CN102701561A - Quick drying method for sludge - Google Patents
Quick drying method for sludge Download PDFInfo
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- CN102701561A CN102701561A CN2012101828104A CN201210182810A CN102701561A CN 102701561 A CN102701561 A CN 102701561A CN 2012101828104 A CN2012101828104 A CN 2012101828104A CN 201210182810 A CN201210182810 A CN 201210182810A CN 102701561 A CN102701561 A CN 102701561A
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Abstract
The invention relates to a quick drying method for sludge. The method comprises the following steps of: firstly, previously embedding a water discharging plate, a condenser pipe and a temperature sensor in a storage yard; inputting sludge into the storage yard, and preliminarily concentrating to fill the storage yard; and vacuumizing, and when the vacuumization is carried out again till the water yield is obviously reduced after 'freezing-unfreezing', stopping to check and accept. According to the method, the soil body can be quickly converted into the plastic state or the semi-solid state from the flowing state; and compared with the existing quick drying method, the quick drying method can greatly shorten the work period and save the construction cost.
Description
Technical field
The present invention relates to a kind of mud drying method for treating, especially a kind of fast dewatering drying method that promotes Zhong He lake, stockyard dredging silt belongs to mud drying and other treatment field.
Background technology
River and lake silt is the mixture of clay, silt, organic matter and various mineral normally, is deposited on water bottom through effect such as long-time physics, chemistry and biology and water body transmission and forms.
China is vast in territory; The lake, river is numerous, is in the urbanization high speed development stage again, a large amount of mud waste of annual generation; Only Taihu Lake, Jiangsu has 69.83% area to be covered by the above mud of 0.1 meter thickness according to investigations; The thickness reaches more than the 5m, and the total accumulation of mud is 19.12 billion cubic meters, and mean depth is 1.24 meters.
The harm that rolls up main generation two aspects of mud, the one, stop up the river course, cause the network of rivers not smooth, the water surface disappears, and reduces the flood control flood carrying capacity; The 2nd, cause the endogenous in He Hai lake to pollute, discharge pollutent for a long time to water body, blue-green algae is broken out, the aquatic animals and plants mass mortality loses water body to drink, breed and landscape value.For solving this two problems, the dredging desilting of lake, river is imperative.
Mud subsequent disposal after the desilting is a key issue because dredging silt not only generation is big, and mechanical property is poor, water ratio is high, is fluid state, handles the untimely desilting process that not only influences, and also can cause secondary pollution.As if practice shows, reaches 3 years even the mud that directly goes out is clearly stacked, and the surface is dry, but innerly still contain a large amount of water, do not have bearing capacity, in the mud transportation ooze out and secondary pollution that rain drop erosion causes very serious.According to incompletely statistics, the only annual depleted dredging silt of China just reaches more than 1 billion cubic meter, and the depleted dredging silt often places land to throw and fills out district or low-lying area, has taken some fish ponds and cultivated land, has produced very high land expropriation cost.The funds of China's south water to north east line first phase land acquisition just account for about 60% of engineering total expenses.
This shows that the mud after the dredging the most important thing is drying and other treatment.Because the restriction of land area goes out mud clearly and generally deposits in the stockyard, also is to carry out drying and other treatment in the mummifying pool.Mud after the drying and other treatment must be able to satisfy does not make when machinery is gone into the pond and excavated that machinery sink, the not requirement of water clock during transportation, is beneficial to the second stage employ of mud.Therefore, the mud mud containing rate after the processing need be higher than the plastic limit mud containing rate, and as far as general mud, the mud containing rate when reaching plastic limit (ratio that refers to dried shale amount and mud total mass, down with) is 67 ~ 68%.Requirement to the mud bearing capacity is: calculate with crawler-mounted excavator weight, the mud bearing capacity must not be lower than 8t/m
2
The method of the dredging silt drying and other treatment that proposes at present is also more, use more widely as: 1. vacuum method.This method is easy and simple to handle, and cost is lower, technology maturation, and application surface is wider.Wherein vacuum pre-pressed joint accumulation load method, vacuum pre-pressed joint supercharge method (seeing CN 200820160080.7) also are the improvement on the basis of this method.The shortcoming of this method is that the duration is longer, generally needs 4-5 month vacuum, and when the mud mud containing rate reaches 65% left and right sides, extremely difficult lifting.2. solidification method.This method is in mud, to add solidifying agent (like cement, lime, proteolytic enzyme etc.) to make sludge solidification.The advantage of this method is that the duration is short, instant effect, and shortcoming is that cost is high, it is little to handle amount of sludge, has changed the character of mud as soil after the more important thing is processing, is difficult to second stage employ, with environmental protection concept is incompatible with now.3. heavy-tamping method.This method is common in mud property treatment of soft foundation, need lay sand bedding course during processing, and is relatively poor to the dredging silt treatment effect.4. filter bag method.This method is that mud is packed in the special filter bag, makes wherein that moisture content oozes out, thereby reaches the purpose of mummification.The shortcoming of this method is that treatment capacity is less, and is long in time limit, does mud very big to the above difficulty of plastic limit.Also have heating method, mechanical centrifuging, filter press technique, electroosmotic drainage etc. in addition, all have problems such as energy consumption is big, treatment capacity is little, dehydration is not thorough, do not have large-scale application.
