CN201553667U - Sewage treatment wetland system - Google Patents

Sewage treatment wetland system Download PDF

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Publication number
CN201553667U
CN201553667U CN2009202660250U CN200920266025U CN201553667U CN 201553667 U CN201553667 U CN 201553667U CN 2009202660250 U CN2009202660250 U CN 2009202660250U CN 200920266025 U CN200920266025 U CN 200920266025U CN 201553667 U CN201553667 U CN 201553667U
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wetland
sewage treatment
water
layer
unit
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何航
陆天友
魏琛
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何航
陆天友
魏琛
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    • 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 utility model discloses a sewage treatment wetland system which comprises an adjusting pool (7), a pre-sedimentation treating pool (8), a peristaltic pump (9) and at least one wetland unit (11), wherein the adjusting pool is connected with a sewage discharge pipe; the adjusting pool (7), the pre-sedimentation treating pool (8), the peristaltic pump (9), the water inlet valve (10) and the wetland unit (11) are connected in sequence through pipelines; a water collecting pipe (12) is connected with a water outlet of the wetland unit (11); and the wetland unit (11) adopts an assembly-type packed artificial vertical undercurrent wetland unit. The sewage treatment wetland system can not only effectively prevent the blocking of wetland system, but also adjust the components of the packing of the wetland unit according to the quality of inflowing water; the maintenance of the system is very convenient, and when the system is blocked, the blocked part can be replaced timely and other wetland units are not influenced; and meanwhile, after the packing in the blocked part is replaced, the part can be reused for sewage treatment and waste is avoided.

Description

A kind of sewage treatment wetland system
Technical field:
The utility model relates to a kind of sewage treatment wetland system, especially comprises the sewage treatment wetland system of assembled packing artificial vertical subsurface flow wetland unit, belongs to technical field of sewage.
Background technology:
At present, it is more and more that artificial swamp is applied to the engineering of sewage disposal.Artificial swamp mainly is made up of wetland plant, filler, microorganism three parts, and wetland is finished removal effect to pollutent in the sewage by the synergy between the three.But, wet land system working time of a specified duration just stop up easily, cause processing efficiency to descend, effluent quality is undesirable.If untimely processing will make whole wet land system be tending towards paralysis, can't realize the cleaning action of sewage.General wet land system employing changes the obstruction that methods such as water intake mode, change filler grating delay wet land system, but its effect is not ideal.
The utility model content:
The purpose of this utility model is: a kind of sewage treatment wetland system is provided.The utility model easily stops up, changes problems such as inconvenience at general wet land system, the sewage treatment wetland system that is provided not only can effectively prevent the obstruction of wet land system, can also be according to the filler component of influent quality different adjustment wetland unit, and, when take place stopping up, also can in time change blocking portion and do not influence other wetland units.
The utility model is to constitute like this: a kind of sewage treatment wetland system, comprise equalizing tank, preliminary precipitation treating pond, peristaltic pump and at least one wetland unit, equalizing tank connects bilge discharge pipe, link to each other successively through piping between equalizing tank, preliminary precipitation treating pond, peristaltic pump, water intaking valve, the wetland unit, the water outlet of header and wetland unit joins; Described wetland unit is an assembled packing artificial vertical subsurface flow wetland unit: comprise open-topped peripheral container and five structural sheets that are placed in one, be followed successively by infiltration substrate composed plantation layer, water distribution layer, packing layer, filter layer in the peripheral container from top to bottom, layer catchments.
Water inlet place of aforementioned equalizing tank is provided with middle grid; The grizzly bar of middle grid is spaced apart 10~40mm.
The leading portion of aforementioned preliminary precipitation treating pond is provided with dusting cover; The aperture of dusting cover is 1.6mm.
Fix with clip between adjacent two wetland units, only need during replacing clip is unclamped, get final product by the lifting installation, to the not influence of processing of other parts, the normal operation of wet land system during having guaranteed to safeguard.
The bottom of preliminary precipitation treating pond is provided with 1%~2% the gradient; The bottom, slope is provided with the mud receiving tank, and trench bottom is provided with shore pipe and valve.
In order to make artificial vertical subsurface flow wetland in sewage disposal, bring into play bigger effect, make its maintenance easier, save time, laborsaving, the designer before proposing rational experimental program, taken all factors into consideration following some:
Characteristics such as 1, artificial vertical subsurface flow wetland has no surface water, floor space is little, rate of utilization is high, easy to maintenance.
2, to adjust in order being easy to, current wetland to be divided into several region, make it to constitute an integral body by linking, subregion can effectively prevent the disease and pest of wetland plant simultaneously.
3, after the subregion, can change zoning unit, make that the wetland management is convenient according to practical operation situation.
4, the assembled packing artificial wetland mainly is at community life sewage and holiday village sanitary sewage.Because these sewage water yields change greatly, can be behind the subregion according to the wetland unit number of amount of inlet water adjustment operation.
