CN104961323A - Dredged slurry dehydration method based on slurry cake permeability - Google Patents
Dredged slurry dehydration method based on slurry cake permeability Download PDFInfo
- Publication number
- CN104961323A CN104961323A CN201510391789.2A CN201510391789A CN104961323A CN 104961323 A CN104961323 A CN 104961323A CN 201510391789 A CN201510391789 A CN 201510391789A CN 104961323 A CN104961323 A CN 104961323A
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- China
- Prior art keywords
- mud
- suction filtration
- dredging
- slurry
- dewatering
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- 230000035699 permeability Effects 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title abstract description 20
- 230000018044 dehydration Effects 0.000 title abstract description 8
- 238000006297 dehydration reaction Methods 0.000 title abstract description 8
- 239000002002 slurry Substances 0.000 title abstract 16
- 238000000967 suction filtration Methods 0.000 claims abstract description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 230000007704 transition Effects 0.000 claims abstract description 19
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 238000005189 flocculation Methods 0.000 claims description 28
- 230000016615 flocculation Effects 0.000 claims description 28
- 239000003795 chemical substances by application Substances 0.000 claims description 27
- 239000004746 geotextile Substances 0.000 claims description 23
- 238000003828 vacuum filtration Methods 0.000 claims description 12
- 238000004062 sedimentation Methods 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 229920002401 polyacrylamide Polymers 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 abstract description 10
- 239000004744 fabric Substances 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 231100000245 skin permeability Toxicity 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 230000008719 thickening Effects 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
-
- 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
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a dredged slurry dehydration method based on slurry cake permeability. The dredged slurry dehydration method comprises the following steps of (a) adding flocculant to dredged slurry, so as to form transition slurry containing floc; (b) performing suction filtration on the transition slurry by using geotechnical cloth as a filtering medium, so that slurry cakes are formed on the surface of the geotechnical cloth, and continuously performing suction filtration, so that mud and water of the transition slurry are separated. According to the dredged slurry dehydration method based on the slurry cake permeability, the slurry cakes are generated by the formed floc in the process of suction filtration, so that good permeability is achieved, and continuous suction can be performed, the geotechnical cloth can be prevented from being blocked, the water can be permitted to pass through, continuous dehydration is realized, quick reduction of the slurry is realized, the required space is small, the slurry treatment efficiency is improved, and the slurry treatment cost is reduced.
Description
Technical field
The present invention relates to a kind of mud dewaterion method, be specifically related to a kind of dredging mud vacuum filtration dewatering permeable based on mud skin.
Background technology
In order to improve river and lake water quality, ensure the normal flood carrying capacity in river course and and Navigation capacity, large-scale dredging and desilting engineering are all being carried out in the lake of China, river course.These dredging mud water ratio are high, and density is low, are difficult to direct utilization.
Existing treatment process has the mud-water separation technology by cyclonic separation, filter press, or carry out precipitating in stockyard, storing technology.There is a series of problem when processing dredging silt in these technology: 1, cyclonic separation is poor for the treatment of mud effect that the particle being less than 45 microns containing particle diameter is more; 2, filter press processed in units amount is low, and equipment investment is large, does not mate with desilting amount; Stockyard precipitation floor space is large, and the time cycle is long.Therefore, need to seek dewatering fast and efficiently, to improve the efficiency of process, reduce treatment of mud cost.
The at present existing vacuum filtration method utilizing geotextile process high-moisture percentage mud, but due to fine particle in mud a lot, can cause the blocking of filter cloth immediately when suction filtration, dewatering efficiency reduces rapidly, is difficult to use in the lasting dehydration of a large amount of dredging mud.Therefore need to seek one dewatering fast and efficiently.
Summary of the invention
The present invention seeks to provide a kind of dredging mud dewatering permeable based on mud skin to overcome the deficiencies in the prior art.
For achieving the above object, the technical solution used in the present invention is: a kind of dredging mud dewatering permeable based on mud skin, and it comprises the following steps successively:
A () adds flocculation agent and forms the transition mud containing floc sedimentation in dredging mud;
B () take geotextile as filtration medium, carry out suction filtration make to form mud skin at described Geotextile and continue suction filtration to make described transition mud mud-water separation to described transition mud.
