CN113213671A - Desilting method for silt mixed water body - Google Patents
Desilting method for silt mixed water body Download PDFInfo
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- CN113213671A CN113213671A CN202110639825.8A CN202110639825A CN113213671A CN 113213671 A CN113213671 A CN 113213671A CN 202110639825 A CN202110639825 A CN 202110639825A CN 113213671 A CN113213671 A CN 113213671A
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- sewage
- mixed water
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000010802 sludge Substances 0.000 claims abstract description 53
- 239000010865 sewage Substances 0.000 claims abstract description 32
- 239000004576 sand Substances 0.000 claims abstract description 27
- 239000012716 precipitator Substances 0.000 claims abstract description 15
- 239000000706 filtrate Substances 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 238000004062 sedimentation Methods 0.000 claims abstract description 14
- 238000005374 membrane filtration Methods 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 238000012216 screening Methods 0.000 claims abstract description 7
- 239000004575 stone Substances 0.000 claims abstract description 7
- 239000013049 sediment Substances 0.000 claims abstract description 6
- 239000000919 ceramic Substances 0.000 claims description 12
- 239000012528 membrane Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 4
- 229960002413 ferric citrate Drugs 0.000 claims description 4
- NPFOYSMITVOQOS-UHFFFAOYSA-K iron(III) citrate Chemical compound [Fe+3].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NPFOYSMITVOQOS-UHFFFAOYSA-K 0.000 claims description 4
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims 1
- 230000003749 cleanliness Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000000945 filler Substances 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002689 soil 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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/24—Separation of coarse particles, e.g. by using sieves or screens
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention belongs to the technical field of water environment treatment, and particularly relates to a dredging method for a sediment mixed water body. It comprises the following steps: (S1) extracting a water body containing silt, and separating to obtain sand grains and high-silt sewage; (S2) digging and taking out the residual sludge after the silt-containing water body is pumped out, and screening out impurities through a vibrating screen to obtain first sludge; (S3) introducing the high-sludge sewage into a sedimentation tank, adding a precipitator to settle the sludge, and separating to obtain low-sludge sewage and second sludge; (S4) mixing the first slime with the second slime, and then sending the mixture into a filter press for filter pressing to obtain a mud cake and a filtrate; (S5) mixing the filtrate with low-sludge sewage, passing through a sand-stone filter wall, and then sending into a membrane filtration system for filtration to obtain clear water. The invention has high treatment degree and does not generate additional pollution. After treatment, mud cakes with low water content, clean water with high cleanliness and a small amount of sand grains can be obtained. The desilting method of the silt mixed water body can obtain great benefits in both the aspects of environmental protection and resources.
Description
Technical Field
The invention belongs to the technical field of water environment treatment, and particularly relates to a dredging method for a sediment mixed water body.
Background
In recent years, water environment treatment is gradually paid attention. Taking a water body with high silt content as an example, the existing treatment mode is generally rough, a large amount of silt still suspends in the water body after the silt deposit body is removed, the water body can be gradually purified only by natural sedimentation for a long time, and the purification degree is low. Moreover, the water body can cause great threat to aquatic organisms such as fish, algae and the like by keeping high silt content for a long time, and has great influence on the original ecology. In addition, the existing treatment mode can cause certain secondary pollution to the surrounding soil.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a dredging method for a silt mixed water body.
The invention is realized by the following technical scheme: a desilting method for a silt mixed water body comprises the following steps:
(S1) extracting a water body containing silt, and separating to obtain sand grains and high-silt sewage;
(S2) digging and taking out the residual sludge after the silt-containing water body is pumped out, and screening out impurities through a vibrating screen to obtain first sludge;
(S3) introducing the high-sludge sewage into a sedimentation tank, adding a precipitator to settle the sludge, and separating to obtain low-sludge sewage and second sludge;
(S4) mixing the first slime with the second slime, and then sending the mixture into a filter press for filter pressing to obtain a mud cake and a filtrate;
(S5) mixing the filtrate with low-sludge sewage, passing through a sand-stone filter wall, and then sending into a membrane filtration system for filtration to obtain clear water.
Further, in the step (S1) of the silt mixed water body dredging method, the water body containing silt is screened to remove surface floating objects and then sent into the cyclone sedimentation tank to separate sand grains.
Further, in the step (S2) of the dredging method for the sediment mixed water body, the sieve holes of the vibrating screen are rectangular, and the size of the sieve holes is preferably 10mm multiplied by 15 mm-15 mm multiplied by 25 mm.
