CN117003465B - Two-stage curing method and system for reducing strength loss of cured sludge - Google Patents
Two-stage curing method and system for reducing strength loss of cured sludge Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 174
- 206010003549 asthenia Diseases 0.000 title claims abstract description 14
- 238000001723 curing Methods 0.000 title abstract description 176
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 80
- 238000002156 mixing Methods 0.000 claims abstract description 49
- 238000003756 stirring Methods 0.000 claims abstract description 32
- 238000010276 construction Methods 0.000 claims abstract description 22
- 238000005096 rolling process Methods 0.000 claims abstract description 22
- 238000007711 solidification Methods 0.000 claims abstract description 18
- 230000008023 solidification Effects 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000036541 health Effects 0.000 claims abstract description 6
- 239000005416 organic matter Substances 0.000 claims description 23
- 238000012360 testing method Methods 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 10
- 238000013461 design Methods 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims 2
- 235000012255 calcium oxide Nutrition 0.000 claims 1
- 239000000292 calcium oxide Substances 0.000 claims 1
- 238000009490 roller compaction Methods 0.000 abstract description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- 239000002689 soil Substances 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 1
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- 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 discloses a two-stage curing method and a system for reducing strength loss of cured sludge, wherein the method comprises the following steps: excavating sludge and pouring the sludge into a stirring tank; determining the mixing amount of the curing agent mixed with the sludge in the first stage through a specific formula, and pouring the curing agent into a stirring tank for stirring and curing; stacking and smoldering the sludge after the first-stage solidification for health care; digging and crushing the solidified sludge in the first stage after the curing of the choke plug, and fully stirring the solidified sludge with the mixing amount of the solidifying agent in the second stage determined by a specific formula; and conveying the uniformly stirred solidified sludge to a bin surface for rolling. The two-stage curing method provided by the invention can effectively reduce the strength loss of the roller compaction type curing sludge, reduce the consumption of curing agent and save the construction cost.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering sludge solidification, in particular to a two-stage solidification method and system for reducing strength loss of solidified sludge.
Background
Hundreds of millions of river dredging sludge are generated in China each year in order to improve river water quality, guarantee river flood discharge capacity and smoothness of channels and ports. The dredging sludge has the characteristics of high water content, high compressibility, small shear strength, low direct utilization value and the like, and how to treat the dredging sludge has become a problem of wide attention in the current society. Chemical curing is a common and effective method for treating high-water-content river dredging sludge, and the method changes the physicochemical properties of the sludge by adding curing materials and chemical agents into the sludge so as to achieve the purposes of improving engineering characteristics, protecting environment and the like. In addition, the solidified sludge can be used as backfill material for recycling in projects such as embankment, road, retaining wall and the like, thereby realizing waste recycling.
Under the condition that sludge solidification and resource utilization are synchronously developed, a solidifying agent is generally mixed into the sludge at one time in engineering, and the solidified sludge after new stirring has good fluidity, so that the solidified sludge can be directly subjected to site construction by adopting a pouring method. The existing patent CN200610040093.6 'construction method of silt solidified soil', CN200810019339.0 'silt solidified method', CN201310183837.X 'a silt solidified method', CN202110003710.X 'a silt dehydration solidified system and construction method' and the like all adopt the method of one-time doping the solidifying agent to solidify the silt. However, in practical engineering application, the solidification and stirring of the sludge and the recycling of the sludge are generally asynchronous in time and space, so that the sludge is required to be subjected to solidification treatment and then is firstly placed in a temporary storage yard for smoldering and curing, and the solidified sludge is excavated and crushed and then is subjected to rolling and filling when the engineering is required, so that compacted solidified sludge with different properties from the solidified sludge is formed.
