CN102515413B - Sewage treatment system and treatment method of composite horizontal undercurrent constructed wetland - Google Patents

Sewage treatment system and treatment method of composite horizontal undercurrent constructed wetland Download PDF

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CN102515413B
CN102515413B CN 201110370614 CN201110370614A CN102515413B CN 102515413 B CN102515413 B CN 102515413B CN 201110370614 CN201110370614 CN 201110370614 CN 201110370614 A CN201110370614 A CN 201110370614A CN 102515413 B CN102515413 B CN 102515413B
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wetland
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CN102515413A (en
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崔理华
楼倩
郑离妮
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South China Agricultural University
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South China Agricultural University
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Abstract

The invention discloses a sewage treatment system and treatment method of a composite horizontal undercurrent constructed wetland. The main treatment units of the treatment system comprise a first-grade horizontal undercurrent wetland treatment unit and a second-grade horizontal baffling wetland treatment unit which are connected in series, wherein the first-grade horizontal undercurrent wetland treatment unit is provided with a vertical current nitrification band. By adopting the sewage treatment system and treatment method to treat sewage, most of sands and suspending particulate matters in the sewage are removed in a primary sedimentation basin, and then the sewage automatically flows into the nitrification band; part of sands and suspending particulate matters are removed by nitrification band treatment, so that chemical oxygen demand and five-day biochemical oxygen demand are reduced, and the nitrification of wastewater is carried out; partial total nitrogen, total phosphorus and suspended matters are removed by utilizing the horizontal undercurrent constructed wetland of the first-grade treatment unit, so that the chemical oxygen demand and the five-day biochemical oxygen demand are reduced; and a final treatment removal function is completed by utilizing the second-grade horizontal baffling wetland treatment unit. The treatment system disclosed by the invention is low in treatment cost, small in occupied area and good in nitrogen removal and phosphorous removal effects, and the chemical oxygen demand and five-day biochemical oxygen demand of the sewage can be obviously reduced.

Description

The system of compound horizontal Surface Constructed Wetlands Treating Wastewater and treatment process
Technical field
The invention belongs to technical field of sewage, be specifically related to a kind of system and treatment process of compound horizontal Surface Constructed Wetlands Treating Wastewater.
Background technology
Horizontal drowned flow artificial wet land is the artificial swamp type of present more employing, and sewage enters wetland from an end,, flows out from the other end lentamente via the matrix space in the bed body in the horizontal flow mode.In whole flow process, sewage can be purified under the combined action of aerobic, anoxic and anaerobic zone.In this system, sewage is in wetland bed internal flow, can take full advantage of on the one hand the microbial film of stromal surface growth, abundant root system of plant and veneer of soil and matrix and the effect such as hold back, to improve its treatment effect and processing power; On the other hand since current on the earth's surface with current downflow, so have heat retaining property better, little, the sanitary condition for the treatment of effect climate impact characteristics preferably.
There are some researches show that the detergent power that subsurface constructed wetland is higher mainly is to rely on the effective air permeability of soil, to COD, BOD 5, NH 4 +The removal ability of-N and SS is higher.At present, the type wetland is widely used in processing sanitary sewage, trade effluent, rural sewage and storm runoff.The weak point of its existence has: (1) because entire system is in anaerobism or anoxic condition, oxygenation capacity is lower.Dissolved oxygen in the water inlet has been consumed to very low level in that the bed body is latter half of, and good nitrification envrionment conditions can not be provided, and can not produce a large amount of nitrate as the substrate of denitrification, makes nitrated-denitrification approach not smooth, has limited nitrogen removal rate.(2) needed carbon source can not get the removal effect that sufficient assurance has further suppressed total nitrogen in the denitrification process.(3) current contact insufficiently with root arteries and veins matrix, and phosphor-removing effect is not bery desirable.
Summary of the invention
In order to overcome the deficiency of existing sewage horizontal drowned flow artificial wet land treatment process, primary and foremost purpose of the present invention provides that a kind of processing cost is low, floor space is little, the system of the compound horizontal Surface Constructed Wetlands Treating Wastewater of good denitrification dephosphorization effect.