Further, in the step (S2) of the dredging method for silt mixed water, the vibration frequency of the vibrating screen is preferably 3 to 15 Hz.
Further, in the step (S3) of the dredging method for silt mixed water, polyacrylamide is used as a precipitator, and the amount of the precipitator is 4-6 g per ton of high-silt sewage.
Further, in the step (S3) of the dredging method for silt mixed water, the precipitator is preferably a mixture of sodium metaaluminate, ferric citrate and polyaluminium chloride in a weight ratio of 10: 2-3: 6-9, and the amount of the precipitator is 3-5 g per ton of silt-laden sewage.
Further, in the step (S4) of the dredging method for silt mixed water, the operation pressure of the filter press is preferably 0.15 to 0.16 MPa.
Further, in the step (S5) of the dredging method for the sediment mixed water body, the sandstone filtration wall comprises two layers of wall bodies which are continuously arranged along the water flow direction, the first layer of wall body is preferably a gravel filler with the thickness of 800-1200 mm, and the particle size of gravel is within the range of 8-15 mm; the second layer of wall body is preferably sand grain filling bodies with the thickness of 600-800 mm, and the grain size of sand grains is within the range of 1-3 mm.
Further, in the step (S5) of the dredging method for silt mixed water body, the membrane filtration system preferably adopts a ceramic membrane as a filter element.
Further, in the step (S5) of the dredging method for silt mixed water, the aperture of the ceramic membrane is preferably 200 to 300 μm.
Has the advantages that: compared with the prior art, the silt mixed water body dredging method provided by the invention is suitable for large-scale silt mixed water body dredging and purifying treatment, has high treatment degree, does not generate additional pollution, and has small influence degree and influence time on ecological environment. After the treatment by the whole set of method, the mud cake with low water content, the clear water with high cleanliness and a small amount of sand grains are obtained, and the products can be conveniently used for subsequent utilization as resources. Therefore, the desilting method of the silt mixed water body can obtain great benefits in both the aspects of environmental protection and resources.
Detailed Description
The invention is further illustrated by the following specific examples, which are illustrative and intended to illustrate the problem and explain the invention, but not limiting.
Example 1
A desilting method for a silt mixed water body comprises the following steps:
(S1) extracting a water body containing silt, and separating to obtain sand grains and high-silt sewage;
(S2) digging and taking out the residual sludge after the silt-containing water body is pumped out, and screening out impurities through a vibrating screen to obtain first sludge;
(S3) introducing the high-sludge sewage into a sedimentation tank, adding a precipitator to settle the sludge, and separating to obtain low-sludge sewage and second sludge;
(S4) mixing the first slime with the second slime, and then sending the mixture into a filter press for filter pressing to obtain a mud cake and a filtrate;
(S5) mixing the filtrate with low-sludge sewage, passing through a sand-stone filter wall, and then sending into a membrane filtration system for filtration to obtain clear water.
In the step (S1) of this embodiment, the water containing silt is screened to remove surface floating objects and then sent to a cyclone sedimentation tank to separate sand grains.
In the step (S2) of this embodiment, the holes of the vibrating screen are rectangular holes, and the size of the holes is 10mm × 15 mm; the vibration frequency of the vibrating screen is 15 Hz.
In the step (S3) of this example, polyacrylamide was used as the precipitant, and the precipitant was used in an amount of 4g per ton of the sludge-containing wastewater.
In the step (S4) of this example, the pressure filter was operated at 0.15 MPa.
In the step (S5) of this embodiment, the gravel filter wall includes two layers of walls continuously arranged along the water flow direction, the first layer of wall is a gravel filler with a thickness of 800mm, and the particle size of gravel is within a range of 8-15 mm; the second layer of wall body is a sand grain filling body with the thickness of 600mm, and the grain size of sand grains is within the range of 1-3 mm.
In the step (S5) in this embodiment, the membrane filtration system uses a ceramic membrane as a filter element; the pore diameter of the ceramic membrane is 200 μm.
Example 2
A desilting method for a silt mixed water body comprises the following steps:
(S1) extracting a water body containing silt, and separating to obtain sand grains and high-silt sewage;
(S2) digging and taking out the residual sludge after the silt-containing water body is pumped out, and screening out impurities through a vibrating screen to obtain first sludge;
(S3) introducing the high-sludge sewage into a sedimentation tank, adding a precipitator to settle the sludge, and separating to obtain low-sludge sewage and second sludge;
(S4) mixing the first slime with the second slime, and then sending the mixture into a filter press for filter pressing to obtain a mud cake and a filtrate;
(S5) mixing the filtrate with low-sludge sewage, passing through a sand-stone filter wall, and then sending into a membrane filtration system for filtration to obtain clear water.