Because the solidified sludge is broken, the soil structure of the solidified sludge is damaged, and even after the solidified sludge is rolled and compacted, the indexes of CBR strength, shear strength, unconfined compressive strength and the like of the solidified sludge are 50-60% lost before rolling, so that the engineering application requirements cannot be met. Therefore, the one-time blending amount of the curing agent has to be increased in engineering to improve the strength of the cured sludge before crushing and rolling. However, the method not only increases the adding amount of the sludge curing material by times, but also increases the construction energy consumption of the subsequent high-strength curing sludge excavation and crushing, thereby greatly increasing the construction cost. Therefore, how to increase the strength of the roller compaction type solidified sludge as much as possible under the condition of minimum usage of the curing agent has very important engineering value.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a two-stage curing method and a two-stage curing system for reducing the strength loss of cured sludge, which can effectively reduce the strength loss of rolling type cured sludge and the construction energy consumption of excavation and crushing of the cured sludge, and reduce the consumption of curing agent, thereby greatly saving the construction cost.
In order to achieve the above object, the present invention provides the following solutions:
A two-stage curing process to reduce the strength loss of cured sludge, the process curing in two stages:
The first stage: pouring sludge excavated from a preset river and lake into a stirring tank, pouring a preset first amount of curing agent into the stirring tank filled with the sludge for full stirring, curing the sludge in a first stage, and stacking the cured sludge to a preset storage yard for smoldering and curing;
and a second stage: crushing the mud subjected to smoldering and health preserving, mixing a preset second amount of curing agent into the crushed mud, fully stirring, and conveying the stirred cured mud to a filling bin surface for rolling construction.
Preferably, the curing agent is formed by mixing cement, blast furnace slag and phosphorus lime.
Preferably, in the first stage, the mixing amount of the curing agent poured into the stirring tank is calculated according to the following formula:
Wherein:
a c1 is the mixing amount of the curing agent in the first stage, and the unit is kg/m 3;
q u1 is unconfined compressive strength of the first-stage solidified sludge which meets construction requirements after curing for 3 days, and the unit is kPa;
k 0 is the curing coefficient of curing the organic matter-free curing sludge for 3 days in the first stage, and the unit is kN.m/kg;
a cm is the minimum blending amount of the curing agent, and the unit is kg/m 3;
w is the initial water content of the sludge in units;
w 0 is the actual water content of the sludge before solidification, and the unit is that;
O c is the organic matter content of the sludge in units;
b is an attenuation coefficient of the curing coefficient k of the first-stage curing sludge along with the increase of the organic matter content of the sludge, and the attenuation coefficient is dimensionless;
The a cm and the k 0 are determined by an unconfined compressive strength test carried out after curing the silt with different curing agent doping amounts in the first stage for 3 days;
b is determined by an unconfined compressive strength test carried out after curing sludge with different curing agents and different organic matter contents for 3 days in the first stage, and the relationship between b and k is as follows:
Preferably, in the second stage, the mixing amount of the curing agent for curing the sludge after being stirred to be crushed is calculated according to the following formula:
Wherein:
a c2 is the mixing amount of the curing agent in the second stage, and the unit is kg/m 3;
q u2 is unconfined compressive strength per unit kPa before the first-stage solidified sludge is crushed;
alpha is the strength reduction coefficient of the solidified sludge after crushing and rolling in the first stage after the curing of the choke plug, and the value range is 0.3-0.5, and the unit is dimensionless;
q u3 is unconfined compressive strength of the second-stage solidified sludge meeting design requirements after rolling for 7 days, and the unit is kPa;
k 2 is the curing coefficient of curing for 7 days after the second sludge curing, and the unit is kN.m/kg;
q u2 is determined by an unconfined compressive strength test carried out on a sample before solidification, siltation and crushing in the first stage after curing of the choke material;
The k 2 is determined by an unconfined compressive strength test carried out after curing the solidified sludge in the second stage for 7 days under different mixing amounts of the solidifying agent.