5, owing to long-time running, wet land system stops up unavoidably, and the assembled packing artificial wet land treating system can be changed blocking portion according to stopping state, and the assembled replacing is comparatively easy, and is less, easy to implement to the influence of wetland operation.
6, the zoning unit of wetland can carry out the scene according to the wetland scale and install in advance at produce in factory, and installation period is short, helps the operation of wet land system.
7, the unit that is replaced taking place to stop up can reuse no wasting phenomenon by maintenance.
Below be the main experimental study process that the designer determines technical solutions of the utility model:
1, technical process
Test technology is preliminary precipitation treating pond+artificial current wetland, that is: water inlet → equalizing tank → preliminary precipitation treating pond → water pump → artificial current wetland → water outlet
2, process object
The process object of the assembled packing artificial current wetland of the utility model design is mainly interior among a small circle sanitary sewage such as resident living sub-district and holiday village.The sanitary sewage of residential quarter and holiday village has characteristics such as change of water quality is big, water yield instability.
The mobile piecing assembly artificial wet land system that the utility model adopts can be adjusted according to the unit number of different water yield adjustment assembly units, has avoided the contradiction between design and the actual treatment amount.Portable can the adjustment according to the needs of different location such as has and effluent quality is good simple and efficient at characteristics.
3, influent quality
Because the concentration of contained pollutent is inconsistent in different holiday villages, the sanitary sewage of residential quarter, therefore experiment is handled influent quality with reference to general sanitary sewage water quality.The basic water quality situation (unit is mg/L) as shown in table 1 of general sanitary sewage.
The general sanitary sewage water quality of table 1
Leading indicator COD Cr BOD 5 SS NH 3-N TP
General sewage 250~300 100~150 150~200 30(TKN=40) 4~5
4, effluent quality
In order to prevent the pollution of the environment, artificial current wetland treat effluent water quality is according to " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) one-level B standard execution.Main effluent quality is as shown in table 2.
The table 2 water outlet basic controlling the highest permission emission concentration of project (annual average) unit: mg/L
5, the selection of wetland unit filler and water inlet, water-out manners
The type of filler and ratio are to influence one of important factor that artificial swamp disposes of sewage.Filler comprises physical filtering, ion-exchange, obligate and non-obligate absorption, sequestering action, precipitation reaction etc. to the process of holding back of pollutent.Filler is the important component part of artificial swamp, because soil permeability is poor, stops up easily, thereby forms short stream or cross flow, so the artificial swamp by filler is replaced by sandstone or mixed fillers gradually with soil merely.Adopt mixed fillers as the artificial swamp filler, caused sewage short circuit or the long-term district of filler the phenomenon of slough to occur, make that also all contaminations in the sewage obtains removal effect preferably thereby both avoided single filler life-time service may cause stopping up.In recent years, the porous medium that some permeabilities are good, specific surface area is big, have an adsorptive power also is filled in the artificial wet land system, has improved pollutent, the particularly removal effect of nitrogen phosphorus greatly.
Matrix (is the filler of each structural sheet in the wetland unit, generally constitute by soil, fine sand, coarse sand, gravel, galleting or lime-ash etc., complete by certain thickness, form bed body for plant-growth and microorganic adhesion) select for use and need usually in the process to consider following factor: (1) has good adsorption performance and ion-exchange performance, matrix mainly is to realize by some physics and chemistry (absorption, absorption, ion-exchange, complex reaction etc.) effect in the removal process of phosphorus, thereby selects the clearance important influence of suitable matrix to phosphorus.(2) particle diameter of matrix is unsuitable excessive or too small, and the hydraulic conductivity of matrix is less, results in blockage easily, forms overland flow; Particle diameter is too big, and the area that microorganism can adhere in the unit volume is less; The matrix particle size range of selecting for use at present is at 0~30mm, and usual range is 4~16mm.(3) help biomembranous formation and renewal, help improving the removal efficient of organism and nitrogen.(4) inexpensive, matrix accounts for the ratio maximum of wetland construction cost, can reach 50%~60%.
The root growth degree of depth of determining to depend on plant, processing efficiency and the reoxygenation efficient of hypothallus thickness.In order to guarantee enough oxygen is arranged in the wetland bed body for the aerobic bacteria utilization, the hypothallus thickness of wetland (being the thickness sum of each structural sheet in the wetland unit) generally is controlled between 0.6~0.8m, the hypothallus thickness of vertical-flow wetland can be thicker relatively, generally between 0.7~0.8m.The projected depth of constructed wetland bed body generally is that the degree of depth by waterplant root system natural expansion designs, and is generally 0.6~0.7m.Be advisable with 0.2~0.6m as cattail, the wetland bed degree of depth of Medulla Junci.
