CN110590103A - Bottom mud restoration and treatment method for urban black and odorous riverway - Google Patents
Bottom mud restoration and treatment method for urban black and odorous riverway Download PDFInfo
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- CN110590103A CN110590103A CN201910793280.9A CN201910793280A CN110590103A CN 110590103 A CN110590103 A CN 110590103A CN 201910793280 A CN201910793280 A CN 201910793280A CN 110590103 A CN110590103 A CN 110590103A
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- bottom mud
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- 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
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- 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
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- 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
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
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- 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for restoring and treating bottom mud of an urban black and odorous river, which relates to the technical field of riverbed pollution treatment and aims to solve the technical problems that the bottom mud needs to be transported to other fields for treatment and stacking, the transportation cost is high, and the operation is inconvenient in the prior art, and the technical scheme is characterized by comprising the following steps: s1, dredging and piling bottom mud at the bottom of the river channel, wherein the bottom mud is 25-30cm in length, and piling the bottom mud to the two sides of the river channel; s2, paving a heavy metal barrier layer at the bottom of the dug river channel; s3, airing the dredged sediment, and ploughing the sediment through ploughing equipment; s4, throwing the composite modifier in the process of ploughing the dredged sediment, and uniformly mixing the dredged sediment and the composite modifier; s5, paving the dredged sediment above the heavy metal barrier layer again, and having the advantages that the sediment can be tempered nearby and recovered for use without being transported to other sites.
Description
Technical Field
The invention relates to the technical field of riverbed pollution treatment, in particular to a method for repairing and treating bottom mud of an urban black and odorous riverway.
Background
The bottom mud repairing method is one kind of treating method for improving river bottom environment.
The method comprises the steps of firstly washing pebbles, broken stones and coarse sand in the dredged sediment, carrying out sludge-water separation after the sediment is subjected to thermal refining treatment, and screening the slurry after the sludge-water separation to remove fine sand and coarse mud. And then carrying out mud-water separation on the slurry, conditioning the bottom mud with higher concentration by using a flocculating agent, dehydrating the conditioned slurry, and mixing and stirring the dehydrated bottom mud and a stabilizing agent solution to carry out stable solidification treatment.
However, the method needs to transport the sediment to other sites for processing and stacking, and has high transportation cost and inconvenient operation, so the method needs to be improved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for repairing and treating bottom mud of an urban black and odorous river, which has the advantages that the bottom mud can be tempered nearby and recovered for reuse without being transported to other fields.
In order to achieve the purpose, the invention provides the following technical scheme:
1. a method for repairing and treating bottom mud of an urban black and odorous river comprises the following steps:
s1, dredging and piling bottom mud at the bottom of the river channel, wherein the bottom mud is 25-30cm in length, and piling the bottom mud to the two sides of the river channel;
s2, paving a heavy metal barrier layer at the bottom of the dug river channel;
s3, airing the dredged sediment, and ploughing the sediment through ploughing equipment;
s4, throwing the composite modifier in the process of ploughing the dredged sediment, and uniformly mixing the dredged sediment and the composite modifier;
and S5, re-paving the dredged sediment above the heavy metal barrier layer.
By adopting the technical scheme, the upper-layer bottom mud at the bottom of the river channel is dredged and then stacked along the two sides of the river channel, so that the river channel is naturally aired, the water content of the river channel is reduced, and the river channel is convenient to be fully contacted with air subsequently; isolating the deep bottom mud by a heavy metal barrier layer; then, ploughing the dredged bottom mud through ploughing equipment so that all parts of the bottom mud can be fully contacted with air, so that sediments (namely volatile sulfides) in the bottom mud can be naturally repaired after being contacted with the air under the characteristics of easy oxidation and easy volatilization of the sediments, the frequency of artificial interference is reduced, and oxygen conditions are created for the bottom mud through ploughing so that most of the volatile sulfides in the bottom mud are naturally oxidized and volatilized; then, the modifier is added to assist the sulfide in the bottom mud to carry out chemical passivation so as to further reduce the sulfide in the bottom mud; finally, seeds or seedlings of aquatic plants are embedded in the sediment, the sediment is paved to the bottom of the river channel again, and the water is poured into the river channel again, and then the water can be self-regulated under the action of the aquatic plants; the method has the advantages that the bottom mud can be tempered nearby and recovered for use without being transported to other sites.