The invention also provides a two-stage curing system for reducing the strength loss of the cured sludge, comprising: a first curing module and a second curing module;
the first curing module is used for pouring sludge excavated from a preset river and lake into the stirring tank, pouring a preset first amount of curing agent into the stirring tank filled with the sludge for full stirring, further curing the sludge in the first stage, and stacking the cured sludge to a preset storage yard for smoldering and curing;
The second curing module is used for crushing the mud subjected to the smoldering material health maintenance, doping a preset second amount of curing agent into the crushed mud, fully stirring, and conveying the stirred cured mud to a filling bin surface for rolling construction.
Preferably, the curing agent is formed by mixing cement, blast furnace slag and phosphorus lime.
Preferably, in the first curing module, the mixing amount of the curing agent poured into the stirring tank is calculated according to the following formula:
Wherein:
a c1 is the mixing amount of the curing agent in the first stage, and the unit is kg/m 3;
q u1 is unconfined compressive strength of the first-stage solidified sludge which meets construction requirements after curing for 3 days, and the unit is kPa;
k 0 is the curing coefficient of curing the organic matter-free curing sludge for 3 days in the first stage, and the unit is kN.m/kg;
a cm is the minimum blending amount of the curing agent, and the unit is kg/m 3;
w is the initial water content of the sludge in units;
w 0 is the actual water content of the sludge before solidification, and the unit is that;
O c is the organic matter content of the sludge in units;
b is an attenuation coefficient of the curing coefficient k of the first-stage curing sludge along with the increase of the organic matter content of the sludge, and the attenuation coefficient is dimensionless;
The a cm and the k 0 are determined by an unconfined compressive strength test carried out after curing the silt with different curing agent doping amounts in the first stage for 3 days;
b is determined by an unconfined compressive strength test carried out after curing sludge with different curing agents and different organic matter contents for 3 days in the first stage, and the relationship between b and k is as follows:
Preferably, in the second curing module, the mixing amount of the curing agent for curing the sludge after being stirred to be crushed is calculated according to the following formula:
Wherein:
a c2 is the mixing amount of the curing agent in the second stage, and the unit is kg/m 3;
q u2 is unconfined compressive strength per unit kPa before the first-stage solidified sludge is crushed;
alpha is the strength reduction coefficient of the solidified sludge after crushing and rolling in the first stage after the curing of the choke plug, and the value range is 0.3-0.5, and the unit is dimensionless;
q u3 is unconfined compressive strength of the second-stage solidified sludge meeting design requirements after rolling for 7 days, and the unit is kPa;
k 2 is the curing coefficient of curing for 7 days after the second sludge curing, and the unit is kN.m/kg;
q u2 is determined by an unconfined compressive strength test carried out on a sample before solidification, siltation and crushing in the first stage after curing of the choke material;
The k 2 is determined by an unconfined compressive strength test carried out after curing the solidified sludge in the second stage for 7 days under different mixing amounts of the solidifying agent.
Compared with the prior art, the invention has the beneficial effects that:
The two-stage curing method provided by the invention can effectively reduce the strength loss of the roller-compaction type curing sludge and the construction energy consumption of the excavation and crushing of the curing sludge, and reduce the consumption of the curing agent, thereby greatly saving the construction cost.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a curing method of the present invention;
FIG. 2 shows the results of an unconfined compressive strength test of the first stage cured sludge of the present invention after 3 days of curing;
FIG. 3 is a graph showing the relation between the curing coefficient k of the first-stage curing sludge and the organic matter content of the sludge;
FIG. 4 shows the results of an unconfined compressive strength test of the second stage cured sludge of the present invention after 7 days of curing.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1, the present invention provides a two-stage curing method for reducing the strength loss of the cured sludge, which cures in two stages:
The first stage: pouring sludge excavated from a preset river and lake into a stirring tank, pouring a preset first amount of curing agent into the stirring tank filled with the sludge for full stirring, curing the sludge in a first stage, and stacking the cured sludge to a preset storage yard for smoldering and curing;
and a second stage: crushing the mud subjected to smoldering and health preserving, mixing a preset second amount of curing agent into the crushed mud, fully stirring, and conveying the stirred cured mud to a filling bin surface for rolling construction.