Vertical-flow wetland often adopts the perforated tube water inlet.The outlet system of wetland can adopt modes such as ditch row, pipe row, well array, should consider factors such as the layout of characteristics, wet land system of receiving water body and field condition during design.For effectively controlling the wetland water level, the vertical current constructed wetland water exhaust system generally is to lay the perforation header in hypothallus, and turning gland and by-pass valve control are set, and at the necessary position of system control valve and blow-off valve is set simultaneously.
The utility model current wetland mainly is made up of five parts: wetland is followed successively by from top to the bottom: the plantation layer, water distribution layer, packing layer, filter layer, layer catchments.The thickness of plantation layer is 15~25cm, and main component is that (d<2mm), its part by weight is 3: 1~4: 1 for paddy soils and fine sand.The thickness of water distribution layer is 10~15cm, and main component is a coarse sand, and particle diameter is 10~15mm.The thickness of packing layer is 20~30cm, and main component is homemade biologic packing material, and its particle diameter is at 3~5mm.The thickness of filter layer is 20~30cm, and main component is for thin paddy soils of 5mm mesh screen and the fine sand (part by weight is 3: 2~2: 1) of particle diameter 0.25~0.35mm.Catchment the layer thickness be 10~15cm, main component is a coarse sand, particle diameter is 10~15mm.The material of water distributor and header is U-PVC, and caliber is De32.The water distribution branch pipe bottom replaces even perforate, and the perforate direction is oblique following 30 °; The perforate of header arm is the even perforate of level.At filter layer and catchment and lay layer of non-woven fabric between the layer, main effect be for the soil depression that prevents filter layer to stop up header.The top superelevation of peripheral container is set to 15cm.For preventing that wet land system from causing groundwater pollution because of seepage, require when engineering construction, should keep former soil layer as far as possible, and on former soil layer, impervious barrier is set.Impervious barrier be provided with several different methods, be the high-density polyethylene resin, tar felt sealing place mat etc. of 0.5~1mm as adopting thickness, prevent the damage of a body filler wedge angle to film, can on plastics film, lay one deck fine sand in advance during construction.The high-density polyethylene resin antiseepage is adopted in this experiment.
6, the making material of wetland unit
Make the material of the peripheral container of wetland unit and preferably select glass reinforced plastic for use.Glass reinforced plastic has following characteristics:
(1) high-strength light
(2) corrosion resistance and good
(3) good electrical property
(4) thermal characteristics is good
(5) designability is good
Glass reinforced plastic can be designed various constructed products as required neatly, satisfies service requirements, can make product that good globality is arranged.
Simultaneously, as making material, can observe the water level dynamic change in the wetland unit with glass reinforced plastic.
7, the selection of plant
The plant difference, the microbe population difference, this mainly be plant rhizosphere effect in action.Root secretion is of a great variety, and quantity is different, and nascent meta-bolitess such as sugar, organic acid, amino acid are not only arranged, and also has secondary meta-bolites and some nameless meta-bolitess such as ketone phenol and amine.Act on surrounding environment and form rhizosphere (referring generally to the microbending soil of the not enough 1mm of root-pedosphere face), produce rhizosphere effect to the scope of several mm.Root secretion directly influences kind and the distributed number of rhizospheric microorganism, different plants or at the plant of different soils plantation or the kind and the different amts of same plant different developmental phases root secretion, thus affect rhizospheric microorganism selectively.Rhizospheric microorganism is to live in concentrated communities at rhizosphere soil, with root rhizosphere secreta is a group microorganism of main nutrition, root secretion provides a large amount of nutrition and energy substances for soil microorganisms, not only kind and quantity are far above non-rhizosphere plant for rhizospheric microorganism, and its metabolic activity is also than non-rhizospheric microorganism height.The existence of plant significantly increases the quantity of microorganism in the artificial wet land system such as nitrobacteria, denitrifying bacterium, phosphorus bacteria, cellulose-decomposing bacterium.
7.1 the selection of planting patterns
Wetland plant is the important factor that influences the wet land treating system effect, so its plantation/transplanting and maintenance also are the vital tasks in the plant construction.Plantation/the transplanting of wetland plant mainly comprises the transplanting of naked sprigging, seminal propagation, harvesting plant and potted plant transplanting etc.
7.2 the selection of implantation time
The Best Times of plantation wetland plant is spring or early summer in the artificial marsh sewage treatment system, and wetland plant generally begins growth at this season.This sunshine duration period is gradually long, and from the minimum that influences of assorted living plant and disease and pest, most of plants can the adaptability growth.And, beginning season of growth plantation at wetland plant, the existing competent time is grown to maturation plant, can reach effective fraction of coverage before slowing down in cold season arrival and plant growth rate again.
7.3 the selection of planting density
The planting density of wetland plant mainly requires decision by floristics, sewage disposal usefulness, wetland type, view, for waterplant, the former seems even more important, water plant planting is mainly that sheet is planted, piece is planted and group planting, sheet is planted or piece is planted and generally all needed full kind, will all cover ground (water surface) during final acceptance of construction.
