CN103626297B

CN103626297B - The collocation method of submerged vegetation in mixed type subsurface flow wetland system

Info

Publication number: CN103626297B
Application number: CN201210304204.5A
Authority: CN
Inventors: 何文辉
Original assignee: SHANGHAI TAIHE WATER ECOLOGICAL TECHNOLOGY Co Ltd
Current assignee: Shanghai Taihe Water Technology Development Co.,Ltd.
Priority date: 2012-08-24
Filing date: 2012-08-24
Publication date: 2016-01-20
Anticipated expiration: 2032-08-24
Also published as: CN103626297A

Abstract

The invention discloses the collocation method of submerged vegetation in a kind of submerged vegetation and floatingleaved vegetation mixed type subsurface flow wetland system, it plants the four seasons evergreen turf under water in turf growing area under water, and wherein, 50% is improvement dwarf forms eel grass.The four seasons that the present invention utilizes durability against pollution stronger evergreen turf under water and improvement dwarf forms eel grass build the ecosystem under water, to utilize the physiological metabolism activity such as the absorption and sorption of submerged vegetation, short sedimentation, photosynthetic oxygen evolution, nitrification to reach effectively to remove in water nitrogen, phosphorus and other nutrition pollutents with the object purified water.

Description

The collocation method of submerged vegetation in mixed type subsurface flow wetland system

Technical field

The present invention relates to advanced treatment of wastewater, specifically relate to the collocation method of submerged vegetation in submerged vegetation and floatingleaved vegetation mixed type subsurface flow wetland system.

Background technology

Conventional current wetland basic structure comprises a body, matrix and hygrophilous vegetation, its ultimate principle mainly utilize microorganism in system nitrated/denitrification carries out removing, the absorption of matrix and hygrophyte (being mainly emergent in traditional current wetland) absorb the pollution substances such as the nitrogen phosphorus in water body such as removal such as the effect of grade.Wherein the effect of hygrophyte can be summarized as: 1) root system of plant prosperity and filler matrix are staggered into net is that the attachment of microorganism provides huge surface-area, plays biomembranous effect; 2) photosynthesis of plant self, the metabolism of biomembranous absorption, absorption and microorganism can by part soluble pollutants assimilation; 3) root district law theory is thought, emergent in wetland is absorbed and stem translocation by leaf in growth, by the O_2 transport in air to root, the diffusion of tissue is shown again through plant root, the microenvironment around root system is made to present aerobic, anoxic and anaerobic state successively like this, be beneficial to nitrated/denitrification and microorganism to the accumulation of phosphorus, finally by periodic replacement matrix or harvesting plant, pollution substance finally removed from system.But in this traditional current wetland design, emergent oxygen delivery capacity is poor, and nitrogen phosphorus ligands effect is low, and bed body easily blocks.Based on above factor, cause traditional undercurrent to wet being easy to anoxic and nitrification ability is not enough, matrix easily blocks and declines to the adsorptive power of phosphorus, effects of purification quality is not good.

Summary of the invention

The technical problem to be solved in the present invention is to provide the collocation method of submerged vegetation in a kind of mixed type subsurface flow wetland system, and it can overcome the shortcoming that in traditional wetland, dissolved oxygen is not enough, removal efficiency of nitrogen and phosphorus is low, permeability is poor, decontamination effect improving of increasing water quality.

For solving the problems of the technologies described above, the collocation method of submerged vegetation in mixed type subsurface flow wetland system of the present invention, it plants the four seasons evergreen turf under water in turf growing area under water, and the described four seasons, evergreen turf under water comprised dwarf forms eel grass.

The collocation method of submerged vegetation in mixed type subsurface flow wetland system of the present invention, with durability against pollution stronger common four seasons under water turf and dwarf forms eel grass build the stable ecosystem under water, utilize the absorption and sorption of these two kinds of submerged vegetation, the short physiological metabolism such as sedimentation, photosynthetic oxygen evolution activity reach and effectively to remove in water nitrogen, phosphorus and other nutrition pollutents with the object purified water.

Accompanying drawing explanation

Fig. 1 is the structural representation of the subsurface flow wetland system of the embodiment of the present invention.

Fig. 2 is the cross-sectional view of the subsurface flow wetland system of the embodiment of the present invention.

Fig. 3 is the bottom undercurrent curtain wall structure schematic diagram of the subsurface flow wetland system of the embodiment of the present invention.

Fig. 4 is the water body spillwag chute curtain wall structure schematic diagram of the subsurface flow wetland system of the embodiment of the present invention.

Fig. 5 is the vertical section structure schematic diagram in the cleaned filter tank of coral sand of the subsurface flow wetland system of the embodiment of the present invention.

