CN103626297A

CN103626297A - Arranging method for submerged vegetation in mixed-type subsurface wetland system

Info

Publication number: CN103626297A
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: 2014-03-12
Anticipated expiration: 2032-08-24
Also published as: CN103626297B

Abstract

The invention discloses an arranging method for submerged vegetation in a mixed-type subsurface wetland system. Evergreen submerged turf is planted at the submerged turf planting region of the system, wherein 50% of the evergreen submerged turf is modified short vallisneria spiralis. According to the method, evergreen submerged turf with relatively strong pollution resistibility and modified short vallisneria spiralis are utilized for constructing the submerged biological system, and the physiological metabolic activities such as absorption, adsorption, settlement promotion, photosynthetic oxygen evolution, nitrification and the like of submerged vegetation are utilized for effectively removing nitrogen, phosphor and other nutrient pollutant in water and further purifying 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 be mainly utilize microorganism in system nitrated/denitrification is removed, the absorption of matrix and hygrophyte (being mainly emergent in traditional current wetland) absorb the pollution substances such as nitrogen phosphorus in water body such as removal such as the effect of grade.Wherein the effect of hygrophyte can be summarized as: 1) to be staggered into net be microorganism adheres to the surface-area that provides huge for the root system of plant prosperity and filler matrix, plays biomembranous effect; 2) photosynthesis of plant self, the metabolism of biomembranous absorption, absorption and microorganism can absorb the assimilation of part solubility pollutent; 3) root district law theory is thought, the emergent being grown in wetland absorbs and stem translocation by leaf, airborne oxygen is transported to root, through plant root, show again the diffusion of tissue, make like this root system microenvironment around present successively aerobic, anoxic and anaerobic state, be beneficial to the accumulation to phosphorus of nitrated/denitrification and microorganism, 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 removal effect is low, and bed body easily stops up.Based on above factor, cause that traditional undercurrent is wet is easy to anoxic and nitrification ability is not enough, matrix is easily stopped up the adsorptive power decline to 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, the 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 evergreen turf under water of the four seasons 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 stronger common four seasons of durability against pollution under water turf and dwarf forms eel grass build the stable ecosystem under water, utilize the physiological metabolism activities such as the absorption and sorption of these two kinds of submerged vegetation, short sedimentation, photosynthetic oxygen evolution to reach nitrogen in effective removal water, phosphorus and the object of other nutrition pollutents to purify 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 coral sand purification filtering pond of the subsurface flow wetland system of the embodiment of the present invention.

Embodiment

For technology contents of the present invention, feature and effect being had more specifically, understand, existing 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, 100.6 meters of overall lengths, 24.84 meters of beam overalls, area is 2498.904m2 (comprising building wall area) altogether, dark 1.3 meters.This mixed type subsurface flow wetland system is brick wall cement pit structure, and the unification of body of wall width 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 body of wall width), dark 1.3 meters, mainly by influent weir, water inlet pipe, twice wide-meshed screen

twice fine screen mesh

form with box out water outlet cross wall (Fig. 3) and surrounding body of wall of bottom.

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

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, can absorb fast the nutritive substance such as nitrogen, phosphorus in sewage, root system is long, and (root system of Ptilota plumosa can reach more than 50 centimetres, the root system of large algae can reach more than 1 meter), can play and increase the effect of adhering to and grow, reach bio-film colonization of area, promotion microorganism under water, 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 advantages of salvaging, easy to maintenance, once because sewage nutritive substance is too high, biomass is larger, can rapid artificially skim part Ptilota plumosa and large algae and not affect the stability that the ecosystem is planted on chinampa, therefore, can play the effect of removing nutritive substance, can play and safeguard subsurface flow wetland system again, improve the effect of wet land system permeability and purification efficiency.The red water chestnut in Taihu Lake also has similar effect, and the red water chestnut fast growth in Taihu Lake, can form fishery products and remove wetland, reaches the multipurposes such as production, purification, maintenance.

Chinampa growing area is divided into and is slit into 8 regions, comprises that 7 areas are identical

shape region and 1

(adjacent with pump sump, area 144.2m ²) shape region.Wherein, current flow into the cross wall of turf growing area (Fig. 4, wide 5 meters) not advance expenditure of bottom under water from chinampa growing area and box out, and are solid wall, but reduce highly successively 5 centimetres.From

shape region (near pump sump) starts, from chinampa growing area, enter the height of the cross wall of turf growing area under water and be 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, current flow into turf growing area under water from cross wall top; And be 1.3 meters from cross wall (the wide 5 meters) height of the chinampa of turf growing area inflow under water growing area, and box out in bottom, and the specification in hole is long 30 centimetres, and wide 20 centimetres, between hole, interval is 20 centimetres, is convenient to current from inflow chinampa, bottom growing area.

3. turf growing area under water

The area of turf growing area (algivorous insect+under water turf) 865m2 altogether under water, wherein, turf adopts evergreen turf under water of the four seasons under water, is all green turf under water throughout the year.In the evergreen turf under water of the four seasons of planting, dwarf forms eel grass accounts for 50%, and the evergreen turf under water of other four seasons except dwarf forms eel grass accounts 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, interval is 20 centimetres, being convenient to water flows into from bottom, and current to flow out the cross wall enter coral sand district be 0.85 meter of solid wall, do not box out in bottom, current flow into coral sand purification filtering pond from cross wall top.

4. coral sand purification filtering pond and outlet sump

This region is 60m altogether ²(not comprising wall area), be divided into coral sand purification filtering pond and outlet sump two portions, wherein the coral sand of 0.6 meter of the inner raising in coral sand purification filtering pond.Current certainly shape under water turf and algivorous insect district flows into coral sand purification filtering pond through the cross wall top of high 0.85 meter.The body of wall of the cross wall of current outflow 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, interval is 20 centimetres, is convenient to water from inflow exhalant region, bottom.Water flows out through rising pipe from outlet sump after coral sand purification filtering.

5. aerating system under water

Aerating system is pvc aerated conduit under water, has 4 noiselessness air pumps, 480 watts every.Pvc pipeline is laid on wetland bottom 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 foreign material in water.Then the body of wall of boxing out through bottom enters chinampa growing area and the interlocking area of turf growing area under water, water first flows into turf growing area under water from the cross wall top progressively reducing, from turf growing area under water, flow to chinampa growing area again, like this, sewage is through chinampa growing area with under water after alternately the purifying of turf growing area, finally through be highly 0.85m entity cross wall ( the cross wall that type pasture and water turf growing area is adjacent with coral sand filtration, purification pond) top enters coral sand purification filtering pond, and the rising pipe through coral sand filtration, purification by outlet sump flows out.In this process, utilize 4 noiselessness aerator pump aerations of underwater aeration device, the auxiliary effects of purification quality that strengthens.

Claims

1. the collocation method of submerged vegetation in mixed type subsurface flow wetland system, is characterized in that, the growing area of the turf under water plantation evergreen turf under water of the four seasons of this mixed type subsurface flow wetland system, and 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.