In this embodiment, the curing agent is formed by mixing cement, blast furnace slag and phosphorus lime.
In this example, in the first stage, the amount of the curing agent added to the stirring tank was calculated according to the following formula:
Wherein:
a c1 is the mixing amount of the curing agent in the first stage, and the unit is kg/m 3;
q u1 is unconfined compressive strength of the first-stage solidified sludge which meets construction requirements after curing for 3 days, and the unit is kPa;
k 0 is the curing coefficient of curing the organic matter-free curing sludge for 3 days in the first stage, and the unit is kN.m/kg;
a cm is the minimum blending amount of the curing agent, and the unit is kg/m 3;
w is the initial water content of the sludge in units;
w 0 is the actual water content of the sludge before solidification, and the unit is that;
O c is the organic matter content of the sludge in units;
b is an attenuation coefficient of the curing coefficient k of the first-stage curing sludge along with the increase of the organic matter content of the sludge, and the attenuation coefficient is dimensionless;
The a cm and the k 0 are determined by an unconfined compressive strength test carried out after curing the silt with different curing agent doping amounts in the first stage for 3 days;
b is determined by an unconfined compressive strength test carried out after curing sludge with different curing agents and different organic matter contents for 3 days in the first stage, and the relationship between b and k is as follows:
Preferably, in the second stage, the mixing amount of the curing agent for curing the sludge after being stirred to be crushed is calculated according to the following formula:
Wherein:
a c2 is the mixing amount of the curing agent in the second stage, and the unit is kg/m 3;
q u2 is unconfined compressive strength per unit kPa before the first-stage solidified sludge is crushed;
alpha is the strength reduction coefficient of the solidified sludge after crushing and rolling in the first stage after the curing of the choke plug, and the value range is 0.3-0.5, and the unit is dimensionless;
q u3 is unconfined compressive strength of the second-stage solidified sludge meeting design requirements after rolling for 7 days, and the unit is kPa;
k 2 is the curing coefficient of curing for 7 days after the second sludge curing, and the unit is kN.m/kg;
q u2 is determined by an unconfined compressive strength test carried out on a sample before solidification, siltation and crushing in the first stage after curing of the choke material;
The k 2 is determined by an unconfined compressive strength test carried out after curing the solidified sludge in the second stage for 7 days under different mixing amounts of the solidifying agent.
Further, in the present embodiment, the two-stage curing method for reducing the strength loss of the roller compaction type cured sludge comprises the following steps:
a. The sludge excavated from the river and the lake is placed in a stirring tank, the initial water content w of the excavated sludge is 100%, and the organic matter content O c% is 5%;
b. the curing agent is formed by mixing cement, blast furnace slag and phosphorus lime, wherein the mass percentages of the components are 52%, 38% and 10% respectively;
c. Removing organic matters in the sludge by a burning method, and adding humic acid to prepare sludge with organic matters content of 0, 1%, 2%, 3%, 4% and 5% respectively;
d. Adding curing agents with the mixing amounts of 20kg/m 3、40kg/m3、60kg/m3、80kg/m3、100kg/m3 and 120kg/m 3 and sludge with different organic matter contents into a stirrer respectively, uniformly mixing, and curing the sludge in the first stage;
e. curing the cured sludge in the first stage, and detecting the non-lateral compressive strength of the cured sludge cured for 3 days by adopting a soil mechanical test method to obtain the non-lateral compressive strength of the cured sludge in the first stage under different curing agent doping amounts, wherein the non-lateral compressive strength is shown in figure 2;