Another object of the present invention provides the method for compound horizontal Surface Constructed Wetlands Treating Wastewater.
Purpose of the present invention realizes by following technical proposals:
The invention provides a kind of compound horizontal drowned flow artificial wet land treatment system, comprise waste pipe, preliminary sedimentation tank and rising pipe, also comprise first step horizontal subsurface flow wetland processing unit and second stage horizontal baffling stream wetland processing unit; Described first step horizontal subsurface flow wetland processing unit and second stage horizontal baffling stream wetland processing unit comprise a body, water distributor and treatment media; Described first step horizontal subsurface flow wetland processing unit is spaced apart the nitrated band of vertical-flow wetland and horizontal drowned flow or plug-flow wetland two portions by the escapement of porous, and two portions all are respectively equipped with treatment media; The water distributor of first step horizontal subsurface flow wetland processing unit is arranged at the upper layer of the nitrated tape handling medium of vertical-flow wetland;
Described preliminary sedimentation tank is connected by the water distributor of waste pipe with first step horizontal subsurface flow wetland processing unit, and first step horizontal subsurface flow wetland links to each other by the porous escapement with second stage horizontal baffling wetland; Second stage horizontal baffling wetland processing unit connects rising pipe;
Be provided with some choking walls in the horizontal baffling wetland processing unit of the described second stage;
The treatment media of the nitrated band of described vertical-flow wetland is that bottom to the top near water distributor from the bed body is respectively aluminium ore slag blanket, metalling and medium-sand seam;
The treatment media of described horizontal drowned flow or plug-flow wetland is upwards to be followed successively by from bed body bottom to be that metalling, top are medium-sand seam;
Treatment media in the horizontal baffling artificial swamp processing unit of the described second stage is rubble.
The water distributor of described first step horizontal subsurface flow wetland processing unit comprises that water distribution supervisor and water distribution branch pipe form, and become " king " font; The water distribution supervisor is distributed in the centre of nitrated band, and its length is suitable with this body length, and the both sides that an end of water distribution branch pipe is fixed on the water distribution supervisor is communicated with the water distribution supervisor, the other end sealing, and its length is half of bed body width.Water distributor and water distribution branch pipe evenly have aperture downwards.
Preferably, described water distributor is distributed in the following 10cm place, treatment media surface of the nitrated band of vertical-flow wetland.
The nitrated band of described vertical-flow wetland is higher than horizontal drowned flow or plug-flow wetland, is provided with drop between the two, and described drop is in order to make nitrated top layer with artificial swamp be in aerobic state, to be conducive to remove organism, dephosphorization and realization to the nitrification of sewage.Preferably, be provided with the drop of 40~60cm between the two.
Preferably, the aluminium ore slag blanket height in the nitrated tape handling medium of described vertical-flow wetland is 10cm; The rubble diameter is 0.5~4cm, and the rubble floor height is 40cm; Described medium coarse sand floor height 80cm.
Preferably, in the treatment media of described horizontal drowned flow or plug-flow wetland, the rubble floor height is that 20cm, rubble diameter are 3~5cm; Described medium-sand seam height is 50cm.
Preferably, the particle diameter of the treatment media rubble of described second stage horizontal baffling artificial swamp processing unit is 3~5cm.
Preferably, plant cyperus alternifolius in the described first step horizontal drowned flow artificial wet land.Plant Canna generalis Bailey in the horizontal baffling artificial swamp of the described second stage.Perhaps, plant Canna generalis Bailey in the described first step horizontal drowned flow artificial wet land; Half plantation papyrus in the horizontal baffling artificial swamp of the second stage, half plants cyperus alternifolius.Utilize the plant action of cyperus alternifolius and Canna generalis Bailey to remove nitrogen and phosphorus partly.
