CN110627336A - Artificial wetland system for treating fluidized sludge - Google Patents
Artificial wetland system for treating fluidized sludge Download PDFInfo
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- CN110627336A CN110627336A CN201910982585.4A CN201910982585A CN110627336A CN 110627336 A CN110627336 A CN 110627336A CN 201910982585 A CN201910982585 A CN 201910982585A CN 110627336 A CN110627336 A CN 110627336A
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- constructed wetland
- layer
- water collecting
- wetland system
- coarse sand
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- 239000010802 sludge Substances 0.000 title claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 81
- 239000010865 sewage Substances 0.000 claims abstract description 24
- 238000011001 backwashing Methods 0.000 claims description 48
- 239000004576 sand Substances 0.000 claims description 35
- 239000004575 stone Substances 0.000 claims description 8
- 239000002689 soil Substances 0.000 claims description 5
- 238000013461 design Methods 0.000 abstract description 5
- 239000010410 layer Substances 0.000 description 43
- 235000014676 Phragmites communis Nutrition 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 244000273256 Phragmites communis Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 241001148470 aerobic bacillus Species 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 235000011194 food seasoning agent Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Hydroponics (AREA)
Abstract
The invention provides an artificial wetland system for treating fluidized sludge, which sequentially comprises a water distribution system, an artificial wetland and a water collecting channel from left to right, wherein the artificial wetland system is in a trapezoid shape with the water distribution system as a short side and the water collecting channel as a long side as a whole, and sewage flows through the artificial wetland from the water distribution system to the water collecting channel. The wetland of the invention is of an isosceles trapezoid structure, sewage flows in from the short side and flows out from the long side of the isosceles trapezoid, the design is suitable for treating sludge with high water content and effectively controlling the flow rate of the sludge, the design is suitable for being applied to rural sludge treatment and community sludge treatment with small sewage treatment plants, and the burden of rural or community sludge treatment can be reduced.
Description
Technical Field
The invention relates to equipment for treating fluid sludge, in particular to an artificial wetland system for treating fluid sludge.
Background
With the continuous acceleration of the urbanization level in China and the gradual improvement of the requirement on environmental protection, the number and the processing capacity of urban sewage treatment plants are increased year by year, and the amount of the generated excess sludge is increased day by day. A large amount of sludge is not effectively and safely treated and disposed, so that the sludge becomes a bottleneck influencing the normal operation and development of rural sewage treatment plants, and the realization of the energy conservation and emission reduction target of sewage and the exertion of sewage treatment benefits are directly influenced. Because the sewage treatment capacity in rural areas is small, the sludge production capacity is small, the agricultural consumption is fast, and the use of a special sludge treatment device is unrealistic. The sludge treatment technology of the artificial wetland is one of land utilization, can realize the reduction, stabilization and resource treatment of the sludge, and is very suitable for the treatment and disposal of the sludge in sewage treatment plants in rural areas and medium and small towns in China. The sludge treatment wetland system in the prior art does not solve the problem of sewage flow rate control from the improvement of the wetland structure. Therefore, it is necessary to develop and design an artificial wetland strengthening system capable of more effectively treating the flow-state sludge generated in rural areas or small communities.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides the constructed wetland system which aims at the fluid sludge produced in rural areas and medium and small towns and can effectively separate cement and degrade organic pollutants.
The invention provides the following technical scheme:
the artificial wetland system for treating the fluidized sludge sequentially comprises a water distribution system, an artificial wetland and a water collecting channel from left to right, the artificial wetland system is in a trapezoid shape taking the water distribution system as a short side and the water collecting channel as a long side as a whole, and sewage flows through the artificial wetland from the water distribution system to the water collecting channel.
Furthermore, the artificial wetland system is in an isosceles trapezoid shape, and the length ratio of the central axis of the long axis to the central axis of the short axis is less than or equal to 2: 1.
Furthermore, the water distribution system adopts a water inlet perforated water distribution wall.
Furthermore, the constructed wetland comprises a first coarse sand layer, a second coarse sand layer, a gravel layer, a fine gravel layer, a third coarse sand layer and a vegetation soil layer from bottom to top in sequence, wherein the diameter of the first coarse sand layer is 80-100cm, the diameter of the second coarse sand layer is 50-80cm, the diameter of the gravel layer is 30-50cm, the diameter of the gravel of the fine gravel layer is 5-10cm, and the diameter of the third coarse sand layer is 50-90 cm.
Further, the vegetation soil layer aquatic plants.
Further, the thickness of the first coarse sand layer is 10-15 cm; the thickness of the second coarse sand layer is 10-15 m; the thickness of the crushed stone layer is 15-20 cm; the thickness of the fine crushed stone layer is 15-20 cm; the thickness of the third coarse sand layer is 15-20 cm.