f. The lowest amount of hardener a cm＝30kg/m3 was calculated according to fig. 2, and the cure coefficients for O c =0, 1%, 2%, 3%, 4% and 5% were calculated to be 28.0 (i.e. k 0 =28.0), 17.3, 10.3, 6.6, 4.1 and 2.5, respectively. The relation curve of the solidification coefficient k of the solidified sludge with the organic matter content of the sludge is drawn according to the relation curve, and is shown in figure 3. Calculating an attenuation coefficient b=48 of the curing coefficient increasing with the organic matter content according to fig. 3;
g. In the embodiment, the initial water content w=100% of the excavated sludge, the organic matter content is O c =5%, q u1 meeting the rolling requirement is 150kPa, a cm＝30kg/m3,k0 =28.0 and b=48 are known in the step f, if the actual water content w 0 of the sludge before solidification is equal to the initial water content, that is, w 0 =w=100%, the initial water content w is substituted into the formula (1) to calculate the mixing amount a c1＝89kg/m3 of the solidifying agent in the first stage; if the moisture content of the excavated sludge is reduced due to airing, for example, the moisture content w becomes 80%, substituting the excavated sludge into the formula (1) to calculate the mixing amount a c1＝66kg/m3 of the curing agent in the first stage of the sludge; if the water content of the excavated sludge is increased due to rainfall, for example, the water content w becomes 120%, substituting the excavated sludge into the formula (1) to calculate the mixing amount a c1＝118kg/m3 of the curing agent in the first stage of the sludge;
h. Curing agents with the mixing amounts of 10kg/m 3、20kg/m3、30kg/m3、40kg/m3、50kg/m3 and 60kg/m 3 are uniformly mixed with the crushed sludge, and the non-lateral compressive strength of the uniformly stirred cured sludge after 7 days of curing is tested by adopting a soil mechanics test method to obtain the non-lateral compressive strength of the second-stage cured sludge under different mixing amounts of the curing agents, as shown in figure 4. The cure coefficient k 2 =3 is calculated from fig. 4;
i. In the embodiment, the initial water content w=100% of the excavated sludge, the organic matter content is O c =5%, q u3 meeting the design requirement is 200kPa, alpha is 0.4, k 2 =3 is known in the step h, the formula (2) is substituted to calculate the mixing amount a c2＝33kg/m3 of the curing agent in the second stage, and the total amount a c1+ac2＝122kg/m3 of the curing agents mixed in two times.
For comparing the effect of the one-time doping and the two-stage doping of the curing agent, 122kg/m 3 of the total amount of the curing agent is doped into the sludge with the initial water content w=100% and the organic matter content O c =5%, and the strength of the sludge after 21 days of sultry and curing is 120kPa after curing, namely crushing and grinding and curing for 7 days, which is far less than 200kPa required by design. If 200kPa is reached, 195kg/m 3 of curing agent are added at a time. Therefore, the two-stage curing method provided by the invention can effectively reduce the consumption of the curing agent and save the construction cost.
Example two
The invention also provides a two-stage curing system for reducing the strength loss of the cured sludge, comprising: a first curing module and a second curing module;
the first curing module is used for pouring sludge excavated from a preset river and lake into the stirring tank, pouring a preset first amount of curing agent into the stirring tank filled with the sludge for full stirring, further curing the sludge in the first stage, and stacking the cured sludge to a preset storage yard for smoldering and curing;
The second curing module is used for crushing the mud subjected to the smoldering material health maintenance, doping a preset second amount of curing agent into the crushed mud, fully stirring, and conveying the stirred cured mud to a filling bin surface for rolling construction.
In this embodiment, the curing agent is formed by mixing cement, blast furnace slag and phosphorus lime.