Based on said system, the present invention provides a kind of method of disposing of sewage simultaneously, comprises the steps:
(1) sewage is removed most of sand grains and suspended particulate matter through preliminary sedimentation tank;
(2) sewage self-flowing after step (1) is processed enters the water distributor water distribution uniformity of first step horizontal subsurface flow wetland processing unit in the nitrated tape handling medium of its vertical-flow wetland, remove part sand grains and suspended particulate matter chemical oxygen demand (COD) and five-day BOD, and carry out the nitrification of waste water;
(3) sewage through the nitrated band of vertical-flow wetland flows into horizontal drowned flow or plug-flow wetland by the porous escapement, carry out the filtration treatment first time, remove most of total nitrogen, total phosphorus and suspended substance, reduce chemical oxygen demand (COD) and five-day BOD, finish the part denitrification;
(4) sewage after step (3) is processed flows into horizontal baffling artificial swamp unit, the second stage by the porous escapement, carry out the filtration treatment second time, again remove part total nitrogen, total phosphorus and suspended substance, reduce chemical oxygen demand (COD) and five-day BOD, again finish the part denitrification, the current after the processing are discharged by rising pipe.
The main treating part of whole compound horizontal subsurface flow constructed wetland system be three grades stepped.First step ladder is nitrated band, and second stage ladder is horizontal drowned flow artificial wet land, and third stage ladder is the horizontal baffling artificial swamp.Sewage enters preliminary sedimentation tank by the sump pump lifting first and removes sand grains and suspended particulate matter after pump well is collected, then process through first step horizontal drowned flow (plug-flow) the wetland processing unit and second stage horizontal drowned flow (baffling) the wetland processing unit that are provided with nitrated band successively.Sewage is evenly batched nitrated being with at first step wetland unit at the nitrated band top of first step horizontal drowned flow artificial wet land via " king " font water distributor on, then the diafiltration by treatment media reaches nitrated purpose, then the percolation treatment by treatment media enter first step horizontal subsurface flow wetland processing unit horizontal drowned flow or plug-flow wetland, flow freely into second stage horizontal baffling artificial swamp processing unit through the sewage after the first step horizontal drowned flow processing unit processes by pigeon-holed wall, through the percolation treatment for the treatment of media, discharge by rising pipe at last.
The nitrated band (vertical current constructed wetland) that arranges in the upper end of first step horizontal subsurface flow wetland forebody can increase the dissolved oxygen of raw waste water (raw sewerage), be conducive to finishing of nitrification, in the horizontal baffling artificial swamp of the second stage, increase the design of choking wall, current are by the water stream channel of " S " type, can prolong the distance of current, sewage fully contacts with treatment media again, and aerobic environment is provided.
Preferably, being designed to of choking wall in the horizontal baffling wetland of the second stage: the choking wall pigeon-holed wall that is arranged at apart between first step horizontal drowned flow processing unit and the second stage horizontal baffling artificial swamp processing unit that staggers respectively is 2 meters, 4 meters and 6 meters, choking wall is preferably dimensioned to be: be spaced apart 2 meters between the 750cm * 20cm * 65cm, two choking walls.
The effect of first step horizontal drowned flow artificial wet land mainly is good oxygen organic, suspended substance and the total phosphorus of removing part, and sewage is carried out nitrification, carries out the denitrification of part and removes the part total nitrogen.The effect of second stage horizontal baffling artificial swamp mainly is to remove most good oxygen organic, suspended substance and total phosphorus and sewage is carried out the nitrification and denitrification effect.
Organism and denitrogenation method are in the described compound horizontal drowned flow artificial wet land processing canal reactor: horizontal subsurface flow wetland and horizontal baffling wetland are connected, increase the nitrated band of a vertical current at first step horizontal drowned flow artificial wet land front end, significantly the aerobic environment of enhanced level undercurrent is conducive to finishing of nitrification.