Furthermore, the bottom and the periphery of the artificial wetland are provided with industrial geomembranes, and the density is 700g/m2。
Furthermore, a water collecting pipe is arranged on the crushed stone layer and leads to the water collecting channel.
Furthermore, the water collecting pipe is provided with a through hole which is opened upwards, and the water collecting pipe is laid perpendicular to the flow direction of the sewage.
Furthermore, a plurality of perforated sludge discharge pipes are laid in the direction perpendicular to the sewage flow direction of the first coarse sand layer, a sludge discharge main pipe is connected to the end point of one side of each perforated sludge discharge pipe, the sludge discharge main pipe leads to the outside of the artificial wetland, and through holes are formed in the positions, inclined downwards by 45 degrees, of the perforated sludge discharge pipes.
Further, the plurality of perforated sludge discharge pipes are laid in parallel with each other.
Furthermore, a backwashing device is laid on the second coarse sand layer, the backwashing device consists of backwashing branch pipes and a backwashing main pipe, the backwashing branch pipes are laid side by side perpendicular to the sewage flow direction, and the backwashing main pipe is vertically connected with each backwashing branch pipe and extends to the water collecting tank.
Furthermore, the back washing devices are arranged at the rear half section of the side of the artificial wetland close to the water collecting channel, and the number of the back washing devices is 2-3 groups.
Furthermore, one end of the water collecting channel of the back washing main pipe is provided with a control valve, each back washing branch pipe is laid at an interval of 0.5-0.8m, and two ends of each back washing branch pipe are provided with check valves.
By adopting the technical scheme, the invention has the following beneficial effects:
1. the invention improves the structure of the traditional wetland, can treat the sludge with the water content higher than 95 percent, can dehydrate the sludge and separate mud from water, can degrade organic pollutants in the sludge, and achieves the effect of ecological treatment of the sludge;
2. the sludge discharge structure is arranged at the bottom of the wetland, so that the settled sludge in the system can be effectively discharged, the wetland substrate is prevented from being blocked, and the service life is prolonged;
3. the invention arranges the back washing system on the wetland packing layer, can further clean sludge attached on the wetland packing, fallen biological membranes and the like, effectively prevent the packing from being blocked and prolong the service life of the wetland;
4. the wetland of the invention is of an isosceles trapezoid structure, sewage flows in from the short side and flows out from the long side of the isosceles trapezoid, the design is suitable for treating sludge with high water content and effectively controlling the flow rate of the sludge, the design is suitable for being applied to rural sludge treatment and community sludge treatment with small sewage treatment plants, and the burden of rural or community sludge treatment can be reduced.
Drawings
FIG. 1 is a schematic top view of the constructed wetland system of the present invention
Fig. 2 is a schematic sectional structure view of the constructed wetland system of the present invention;
FIG. 3 is a schematic structural view of a sludge discharge pipe laid by the constructed wetland system of the invention;
fig. 4 is a schematic structural view of a backwashing device laid by the artificial wetland system of the invention.
Wherein; 1-water distribution system, 2-artificial wetland, 3-water collecting channel, 4-water collecting pipe, 5-water outlet, 6-water outlet control valve body, 7-perforated sludge discharge pipe, 8-sludge discharge main pipe, 9-backwashing branch pipe, 10-backwashing main pipe, 11-check valve and 12-backwashing control valve
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the block diagrams and specific examples are set forth only for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Example 1
As shown in fig. 1, the invention provides an artificial wetland system for treating fluidized sludge, which comprises a water distribution system 1, an artificial wetland 2 and a water collecting channel 3 from left to right. Wherein, the water distribution system can adopt a water inlet perforation water distribution wall. The artificial wetland system is in a trapezoid shape with the water inlet perforated water distribution wall as a short side and the water collecting channel as a long side, and sewage flows through the artificial wetland from the water inlet perforated water distribution wall to the water collecting channel. Preferably, the artificial wetland system is an isosceles trapezoid, and the length ratio of the central axis h of the long shaft to the central axis a of the short shaft is less than or equal to 2: 1. Wherein, the sludge enters the wetland through the water inlet perforation water distribution wall, and the holes of the water distribution wall are square holes with the size of 0.5m by 0.5 m. The wetland is designed into an isosceles trapezoid, the area of the sludge overflowing cross section at the water inlet is small, the area of the sludge overflowing cross section at the water outlet is large, the sludge flow velocity is gradually increased along with the overflowing cross section, and the flow velocity is reduced to be beneficial to SS sedimentation in sludge. The ratio h: a of the lengths of the central axis of the long shaft to the central axis of the short shaft is less than or equal to 2:1, the flow velocity of sludge can be rapidly reduced by rapidly expanding the wetland during overflowing and cross section, and the sedimentation of the sludge is facilitated.