7.4 the selection of wetland plant
The selection principle of constructed wetland plant:
1. detergent power is strong
Waterplant is to the BOD in the sewage 5, COD, TN, TP mainly be by apposition growth root district surface and near removal of microorganisms, so should select the relatively advanced waterplant of root system.
2. has resistance
1) diseases and insect pests resistance
Plant in the sewage ecological treatment system easily grows disease and pest, and diseases and insect pests resistance is directly connected to growth and the existence of plant self, also directly influences its decontamination effect improving in treatment system.
2) to the adaptive faculty of surrounding environment
Because the root system of plant in the artificial swamp wants long period of soaking in water and the pollutent that exposure concentration is higher and variation is bigger, therefore selected waterplant all will have good adaptive faculty to weather condition, edaphic condition and the animals and plants environment on every side of locality except durability against pollution is eager to excel.Generally should select the plant that exists in the natural wetland in locality or this area for use.
3) manageability
Management simply, conveniently is one of principal feature of artificial swamp ecological sewage treatment engineering.Detergent power is strong, resistance is similar if can filter out, and the less plant of increment will reduce in the management especially to the many troubles in the plant materials aftertreatment.
4) comprehensive utilization value height
If handled sewage does not contain poisonous, objectionable constituent, its comprehensive utilization can be considered from the following aspects: 1. make feed, generally select the waterplant of content>20% (dry weight) of crude protein.2. make fertilizer, it is higher to consider that plant materials contains effective fertilizer composition, easily decomposes.3. produce biogas, should consider to ferment, the carbon-nitrogen ratio of aerogenesis plant, the carbon-nitrogen ratio of generally selecting plant materials for use is 25~30.
5) beautify view
Because generally all near outskirts of a town, area is bigger simultaneously for the treatment system of town sewage, also be to consider so beautify view.
Alternative plant:
1. 2. 3. 4. 5. reed of Canna generalis Bailey of calamus of cattail of Medulla Junci
Select Medulla Junci and Canna generalis Bailey two kind of plant according to above principle.Two kind of plant are plantation alternately, a plantation of two plots of promptly adjacent wetlands Canna generalis Bailey, and a plantation Medulla Junci forms in picturesque disorder man-made tourist site.The planting density of Medulla Junci is 40 strains/m 2, the planting density of Canna generalis Bailey is 20 strains/m 2Adopt the seedling bare root transplanting, plant is from Guizhou Botanical Garden, and transplant time is the April.
7.5 the startup of wetland
The startup of artificial swamp is exactly to turn out suitable association of plants and animals in treatment system.The length of start time is relevant with wetland type, influent quality and season.At initial operating stage, except the factors such as adaptability of weather, plant, the bed body water level of hydraulic load and artificial swamp is the principal element that influences plant survival rate and growth thereof.Plant the initial stage at constructed wetland plant, hydraulic load is big slightly and regulate water level and reach artificial swamp and keep slight water logging, and plant-growth is very fast, and surviving rate is higher.Otherwise than the drowned flow artificial wet land of low-water level,, cause top gravel temperature filler temperature to raise, can jeopardize the existence of plant because summer temperature raises.The temperature height, the evaporation and transpiration amount is big, also can cause water level to reduce, and influences plant life.Therefore the wetland water level to be adjusted in wetland most important in starting.
For subsurface constructed wetland, during plant-growth, keep the water level of wetland of crucial importance.Constructed wetland plant reach than high-survival rate, growth stable after, also need growth channeling conduct to the constructed wetland plant root system.Common practices is to reduce constructed wetland bed body water level, under the hydrotaxis effect of roots of plants, has stimulated root system of plant to grow downwards, to satisfy the requirement of growth to water.
The a large amount of weeds particularly growth of the living weeds of shallow root drought can reduce the artificial swamp purification efficiency.Because weeds vitality is strong, may become the advantage species in the wetland initial start stage, influences the maturation of muskeg.Therefore, by regulating water level and make a surface waterflooding reduce weeds or manually pulling out and control, do not encourage use of insecticide in wetland in initial planting.
8. water intake mode
The traditional water distribution manner of artificial swamp has permanent sprinkler irrigation, movable sprinkler irrigation, basins irrigation and irrigates through furrow.In most of the cases, water distribution manner depends on local landform, soil, plant and weather condition.For the dissolved oxygen that makes artificial swamp current uniform distribution and increase wetland, the researchist has developed many novel water distribution manners.The ladder water inlet can avoid handling the anterior obstruction of bed, makes the plant growing way even, helps the nitrated denitrogenation at rear portion; Return-flow type can carry out certain dilution to water inlet, increases the dissolved oxygen in the water and reduces the stink that may occur in the water outlet, promotes the nitrification and denitrification denitrogenation in the bed of packings; Composite type then is provided with effluent recycling on the one hand, on the other hand also with the middle part of inlet distribution to bed of packings, to reduce the load of bed of packings front end.Recently, the scientific research personnel also works out a kind of radiant flux artificial swamp of novelty, and current flow to the gravel bed radially by the center of wetland, carry out the collection of water at the periphery of wetland, and this radiation streaming water distribution can improve the hydraulic conductivity of gravel matrix.