After sewage enters preliminary sedimentation tank removal part SS (suspended substance of sand grains and larger particles) by water pump lifting first, then gravity flow enters the water distributor of nitrated band (vertical current constructed wetland) by " king " font and carries out water distribution uniformity, through after the nitrated tape handling, remove part SS, COD, BOD 5And carry out the nitrification of waste water, then flow to the horizontal subsurface flow wetland unit by pigeon-holed wall, utilize horizontal drowned flow artificial wet land to finish organic most of the removal and the part denitrification, then flow into secondary horizontal baffling wetland unit by pigeon-holed wall, choking wall has effectively increased the distance of current, Wetland Substrate is reached to greatest extent utilize, and finishes by the absorption of denitrification and waterplant etc. the part of nitrogen is removed.
The phosphorus method is in the described compound horizontal subsurface flow constructed wetland system removal canal reactor: utilize the technical process of above-mentioned organism and denitrogenation method, finish the removal to Phosphorus From Wastewater when removing organism and denitrogenation.Concrete grammar is: filling in compound horizontal subsurface flow constructed wetland system has certain adsorbing processing matrix to phosphorus.Be specially: in described first step horizontal drowned flow artificial wet land and nitrated band thereof, fill rubble, aluminium ore slag and medium coarse sand, in the horizontal baffling artificial swamp of the described second stage, fill the rubble of different-grain diameter, the stifled choking wall of in the horizontal baffling four has prolonged water flow distance, has improved the utilization ratio of matrix.Utilize the sorption of the effect of compound horizontal subsurface flow constructed wetland system mesostroma and wetland plant (first step horizontal drowned flow artificial wet land is cyperus alternifolius, and second stage horizontal baffling artificial swamp is Canna generalis Bailey) can effectively remove phosphorus in the sewage.
The present invention transforms traditional horizontal drowned flow, sets up a nitrated band at first step horizontal subsurface flow wetland, to increase the nitrification of nitrogen; Second stage wet land system is designed to the horizontal baffling wet land system, thus the aerobic environment of enhanced level undercurrent and to the utilization ratio of matrix.
The method of the invention can be applicable to Treating Municipal Sewage and sanitary sewage and with the sewage of municipal effluent and the similar water quality of sanitary sewage, and canal reactor.
The present invention compared with prior art, the present invention has following advantage and beneficial effect:
(1) the present invention creatively comprises that to the Constitution Elements of the bulk treatment system of sewage design like three layers of ladder, treatment media etc. are optimized according to the characteristics of sewage current and fluid mechanics principle etc., constantly sum up and the analysis experimental result, obtained good treatment system and the treatment process of final effect.The present invention utilizes first step horizontal drowned flow artificial wet land to remove part TN (total nitrogen), TP (total phosphorus), COD (chemical oxygen demand (COD)), BOD 5(five-day BOD), SS (suspended substance) utilize second stage horizontal baffling artificial swamp to finish COD, BOD 5, SS and TP part remove function.The nitrated band of first step horizontal drowned flow front end setting has promoted the nitrification of nitrogen, promotes the carrying out of first step horizontal drowned flow artificial wet land system denitrification, further improves the removal effect of total nitrogen.The distance that second stage horizontal baffling wetland has prolonged current takes full advantage of matrix and plant, and also the corresponding whole system that greatly improved is to BOD 5Removal ability with COD.
(2) in compound horizontal drowned flow artificial wet land, sewage is " S " type and flows in secondary horizontal baffling unit, the distance that has prolonged in the horizontal direction current, therefore, sewage can utilize filtration, absorption and the chemical action of matrix to process TP fully, so that its concentration reduces rapidly.The cyperus alternifolius of planting in the system and the sorption of Canna generalis Bailey can make stable compound horizontal subsurface flow constructed wetland system that the clearance of phosphorus is reached more than 70%.And the TP concentration in the processing water outlet has reached municipal sewage plant's first discharge standard all less than 1mg/L.
(3) adopt the mixed-matrix of aluminium ore slag, rubble and medium coarse sand not only to keep the good dephosphorization basis of aluminium ore slag, and the porosity that has reduced matrix owing to the medium coarse sand composition that adds increased the interception capacity of matrix to pollution substance, significantly reduced in addition the generation that matrix hardens and chokes water phenomenon.