Embodiment

Understand more specifically for having technology contents of the present invention, feature and effect, now in conjunction with illustrated embodiment, to the concrete structure of this novel mixing wetland, details are as follows:

The submerged vegetation of the present embodiment and floatingleaved vegetation mixed type subsurface flow wetland system, overall length 100.6 meters, beam overall 24.84 meters, area is 2498.904m altogether ²(comprising building wall area), dark 1.3 meters.This mixed type subsurface flow wetland system is brick wall cement pit structure, and width of wall body unification is 28 centimetres, and it specifically forms structure and refers to shown in Fig. 1,2, comprising:

1. pump sump

Long 20.56 meters of pump sump, wide 5 meters (comprising surrounding width of wall body), dark 1.3 meters, primarily of influent weir, water inlet pipe, twice wide-meshed screen twice fine screen mesh with bottom box out water outlet cross wall (Fig. 3) and surrounding body of wall composition.

Whole pump sump is by 4 road screen clothes (mesh widths is 4.44 meters) even partition.Twice wide-meshed screen front, the 1st road scalping net height 1.3 meters, comprising bottom box out (bottom cement brick body advance expenditure, long, height is 20 centimetres; Long 30 centimetres of hole, high 20 centimetres), be convenient to water and flow out from bottom; 2nd road scalping net height 1 meter, bottom contacts with at the bottom of pond, and current can flow out from net top.Twice fine screen mesh is rear, and the 3rd road dusting cover net height 1.3 meters, comprises bottom advance expenditure and box out (advance expenditure and hole gauge lattice are with the 1st road wide-meshed screen), be convenient to water and flow out from bottom; 4th road dusting cover net height 0.8 meter, bottom contacts with at the bottom of pond, and water can flow out from top.Last is wide 5 meters, high 1.3 meters water outlet cross walls together, and the body of wall of water outlet cross wall wide is 28 centimetres, boxes out comprising bottom, long 30 centimetres of hole, and hole is high 20 centimetres, 20 centimetres, interval between Kong Yukong, is convenient to water and flows into floatingleaved plant growing area from bottom.

2. chinampa growing area

Chinampa growing area area is 830m ², for planting floatingleaved plant, wherein, Ptilota plumosa accounts for 60%, and large algae accounts for 20%, and the red water chestnut in Taihu Lake accounts for 20%.Ptilota plumosa and large algae have high durability against pollution and purification efficiency, fast growth, the nutritive substance such as nitrogen, phosphorus in sewage can be absorbed fast, root system is longer, and (root system of Ptilota plumosa can reach more than 50 centimetres, the root system of large algae can reach more than 1 meter), the effect increasing area under water, promote the attachment of microorganism and growth, reach bio-film colonization can be played, promote the apposition growth of nitrated/denitrifying bacterium, strengthen the removal effect to nitrogen, phosphorus nutrition material in water.Simultaneously, Ptilota plumosa and large algae also have salvaging, advantage easy to maintenance, once because sewage nutritive substance is too high, biomass is larger, rapid artificially can skim part Ptilota plumosa and large algae and not affect the stability of the chinampa plantation ecosystem, therefore, the effect of removing nutritive substance can be played, can play again and safeguard subsurface flow wetland system, improve the effect of wet land system permeability and purification efficiency.Red water chestnut also has similar effect in Taihu Lake, and the red water chestnut fast growth in Taihu Lake, fishery products can be formed and remove wetland, reach the multipurposes such as production, purification, maintenance.

Chinampa growing area is divided into and is slit into 8 regions, comprises 7 areas identical shape region and 1 (adjacent with pump sump, area 144.2m ²) shape region.Wherein, cross wall (Fig. 4, wide 5 meters) the bottom not advance expenditure that current flow into turf growing area under water from chinampa growing area is boxed out, and is solid wall, but reduces by 5 centimetres highly successively.From (near pump sump) starts in shape region, the height entering the cross wall of turf growing area under water from chinampa growing area is followed successively by 1.25 meters, 1.20 meters, 1.15 meters, 1.10 meters, 1.05 meters, 1.00 meters, 0.95 meter and 0.90 meter with water (flow) direction, and current flow into turf growing area under water from cross wall top; And being 1.3 meters from cross wall (the wide 5 meters) height of the chinampa of turf growing area inflow under water growing area, box out in bottom, the specification in hole is long 30 centimetres, and wide 20 centimetres, between hole 20 centimetres, interval, is convenient to current from inflow chinampa, bottom growing area.