Freezing concretion method is a kind of provisional soil solidifying method that is usually used in geotechnical engineering.In mud, press the power of water and mud particle bonding force, be divided into four kinds of water: strong planar water, promptly with mud particle electrostatic double layer bonded water; Weak planar water, promptly with electrostatic double layer in the water of diffusion layer absorption; Capillary water promptly is present in the water in the pore between the mud particle; Free water comprises gravity free water and backlash freedom water.In mummification mode commonly used at present---in the vacuum preloading construction process; Free water can be through vacuumizing removal; Other moisture content then is difficult to through vacuumizing removal, vacuum preloading mummification to the soil body mud containing rate extremely difficult reason that further improves that reaches at 65% o'clock why that Here it is.And with the soil body through someway freezing fixed after, the water that a part of difficulty in the soil body removes will build-up ice like capillary water and weak planar water, behind thaw, just changes free water into, vacuumizes will be easy to remove again, thereby improves soil body mud containing rate.In addition, the mud form after " freezing-thaw " handles can become the small-particle sheet, has changed the compact shape that the soil body appears behind the general vacuum preloading.And after ice crystal changes the water extraction into, can in soil, form hole, make water more be prone in the soil body, flow, thereby also increased the pump drainage water effect of vacuum preloading.
CN 101881024A discloses a kind of freeze thawing concretion method of silt soft base.This method also is that vacuum preloading and soil body freeze thawing are united use; With discharging consolidation sludge soft ground, reached effect preferably, but also there is following problem in this method: (1) is in the process of freezing; With free water also glaciation, strengthened the loss of energy.Because free water content is maximum in the mud, also the easiest discharge.Free water after freeze thawing still is a free water, so this portion water needn't be freezed empty energy consumption.(2) its prolong is a rear loading type, and is to insert drain board earlier, and prolong is inserted in the back, causes prolong can't in the soil body, form the loop line, and energy spreads in the soil body slowly, has prolonged freeze-off time.(3) need to lay chaste tree basketry, mountain skin soil padding and sand bedding course etc., increased engineering cost at muck surface.(4) along with the mummification of the soil body is sunk, the soil body has air leaks unavoidably, and the efficient of drawing water of drain board is reduced.(5) after the soil body freezes, utilize the gentle face of land, ground heat dissipating layer to melt, cause and melt slowly, prolonged the duration greatly.(6) need a segment length to reach 4-6 month sedimentation and drawing time before the construction, this also makes the duration that suitable prolongation is arranged.
Summary of the invention
The present invention is directed to the deficiency of prior art, provide a kind of draining fast, efficient, thoroughly and the quick drying method of dredging silt of less energy-consumption.
For reaching this purpose, the present invention adopts following technical scheme:
The quick drying method of a kind of mud may further comprise the steps:
1) pre-buried drain board in the stockyard, and drain board is connected with vacuum pipe, the pipe network system that vacuumizes formed;
2) pre-buried prolong in the stockyard makes prolong form the loop line, and between adjacent prolong, buries temperature inductor underground;
3) mud is imported the stockyard, discharging face source, flocculation back water carries out tentatively concentrated to mud;
4) repeating step 3) fill with to the stockyard;
5) lay geotextile and sealing membrane at the mud face;
6) vacuumize, treat that mud containing rate reaches about 60%, or continuous 4 days of mud face sinkability stops to vacuumize during less than 2mm;
7), and in prolong, circulate with the refrigeration of the condensing agent in the prolong; When the mud bulk temperature reaches-4 ℃, stop refrigeration;
8) in prolong, change logical hot water, mud is thawed; When treating that the mud bulk temperature reaches more than 4 ℃, stop logical hot water, begin to vacuumize;
9) it is obviously less to be evacuated to aquifer yield, or continuous 4 days of mud face sinkability is stopped work and checked and accepted during less than 1mm.
The extraction water that step 6) of the present invention vacuumizes can be used as burden pressure and is pressed on the sealing membrane.Step 6) described " mud containing rate reaches about 60% " can realize in actually operating those skilled in the art can know how to be evacuated to mud containing rate about 60% to obtain corresponding effect.In actually operating, stop behind operator's vacuum-pumping to the mud containing rate 45 ~ 70%, for example 46%, 52%, 58%, 63%, 68% etc., all can be used for embodiment of the present invention.