Example 2
As shown in fig. 2, the artificial wetland comprises a first coarse sand layer, a second coarse sand layer, a gravel layer, a fine gravel layer, a third coarse sand layer and a vegetation soil layer from bottom to top in sequence, wherein the diameter of the first coarse sand layer is 80-100cm, the diameter of the second coarse sand layer is 50-80cm, the diameter of the gravel layer is 30-50cm, the diameter of the gravel of the fine gravel layer is 5-10cm, and the diameter of the third coarse sand layer is 50-90 cm. The wetland matrix layer has the function of purifying water quality, and pollutants in the sludge are degraded by utilizing the physical adsorption function among the gravels and the microbial action attached to the surface layer of the gravels. Preferably, the bottom and the periphery of the artificial wetland are provided with industrial geomembranes with the density of 700g/m2。
Wherein the thickness of the first coarse sand layer is 10-15 cm; the thickness of the second coarse sand layer is 10-15 m; the thickness of the crushed stone layer is 15-20 cm; the thickness of the fine crushed stone layer is 15-20 cm; the thickness of the third coarse sand layer is 15-20 cm.
The aquatic plants on the vegetation soil layer can be planted with reeds, and the reeds can create an aerobic environment at the roots and promote the growth of autotrophic and heterotrophic aerobic bacteria; meanwhile, the hydraulic condition can be optimized, the biological membrane is increased, and the specific surface area is increased; the reed can improve the sludge reduction amount, reduce the sludge volume by 3 to 8 percent, and has better sludge drying and stabilizing effects.
Example 3
As shown in fig. 2-3, a water collecting pipe 4 is arranged on the crushed stone layer, the water collecting pipe leads to the water collecting channel 3, the water collecting pipe is made of PE, the aperture is d110, the water collecting pipe is provided with a through hole which is opened upwards, the aperture of the through hole is d14, and the water collecting pipe is laid perpendicular to the flow direction of the sewage.
The wetland system is provided with a sludge discharge system. Perforated sludge discharge pipes 7 are arranged on the coarse sand layer at the lowermost layer of the wetland substrate at equal intervals. The plurality of perforated mud pipes are laid in parallel, and the end point of one side of each perforated mud pipe is connected with a mud discharging main pipe 8. Solid sludge with the water content of 95% is mainly settled at the bottom of the wetland, and the settled sludge is converged into a sludge discharge header pipe through a perforated sludge discharge pipe and discharged out of the wetland system.
The perforated sludge discharge pipe is made of PE material, and the aperture is 110 cm. The perforating positions of the pipes are all inclined downwards by 45 degrees, and the aperture of the perforating sludge discharge pipe is 20 cm.
Example 4
The artificial wetland system lays a backwashing device on the second coarse sand layer, the backwashing device consists of backwashing branch pipes 9 and a backwashing main pipe 10, the backwashing branch pipes are laid side by side perpendicular to the sewage flow direction, and the backwashing main pipe is vertically connected with each backwashing branch pipe and extends to the water collecting tank.
The back flushing devices are arranged at the rear half section of the side of the artificial wetland close to the water collecting channel, and the number of the back flushing devices is 2-3 groups. One end of the water collecting channel of the back washing main pipe is provided with a control valve 12, each back washing branch pipe is laid at intervals of 0.5-0.8m, two ends of each back washing branch pipe are provided with check valves 11, water can flow into the wetland when the back washing device is started, and sludge, sewage and the like in the wetland can be prevented from flowing into the back washing branch pipes when the back washing device is closed. When the backwashing system is started, the water level rises along with the start of the backwashing system, and water is discharged through the perforated water distribution wall. The back washing system can further clean sludge attached to the wetland filler and fallen biological films and the like, effectively prevent the filler from being blocked and prolong the service life of the wetland
The wetland back washing device and the sludge treatment are operated intermittently and controlled by an external control valve well. And starting a back washing system for 3 months generally to wash the seasoning of the wetland, wherein the back washing outlet water passes through the water inlet perforation water distribution wall at the initial end of the wetland to discharge water.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (14)
1. The artificial wetland system for treating the fluidized sludge is characterized in that the artificial wetland system is in a trapezoid shape taking the water distribution system as a short side and the water collecting channel as a long side as a whole, and sewage flows through the artificial wetland from the water distribution system to the water collecting channel.
2. The constructed wetland system of claim 1, wherein the constructed wetland system is an isosceles trapezoid, and the ratio of the length of the central axis of the long axis to the length of the central axis of the short axis is less than or equal to 2: 1.
3. The constructed wetland system of claim 1, wherein the water distribution system adopts a water inlet perforated water distribution wall.