In the step (S1) of this embodiment, the water containing silt is screened to remove surface floating objects and then sent to a cyclone sedimentation tank to separate sand grains.
In the step (S2) of this embodiment, the holes of the vibrating screen are rectangular holes, and the size of the holes is 115mm × 25 mm; the vibration frequency of the vibrating screen is 3 Hz.
In the step (S3) of this example, polyacrylamide was used as the precipitant, and the precipitant was used in an amount of 6g per ton of the sludge-containing wastewater.
In the step (S4) of this example, the pressure filter was operated at 0.16 MPa.
In the step (S5) of this embodiment, the gravel filter wall includes two layers of walls continuously arranged along the water flow direction, the first layer of wall is a 1200mm thick gravel filler, and the gravel particle size is within a range of 8-15 mm; the second layer of wall body is a sand grain filling body with the thickness of 800mm, and the grain size of sand grains is within the range of 1-3 mm.
In the step (S5) in this embodiment, the membrane filtration system uses a ceramic membrane as a filter element; the pore diameter of the ceramic membrane is 300 μm.
Example 3
A desilting method for a silt mixed water body comprises the following steps:
(S1) extracting a water body containing silt, and separating to obtain sand grains and high-silt sewage;
(S2) digging and taking out the residual sludge after the silt-containing water body is pumped out, and screening out impurities through a vibrating screen to obtain first sludge;
(S3) introducing the high-sludge sewage into a sedimentation tank, adding a precipitator to settle the sludge, and separating to obtain low-sludge sewage and second sludge;
(S4) mixing the first slime with the second slime, and then sending the mixture into a filter press for filter pressing to obtain a mud cake and a filtrate;
(S5) mixing the filtrate with low-sludge sewage, passing through a sand-stone filter wall, and then sending into a membrane filtration system for filtration to obtain clear water.
In the step (S1) of this embodiment, the water containing silt is screened to remove surface floating objects and then sent to a cyclone sedimentation tank to separate sand grains.
In the step (S2) of this embodiment, the holes of the vibrating screen are rectangular holes, and the size of the holes is 12mm × 20 mm; the vibration frequency of the vibrating screen is 10 Hz.
In the step (S3) of this example, the precipitant is a mixture of sodium metaaluminate, ferric citrate and polyaluminium chloride in a weight ratio of 10:2:6, and the dosage of the precipitant is 3 g/ton of the high-sludge wastewater.
In the step (S4) of this example, the pressure filter was operated at 0.15 MPa.
In the step (S5) of this embodiment, the gravel filter wall includes two layers of walls continuously arranged along the water flow direction, the first layer of wall is a gravel filler with a thickness of 1000mm, and the particle size of gravel is within a range of 8-15 mm; the second layer of wall body is a sand grain filling body with the thickness of 700mm, and the grain size of sand grains is within the range of 1-3 mm.
In the step (S5) in this embodiment, the membrane filtration system uses a ceramic membrane as a filter element; the pore diameter of the ceramic membrane is 250 μm.
Example 4
A desilting method for a silt mixed water body comprises the following steps:
(S1) extracting a water body containing silt, and separating to obtain sand grains and high-silt sewage;
(S2) digging and taking out the residual sludge after the silt-containing water body is pumped out, and screening out impurities through a vibrating screen to obtain first sludge;
(S3) introducing the high-sludge sewage into a sedimentation tank, adding a precipitator to settle the sludge, and separating to obtain low-sludge sewage and second sludge;
(S4) mixing the first slime with the second slime, and then sending the mixture into a filter press for filter pressing to obtain a mud cake and a filtrate;
(S5) mixing the filtrate with low-sludge sewage, passing through a sand-stone filter wall, and then sending into a membrane filtration system for filtration to obtain clear water.
In the step (S1) of this embodiment, the water containing silt is screened to remove surface floating objects and then sent to a cyclone sedimentation tank to separate sand grains.
In the step (S2) of this embodiment, the holes of the vibrating screen are rectangular holes, and the size of the holes is 14mm × 22 mm; the vibration frequency of the vibrating screen is 5 Hz.
In the step (S3) of this example, the precipitant is a mixture of sodium metaaluminate, ferric citrate, and polyaluminum chloride in a weight ratio of 10: 3: 9, and the dosage of the precipitant is 5 g/ton of the high-sludge wastewater.
In the step (S4) of this example, the pressure filter was operated at 0.16 MPa.