Description of drawings
Fig. 1 is compound horizontal subsurface flow constructed wetland system process flow sheet;
Fig. 2 is compound horizontal subsurface flow constructed wetland system orthographic plan;
Fig. 3 is compound horizontal subsurface flow constructed wetland system sectional view.
Embodiment
The present invention is described in further detail below in conjunction with specific embodiment and accompanying drawing, the thought that embodies mentality of designing of the present invention can not be given unnecessary details one by one at this, but embodiments of the present invention is not limited to this.
Embodiment 1
As shown in Figure 2, the compound horizontal drowned flow artificial wet land treatment system of the present invention is comprised of " with first step horizontal subsurface flow wetland unit 1 and the second stage horizontal baffling stream wetland unit of nitrated band " two portions of series connection.
Shown in accompanying drawing 1, accompanying drawing 2 and accompanying drawing 3, sewage is with 13 by water pump lifting to the nitrated of one-level horizontal subsurface flow wetland unit front end, sewage is evenly batched in nitrated band via " king " font water distributor at nitrated band top, then process by the diafiltration for the treatment of media, flow into horizontal drowned flow artificial wet land 14 through the sewage after the nitrated tape handling by pigeon-holed wall.Utilize adsorptivity and the water movement of matrix, the sewage after processing through first step horizontal drowned flow flows freely into horizontal baffling artificial swamp unit, the second stage 2 by pigeon-holed wall, through the percolation treatment for the treatment of media, discharges by rising pipe at last.
Compound horizontal subsurface flow constructed wetland system is comprised of bed body and PVC water distributor, treatment media, and the bed wall of bed body is made with non-leakage material, and the bed wall is the brick structure of finishing cement, and the bottom is concrete structure.
The nitrated band size of compound horizontal subsurface flow constructed wetland system is: long is 300cm, and wide is 800cm, and height is 130cm.First step horizontal subsurface flow wetland bed body volume is 400cm * 800cm * 70cm, and second stage horizontal baffling bed body volume is for being 800cm * 800cm * 65cm, and whole system all is the brick structure finishing cement.The matrix of filling is specific as follows: be the thick aluminium ore slag of 10cm bottom the nitrated band, be covered with successively the thick rubble of 40cm (d=0.5~4cm), the medium coarse sand that 80cm is thick on it; (d=3~5cm), upper strata are the medium coarse sand of 50cm for the thick rubble of 20cm for first step horizontal subsurface flow wetland bottom; Treatment media in the horizontal baffling wetland of the second stage is the rubble of d=3~5cm.
Being designed to of choking wall in the horizontal baffling wetland of the second stage: the choking wall pigeon-holed wall that is arranged at apart between first step horizontal drowned flow processing unit and the second stage horizontal baffling artificial swamp processing unit that staggers respectively is 2 meters, 4 meters and 6 meters, choking wall is preferably dimensioned to be: be spaced apart 2 meters between the 750cm * 20cm * 65cm, two choking walls.
In nitrated band and one-level horizontal drowned flow artificial wet land bed body, plant the plant cyperus alternifolius that is implanted with stronger absorption of nutrient ingredients effect, plantation safflower Canna generalis Bailey in the horizontal baffling artificial swamp matrix.
Water distributor adopts the PVC material, is distributed in following 10cm place, hypothallus surface.The length of PVC water distribution supervisor pipe is suitable with the bed body length, wherein end sealing, and the other end links to each other with water inlet pipe.Water distribution supervisor and arm are distributed in the centre of nitrated band, are " king " font and distribute.The both sides that one end of water distribution branch pipe is fixed on the water distribution supervisor is communicated with the water distribution supervisor, the other end sealing, and water distributor and water distribution branch pipe evenly have aperture downwards.
Water distribution supervisor at first step horizontal drowned flow artificial wet land is equipped with water control valve door and water meter, utilizes the water inlet of the acting in conjunction control artificial swamp of valve and water meter, and then the hydraulic load of control whole system.