Optimally, in step (b), described geotextile is 150 ~ 400 orders.
Optimally, in step (b), described geotextile is covered in the surface of vacuum filtration pipe, described vacuum filtration pipe is inserted in described transition mud carry out suction filtration subsequently.
Further, in step (b), the negative pressure of vacuum of 75 ~ 105Kpa is provided to carry out suction filtration by vacuum pump to described vacuum filtration pipe.
Further, in step (b), along with the carrying out of suction filtration, the thickness of mud skin increased before this gradually, last substantially constant, and in the process, the permeability coefficient of mud skin is also change, and concrete, in the starting stage of suction filtration, the permeability coefficient of mud skin is about 1*10
-3cm/s ~ 9*10
-3cm/s, suction filtration is after 1 ~ 3 hour, and the permeability coefficient of mud skin is about 1*10
-4cm/s ~ 9*10
-4cm/s.Therefore, whole suction filtration process, all remains very high water-permeable.
Further, in step (b), the starting velocity of described suction filtration is 0.2 ~ 0.5g/cm
2s, was down to 0.1 ~ 0.15g/cm after 1 ~ 3 hour
2s, continues water ratio≤254% of suction filtration to mud.
Optimally, in step (a), described floc sedimentation is of a size of 0.1mm ~ 2mm.
Further, in step (a), described flocculation agent is one or more the combination in polyacrylamide, iron ion flocculation agent and aluminum ion flocculation agent.
Further, add that weight is described dredging mud dry weight 0.1% ~ 0.5% of described polyacrylamide, add that weight is described dredging mud dry weight 10% ~ 15% of described iron ion flocculation agent or described aluminum ion flocculation agent.
Further, in step (a), the water ratio of described dredging mud is 570% ~ 1150%.
Because technique scheme is used, the present invention compared with prior art has following advantages: the present invention is based on the dredging mud dewatering that mud skin is permeable, the mud leatherware produced in suction filtration process by the floc sedimentation formed has good water-permeable, can carry out continuing to draw water, can prevent geotextile from blocking and moisture can be allowed again to pass through the dehydration realizing continuing, reach the quick decrement of mud, the place of needs is little, improve treatment of mud efficiency, reduce treatment of mud cost.
Embodiment
The present invention is based on the dredging mud dewatering that mud skin is permeable, it comprises the following steps successively: (a) adds flocculation agent and form the transition mud containing floc sedimentation in dredging mud; B () take geotextile as filtration medium, carry out suction filtration make to form mud skin at described Geotextile and continue suction filtration to make described transition mud mud-water separation to described transition mud.The mud skin produced by adding flocculation agent has good water-permeable (to add the mud skin permeability coefficient that formed after flocculation agent the chances are at first 10
-3cm/s level, along with the carrying out of suction filtration can drop to 10
-4/ s level, this process has very high water-permeable always), can prevent geotextile from blocking like this and moisture can be allowed again to pass through the dehydration realizing continuing, reach the quick decrement of mud, the place of needs is little, improves treatment of mud efficiency, simplify construction technology, reduce treatment of mud cost.
In step (b), geotextile is preferably 150 ~ 400 orders, and the words that geotextile order number is too large easily cause sludge blockage, and the too little words filter effect of geotextile order number is bad; And the thickness of mud skin be with the suction filtration time increase and thicken, the thickest can to 4cm.The application mode of suction filtration mode and geotextile has multiple, in order to improve the processing efficiency of dredging mud in the present invention, geotextile is covered the surface of vacuum filtration pipe, is inserted in transition mud by vacuum filtration pipe subsequently and carries out suction filtration; The negative pressure of vacuum of 75 ~ 105Kpa is provided to carry out suction filtration by vacuum pump to vacuum filtration pipe again.Along with the carrying out of vacuum filtration, the mud skin consolidation gradually that the water ratio due to dredging mud reduces gradually and formed, suction filtration becomes more and more difficult, therefore, under this condition of negative pressure, the starting velocity about 0.2 ~ 0.5g/cm of suction filtration
2s, was about 0.1 ~ 0.15g/cm after 1 ~ 3 hour
2s, continuation suction filtration can terminate suction filtration to water ratio≤254% of mud.When certain water ratio reaches 254%, still can continue suction filtration, only suction filtration efficiency step-down, so consider from cost-saving angle, preferably stop suction filtration when water ratio reaches about 254%.