4. The constructed wetland system of claim 1, wherein the constructed wetland comprises a first coarse sand layer, a second coarse sand layer, a gravel layer, a fine gravel layer, a third coarse sand layer and a vegetation soil layer from bottom to top in sequence, wherein the sand grain diameter of the first coarse sand layer is 80-100cm, the sand grain diameter of the second coarse sand layer is 50-80cm, the gravel diameter of the gravel layer is 30-50cm, the gravel diameter of the fine gravel layer is 5-10cm, and the sand grain diameter of the third coarse sand layer is 50-90 cm.
5. The constructed wetland system of claim 4, wherein the vegetation layer aquatic plants.
6. The constructed wetland system of claim 4, wherein the thickness of the first grit layer is 10-15 cm; the thickness of the second coarse sand layer is 10-15 m; the thickness of the crushed stone layer is 15-20 cm; the thickness of the fine crushed stone layer is 15-20 cm; the thickness of the third coarse sand layer is 15-20 cm.
7. The constructed wetland system of claim 4, wherein the constructed wetland is provided with industrial geomembranes at the bottom and around the constructed wetland, and the density is 700g/m 2.
8. The constructed wetland system of claim 4, wherein a water collecting pipe is arranged on the gravel layer, and the water collecting pipe leads to a water collecting channel.
9. The constructed wetland system of claim 8, wherein the water collecting pipe is provided with a through hole which is opened upwards, and the water collecting pipe is laid perpendicular to the flow direction of the sewage.
10. The constructed wetland system of claim 4, wherein a plurality of perforated sludge discharge pipes are laid on the first coarse sand layer perpendicular to the sewage flow direction, a sludge discharge main pipe is connected to the end point of one side of each perforated sludge discharge pipe, the sludge discharge main pipe leads to the outside of the constructed wetland, and through holes are arranged at positions 45 degrees below the perforated sludge discharge pipes.
11. The constructed wetland system of claim 10, wherein the plurality of perforated sludge discharge pipes are laid parallel to each other.
12. The constructed wetland system of claim 4, wherein a backwashing device is laid on the second coarse sand layer, the backwashing device comprises backwashing branch pipes and a backwashing main pipe, the backwashing branch pipes are laid side by side perpendicular to the sewage flow direction, and the backwashing main pipe is vertically connected with each backwashing branch pipe and extends to the water collecting tank.
13. The constructed wetland system of claim 12, wherein the backwashing devices are arranged at the rear half section of the constructed wetland near the water collecting channel, and the quantity of the backwashing devices is 2-3 groups.
14. The constructed wetland system of claim 12, wherein a control valve is arranged at one end of the water collecting channel of the back washing main pipe, the back washing branch pipes are laid at intervals of 0.5-0.8m, and check valves are arranged at two ends of the back washing branch pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910982585.4A CN110627336A (en) | 2019-10-16 | 2019-10-16 | Artificial wetland system for treating fluidized sludge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910982585.4A CN110627336A (en) | 2019-10-16 | 2019-10-16 | Artificial wetland system for treating fluidized sludge |
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| CN201910982585.4A Pending CN110627336A (en) | 2019-10-16 | 2019-10-16 | Artificial wetland system for treating fluidized sludge |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101284705A (en) * | 2008-01-23 | 2008-10-15 | 南京大学 | Tower type earthworm and ecological filter for treating sewage |
| CN204625447U (en) * | 2015-05-15 | 2015-09-09 | 浙江海洋学院 | A kind of artificial wet land system |
| CN108751649A (en) * | 2018-08-07 | 2018-11-06 | 郑州大学环境技术咨询工程有限公司 | A kind of processing system having to rural sewage treatment excess sludge |
| CN208898599U (en) * | 2018-08-20 | 2019-05-24 | 中电建路桥集团有限公司 | A kind of artificial wet land system |
| CN210885734U (en) * | 2019-10-16 | 2020-06-30 | 岭南水务集团有限公司 | Artificial wetland system for treating fluidized sludge |
-
2019
- 2019-10-16 CN CN201910982585.4A patent/CN110627336A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101284705A (en) * | 2008-01-23 | 2008-10-15 | 南京大学 | Tower type earthworm and ecological filter for treating sewage |
| CN204625447U (en) * | 2015-05-15 | 2015-09-09 | 浙江海洋学院 | A kind of artificial wet land system |
| CN108751649A (en) * | 2018-08-07 | 2018-11-06 | 郑州大学环境技术咨询工程有限公司 | A kind of processing system having to rural sewage treatment excess sludge |
| CN208898599U (en) * | 2018-08-20 | 2019-05-24 | 中电建路桥集团有限公司 | A kind of artificial wet land system |
| CN210885734U (en) * | 2019-10-16 | 2020-06-30 | 岭南水务集团有限公司 | Artificial wetland system for treating fluidized sludge |
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