According to the water (flow) direction difference, traditional artificial swamp is divided into two kinds of parallel-flow and downstreams.Existing considerable studies show that, the biography oxygen of parallel-flow is limited in one's ability.At the bottom of the normal mode of water inlet in batches that adopts of downstream, sewage were flow to bed by surface longitudinal, after a collection of sewage passed through, a bed body was in undersaturated condition, and oxygen to the bed body, therefore, has higher aerobic treatment ability than the parallel-flow system by atmospheric diffusion.In recent years, except that parallel-flow and downstream, people have begun tide current is studied, and in this type systematic, sewage is discharged from after being full of a body gradually from the bottom to top again, and the process of draining also is the process of air reaeration.Airborne oxygen transmits into people's bed body through surface diffusion and root system of plant, and bed body top is in little oxygen environment, and when intaking, pollutent can carry out aerobic degradation again.This intermittent flow artificial swamp can be regarded as the microbial reaction system of a complexity, and the microflora that is attached to root system of plant and gravel surface carries out aerobic or anaerobic metabolism, thereby removes the pollutent in the water.
Artificial swamp can satisfy the demand of wetland plant to moisture, the operation scheme of alternation of wetting and drying more helps the growth of wetland plant, the increase of ground biomass, the increase of fibrous root and root approximate number amount, improve the oxygen therapy amount of plant, improve in the medium redox state to promote the growth of organic degraded and nitrobacteria.Operation scheme adopts the alternation of wetting and drying operation, adopts the intermittent water inflow mode.Intake the 4h of at every turn intaking, about 4h at interval every day three times.Intermittent water inflow can make full use of wetland surface and volume so that the water distribution during low hydraulic load is even.
9. equalizing tank, preliminary precipitation treating pond
The volume settings of equalizing tank is 1m 3, useful volume is 0.75m 3Hydraulic detention time 24h.The equalizing tank size is that the length of side is the cubes of 1m.Material is a glass reinforced plastic.
For preventing to stop up, pretreating zone need be set, by the preliminary precipitation effect settleable matter is removed.Based on maximum throughput, the HRT of preliminary precipitation treating pond is made as 36h.Preliminary precipitation treating pond volume is 1.25m 3, useful volume is 1.125m 3The size of preliminary precipitation treating pond: length * wide * height=1m * 1m * 1.25m.The bottom gradient is that 2%, one end is provided with the mud receiving tank, is of a size of length * wide * height=0.25m * 1m * 0.3m.Shore pipe is established in the bottom, the DN50 steel pipe, and valve is set.Simultaneously, the preliminary precipitation treating pond is provided with a dusting cover in the water inlet position, mainly is in order to suspension or floating solid matter in water or the waste water under obstruction or the removal flow state.The specification of dusting cover is the mesh screen of aperture 1.6mm, and the material of mesh screen is a stainless steel.
Because the organic composition in the sanitary sewage is easy to degraded, and suspended particle content is bigger, before the current wetland processing unit pretreating zone is set, remove the part suspended particle by natural subsidence, reduce the probability that the generation of subsequent disposal unit is stopped up.
The bed body specification of current wetland processing unit has certain influence to the processing efficiency of sewage.Generally speaking, long-width ratio is to BOD 5, TSS and ammonia removal influential, be 1: 1 so get long-width ratio.The current wetland area is bigger, should subregion, like this can the uniformly distributing flow, and be beneficial to management of plant and the harm that protective plant is avoided the disease worm.By length the current wetland processing unit is divided into three parts again.Promptly Zui Xiao processing lattice is of a size of 0.5m * 0.5m, and the degree of depth is 0.91m.For the ease of draining, the bottom gradient is taken as 1%~5%.
10. operating performance
After the trial run of assembled packing artificial wet land system input, water inlet, water outlet water sample were surveyed once every 2 days.Measuring method all carries out according to standard determination method.
COD measures and adopts dichromate titration, BOD to measure employing active sludge aeration edman degradation Edman, NH 3-N measures and adopts the nessler reagent colorimetry.