In the step (S5) of this embodiment, the gravel filter wall includes two layers of walls continuously arranged along the water flow direction, the first layer of wall is a gravel filler with a thickness of 1000mm, and the particle size of gravel is within a range of 8-15 mm; the second layer of wall body is a sand grain filling body with the thickness of 700mm, and the grain size of sand grains is within the range of 1-3 mm.
In the step (S5) in this embodiment, the membrane filtration system uses a ceramic membrane as a filter element; the pore diameter of the ceramic membrane is 300 μm.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (10)
1. A desilting method for a silt mixed water body is characterized by comprising the following steps:
(S1) extracting a water body containing silt, and separating to obtain sand grains and high-silt sewage;
(S2) digging and taking out the residual sludge after the silt-containing water body is pumped out, and screening out impurities through a vibrating screen to obtain first sludge;
(S3) introducing the high-sludge sewage into a sedimentation tank, adding a precipitator to settle the sludge, and separating to obtain low-sludge sewage and second sludge;
(S4) mixing the first slime with the second slime, and then sending the mixture into a filter press for filter pressing to obtain a mud cake and a filtrate;
(S5) mixing the filtrate with low-sludge sewage, passing through a sand-stone filter wall, and then sending into a membrane filtration system for filtration to obtain clear water.
2. The method of claim 1, wherein in step (S1), the silt-laden water is screened to remove surface floating materials and then fed into a cyclone sedimentation tank to separate sand particles.
3. The dredging method for the sediment-mixed water body according to claim 1, wherein in the step (S2), the sieve holes of the vibrating screen are rectangular, and the size of the sieve holes is 10mm x 15mm to 15mm x 25 mm.
4. The dredging method for the sediment-mixed water body according to claim 3, wherein in the step (S2), the vibration frequency of the vibrating screen is 3-15 Hz.
5. The dredging method for the sediment-mixed water body according to claim 1, wherein in the step (S3), polyacrylamide is used as a precipitator, and the amount of the precipitator is 4-6 g per ton of the sediment-mixed sewage.
6. The dredging method for the sediment mixed water body according to claim 1, wherein in the step (S3), the precipitator is a mixture of sodium metaaluminate, ferric citrate and polyaluminium chloride according to a weight ratio of 10: 2-3: 6-9, and the amount of the precipitator is 3-5 g per ton of the sediment-laden sewage.
7. The dredging method for the sediment-mixed water body according to claim 1, wherein in the step (S4), the operation pressure of the filter press is 0.15 to 0.16 MPa.
8. The dredging method for the sediment mixed water body according to claim 1, wherein in the step (S5), the sandstone filtration wall comprises two layers of walls which are continuously arranged along the water flow direction, the first layer of wall is a gravel filling body with the thickness of 800-1200 mm, and the particle size of gravel is within the range of 8-15 mm; the second layer of wall body is a sand grain filling body with the thickness of 600-800 mm, and the grain size of sand grains is within the range of 1-3 mm.
9. The method for dredging a sediment-mixed water body according to claim 1, wherein in the step (S5), the membrane filtration system uses a ceramic membrane as a filter element.
10. The dredging method for the sediment-mixed water body according to claim 9, wherein in the step (S5), the pore diameter of the ceramic membrane is 200 to 300 μm.
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| JPH11300391A (en) * | 1998-04-16 | 1999-11-02 | Shoei:Kk | Material for flowable backfill, consisting of sludge and rock powder and its use |
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| WO2021101366A1 (en) * | 2019-11-20 | 2021-05-27 | Sime Darby Plantation Intellectual Property Sdn. Bhd. | Process for treating palm oil mill effluent |
-
2021
- 2021-06-09 CN CN202110639825.8A patent/CN113213671A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11300391A (en) * | 1998-04-16 | 1999-11-02 | Shoei:Kk | Material for flowable backfill, consisting of sludge and rock powder and its use |
| CN102491605A (en) * | 2011-11-16 | 2012-06-13 | 河海大学 | Construction method for carrying out high dehydration on dredging slurry by using swirling flow, condensation, and plate-and-frame |
| CN104261633A (en) * | 2014-10-16 | 2015-01-07 | 滁州友林科技发展有限公司 | High-sludge industrial sewage treatment process |
| CN107842330A (en) * | 2017-11-30 | 2018-03-27 | 河南小威环境科技有限公司 | A kind of bentonite takes rock mud purification processing method and system |
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| WO2021101366A1 (en) * | 2019-11-20 | 2021-05-27 | Sime Darby Plantation Intellectual Property Sdn. Bhd. | Process for treating palm oil mill effluent |
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Application publication date: 20210806 |