In this embodiment, in the first curing module, the mixing amount of the curing agent poured into the stirring tank is calculated according to the following formula:
Wherein:
a c1 is the mixing amount of the curing agent in the first stage, and the unit is kg/m 3;
q u1 is unconfined compressive strength of the first-stage solidified sludge which meets construction requirements after curing for 3 days, and the unit is kPa;
k 0 is the curing coefficient of curing the organic matter-free curing sludge for 3 days in the first stage, and the unit is kN.m/kg;
a cm is the minimum blending amount of the curing agent, and the unit is kg/m 3;
w is the initial water content of the sludge in units;
w 0 is the actual water content of the sludge before solidification, and the unit is that;
O c is the organic matter content of the sludge in units;
b is an attenuation coefficient of the curing coefficient k of the first-stage curing sludge along with the increase of the organic matter content of the sludge, and the attenuation coefficient is dimensionless;
The a cm and the k 0 are determined by an unconfined compressive strength test carried out after curing the silt with different curing agent doping amounts in the first stage for 3 days;
b is determined by an unconfined compressive strength test carried out after curing sludge with different curing agents and different organic matter contents for 3 days in the first stage, and the relationship between b and k is as follows:
in this embodiment, in the second curing module, the mixing amount of the curing agent for curing the sludge after the crushing is calculated according to the following formula:
Wherein:
a c2 is the mixing amount of the curing agent in the second stage, and the unit is kg/m 3;
q u2 is unconfined compressive strength per unit kPa before the first-stage solidified sludge is crushed;
alpha is the strength reduction coefficient of the solidified sludge after crushing and rolling in the first stage after the curing of the choke plug, and the value range is 0.3-0.5, and the unit is dimensionless;
q u3 is unconfined compressive strength of the second-stage solidified sludge meeting design requirements after rolling for 7 days, and the unit is kPa;
k 2 is the curing coefficient of curing for 7 days after the second sludge curing, and the unit is kN.m/kg;
q u2 is determined by an unconfined compressive strength test carried out on a sample before solidification, siltation and crushing in the first stage after curing of the choke material;
The k 2 is determined by an unconfined compressive strength test carried out after curing the solidified sludge in the second stage for 7 days under different mixing amounts of the solidifying agent.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but various modifications and improvements made by those skilled in the art to which the present invention pertains are made without departing from the spirit of the present invention, and all modifications and improvements fall within the scope of the present invention as defined in the appended claims.
Claims (2)
1. A method of curing a two-stage curing system that reduces the loss of strength of a cured sludge, the system comprising: the method is characterized by comprising the steps of stacking the solidified sludge to a preset storage yard for smoldering and curing, crushing the smoldering and curing the sludge, mixing the solidified sludge after crushing with the solidified sludge after the preset second quantitative curing agent, and carrying out rolling construction on the stirred solidified sludge to a filling bin surface, and is characterized in that the method comprises the following steps of:
The first stage: pouring sludge excavated from a preset river and lake into a stirring tank, pouring a preset first amount of curing agent into the stirring tank filled with the sludge for full stirring, curing the sludge in a first stage, and stacking the cured sludge to a preset storage yard for smoldering and curing;
And a second stage: crushing the mud subjected to smoldering and health preserving, mixing a preset second amount of curing agent into the crushed mud, fully stirring, and conveying the stirred cured mud to a filling bin surface for rolling construction;
in the first stage, the mixing amount of the curing agent poured into the stirring tank is calculated according to the following formula:
（1）
Wherein:
a c1 is the mixing amount of the curing agent in the first stage, and the unit is kg/m 3;
q u1 is unconfined compressive strength of the first-stage solidified sludge which meets construction requirements after curing for 3 days, and the unit is kPa;
k 0 is the curing coefficient of curing the organic matter-free curing sludge for 3 days in the first stage, and the unit is kN.m/kg;
a cm is the minimum blending amount of the curing agent, and the unit is kg/m 3;
w is the initial water content of the sludge in units;
w 0 is the actual water content of the sludge before solidification, and the unit is that;
O c is the organic matter content of the sludge in units;
b is an attenuation coefficient of the curing coefficient k of the first-stage curing sludge along with the increase of the organic matter content of the sludge, and the attenuation coefficient is dimensionless;
The a cm and the k 0 are determined by an unconfined compressive strength test carried out after curing the silt with different curing agent doping amounts in the first stage for 3 days;
b is determined by an unconfined compressive strength test carried out after curing sludge with different curing agents and different organic matter contents for 3 days in the first stage, and the relationship between b and k is as follows: ；
in the second stage, the mixing amount of the curing agent for curing the sludge after being stirred to be crushed is calculated according to the following formula:
（2）
a c2 is the mixing amount of the curing agent in the second stage, and the unit is kg/m 3;
q u2 is unconfined compressive strength per unit kPa before the first-stage solidified sludge is crushed;
Alpha is the strength reduction coefficient of the solidified sludge after crushing and rolling in the first stage after curing the choke plug, and the value range is 0.3-0.5, and the unit is dimensionless;
q u3 is unconfined compressive strength of the second-stage solidified sludge meeting design requirements after rolling for 7 days, and the unit is kPa;
k 2 is the curing coefficient of curing for 7 days after the second sludge curing, and the unit is kN.m/kg;
q u2 is determined by an unconfined compressive strength test carried out on a sample before solidification, siltation and crushing in the first stage after curing of the choke material;
The k 2 is determined by an unconfined compressive strength test carried out after curing the solidified sludge in the second stage for 7 days under different mixing amounts of the solidifying agent.