(1) May, the wetland operating performance was as shown in table 4: (mg/L of unit)
The water inlet of table 4 May, effluent quality data logging
Water inlet COD Water outlet COD Water inlet NH 3-N NH 3-N Water inlet BOD 5 BOD 5
5.1 296 46 26.7 7.5 96.5 19
5.4 318 52 25.3 6.2 101.8 17.5
5.7 256 48 29.5 8.2 120.2 21
5.10 291 38 32.5 5.6 106.7 16
Water inlet COD Water outlet COD Water inlet NH 3-N NH 3-N Water inlet BOD 5 BOD 5
5.13 306 53 31.7 5.1 86.5 10.5
5.16 285 35 26.4 5.6 100.9 16.5
5.19 268 36 23.5 6.7 96.5 20.5
5.22 298 26 29.5 7 112.6 16.7
5.27 263 29 25.4 4.7 120.8 13.8
5.30 345 52 19.8 5.1 110.6 17.2
As shown in Table 4, the May effluent quality can satisfy " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) one-level B standard substantially, and water outlet BOD is arranged twice 5Exceed one-level B regulation, its reason may be that system's fluctuation of service causes owing to initial operating stage.The clearance of all contaminations is along with the prolongation of working time all shows the trend of increase, and major cause is that the fixed microorganism has adapted to the interior environment of artificial wet land system on the filler, has formed good removal mechanisms at work, and water inlet is had removal effect preferably.
(2) June, the wetland operating performance was as shown in table 5: (mg/L of unit)
The water inlet of table 5 June, effluent quality data logging
Water inlet COD Water outlet COD Water inlet NH 3-N NH 3-N Water inlet BOD 5 BOD 5
6.2 263 35 25.4 5.3 112.6 17.5
6.5 298 50 29.5 7.5 106.7 19.2
6.8 325 52 30.4 7.8 100.8 18.2
6.11 306 59 31.7 5.4 87.2 15.2
6.14 285 34 26.4 6.3 92.5 18.3
6.17 294 41 26.7 7.5 99.4 17.5
6.20 286 42 28.6 6.9 103.8 19.2
6.23 310 51 31.6 7.8 110.7 18.6
6.28 279 35 28.4 6.4 106.5 17.3
As shown in Table 5, the June effluent quality can both satisfy " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) one-level B standard.The clearance of all contaminations is along with the prolongation of working time presents stable trend substantially, and it is less to fluctuate.Major cause is that every removal effect has also all formed good running because the operational system of artificial current wetland is ripe, and therefore the removal of every pollutent also tends towards stability.
(3) July, the wetland operating performance was as shown in table 6: (mg/L of unit)
The water inlet of table 6 July, effluent quality data logging
Water inlet COD Water outlet COD Water inlet NH 3-N NH 3-N Water inlet BOD 5 BOD 5
7.1 305 53 26.8 7.8 95.2 18.6
7.4 298 47 29.5 7.1 110.5 18.4
7.7 325 55 30.4 7.6 106.7 20.8
7.10 316 50 28.4 6.8 113.1 19
7.13 294 43 31.2 8.5 96.1 15.6
7.16 286 41 26.7 6.4 99.4 18.4
7.19 297 38 28.6 7.2 102.7 19.2
7.22 306 47 31.6 7.8 106.5 17.2
7.27 279 31 28.4 6.1 103.8 15.9
7.30 308 52 26 6.8 104.2 17.6
As shown in Table 6, the July effluent quality can satisfy " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) one-level B standard.The clearance of July all contaminations is along with the variation of time is basicly stable, and the water-content that goes out of every pollutent all is lower than " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) value of one-level B standard code.
Conclusion:
By trimestral steady running, the treatment effect of assembled packing artificial current wetland is good as can be known, and effluent quality can satisfy " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) one-level B standard.From May of initial operation to the stable July, system is also stable day by day to the degradation effect of every pollutent, removes efficient and also can maintain very high level.From average effect as can be seen, As time goes on, the data of every index of system's water outlet present the trend of increase, and the processing power that artificial wet land system is described is along with the prolongation of time can decrease, and filler and the matrix changed in the wetland are necessary in good time.
Compared with prior art, the sewage treatment wetland system that comprises assembled packing artificial vertical subsurface flow wetland unit provided by the utility model not only can effectively prevent the obstruction of wet land system, can also be according to the filler component of influent quality different adjustment wetland unit; And its maintenance is very convenient, can in time change blocking portion and do not influence other wetland units when take place stopping up, and has guaranteed the continuous operation of wet land system; Simultaneously, the unit that takes place to stop up can be used to sewage disposal again again by changing inner stuffing, has avoided waste.In addition, adopt the utility model wet land system to carry out the respond well of sewage disposal, stable to the degradation effect of every pollutent, it is higher to remove efficient, and effluent quality is good, can satisfy the town sewage emission standard.
Description of drawings:
Fig. 1 is the longitudinal sectional drawing of assembled packing artificial vertical subsurface flow wetland unit;
Fig. 2 is the floor plan synoptic diagram of sewage treatment wetland system;
Fig. 3 is the longitudinal sectional drawing of preliminary precipitation treating pond (8).