In order to make mud leatherware have good permeability coefficient, the size of flocculate (maximum length or width) controlling to be formed is 0.1mm ~ 2mm, and flocculation agent is preferably one or more the combination in polyacrylamide, iron ion flocculation agent and aluminum ion flocculation agent.The add-on of flocculation agent is very important parameter, different flocculation agents needs to add different weight, as add that weight is dredging mud dry weight 0.1% ~ 0.5% of polyacrylamide, add that weight is dredging mud dry weight 10% ~ 15% of iron ion flocculation agent or described aluminum ion flocculation agent.Generally, in step (a), the water ratio of dredging mud (water ratio equals (weight in wet base-dry weight)/dry weight × 100%) is 570% ~ 1150%.
To be described in detail to the preferred embodiment of the invention below:
Embodiment 1
The present embodiment provides a kind of dredging mud dewatering permeable based on mud skin, and wherein dredging mud selects the dredging silt in Taihu Lake, and water ratio is 900%, and the method comprises the following steps successively:
A () gets the Taihu Lake dredging mud (dry weight 1.54kg) that 15.4kg water ratio is 900%, add 7.7g flocculation agent PAM wherein, stir, and forms the floc sedimentation (size herein refers to mean sizes, lower same) being about 0.1 ~ 0.5mm;
(b) to transition mud (transition mud be above the title of dredging silt after process flocculation treatment, herein just in order to come from distinguish with dredging mud above nominally) middle placement surface amasss as 7.07cm
2suction filtration head, suction filtration head surface cover has 400 object geotextile, utilizes vacuum pump to apply the negative pressure (suction filtration pressure remains unchanged in suction filtration process) of 75Kpa to suction filtration head, start suction filtration, form mud skin at Geotextile, the starting stage permeability coefficient of mud skin is higher, and suction filtration speed can reach 0.3g/cm
2s, mud skin is thickening gradually afterwards, and suction filtration speed slowly declines, and suction filtration is after 2 hours, and permeability coefficient decreases, but still has very high water-permeable, and suction filtration speed is about 0.1g/cm
2s, after 1 hour, mud moisture content drops to 230%.
Embodiment 2
The present embodiment provides a kind of dredging mud dewatering permeable based on mud skin, and wherein dredging mud selects the dredging silt in Taihu Lake, and water ratio is 1150%, and the method comprises the following steps successively:
A () gets the Taihu Lake dredging mud (dry weight 2kg) that 25kg water ratio is 1150%, add 0.2kg iron ion flocculation agent wherein, stir, and forms the floc sedimentation being about 1.0 ~ 1.5mm;
B () amasss as 7.07cm to placement surface in transition mud
2suction filtration head, suction filtration head surface cover has 150 object geotextile, and utilize vacuum pump to apply the negative pressure of 105Kpa to suction filtration head, start suction filtration, starting stage suction filtration speed can reach 0.2g/cm
2s, suction filtration speed slowly declines afterwards, and suction filtration is after 1 hour, and suction filtration speed is down to 0.1g/cm
2s, after 4 hours, mud moisture content drops to 250%.