Management mode: compound horizontal subsurface flow constructed wetland system has been tried 8 months (in January, 2009~May, 7~November) altogether out.Beginning two months is the starting period, presses hydraulic load (HRL)=0.8m 3/ (m 2D), operation in per 2 days once and is got raw waste water and water quality analysis is done in water outlet.
The sewage that present embodiment is processed is Dongguan Canal sewage, and this canal is being born the Dongguan City city and drained off floodwaters and admit the sewage discharge function, and part section water quality is severe exacerbation, and the water body blackening is smelly.Compound horizontal subsurface flow constructed wetland system is built according to the river, and sewage enters system by water pump lifting.Water quality monitoring (WQM) is the result show, the COD concentration of sewage between 26.88~260.92mg/L, BOD 5Concentration is between 8.79~36.32mg/L, and TP concentration is between 0.47~1.79mg/L.
The process that employing the present invention processes above-mentioned sewage is as follows: Dongguan Canal sewage directly promotes the nitrated band that enters first step horizontal drowned flow artificial wet land unit front end by water pump, sewage is evenly batched matrix at nitrated band at the top of nitrated band via water distributor in, sewage is through hypothallus, because the filtration of matrix is held back to finish with the picked-up effect of adsorption and root system of plant the part of oxygen consumption organic and TP is removed, simultaneously because the bed body is in undersaturated condition, oxygen enters wetland by atmospheric diffusion and plant transmission, is conducive to sewage and finishes nitrification in nitrated band; Then sewage enters the one-level horizontal subsurface flow wetland by pigeon-holed wall, fully contact with plant with matrix (treatment media), finish the denitrification of most of organic matter removal and part, then current flow into secondary horizontal baffling wetland unit by pigeon-holed wall, four stifled choking walls are arranged in this unit, thereby improve the utilization ratio of matrix and plant with the distance that prolongs current, reach good nitrogen phosphorus removal effect, last current are discharged by rising pipe.
Present embodiment system treatment effect (mg/L, %) is shown in table 1, table 2 and table 3.Table 1, table 2 and table 3 are respectively Dongguan Canal sewage after compound horizontal subsurface flow constructed wetland system is processed, the COD in the sewage, BOD 5With TP change in concentration situation.
Embodiment 2
In the present embodiment, the sewage that enters wet land system in advance carries out coagulation (the mixed reaction of conventional dosing and precipitation process) through camphor tree village Sewage Plant, and then enters wet land system and further purify.
System treatment effect (mg/L, %) is shown in table 1, table 2, table 3 and table 4 in the present embodiment.Table 1, table 2, table 3, table 4 are respectively through the canal reactor of coagulation again after compound horizontal subsurface flow constructed wetland system is processed, the COD in the sewage, BOD 5, TP, NH4 +-N, TN change in concentration situation.
Embodiment 3
In the present embodiment, utilize compound horizontal drowned flow artificial wet land to process to community's life's sewage in Zhuhai Shang Zhou village.
The first step system design size length * wide * height of compound horizontal drowned flow artificial wet land is 6m * 3m * 0.8m, water outlet water level 0.65m, and wetland processing unit size length * wide * height in the second stage is 6m * 3m * 0.7m, water outlet water level 0.5m.Compound horizontal drowned flow secondary tank size length * wide * height is 1m * 1.3m * 0.6m, and the one-level tank size length * wide * height of Compound Water advection is 3m * 0.5m * 0.7m.
The matrix that compound horizontal drowned flow is filled is the different rubble of particle diameter, and the order of filling up is covered with successively from the bottom, pond: the rubble of the rubble of 5cm particle diameter 40~50mm, 5cm particle diameter 20~40mm, the rubble of 5cm particle diameter 10~20mm, 15cm up fills out the rubble of particle diameter 5~10mm to the top, pond at the bottom of the pond.