Further, in the step S1, the width of the bottom mud stacked along the two sides of the river channel is 5% -9% of the width of the river channel.
Through adopting above-mentioned technical scheme, can be so that the width of the bed mud of stacking can not occupy great area, reduce because of the influence of bed mud restoration cause to river course both sides space availability.
Further, in the step S3, the bottom mud needs to be aired to a water content of 40% -50%.
Through adopting above-mentioned technical scheme, just can let the sulphide in the bed mud contact with the air better after reducing the water content of bed mud, oxidation that just can be better volatilize, improve the repair efficiency of bed mud.
Further, in the step S3, when the bottom mud is ploughed, the bottom mud surface is laid in a wave shape.
Through adopting above-mentioned technical scheme, can make the area on bed mud surface bigger, promptly with the area of contact of air bigger to further make the repair efficiency of bed mud higher.
Further, in step S2, an impermeable layer is laid over the heavy metal barrier layer.
By adopting the technical scheme, the impermeable layer can prevent the water body from leaking after the water body is poured into the river channel again in the follow-up process, so that the water body and the deep sludge below the heavy metal barrier layer are not influenced by each other, and the environment stability of the follow-up water body is facilitated.
Further, in step S5, after the bottom sediment is laid, seeds of aquatic plants are embedded in the bottom sediment.
By adopting the technical scheme, the water body in the river channel can be naturally restored through the aquatic plants, the aquatic plants can be plants of chondrus and foxtail algae, and when the aquatic plants grow to form a certain scale, the aquatic plants can provide dissolved oxygen necessary for growth for other organisms in the river channel and can remove excessive nutrients in water, so that the growth of algae is controlled, and the environment in the river channel is better maintained.
Furthermore, the plowing equipment comprises a compression roller, two pairs of guide rails are arranged below the compression roller and are parallel to each other, guide wheels which can be abutted against any pair of guide rails are connected to two end walls of the compression roller, the guide wheels and the compression roller are coaxial, the distance between each guide wheel and the compression roller is larger than that between the two guide rails, and a plurality of convex rings are fixedly sleeved on the side wall of the compression roller along the length direction of the side wall of the compression roller.
Through adopting above-mentioned technical scheme, the accessible rotates the compression roller in order to realize the extrusion of bulge loop to the bed mud to can make inside everywhere of bed mud all have the opportunity directly to expose in the air, make it oxidize and volatilize better, and through placing the leading wheel respectively on two pairs of guided ways can realize extrudeing the bed mud different positions, compare in carrying out extruded ploughing effect better to the bed mud along single straight line.
Further, in the step S3, during plowing, the two guide rails are placed on two sides of the bottom mud to be plowed, the guide wheels on two sides of the press roller are placed on one pair of the guide rails, the press roller is rolled, the bottom mud to be plowed can be pressed into a wavy shape through the plurality of convex rings, the guide wheels on two sides of the press roller are placed on the other pair of the guide rails, the plurality of convex rings are located right above a plurality of vertexes of the wavy bottom mud pressed before, the press roller is rolled afterwards, the top end of the wavy bottom mud pressed before is pressed down through the plurality of convex rings, the bottom mud originally located inside is exposed, and all the bottom mud can be exposed to the air.
Through adopting above-mentioned technical scheme, can destroy the bed mud of wavy and reorganize and be the bed mud of new wavy, can make bed mud everywhere all can with air direct contact for the repair rate of bed mud is faster.
Furthermore, the bottom mud top that is located the river course both sides is equipped with the blanking storehouse, blanking storehouse diapire is equipped with a plurality of blanking holes, blanking storehouse diapire rotates and is connected with a plurality of pairs of gyro wheels, and a plurality of pairs of gyro wheels butt respectively is on one of them a pair of guided way.
Through adopting above-mentioned technical scheme, when needs shed compound amendment, directly place compound amendment in blanking storehouse, promote blanking storehouse at the uniform velocity along the length direction of guided way afterwards can be with compound amendment even spilling to the bed mud surface, compare in artifical manual more even of shedding.
Further, in the step S4, the composite modifier is placed in the blanking bin, and then the blanking bin is pushed along the length direction of the guide rail, so that the composite modifier can uniformly fall above the sediment to be ploughed through the plurality of blanking holes.
By adopting the technical scheme, the composite modifying agent is uniformly mixed and then placed in the blanking bin, the uniform blanking of the composite modifying agent can be realized by pushing the blanking bin at a uniform speed, and the operation is convenient.