Embodiment 3
The present embodiment provides a kind of dredging mud dewatering permeable based on mud skin, and wherein dredging mud selects the dredging silt in Taihu Lake, and water ratio is 570%, and the method comprises the following steps successively:
A () gets the Taihu Lake dredging mud (dry weight 3kg) that 20kg water ratio is 570%, add the mixture of 0.45kg iron ion flocculation agent and aluminum ion flocculation agent wherein, stir, and forms the floc sedimentation (size herein refers to mean sizes) of 1.5 ~ 2mm;
B () amasss as 7.07cm to placement surface in transition mud
2suction filtration head, suction filtration head surface cover has 300 object geotextile, and utilize vacuum pump to apply the negative pressure of 80Kpa to suction filtration head, start suction filtration, starting stage suction filtration speed can reach 0.5g/cm
2s, suction filtration speed slowly declines afterwards, and suction filtration is after 3 hours, and suction filtration speed is down to 0.15g/cm
2s, after 3 hours, mud moisture content drops to 254%.
Comparative example 1
This comparative example is substantially identical with the step in embodiment 1, does not add flocculation agent, be specially unlike in this comparative example:
A () gets the Taihu Lake dredging mud (dry weight 1.54kg) that 15.4kg water ratio is 900%;
B () amasss as 7.07cm to placement surface in mud
2suction filtration head, suction filtration head surface cover has 400 object geotextile, utilizes vacuum pump to apply the negative pressure of 75Kpa to suction filtration head, blocks at once after suction filtration.
Above-described embodiment is only for illustrating technical conceive of the present invention and feature; its object is to person skilled in the art can be understood content of the present invention and implement according to this; can not limit the scope of the invention with this; all equivalences done according to spirit of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (10)
1., based on the dredging mud dewatering that mud skin is permeable, it is characterized in that, it comprises the following steps successively:
A () adds flocculation agent and forms the transition mud containing floc sedimentation in dredging mud;
B () take geotextile as filtration medium, carry out suction filtration make to form water-permeable good mud skin at described Geotextile and can continue suction filtration and make described transition mud mud-water separation described transition mud.
2. the dredging mud dewatering permeable based on mud skin according to claim 1, is characterized in that: in step (b), and described geotextile is 150 ~ 400 orders.
3. the dredging mud dewatering permeable based on mud skin according to claim 1, is characterized in that: in step (b), described geotextile is covered in the surface of vacuum filtration pipe, is inserted in described transition mud by described vacuum filtration pipe subsequently and carries out suction filtration.
4. the dredging mud dewatering permeable based on mud skin according to claim 3, is characterized in that: in step (b), provides the negative pressure of vacuum of 75 ~ 105Kpa to carry out suction filtration by vacuum pump to described vacuum filtration pipe.
5. the dredging mud dewatering permeable based on mud skin according to claim 1 or 4, is characterized in that: in step (b), along with the carrying out of suction filtration, the thickness of mud skin increased before this gradually, last substantially constant, in the starting stage of suction filtration, the permeability coefficient of mud skin is 1*10
-3cm/s ~ 9*10
-3cm/s, suction filtration is after 1 ~ 3 hour, and the permeability coefficient of mud skin is 1*10
-4cm/s ~ 9*10
-4cm/s.
6. the dredging mud dewatering permeable based on mud skin according to claim 4, is characterized in that: in described step (b), and the starting velocity of described suction filtration is 0.2 ~ 0.5g/cm
2s, was down to 0.1 ~ 0.15g/cm after 1 ~ 3 hour
2s, continues water ratio≤254% of suction filtration to mud.
7. the dredging mud dewatering permeable based on mud skin according to claim 1, it is characterized in that: in step (a), described floc sedimentation is of a size of 0.1mm ~ 2mm.
8. the dredging mud dewatering permeable based on mud skin according to claim 1 or 7, is characterized in that: in step (a), and described flocculation agent is one or more the combination in polyacrylamide, iron ion flocculation agent and aluminum ion flocculation agent.
9. the dredging mud dewatering permeable based on mud skin according to claim 8, it is characterized in that: add that weight is described dredging mud dry weight 0.1% ~ 0.5% of described polyacrylamide, add that weight is described dredging mud dry weight 10% ~ 15% of described iron ion flocculation agent or described aluminum ion flocculation agent.