Embodiment:
Embodiment 1: a kind of sewage treatment wetland system (see figure 2), comprise equalizing tank 7, preliminary precipitation treating pond 8, peristaltic pump 9 and several wetland units 11, equalizing tank 7 connects bilge discharge pipe, link to each other successively through piping between equalizing tank 7, preliminary precipitation treating pond 8, peristaltic pump 9, water intaking valve 10, the wetland unit 11, header 12 joins with the water outlet of wetland unit 11.
Described wetland unit 11 is assembled packing artificial vertical subsurface flow wetland unit (as shown in Figure 1): comprise open-topped peripheral container 6 and five structural sheets that are placed in one, be followed successively by the substrate composed plantation layer 1 of infiltration, water distribution layer 2, packing layer 3, filter layer 4 in the peripheral container 6 from top to bottom, catchment layers 5.Water distribution layer 2, packing layer 3, filter layer 4 and layer 5 the matrix of catchmenting are layed on the plastic pallet of pore diameter less than the matrix particle diameter, the matrix of plantation layer 1 be laid immediately on water distribution layer 2 above.Peripheral container 6 usefulness glass reinforced plastic are made, and its top exceeds plantation layer 115cm.The thickness of plantation layer 1 is 15cm, and matrix is wherein mixed according to 4: 1 weight ratio with fine sand by the paddy soils of particle diameter<2mm and formed; The thickness of water distribution layer 2 is 10cm, and matrix wherein is that the coarse sand of 15mm is formed by particle diameter; The thickness of packing layer 3 is 20cm, and matrix wherein is made up of the biologic packing material (making at 1150 ℃ of sintering temperature 25min with dewatered sludge, flyash and the clay part by weight according to 5: 4: 1) of particle diameter 5mm; The thickness of filter layer 4 is 20cm, and matrix wherein is made up of according to 3: 2 weight ratio mixing the fine sand of the paddy soils of crossing the 5mm screen cloth and particle diameter 0.30mm; Layer 5 the thickness that catchments is 10cm, and matrix wherein is that the coarse sand of 15mm is formed by particle diameter.Be provided with water distribution branch pipe in the water distribution layer 2, the water distribution branch pipe bottom replaces even perforate, and the perforate direction is oblique following 30 °.The layer that catchments is laid with the perforation arm that catchments, the even perforate of level in 5; And be provided with turning gland and control valve, blow-off valve.For header is stopped up in the soil depression that prevents filter layer, be provided with layer of non-woven fabric between layers 5 with catchmenting at filter layer 4.The bed body long-width ratio of wetland unit is 1: 1; For improving sewage treating efficiency, according to the wetland area wetland treating part is divided into some unit, each unitary 0.5m * 0.5m * 0.91m (length * wide * height) that is of a size of.For the ease of draining, the bottom of wetland unit is provided with 3% the gradient.
Equalizing tank 7 (making of glass reinforced plastic) is of a size of 1m * 1m * 1m, and useful volume is 0.75m 3Its water inlet place is provided with middle grid, and the grizzly bar of middle grid is spaced apart 20mm, and middle grid is of a size of 0.5m * 0.5m.In order to reduce the probability that obstruction takes place in the subsequent disposal unit, the leading portion of preliminary precipitation treating pond 8 is provided with dusting cover, and the aperture of dusting cover is 1.6mm.Fix with clip between adjacent two wetland units 11, only need during replacing clip is unclamped, get final product by the lifting installation, to the not influence of processing of other parts, the normal operation of wet land system during having guaranteed to safeguard.
Preliminary precipitation treating pond 8 (referring to Fig. 3) is of a size of length * wide * height=1m * 1m * 1.25m, and useful volume is 1.125m 3, the bottom gradient is 2%; The bottom, slope is provided with mud receiving tank 13, is of a size of length * wide * height=0.25m * 1m * 0.3m; Trench bottom is provided with shore pipe 14 (DN50 steel pipe) and valve 15.
Embodiment 2: a kind of sewage treatment wetland system (see figure 2), comprise equalizing tank 7, preliminary precipitation treating pond 8, peristaltic pump 9 and several wetland units 11, equalizing tank 7 connects bilge discharge pipe, link to each other successively through piping between equalizing tank 7, preliminary precipitation treating pond 8, peristaltic pump 9, water intaking valve 10, the wetland unit 11, header 12 joins with the water outlet of wetland unit 11.