In conclusion, the invention has the following beneficial effects:
1. the following steps are adopted: s1, dredging and piling bottom mud at the bottom of the river channel, wherein the bottom mud is 25-30cm in length, and piling the bottom mud to the two sides of the river channel; s2, paving a heavy metal barrier layer at the bottom of the dug river channel; s3, airing the dredged sediment, and ploughing the sediment through ploughing equipment; s4, throwing the composite modifier in the process of ploughing the dredged sediment, and uniformly mixing the dredged sediment and the composite modifier; s5, paving the dredged sediment above the heavy metal barrier layer again; dredging the upper-layer bottom mud at the bottom of the river channel, stacking along two sides of the river channel, and naturally airing to reduce the water content of the river channel, so that the river channel can be conveniently and fully contacted with air subsequently; isolating the deep bottom mud by a heavy metal barrier layer; then, ploughing the dredged bottom mud through ploughing equipment so that all parts of the bottom mud can be fully contacted with air, so that sediments (namely volatile sulfides) in the bottom mud can be naturally repaired after being contacted with the air under the characteristics of easy oxidation and easy volatilization of the sediments, the frequency of artificial interference is reduced, and oxygen conditions are created for the bottom mud through ploughing so that most of the volatile sulfides in the bottom mud are naturally oxidized and volatilized; then, the modifier is added to assist the sulfide in the bottom mud to carry out chemical passivation so as to further reduce the sulfide in the bottom mud; finally, seeds or seedlings of aquatic plants are embedded in the sediment, the sediment is paved to the bottom of the river channel again, and the water is poured into the river channel again, and then the water can be self-regulated under the action of the aquatic plants; the method has the advantages that the bottom mud can be tempered nearby without being transported to other sites and can be reused;
2. in step S5, after the bottom mud is paved, seeds of aquatic plants are embedded in the bottom mud; the aquatic plants can be used for naturally restoring the water body in the riverway, the aquatic plants can be plants of chondrus and foxtail algae, and when the aquatic plants grow to form a certain scale, the aquatic plants can provide dissolved oxygen necessary for the growth of other organisms in the riverway and can remove excessive nutrients in water, so that the growth of algae is controlled, and the environment in the riverway is better maintained.
Drawings
FIG. 1 is a schematic structural diagram of the present embodiment;
FIG. 2 is an enlarged view taken at A in FIG. 1;
FIG. 3 is an enlarged view of FIG. 1 at B;
FIG. 4 is an enlarged view at C of FIG. 1;
fig. 5 is a schematic structural diagram for showing a positional relationship between the blanking hole and the blanking bin in this embodiment.
In the figure: 1. a river channel; 11. bottom mud; 12. a metal barrier layer; 13. an impermeable layer; 2. ploughing equipment; 21. a compression roller; 22. a guide rail; 23. a guide wheel; 24. a convex ring; 3. a blanking bin; 30. a blanking hole; 31. and a roller.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example (b):
a method for repairing and treating bottom mud of an urban black and odorous river comprises the following steps:
s1, referring to FIG. 1, firstly, the water in the river channel 1 is pumped out, then, bottom mud 11 with the length of 25-30cm at the bottom of the river channel 1 is dredged and stacked to the two sides of the river channel 1, and the stacking width of the bottom mud 11 along the two sides of the river channel 1 is controlled to be 5% -9% of the width of the river channel 1.
S2, referring to fig. 2, a heavy metal barrier layer 12 is laid on the bottom of the dug river channel 1, wherein the heavy metal barrier layer 12 is preferably a concrete layer for isolating the deep black and odorous bottom mud 11. Furthermore, a barrier layer 13 is laid over the heavy metal barrier layer 12, the barrier layer 13 preferably being a HDPE barrier film (i.e. a high density polyethylene film, relative density 0.918-0.965).
S3, referring to FIG. 1, airing the dredged sediment 11 until the water content of the sediment 11 is 40-50%. During the period, the bottom sediment 11 is ploughed through the ploughing equipment 2, and the surface of the bottom sediment 11 is wavy in the process of ploughing the bottom sediment 11, so that the contact area between the bottom sediment 11 and the air is larger.