The aperture of the said drain board of step 1) of the present invention is 80 ~ 100 μ m, 80.5 ~ 98 μ m for example, 83 ~ 95 μ m, 89 ~ 92 μ m etc., further preferred 90 μ m.The big I in aperture is selected according to practical situation and experience by those skilled in the art.
Step 2 of the present invention) said prolong material is a copper tube, and its cross section is 16 ~ 28mm * 1.5 ~ 3.0mm, preferred 24 ~ 28mm * 1.5 ~ 2.0mm.For example can select 24mm * 2.0mm, 28mm * 2.0mm, 16mm * 1.5mm etc.
Further, be 1.0 ~ 1.2m with a layer prolong spacing, 1.02 ~ 1.19m for example, 1.06 ~ 1.15m, 1.09 ~ 1.12m etc.
Further, the spacing of adjacent two layers prolong is 0.8 ~ 1.0m, 0.81 ~ 0.99m for example, 0.85 ~ 0.94m, 0.9m etc.Those skilled in the art can confirm the number of plies of prolong according to actual scale.
Further, condensation section length is 1.5 ~ 15m, 1.6 ~ 14.8m for example, 4 ~ 12m, 8 ~ 10m etc., further preferred 10 ~ 14m, most preferably 12m.
Further, prolong is fixed in the stockyard through the mode of suspension.
Hang is following: two ends and middle part at every prolong are a steel wire cord, and the steel wire cord is connected on the framework on top, stockyard, and said framework inserts the stockyard wall with fixing, and the distance of itself and stockyard opening part is about 1/3 of the stockyard degree of depth.Described " be about the stockyard degree of depth 1/3 " can realize in actually operating that those skilled in the art can be about 1/3 of the stockyard degree of depth in the distance with the stockyard opening part, as in 1/4 ~ 1/2 scope framework being set, all can realize the object of the invention.Connect with plastic hose between adjacent two prolongs, form the loop line, be connected with unit cooler again.
Said condensing agent is CaCl
2Solution.Preferably, the proportion of condensing agent is 1.25 ~ 1.28, further preferred 1.26.
Temperature when further, condensing agent gets into the stockyard is-30 ~-32 ℃.
The flocculation agent that the said flocculation of step 3) of the present invention is used is polymeric flocculant, and addition is 50 ~ 60ppm, 50.5 ~ 58ppm for example, 53 ~ 56ppm, 55ppm etc., further preferred 56ppm.
Further, coagulant aids is the Poly aluminum Chloride (PAC) coagulant aids, and addition is 80 ~ 100ppm, 80.2 ~ 98ppm for example, 86 ~ 93ppm, 90ppm etc., further preferred 85ppm.
The medicament commonly used that flocculation agent of the present invention and coagulant aids can adopt those skilled in the art to know.Wherein, flocculation agent adopts preferably that disclosed hydrophobic cation polymeric flocculant its preparation method comprises following steps among the CN 101618937A:
A, take by weighing mol ratio for (89.5 ~ 56.5): (10 ~ 40): the acrylic amide of (0.5 ~ 3.5), methylacryoyloxyethyl trimethyl ammonium chloride and octadecyl vinyl ether are subsequent use, and said two kinds of material total amounts are counted the total monomer amount;
B, acrylic amide and methylacryoyloxyethyl trimethyl ammonium chloride that step a is taken by weighing add in the reaction vessel; Add the cats product that accounts for the urea of total monomer amount 0.5 ~ 2wt% and account for total monomer amount 6 ~ 7wt% again; Add deionized water and stirring at last; Make the mixture dissolving in the reaction vessel, the add-on of deionized water and total monomer amount weight ratio are (70 ~ 80): (20 ~ 30);
C, the mixing solutions of step b is warming up to 30 ~ 35 ℃, in reaction vessel, adds again and account for the octadecyl vinyl ether of total monomer amount 0.5 ~ 3.5mo1% and stir;
D, in the reaction vessel of step c, add the initiator of the 0.2 ~ 0.5wt% account for the total monomer amount, insulation is carried out polyreaction to 30 ~ 35 ℃, obtains translucent or milky gluey product behind 3 ~ 6h;
E, product are poured in the acetone, make its deposition, behind the taking-up throw out throw out are used ethanol extracting 24h again, promptly obtain hydrophobic cation polymeric flocculant.