Three kinds of different pattern Canna generalis Baileys of first step processing unit plantation in the compound horizontal drowned flow system, half plantation papyrus of second stage processing unit, half plants cyperus alternifolius.
Operation scheme: this system built up in December, 2009, and commencement of commercial operation so far after the system trial run two weeks time.Adopt intermittent pour water and the submersible pump of floating ball lever meter control start and stop is poured water, it is the highest to differ 1.15m with lowest water level.
Water quality monitoring (WQM) is the result show, the COD concentration of sewage between 2.61~61.64mg/L, BOD 5Concentration between 14.78~58.42mg/L, TP concentration between 0.05~4.36mg/L, TN concentration between 1.01~44.14mg/L, NH 4 +-N concentration is between 0~42.83mg/L.
Compound horizontal drowned flow is to COD, BOD 5, NH 4 +The average removal rate of-N, TN and TP is respectively 66.74%, 63.71%, 34.12%, 34.89% and 45.23%, compound horizontal drowned flow system processes that COD and TN reach urban wastewater treatment firm pollutant emission standard (GB18918-2002) primary standard A standard, BOD in the water outlet 5Concentration reach urban wastewater treatment firm pollutant emission standard (GB 18918-2002) primary standard B standard, NH 4 +The concentration of-N and TP all reaches urban wastewater treatment firm pollutant emission standard (GB18918-2002) secondary standard.
Present embodiment system treatment effect (mg/L, %) is as shown in table 5.Table 5 is Shang Zhou village sanitary sewage after compound horizontal subsurface flow constructed wetland system is processed, the COD in the sewage, BOD 5, TP, NH 4 +-N and TN change in concentration situation.
Table 1 canal reactor is COD change in concentration situation (mg/L) after compound horizontal subsurface flow constructed wetland system is processed
Table 2 canal reactor is BOD after compound horizontal subsurface flow constructed wetland system is processed 5Change in concentration situation (mg/L)
Table 3 canal reactor is TP change in concentration situation (mg/L) after compound horizontal subsurface flow constructed wetland system is processed
The change in concentration situation of table 4 canal reactor nitrogen after compound horizontal subsurface flow constructed wetland system is processed
Table 5 sanitary sewage is each pollutent index change in concentration situation after compound horizontal subsurface flow constructed wetland system is processed
Above-described embodiment is the better embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.

Claims (10)

1. a compound horizontal drowned flow artificial wet land treatment system comprises waste pipe, preliminary sedimentation tank and rising pipe, characterized by further comprising first step horizontal subsurface flow wetland processing unit and second stage horizontal baffling wetland processing unit; Described first step horizontal subsurface flow wetland processing unit and second stage horizontal baffling wetland processing unit comprise a body, water distributor and treatment media; Described first step horizontal subsurface flow wetland processing unit is spaced apart the nitrated band of vertical-flow wetland and horizontal drowned flow or plug-flow wetland two portions by the escapement of porous, and two portions all are respectively equipped with treatment media; The water distributor of first step horizontal subsurface flow wetland processing unit is arranged at the upper layer of the nitrated tape handling medium of vertical-flow wetland;
Described preliminary sedimentation tank is connected by the water distributor of waste pipe with first step horizontal subsurface flow wetland processing unit, and first step horizontal subsurface flow wetland processing unit links to each other by the porous escapement with second stage horizontal baffling wetland processing unit; Second stage horizontal baffling wetland processing unit connects rising pipe;
Be provided with some choking walls in the horizontal baffling wetland processing unit of the described second stage;
The treatment media of the nitrated band of described vertical-flow wetland is that bottom to the top near water distributor from the bed body is respectively aluminium ore slag blanket, metalling and medium-sand seam;
The treatment media of described horizontal drowned flow or plug-flow wetland is upwards to be followed successively by metalling from bed body bottom, and top is medium-sand seam;
Treatment media in the horizontal baffling artificial swamp processing unit of the described second stage is rubble.