Referring to fig. 3 and 4, the tilling device 2 includes a pressing roller 21, two pairs of guide rails 22 are disposed below the pressing roller 21, the two pairs of guide rails 22 are parallel to each other, guide wheels 23 are fixedly connected to both end walls of the pressing roller 21, the guide wheels 23 and the pressing roller 21 are coaxial, the distance between the guide wheels 23 and the pressing roller 21 is greater than the distance between the two guide rails 22, and the two guide wheels 23 can be abutted to any pair of guide rails 22. The side wall of the press roller 21 is integrally provided with a plurality of convex rings 24 along the length direction, and the cross section of each convex ring 24 is triangular.
Referring to fig. 3 and 4, in step S3, during plowing, two guide rails 22 are first placed on both sides of the bottom mud 11 to be plowed, then the guide wheels 23 on both sides of the press roll 21 are first placed on one pair of guide rails 22, then the press roll 21 is rolled, the surface of the bottom mud 11 is pressed into a wavy shape by the plurality of convex rings 24, then the guide wheels 23 on both sides of the press roll 21 are placed on the other pair of guide rails 22, so that the plurality of convex rings 24 are located right above the plurality of vertexes of the previously pressed wavy bottom mud 11, then the press roll 21 is rolled, and the top end of the previously pressed wavy bottom mud 11 is pressed downwards and cut by the plurality of convex rings 24, so that the bottom mud 11 in the original position is exposed, and all positions of the bottom mud 11 can be exposed to the air.
S4, referring to fig. 4, the composite modifier is thrown during the plowing of the dredged sediment 11, the composite modifier is preferably a mixture of hydrated lime and iron slag, and the composite modifier is preferably a 140-mesh powder. Evenly mixing the dredged sediment 11 with the composite modifier.
Referring to fig. 4 and 5, a blanking bin 3 is arranged above the sediment 11 to be ploughed, a plurality of blanking holes 30 are formed in the bottom wall of the blanking bin 3, a plurality of pairs of rollers 31 are rotatably connected to the bottom wall of the blanking bin 3 through a rotating shaft, and the plurality of pairs of rollers 31 abut against one pair of guide rails 22 respectively.
Referring to fig. 4, in step S4, when the compound modifier needs to be thrown, the powdered compound modifier is first placed in the blanking bin 3, and then the blanking bin 3 is pushed at a constant speed along the length direction of the guide rail 22, so that the compound modifier can be uniformly dropped onto the bottom mud 11 to be ploughed through the plurality of blanking holes 30.
Referring to fig. 1, the modifier is repeatedly thrown and the bottom mud 11 is repeatedly ploughed, so that the composite modifier and the bottom mud 11 can be sufficiently mixed.
S5, referring to FIG. 2, seeds or seedlings of aquatic plants are embedded in the dredged sediment 11 and are paved above the heavy metal barrier layer 12 and the impermeable layer 13 again, preferably, the aquatic plants are plants of chondrus and foxtail algae, and when the aquatic plants grow to a certain scale, the aquatic plants can provide dissolved oxygen necessary for the growth of other organisms in the riverway 1 and can remove excessive nutrients in water, so that the growth of algae is controlled.
The working principle is as follows: dredging the upper-layer bottom mud 11 at the bottom of the river channel 1, stacking along two sides of the river channel 1, and naturally airing to reduce the water content of the river channel and facilitate the subsequent full contact with air; the deep bed mud 11 is isolated by concrete; the bottom mud 11 that dredges is ploughed through ploughing equipment 2 afterwards to make bottom mud 11 everywhere all can fully contact with the air, so that the deposit of bottom mud 11 inside is volatile sulphide under its easy oxidation, volatile characteristic, can let it carry out the nature restoration after contacting with the air, reduces artificial interference's frequency, creates the oxygen condition for bottom mud 11 through ploughing, makes most volatile sulphide inside naturally oxidize and volatilize. Thereafter the sulphide in the bottom sludge 11 is assisted by the added amendment to perform chemical passivation to further reduce the sulphide in the bottom sludge 11. Finally, seeds or seedlings of aquatic plants are embedded in the bottom mud 11, the seeds or seedlings are paved at the bottom of the river channel 1 again, the water is poured into the river channel again, and then the water can be self-regulated under the action of the aquatic plants. The method has the advantages that the bottom mud 11 can be tempered nearby and recovered for use without transporting the bottom mud 11 to other places, and the method is convenient to operate and low in cost.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. A method for repairing and treating bottom mud of an urban black and odorous river is characterized by comprising the following steps:
s1, dredging 25-30cm of bottom mud (11) at the bottom of the river channel (1) and stacking the bottom mud to the two sides of the river channel (1);
s2, paving a heavy metal barrier layer (12) at the bottom of the dug river channel (1);
s3, airing the dredged sediment (11), and ploughing the sediment (11) by the ploughing equipment (2) in the airing period;
s4, throwing the composite modifier in the process of turning the dredged sediment (11), and uniformly mixing the dredged sediment (11) and the composite modifier;
and S5, re-paving the dredged sediment (11) above the heavy metal barrier layer (12).