Described wetland unit 11 is assembled packing artificial vertical subsurface flow wetland unit (as shown in Figure 1): comprise open-topped peripheral container 6 and five structural sheets that are placed in one, be followed successively by the substrate composed plantation layer 1 of infiltration, water distribution layer 2, packing layer 3, filter layer 4 in the peripheral container 6 from top to bottom, catchment layers 5.Water distribution layer 2, packing layer 3, filter layer 4 and layer 5 the matrix of catchmenting are layed on the plastic pallet of pore diameter less than the matrix particle diameter, the matrix of plantation layer 1 be laid immediately on water distribution layer 2 above.The top of peripheral container 6 exceeds plantation layer 115cm.The thickness of plantation layer 1 is 20cm, and matrix is wherein mixed according to 3: 1 weight ratio with fine sand by the paddy soils of particle diameter<2mm and formed; The thickness of water distribution layer 2 is 15cm, and matrix wherein is that the coarse sand of 10mm is formed by particle diameter; The thickness of packing layer 3 is 25cm, and matrix wherein is made up of the biologic packing material of particle diameter 3mm; The thickness of filter layer 4 is 25cm, and matrix wherein is made up of according to 2: 1 weight ratio mixing the fine sand of the paddy soils of crossing the 5mm screen cloth and particle diameter 0.25mm; Layer 5 the thickness that catchments is 15cm, and matrix wherein is that the coarse sand of 10mm is formed by particle diameter.Be provided with water distribution branch pipe in the water distribution layer 2, the water distribution branch pipe bottom replaces even perforate, and the perforate direction is oblique following 40 °.The layer that catchments is laid with the perforation arm that catchments, the even perforate of level in 5.For header is stopped up in the soil depression that prevents filter layer, be provided with layer of non-woven fabric between layers 5 with catchmenting at filter layer 4.The bed body long-width ratio of wetland unit is 1: 1; For the ease of draining, the bottom of wetland unit is provided with 1% the gradient.
Water inlet place of equalizing tank 7 is provided with middle grid; The grizzly bar of middle grid is spaced apart 30mm.The leading portion of preliminary precipitation treating pond 8 is provided with dusting cover; The aperture of dusting cover is 1.6mm.Fix with clip between adjacent two wetland units 11.The bottom gradient of preliminary precipitation treating pond 8 (referring to Fig. 3) is 1%, and sloping bottom is provided with mud receiving tank 13, and trench bottom is provided with shore pipe 14 and valve 15.

Claims (8)

1. sewage treatment wetland system, comprise equalizing tank (7), preliminary precipitation treating pond (8), peristaltic pump (9) and at least one wetland unit (11), it is characterized in that: equalizing tank (7) connects bilge discharge pipe, link to each other successively through piping between equalizing tank (7), preliminary precipitation treating pond (8), peristaltic pump (9), water intaking valve (10), the wetland unit (11), header (12) joins with the water outlet of wetland unit (11); Described wetland unit (11) is an assembled packing artificial vertical subsurface flow wetland unit: comprise open-topped peripheral container (6) and five structural sheets that are placed in one, be followed successively by the substrate composed plantation layer of infiltration (1), water distribution layer (2), packing layer (3), filter layer (4), catchment layer (5) in the peripheral container (6) from top to bottom.
2. according to the described sewage treatment wetland system of claim 1, it is characterized in that: water inlet place of equalizing tank (7) is provided with middle grid.
3. according to the described sewage treatment wetland system of claim 2, it is characterized in that: the grizzly bar of middle grid is spaced apart 10~40mm.
4. according to the described sewage treatment wetland system of claim 1, it is characterized in that: the leading portion of preliminary precipitation treating pond (8) is provided with dusting cover.
5. according to the described sewage treatment wetland system of claim 4, it is characterized in that: the aperture of dusting cover is 1.6mm.
6. according to the described sewage treatment wetland system of claim 1, it is characterized in that: fix with clip between adjacent two wetland units (11).
7. according to claim 1 or 4 described sewage treatment wetland systems, it is characterized in that: the bottom of preliminary precipitation treating pond (8) is provided with 1%~2% the gradient.
8. according to the described sewage treatment wetland system of claim 7, it is characterized in that: the bottom least significant end of preliminary precipitation treating pond (8) is provided with mud receiving tank (13), and trench bottom is provided with shore pipe (14) and valve (15).
CN2009202660250U 2009-11-03 2009-11-03 Sewage treatment wetland system Expired - Fee Related CN201553667U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103332826A (en) * 2013-05-21 2013-10-02 东南大学 Multistage baffling-type reoxygenation constructed wetland sewage treatment system and sewage treatment method therefor
CN106865775A (en) * 2015-12-14 2017-06-20 上海开能环保设备股份有限公司 Pot type artificial wet land system
CN106957131A (en) * 2017-04-06 2017-07-18 舟山市润润环保能源科技有限公司 A kind of sewage purifier

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103332826A (en) * 2013-05-21 2013-10-02 东南大学 Multistage baffling-type reoxygenation constructed wetland sewage treatment system and sewage treatment method therefor
CN103332826B (en) * 2013-05-21 2015-01-28 东南大学 Multistage baffling-type reoxygenation constructed wetland sewage treatment system and sewage treatment method therefor
CN106865775A (en) * 2015-12-14 2017-06-20 上海开能环保设备股份有限公司 Pot type artificial wet land system
CN106957131A (en) * 2017-04-06 2017-07-18 舟山市润润环保能源科技有限公司 A kind of sewage purifier

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