The adding mode of said flocculation agent and coagulant aids be add in the stockyard or mud conveying pipeline in add stage by stage.The mud amount hour need not annotated mud through pipeline, but in container, add, and this mode does not influence the action effect of flocculation agent.But in big mummifying pool, must could guarantee flocculation agent and coagulant aids and mud thorough mixing through the mode that pipeline adds stage by stage.In pipeline, add fashionable stage by stage; Preferred adopt that disclosed instrument carries out among the CN201737824U, concentration, flow and delivery turbidity that can on-line automatic measurement feed mud, according to the feedback signal of concentration, flow through computer settings procedure auto-control medicament add-on; Through the feedback signal of water turbidity the medicament add-on is in time revised simultaneously; Improve the accuracy of medicament add-on greatly, and guarantee the delivery turbidity qualified discharge, make whole apparatus system, coordinated operation.
Mud after handling in three months, and mud containing rate is not less than 75%, and bearing capacity is not less than 10t/m
2
The quick drying method of a kind of mud may further comprise the steps:
1) pre-buried drain board in the stockyard, and with drain board and vacuum manifold, be responsible for and be connected, composition vacuumizes the pipe network system;
2) the pre-buried prolong of layering in the stockyard makes every layer of prolong form the loop line, and between adjacent prolong, buries temperature inductor underground;
3) mud is imported the stockyard through pipeline, in the process of pipeline of flowing through, add flocculation agent and coagulant aids stage by stage, make mud rapid precipitation after flowing into the stockyard, discharge face source water then, mud is carried out tentatively concentrated;
4) repeating step 3) three times, the stockyard is filled with;
5) lay one to two-layer geotextile at the mud face, on geotextile, repave one to two-layer sealing membrane;
6) vacuum is responsible for connection vacuum unit, vacuumizes, extraction water can be used as burden pressure and is pressed on the sealing membrane;
7) treat that water outlet obviously reduces, mud containing rate reaches about 60% in the stockyard, or continuous 4 days of mud face sinkability stops to vacuumize during less than 2mm;
8) prolong is connected unit cooler, give the refrigeration of the condensing agent in the prolong, and condensing agent is circulated in prolong;
9) when the mud bulk temperature reaches-4 ℃, stop refrigeration;
10) in prolong, change logical hot water, mud is thawed;
When 11) treating that the mud bulk temperature reaches more than 4 ℃, stop logical hot water, begin to vacuumize;
12) it is obviously less to be evacuated to aquifer yield, or continuous 4 days of mud face sinkability is stopped work and checked and accepted during less than 1mm.
Compare with the prior art scheme, the present invention has following beneficial effect:
Flocculation agent can make mud rapid flocculation deposition concentrate, and vacuumizes the free water that can make in the soil body and extracts out fast, and the freezing weak planar water, the capillary water that are difficult in the soil body extract out of making changes free water into, can discharge fast with the mode that vacuumizes again.In addition, after " freeze-thaw ", also can make the soil body form particulate state, drainage channel increases, and has promoted moisture content to flow.And after ice crystal changes the water extraction into, can in soil, form hole, also accelerated the discharge of moisture content.The present invention can make the soil body change plastic stage even semi-solid state into from flow state fast, compares existing mud drying method for treating, has shortened the duration greatly, has saved executive cost.
1, drainage efficiency is high.The present invention changes capillary water that is difficult to extract out in the vacuum preloading process and weak planar water into be prone to extraction free water, has improved mud mummification effect.
2, energy-conservation.With mud freezing be one relatively the power consumption process.The present invention carries out freezingly after most free water are extracted out, makes vacuum preloading and freezing mummification perfect adaptation, has reduced the consumption of energy.
3, freezing efficiency is high.The present invention makes prolong and unit cooler form the loop line through pre-buried prolong, has improved the utilising efficiency of energy, has accelerated refrigerating speed.
4, shortened the duration.Through adding flocculation agent and coagulant aids early stage, saved the time of deposition mud; Through in prolong, adding circulating hot water, a pipe is dual-purpose, has shortened thawing time, thereby has shortened the duration greatly.
Down in the face of further explain of the present invention.But following instance only is a simple and easy example of the present invention, does not represent or limits rights protection scope of the present invention, and interest field of the present invention is as the criterion with claims.
Embodiment
For the present invention is described better, be convenient to understand technical scheme of the present invention, typical case of the present invention but non-restrictive example is following:
Mud containing rate according to the invention is dried shale amount and the ratio of mud total mass.
Embodiment one: the quick drying method of a kind of mud, take following steps:
(1) pre-buried drain board.The mud container is the iron case of 1m (length) * 1m (wide) * 1m (height).In the middle of the iron case, put into one long 1.2 drain board, its aperture is 100 μ m.For preventing that it is floating or change the position that fixing its upper and lower ends notices that the upper end needs to reserve 0.6m.
(2) pre-buried prolong.Place a U-shaped copper tube in iron case mid-way, the copper tube specification is 16mm * 1.5mm, and length overall is 1.5m, bends to be U-shaped.
(3) pre-buried temperature inductor.In the iron case, put into 3 temperature inductors, make it uniform distribution.
(4) inject mud.In the iron case, inject dredging mud, until filling with whole iron case.