2. The method for repairing and treating the bottom mud of the urban black and odorous river according to claim 1, wherein the method comprises the following steps: in the step S1, the width of the bottom mud (11) stacked along the two sides of the river channel (1) is 5% -9% of the width of the river channel (1).
3. The method for repairing and treating the bottom mud of the urban black and odorous river according to claim 1, wherein the method comprises the following steps: in the step S3, the bottom mud (11) needs to be aired until the water content is 40% -50%.
4. The method for repairing and treating the bottom mud of the urban black and odorous river according to claim 1, wherein the method comprises the following steps: in the step S3, when the bottom mud (11) is ploughed, the surface of the bottom mud (11) is paved into a wave shape.
5. The method for repairing and treating the bottom mud of the urban black and odorous river according to claim 1, wherein the method comprises the following steps: in the step S2, an impermeable layer (13) is laid on the heavy metal barrier layer (12).
6. The method for repairing and treating the bottom mud of the urban black and odorous river according to claim 1, wherein the method comprises the following steps: in the step S5, after the bottom sediment (11) is laid, seeds of aquatic plants are embedded in the bottom sediment (11).
7. The method for repairing and treating the bottom mud of the urban black and odorous river according to claim 1, wherein the method comprises the following steps: ploughing equipment (2) includes compression roller (21), compression roller (21) below is equipped with two pairs of guided way (22), and two pairs of guided way (22) are parallel to each other, compression roller (21) both ends wall all is connected with leading wheel (23) that can supply arbitrary pair guided way (22) butt, leading wheel (23) and compression roller (21) are coaxial, the interval of leading wheel (23) and compression roller (21) is greater than the interval of two guided ways (22), the fixed cover of compression roller (21) lateral wall is equipped with a plurality of bulge loops (24) along its length direction.
8. The method for repairing and treating the bottom mud of the urban black and odorous river channel according to claim 7, wherein the method comprises the following steps: in the step S3, during plowing, two guide rails (22) are first placed on two sides of the bottom mud (11) to be plowed, then the guide wheels (23) on two sides of the press roll (21) are first placed on one pair of guide rails (22), then the press roll (21) is rolled, the bottom mud (11) to be plowed can be pressed into a wavy shape through a plurality of convex rings (24), then the guide wheels (23) on two sides of the press roll (21) are placed on the other pair of guide rails (22), so that the plurality of convex rings (24) are located right above a plurality of vertexes of the wavy bottom mud (11) pressed before, then the press roll (21) is rolled, and the top ends of the wavy bottom mud (11) pressed before are pressed down through the plurality of convex rings (24) to expose the bottom mud (11) originally located inside, so that all the bottom mud (11) can be exposed to the air.
9. The method for repairing and treating the bottom mud of the urban black and odorous river channel according to claim 7, wherein the method comprises the following steps: sediment (11) top that is located river course (1) both sides is equipped with blanking bin (3), blanking bin (3) diapire is equipped with a plurality of blanking holes (30), blanking bin (3) diapire rotates and is connected with a plurality of pairs of gyro wheels (31), and a plurality of pairs of gyro wheels (31) butt respectively on one of them a pair of guided way (22).
10. The method for repairing and treating the bottom mud of the urban black and odorous river according to claim 9, wherein the method comprises the following steps: in the step S4, the composite modifying agent is placed in the blanking bin (3), and then the blanking bin (3) is pushed along the length direction of the guide rail (22), so that the composite modifying agent can uniformly fall above the sediment (11) to be ploughed through the plurality of blanking holes (30).
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| CN201910793280.9A CN110590103A (en) | 2019-08-27 | 2019-08-27 | Bottom mud restoration and treatment method for urban black and odorous riverway |
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| CN201910793280.9A CN110590103A (en) | 2019-08-27 | 2019-08-27 | Bottom mud restoration and treatment method for urban black and odorous riverway |
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