial drop water composite wetland system for treating non-point pollution |
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