2. The method for curing a two-stage curing system for reducing the strength loss of a cured sludge as defined in claim 1, wherein said curing agent is selected from the group consisting of cement, blast furnace slag and quicklime.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1843983A (en) * | 2006-04-27 | 2006-10-11 | 国家海洋局南海海洋工程勘察与环境研究院 | Curing processing method of ocean dredged mud |
| CN101579683A (en) * | 2009-05-27 | 2009-11-18 | 河海大学 | Phosphogypsum-sludge combined curing treatment method |
| CN106698872A (en) * | 2016-11-30 | 2017-05-24 | 中冶华天工程技术有限公司 | Fast sludge curing agent and method with slag as main raw material |
| CN108691301A (en) * | 2018-06-08 | 2018-10-23 | 堡森（上海）环境工程有限公司 | Ecological revetment based on dredged mud in-situ solidifying and preparation method |
| CN109736331A (en) * | 2018-12-24 | 2019-05-10 | 葛洲坝中固科技股份有限公司 | A kind of construction method for building landscape mountain using mud and agriculture and forestry organic waste material heap |
| CN110593036A (en) * | 2019-09-20 | 2019-12-20 | 上海市政工程设计研究总院（集团）有限公司 | Method for preparing roadbed filler by utilizing high-water-content engineering waste soil |
| CN111041916A (en) * | 2019-12-30 | 2020-04-21 | 中交水利水电建设有限公司 | Roadbed construction method by solidifying earthwork |
| CN112627154A (en) * | 2020-12-16 | 2021-04-09 | 浙大城市学院 | Water network zone lime solidified soil test section filling design method |
-
2023
- 2023-08-17 CN CN202311035847.9A patent/CN117003465B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1843983A (en) * | 2006-04-27 | 2006-10-11 | 国家海洋局南海海洋工程勘察与环境研究院 | Curing processing method of ocean dredged mud |
| CN101579683A (en) * | 2009-05-27 | 2009-11-18 | 河海大学 | Phosphogypsum-sludge combined curing treatment method |
| CN106698872A (en) * | 2016-11-30 | 2017-05-24 | 中冶华天工程技术有限公司 | Fast sludge curing agent and method with slag as main raw material |
| CN108691301A (en) * | 2018-06-08 | 2018-10-23 | 堡森（上海）环境工程有限公司 | Ecological revetment based on dredged mud in-situ solidifying and preparation method |
| CN109736331A (en) * | 2018-12-24 | 2019-05-10 | 葛洲坝中固科技股份有限公司 | A kind of construction method for building landscape mountain using mud and agriculture and forestry organic waste material heap |
| CN110593036A (en) * | 2019-09-20 | 2019-12-20 | 上海市政工程设计研究总院（集团）有限公司 | Method for preparing roadbed filler by utilizing high-water-content engineering waste soil |
| CN111041916A (en) * | 2019-12-30 | 2020-04-21 | 中交水利水电建设有限公司 | Roadbed construction method by solidifying earthwork |
| CN112627154A (en) * | 2020-12-16 | 2021-04-09 | 浙大城市学院 | Water network zone lime solidified soil test section filling design method |
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