3. turf growing area under water

The area of turf growing area (algivorous insect+turf under water) 865m altogether under water ², wherein, turf adopts the four seasons evergreen turf under water under water, is namely all green turf under water throughout the year.In the four seasons planted evergreen turf under water, dwarf forms eel grass accounts for 50%, and other four seasons except dwarf forms eel grass, evergreen turf under water accounted for 50%.This district be divided into 8 identical shape region and 1 shape region.Wherein row region is last near coral sand treating pond region, the cross wall of its current inflow direction is 1.3 meters, box out in bottom, the specification in hole is long 30 centimetres, and wide 20 centimetres, between hole 20 centimetres, interval, be convenient to water flow into from bottom, and the cross wall that current outflow enters coral sand district is 0.85 meter of solid wall, do not box out in bottom, and current flow into the cleaned filter tank of coral sand from cross wall top.

4. the cleaned filter tank of coral sand and outlet sump

This region is 60m altogether ²(not comprising wall area), be divided into the cleaned filter tank of coral sand and outlet sump two portions, the coral sand of the wherein inner raising 0.6 meter in the cleaned filter tank of coral sand.Current certainly shape under water turf and algivorous insect district flows into the cleaned filter tank of coral sand through the cross wall top of high 0.85 meter.The body of wall that current flow out the cross wall in direction is high 1.3 meters, and bottom advance expenditure is boxed out, and the specification in hole is long 30 centimetres, and wide 20 centimetres, between hole 20 centimetres, interval, is convenient to water from inflow exhalant region, bottom.Water flows out from outlet sump through rising pipe after coral sand purification filtering.

5. aerating system under water

Aerating system is pvc aerated conduit under water, has 4 noiselessness air pumps, every platform 480 watts.Pvc pipeline is laid on bottom wetland with Fig. 1 water (flow) direction, plays aeration oxygen replenishing strengthening effects of purification quality.

The concrete methods of realizing that application said system purifies water is as follows:

First, sewage enters pump sump through influent weir and water inlet pipe, through the preliminary filtration of pump sump twice wide-meshed screen and twice fine screen mesh, disposes the rubbish such as the foreign material in water.Then body of wall of boxing out through bottom enters the interlocking area of chinampa growing area and turf growing area under water, water first flows into turf growing area under water from the cross wall top progressively reduced, chinampa growing area is flowed to again from turf growing area under water, like this, sewage after the alternately purification through chinampa growing area and turf growing area under water, finally through be highly the entity cross wall of 0.85m (namely the cross wall that type pasture and water turf growing area is adjacent with coral sand filtration, purification pond) top enters the cleaned filter tank of coral sand, flows out through the rising pipe of outlet sump after coral sand filtration, purification.In the process, utilize 4 noiselessness aerator pump aerations of underwater aeration device, auxiliary enhancing effects of purification quality.

Claims

1. the collocation method of submerged vegetation in mixed type subsurface flow wetland system, it is characterized in that, described mixed type subsurface flow wetland system comprises: pump sump, chinampa growing area, under water turf growing area, the cleaned filter tank of coral sand, outlet sump and aerating system under water; Described pump sump to be boxed out water outlet cross wall and surrounding body of wall composition primarily of influent weir, water inlet pipe, wide-meshed screen, fine screen mesh, bottom; Sewage introduces pump sump through described influent weir and water inlet pipe, and the wide-meshed screen in pump sump, fine screen mesh tentatively filter; Sewage after preliminary filtration enters the interlocking area of chinampa growing area and turf growing area under water via described bottom water outlet body of wall of boxing out, chinampa growing area and under water turf growing area carry out replacing and purify; Water first flows into turf growing area under water from the cross wall top progressively reduced, then flows to chinampa growing area from turf growing area under water; Described chinampa growing area is for planting floatingleaved vegetation; Described floatingleaved vegetation comprises Ptilota plumosa, large algae and the red water chestnut in Taihu Lake; The bottom advance expenditure of the cross wall between the cleaned filter tank of described coral sand and outlet sump is boxed out; After chinampa growing area and turf growing area carries out alternately purification under water water enter coral sand cleaned filter tank purification, boxed out by the bottom advance expenditure of the cross wall between the cleaned filter tank of described coral sand and outlet sump and enter outlet sump; Described outlet sump comprises rising pipe; Water after the purification filtering of coral sand cleaned filter tank flows out through the rising pipe of outlet sump; Described aerating system is under water PVC aerated conduit; PVC aerated conduit is laid on bottom wetland with water (flow) direction; The growing area of the turf under water plantation four seasons evergreen turf under water of this mixed type subsurface flow wetland system, the described four seasons, evergreen turf under water comprised dwarf forms eel grass.

2. the collocation method of submerged vegetation according to claim 1, is characterized in that, the cultivated area of described dwarf forms eel grass accounts for 50% of turf growing area area under water.