2. described compound horizontal drowned flow artificial wet land treatment system according to claim 1, the water distributor that it is characterized in that described first step horizontal subsurface flow wetland processing unit comprises water distribution supervisor and water distribution branch pipe, the water distribution supervisor is distributed in the centre of nitrated band, the both sides that one end of water distribution branch pipe is fixed on the water distribution supervisor is communicated with the water distribution supervisor, the other end sealing, water distribution branch pipe has aperture.
3. compound horizontal drowned flow artificial wet land treatment system according to claim 1 and 2 is characterized in that described water distributor is distributed in the following 10cm place, treatment media surface of the nitrated band of vertical-flow wetland.
4. compound horizontal drowned flow artificial wet land treatment system according to claim 1 is characterized in that having between the nitrated band of described vertical-flow wetland and horizontal drowned flow or the plug-flow wetland drop of 40~60cm.
5. compound horizontal drowned flow artificial wet land treatment system according to claim 1 is characterized in that the high 10cm of being of aluminium ore slag blanket in the nitrated tape handling medium of described vertical-flow wetland; The rubble diameter is 0.5~4cm, and the rubble floor height is 40cm; Described medium coarse sand floor height 80cm.
6. compound horizontal drowned flow artificial wet land treatment system according to claim 1 is characterized in that in the treatment media of described horizontal drowned flow or plug-flow wetland, and the rubble floor height is that 20cm, rubble diameter are 3~5cm; Described medium-sand seam height is 50cm.
7. compound horizontal drowned flow artificial wet land treatment system according to claim 1 is characterized in that the particle diameter of the treatment media rubble of described second stage horizontal baffling artificial swamp processing unit is 3~5cm.
8. compound horizontal drowned flow artificial wet land treatment system according to claim 1 is characterized in that planting cyperus alternifolius in the described first step horizontal drowned flow artificial wet land processing unit; Plant Canna generalis Bailey in the horizontal baffling artificial swamp processing unit of the second stage.
9. compound horizontal drowned flow artificial wet land treatment system according to claim 1 is characterized in that planting Canna generalis Bailey in the described first step horizontal drowned flow artificial wet land processing unit; Plantation papyrus and cyperus alternifolius in the horizontal baffling artificial swamp processing unit of the second stage.
10. a method that adopts the described system of claim 1 to dispose of sewage is characterized in that comprising the steps:
(1) sewage is removed most of sand grains and suspended particulate matter through preliminary sedimentation tank;
(2) sewage self-flowing after step (1) is processed enters the water distributor water distribution uniformity of first step horizontal subsurface flow wetland processing unit in the nitrated tape handling medium of its vertical-flow wetland, remove part sand grains and suspended particulate matter chemical oxygen demand (COD) and five-day BOD, and carry out the nitrification of waste water;
(3) sewage through the nitrated band of vertical-flow wetland flows into horizontal drowned flow or plug-flow wetland by the porous escapement, carry out the percolation treatment first time, remove most of total nitrogen, total phosphorus and suspended substance, reduce chemical oxygen demand (COD) and five-day BOD, finish the part denitrification;
(4) sewage after step (3) is processed flows into second stage horizontal baffling artificial swamp processing unit by the porous escapement, carry out the filtration treatment second time, again remove part total nitrogen, total phosphorus and suspended substance, reduce chemical oxygen demand (COD) and five-day BOD, and again finish the part denitrification, the current after the processing are discharged by rising pipe.
CN 201110370614 2011-11-18 2011-11-18 Sewage treatment system and treatment method of composite horizontal undercurrent constructed wetland Active CN102515413B (en)

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CN200946117Y (en) * 2006-07-26 2007-09-12 山东大学 Reflecting flow type undercurrent artificial everglade
CN101671096A (en) * 2009-10-12 2010-03-17 东莞市华清净水技术有限公司 Method for processing sewage by multilevel vertical-current compound manual wetting ground and processing system thereof

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CN101671096A (en) * 2009-10-12 2010-03-17 东莞市华清净水技术有限公司 Method for processing sewage by multilevel vertical-current compound manual wetting ground and processing system thereof

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