(5) in the iron case, add 50ppm flocculation agent and 80ppm Poly aluminum Chloride (PAC) coagulant aids.
(6) discharging face source water.After adding flocculation agent and coagulant aids, mud can flocculate in 1 minute, mud solids precipitation, discharging supernatant.
(7) repeating step (4)-(6) is three times, accomplishes slip casting.
(8) lay one deck geotextile on the mud surface.
(9) on geotextile, lay one deck sealing membrane.The sealing membrane area is about 2.5m
2, four edge iron chamber interior walls are imbedded in the mud.
(10) pass geotextile, sealing membrane picks out prolong, drain board, temperature inductor circuit, the tight cut place of colligation sealing membrane and geotextile.
(11) drain board is connected the vacuum unit, vacuumize, keep vacuum tightness and be not less than 0.08MPa, vacuum tightness is leaked vacuum if be lower than this value explanation, needs inspection reparation.
(12) be evacuated to aquifer yield and obviously reduce, when mud containing rate reaches 60% left and right sides, stop to vacuumize.
(13) prolong is connected unit cooler, in prolong, feed condensing agent, condensing agent is circulated between prolong and unit cooler, to absorb the heat in the soil body.
Said condensing agent is CaCl
2Solution, proportion are 1.25, the Calcium Chloride Powder Anhydrous preparation with 96%.The condensing agent temperature is-30 ℃.
(14) monitoring soil body temperature when treating that soil body medial temperature reaches-4 ℃, stops refrigeration.
(15) in this prolong, feed hot water, make native intravital ice-out to thaw.The hot water temperature is 90 ℃.Hot water is at the prolong internal recycle, to make full use of the heat that wherein contains.When treating that soil body bulk temperature reaches more than 4 ℃, stop logical hot water.
(16) start vacuum pump, continue to vacuumize, separate out water after thawing with extraction.
When (17) treating that aquifer yield obviously reduces, stop work and check and accept, detect mud containing rate.
Control group also is set in the present embodiment, control group except that do not add prolong, do not carry out freezing, all the other all operations steps are same as described above.
Implement to finish the back and detect two groups of ensemble average mud containing rates, the gained result is as shown in table 1.
Table 1 the inventive method and control group compare the mummification effect of mud
Can know under the identical working hour, than control group remarkable lifting is arranged by table 1, handle back mud mud containing rate and be higher than plastic limit with the inventive method gained mud mud containing rate.Control group is after handling 528 hours, and mud containing rate does not still reach plastic limit.What control group was used is conventional vacuum preloading method.But being compared with ordinary method by comparison knowledge capital inventive method has bigger meliority, is the method for a kind of effective promotion mud mummification.
Embodiment two: the quick drying method of a kind of mud, take following steps:
(1) experiment container forms for the freight container transformation, and interior dimensions is 5.7m (length) * 2.1m (wide) * 2.2m (height).
(2) pre-buried drain board.Spacing with 70 * 70cm is laid drain board, in freight container, lays two rows altogether.Drain board is triangularly arranged, every long 2.5m, and the aperture is 80 μ m.For preventing that it is floating or change the position, container base is fixed in its lower end, the upper end is fixed in from container top 0.4m place, and 0.7m is reserved in the upper end.
(3) vacuum manifold, the person in charge are installed.It is the hard plastic tube of 70mm that arm, the person in charge all adopt diameter.Through a joint and a pipe coupling, all arms are connected with the person in charge, form pipe network system with drain board.
(4) pre-buried prolong.A copper tube is placed at the 0.5m place at the bottom of the case in container type, and copper tube takes the shape of the letter U, and specification is 24mm * 2.0mm, and length overall is 12m, bends to be U-shaped.
(5) pre-buried temperature inductor.In the iron case, put into 5 temperature inductors, make it uniform distribution.
(6) inject mud.In the iron case, inject mud, until filling with whole iron case.
(7) in the iron case, add 60ppm flocculation agent and 100ppm Poly aluminum Chloride (PAC) coagulant aids.
(8) discharging face source water.After adding flocculation agent and coagulant aids, mud can flocculate in several minutes, mud solids precipitation, discharging supernatant.
(9) repeating step (6)-(8) is three times, accomplishes slip casting.
(10) lay one deck geotextile on the mud surface.
(11) on geotextile, lay one deck sealing membrane.The sealing membrane area is about 30m
2, four edge inner wall of container are imbedded in the mud.
(12) pass geotextile, sealing membrane and pick out that prolong, drain board are responsible for, temperature inductor circuit, closely the cut place of colligation sealing membrane and geotextile.
(13) drain board is responsible for connection vacuum unit, vacuumizes, keep vacuum tightness and be not less than 0.08MPa, vacuum tightness is leaked vacuum if be lower than this value explanation, needs to check and repairs.