10. the dredging mud dewatering permeable based on mud skin according to claim 1, is characterized in that: in step (a), and the water ratio of described dredging mud is 570% ~ 1150%.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510391789.2A CN104961323B (en) | 2015-07-07 | 2015-07-07 | A kind of dredging mud dewatering based on mud transdermally water |
| PCT/CN2016/070031 WO2017004968A1 (en) | 2015-07-07 | 2016-01-04 | Mud cake water permeability-based dredged slurry dehydration method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510391789.2A CN104961323B (en) | 2015-07-07 | 2015-07-07 | A kind of dredging mud dewatering based on mud transdermally water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104961323A true CN104961323A (en) | 2015-10-07 |
| CN104961323B CN104961323B (en) | 2017-06-09 |
Family
ID=54215453
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510391789.2A Expired - Fee Related CN104961323B (en) | 2015-07-07 | 2015-07-07 | A kind of dredging mud dewatering based on mud transdermally water |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104961323B (en) |
| WO (1) | WO2017004968A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017004968A1 (en) * | 2015-07-07 | 2017-01-12 | 河海大学 | Mud cake water permeability-based dredged slurry dehydration method |
| CN107505245A (en) * | 2017-08-29 | 2017-12-22 | 上海市基础工程集团有限公司 | Flocculant and chain cloth performance detection test method |
| CN107607467A (en) * | 2017-08-29 | 2018-01-19 | 上海市基础工程集团有限公司 | Fluid loss and mudcake thickness rapid assay methods |
| CN109734272A (en) * | 2019-01-09 | 2019-05-10 | 西安容达环保有限公司 | Vehicular filling pile slurry processing unit and method |
| CN113582505A (en) * | 2021-08-04 | 2021-11-02 | 江苏科技大学 | Continuous type high-water-content mud decrement hardening system and method |
| CN114105552A (en) * | 2021-10-31 | 2022-03-01 | 中交隧道工程局有限公司 | High-water-content sludge curing agent and application method thereof |
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|---|---|---|---|---|
| CN111559846A (en) * | 2020-05-12 | 2020-08-21 | 中建六局水利水电建设集团有限公司 | River channel high-water-content sludge dewatering method |
| CN114134972A (en) * | 2021-10-09 | 2022-03-04 | 江苏盐城水利建设有限公司 | Movable horizontal drainage system and dynamic consolidation dewatering process for dredging sludge storage yard based on same |
| CN114436496A (en) * | 2022-01-27 | 2022-05-06 | 浙大城市学院 | Microwave heating vacuum preloading sludge dewatering device and construction method |
| CN114506996B (en) * | 2022-02-08 | 2023-07-18 | 中国一冶集团有限公司 | Engineering slurry rapid dehydration system and dehydration method |
| CN115124204A (en) * | 2022-06-16 | 2022-09-30 | 安徽省交通航务工程有限公司 | Processing method for realizing rapid mud-water separation of dredged mud |
| CN115159811B (en) * | 2022-06-23 | 2024-06-11 | 肇庆市建筑工程有限公司 | Zero-emission underground engineering slurry treatment construction method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017004968A1 (en) * | 2015-07-07 | 2017-01-12 | 河海大学 | Mud cake water permeability-based dredged slurry dehydration method |
| CN107505245A (en) * | 2017-08-29 | 2017-12-22 | 上海市基础工程集团有限公司 | Flocculant and chain cloth performance detection test method |
| CN107607467A (en) * | 2017-08-29 | 2018-01-19 | 上海市基础工程集团有限公司 | Fluid loss and mudcake thickness rapid assay methods |
| CN109734272A (en) * | 2019-01-09 | 2019-05-10 | 西安容达环保有限公司 | Vehicular filling pile slurry processing unit and method |
| CN113582505A (en) * | 2021-08-04 | 2021-11-02 | 江苏科技大学 | Continuous type high-water-content mud decrement hardening system and method |
| CN114105552A (en) * | 2021-10-31 | 2022-03-01 | 中交隧道工程局有限公司 | High-water-content sludge curing agent and application method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104961323B (en) | 2017-06-09 |
| WO2017004968A1 (en) | 2017-01-12 |
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