(14) be evacuated to aquifer yield and obviously reduce, when mud containing rate reaches 60% left and right sides, stop to vacuumize.
(15) prolong is connected unit cooler, in prolong, feed condensing agent, condensing agent is circulated between prolong and unit cooler, to absorb the heat in the soil body.
Said condensing agent is CaCl
2Solution, proportion are 1.28, the Calcium Chloride Powder Anhydrous preparation with 96%.The condensing agent temperature is-32 ℃.
(16) monitoring soil body temperature when treating that soil body medial temperature reaches-4 ℃, stops refrigeration.
(17) in this prolong, feed hot water, make ice-out in the soil body to thaw.The hot water temperature is 90 ℃.Hot water is at the prolong internal recycle, to make full use of the heat that wherein contains.When treating that soil body bulk temperature reaches more than 4 ℃, stop logical hot water.
(18) start vacuum pump, continue to vacuumize, separate out water after thawing with extraction.
When (19) treating that aquifer yield obviously reduces, stop work and check and accept, detect mud containing rate.
Control group also is set in the present embodiment, control group except that do not add prolong, do not carry out freezing, all the other all operations steps are same as described above.
Implement to finish the back and detect two groups of ensemble average mud containing rates, the gained result is as shown in table 1.
The inventive method and control group be to the mummification effect of mud relatively in freight container for table 2
Can be known under the identical working hour, than control group remarkable lifting is arranged with the inventive method gained mud mud containing rate by table 2, mud containing rate improves more than 10%, handles back mud mud containing rate and is higher than plastic limit.Control group is after handling 75 days, and mud containing rate does not still reach plastic limit.What control group was used is conventional vacuum preloading method.By the visible more conventional vacuum preloading method of the inventive method of table 2 bigger meliority being arranged, is the method for a kind of effective promotion mud mummification.
Embodiment three: a kind of method that promotes the quick mummification of dredging silt in the stockyard, take following steps:
(1) the mud stockyard is a mummifying pool, and interior dimensions is 15m (length) * 15m (wide) * 4m (deeply), and volume is 900m
3Below ground excavation 2.5m, high 1.5m is piled in the cofferdam.The 2 layers of sealing membrane in the inner shop of mummifying pool are done antiseepage and are handled.
(2) pre-buried drain board.Spacing with 80 * 80cm is laid drain board, and drain board is triangularly arranged, every long 4.5m, and the aperture is 90 μ m.For preventing that it is floating or change the position that the mummifying pool bottom is fixed in its lower end, and the upper end is fixed in from mummifying pool surface opening 1m place, notices that the upper end needs to reserve 1.5m.
(3) vacuum manifold, the person in charge are installed.It is the hard plastic tube of 70mm that arm, the person in charge all adopt diameter.Through a joint and a pipe coupling, all arms are connected with the person in charge, form pipe network system with drain board.
(4) pre-buried prolong.As prolong, specification is 28mm * 2.0mm, long 14m with copper tube.Copper tube is laid by layer in mummifying pool, and the first layer is 0.8m from the mummifying pool bottom, is made up of 14 parallel copper tubes, and two parallel pipe spacings are 1.0m, connect with plastic hose between adjacent two prolongs, form a passage.Every copper tube keeps the distance bottom mummifying pool with the mode with the seizing wire suspension.Every copper tube is a seizing wire at two ends and mid-way respectively, and another of wireline section ties up on the framework on top, and framework is 2.5m from the mummifying pool bottom, through inserting the mummifying pool wall with the fixed position.Mode with the seizing wire suspension not only helps the fixedly position of copper tube, and helps the mud drying and other treatment to finish extracting of back copper tube, with recycling.
Second layer copper tube is positioned at the first layer top, apart from the first layer 1.0m, and its laying, the same the first layer of fixed form.Every layer of copper tube has a circulation loop of one's own, is beneficial to condensing agent and in pipeline, circulates.In the process of injecting mud, floating for preventing copper tube, fills with water in needing to manage.
(5) pre-buried temperature inductor.In mummifying pool, put into 9 temperature inductors, make it uniform distribution.
(6) inject mud.When dredging mud is flowed through pipeline, add flocculation agent and coagulant aids stage by stage.First instrument adds a kind of polymeric flocculant, and second instrument adds the coagulant aids Poly aluminum Chloride (PAC).The flocculation agent addition is 56ppm, and the coagulant aids addition is 85ppm.
(7) discharging face source water.After adding flocculation agent and coagulant aids, mud can flocculate at short notice, mud solids precipitation, discharging supernatant.
(8) repeating step (6)-(7) is three times, accomplishes slip casting.
(9) lay the sealing ditch.The excavation of sealing ditch should be along the border of mummifying pool, and the degree of depth is 1m, and backfill soil is a pure clay, and tamping in layers during backfill avoids filler directly to clash into sealing membrane.
(10) lay one deck geotextile on the mud surface.
(11) on geotextile, lay two-layer sealing membrane.Every layer of sealing membrane area is about 350m
2, four length of sides go out mummifying pool and partly imbed the sealing ditch.
(12) pick out prolong, the drain board person in charge, temperature inductor circuit, whether the inspection sealing membrane has hole, if then in time sticking benefit is arranged.
(13) drain board is responsible for connection vacuum unit, vacuumizes, keep vacuum tightness and be not less than 0.08MPa, vacuum tightness is leaked vacuum if be lower than this value explanation, needs to check and repairs.To extract water out is pressed on the sealing membrane as burden pressure.
(14) be evacuated to aquifer yield and obviously reduce, stop to vacuumize.
(15) prolong is connected unit cooler, in prolong, feed condensing agent, condensing agent is circulated between prolong and unit cooler, to absorb the heat in the soil body.Upper and lower two-layer prolong respectively connects a unit cooler.
Said condensing agent is CaCl
2Solution, proportion are 1.26, the Calcium Chloride Powder Anhydrous preparation with 96%.The condensing agent temperature is-30 ℃.
(16) monitoring soil body temperature when treating that soil body medial temperature reaches-4 ℃, stops refrigeration.
(17) in this prolong, feed hot water, make ice-out in the soil body to thaw.The hot water temperature is 92 ℃.Hot water is at the prolong internal recycle, to make full use of the heat that wherein contains.When treating that soil body bulk temperature reaches more than 4 ℃, stop logical hot water.
(18) start vacuum pump, continue to vacuumize, separate out water after thawing with extraction.
When (19) treating that aquifer yield obviously reduces, stop work and check and accept.
(20) in the soil body, extract copper tube, clean, check, in order to using next time.
Construction finishes the back and detects soil body ensemble average mud containing rate and bearing capacity, and the gained result is as shown in table 3.
Table 3 the inventive method is to the mummification effect of mud in the stockyard
Can be known that by table 3 after 86 days by a definite date processing, the average mud containing rate of mud is 75.2% in the stockyard, is higher than the plastic limit mud containing rate, bearing capacity reaches 11.6t/m
2, can bear general crawler-mounted excavator walking, excavation.
In the stockyard, the principal element that influences mud mummification effect is the mud degree of depth.The general mud stockyard degree of depth is 3 ~ 4m, and the dark 4m in present embodiment stockyard, volume are 900m
3, obtained good mummification effect.If storage space is extended to several thousand even 10,000 square metres, construction principle, technology and step are identical, still can reach this effect.This shows, handle the dredging silt in the stockyard with the inventive method, can reach the design and construction requirement fully, the mud after the processing can reach plastic state, can carry the common mechanical walking, excavate, and the whole duration was less than three months.Compare existing mud drying method, bigger meliority is arranged, therefore have great application and popularization value.
Applicant's statement, the present invention explains quick mummification step of the present invention through the foregoing description, but the present invention is not limited to above-mentioned quick mummification step, does not mean that promptly the present invention must rely on above-mentioned quick mummification step and could implement.The person of ordinary skill in the field should understand, and to any improvement of the present invention, to the interpolation of the equivalence replacement of raw material that the present invention selects for use and ancillary component, the selection of concrete mode etc., all drops within protection scope of the present invention and the open scope.
Claims (10)
1. quick drying method of mud may further comprise the steps:
1) pre-buried drain board in the stockyard, and drain board is connected with vacuum pipe, the pipe network system that vacuumizes formed;
2) pre-buried prolong in the stockyard makes prolong form the loop line, and between adjacent prolong, buries temperature inductor underground;
3) mud is imported the stockyard, discharging face source, flocculation back water carries out tentatively concentrated to mud;
4) repeating step 3) fill with to the stockyard;
5) lay geotextile and sealing membrane at the mud face;
6) vacuumize, treat that mud containing rate reaches about 60%, or continuous 4 days of mud face sinkability stops to vacuumize during less than 2mm;
7), and in prolong, circulate with the refrigeration of the condensing agent in the prolong; When the mud bulk temperature reaches-4 ℃, stop refrigeration;
8) in prolong, change logical hot water, mud is thawed; When treating that the mud bulk temperature reaches more than 4 ℃, stop logical hot water, begin to vacuumize;
9) it is obviously less to be evacuated to aquifer yield, or continuous 4 days of mud face sinkability is stopped work and checked and accepted during less than 1mm.
2. the method for claim 1 is characterized in that, the extraction water that step 6) vacuumizes can be used as burden pressure and is pressed on the sealing membrane.
3. according to claim 1 or claim 2 method is characterized in that the aperture of the said drain board of step 1) is 80 ~ 100 μ m, further preferred 90 μ m.
4. like the described method of one of claim 1-3, it is characterized in that step 2) said prolong material is copper tube, its cross section is 16 ~ 28mm * 1.5 ~ 3.0mm, preferred 24 ~ 28mm * 1.5 ~ 2.0mm;
Preferably, be 1.0 ~ 1.2m with layer prolong spacing;
Preferably, the spacing of adjacent two layers prolong is 0.8 ~ 1.0m;
Preferably, condensation section length is 1.5 ~ 15m, further preferred 10 ~ 14m, most preferably 12m;
Preferably, prolong is fixed in the stockyard through the mode of suspension.
5. like the described method of one of claim 1-4; It is characterized in that; Two ends and middle part at every prolong are a steel wire cord; The steel wire cord is connected on the framework on top, stockyard, and said framework inserts the stockyard wall with fixing, and the distance of itself and stockyard opening part is about 1/3 of the stockyard degree of depth;
Preferably, connect with plastic hose between adjacent two prolongs, form the loop line, be connected with unit cooler again.
6. like the described method of one of claim 1-5, it is characterized in that said condensing agent is CaCl
2Solution;
Preferably, the proportion of condensing agent is 1.25 ~ 1.28, further preferred 1.26;
Temperature when preferably, condensing agent gets into the stockyard is-32 ~-30 ℃.
7. like the described method of one of claim 1-6, it is characterized in that the flocculation agent that the said flocculation of step 3) is used is polymeric flocculant, addition is 50 ~ 60ppm, further preferred 56ppm;
Preferably, coagulant aids is a Poly aluminum Chloride (PAC), and the coagulant aids addition is 80 ~ 100ppm, further preferred 85ppm.
8. method as claimed in claim 7 is characterized in that, the adding mode of said flocculation agent and coagulant aids be add in the stockyard or mud conveying pipeline in add stage by stage.
9. like the described method of one of claim 1-8, it is characterized in that mud after handling in three months, mud containing rate is not less than 75%, and bearing capacity is not less than 10t/m
2
10. like the described method of one of claim 1-9, it is characterized in that, may further comprise the steps:
1) pre-buried drain board in the stockyard, and with drain board and vacuum manifold, be responsible for and be connected, composition vacuumizes the pipe network system;
2) the pre-buried prolong of layering in the stockyard makes every layer of prolong form the loop line, and between adjacent prolong, buries temperature inductor underground;
3) mud is imported the stockyard through pipeline, in the process of pipeline of flowing through, add flocculation agent and coagulant aids stage by stage, make mud rapid precipitation after flowing into the stockyard, discharge face source water then, mud is carried out tentatively concentrated;
4) repeating step 3) three times, the stockyard is filled with;
5) lay one to two-layer geotextile at the mud face, on geotextile, repave one to two-layer sealing membrane;
6) vacuum is responsible for connection vacuum unit, vacuumizes, extraction water can be used as burden pressure and is pressed on the sealing membrane;
7) treat that water outlet obviously reduces, mud containing rate reaches about 60% in the stockyard, or continuous 4 days of mud face sinkability stops to vacuumize during less than 2mm;
8) prolong is connected unit cooler, give the refrigeration of the condensing agent in the prolong, and condensing agent is circulated in prolong;
9) when the mud bulk temperature reaches-4 ℃, stop refrigeration;
10) in prolong, change logical hot water, mud is thawed;
When 11) treating that the mud bulk temperature reaches more than 4 ℃, stop logical hot water, begin to vacuumize;
12) it is obviously less to be evacuated to aquifer yield, or continuous 4 days of mud face sinkability is stopped work and checked and accepted during less than 1mm.
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| CN103321206A (en) * | 2013-07-03 | 2013-09-25 | 中交天津港航勘察设计研究院有限公司 | Drainage process for high-organic-matter-content river-lake dredging hydraulic-fill yard |
| CN103435245A (en) * | 2013-08-13 | 2013-12-11 | 浙江大学 | In-situ chemical conditioning and vacuum preloading reduction method and conditioning device for landfill sludge |
| CN103866757A (en) * | 2014-04-10 | 2014-06-18 | 宜兴市良旭焊接瓷件有限公司 | Soil dehydration desiccation or solidification method |
| CN103936254A (en) * | 2014-04-10 | 2014-07-23 | 江苏江达市政园林建设有限公司 | Method for drying silt or sludge |
| CN104849127A (en) * | 2015-05-29 | 2015-08-19 | 北京市理化分析测试中心 | Pretreatment method of oil field multi-component oil sludge and application |
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| CN112044929A (en) * | 2020-08-17 | 2020-12-08 | 盐城工学院 | Ecological dehydration and straw drainage body degradation method for fluid mud storage yard and straw drainage body |
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