CN104961270A - Agent vacuum pre-compression method for treating engineering waste slurry - Google Patents
Agent vacuum pre-compression method for treating engineering waste slurry Download PDFInfo
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- CN104961270A CN104961270A CN201510322445.6A CN201510322445A CN104961270A CN 104961270 A CN104961270 A CN 104961270A CN 201510322445 A CN201510322445 A CN 201510322445A CN 104961270 A CN104961270 A CN 104961270A
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- 239000002002 slurry Substances 0.000 title claims abstract description 41
- 239000002699 waste material Substances 0.000 title abstract description 5
- 230000006835 compression Effects 0.000 title abstract 7
- 238000007906 compression Methods 0.000 title abstract 7
- 239000007788 liquid Substances 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000013043 chemical agent Substances 0.000 claims abstract description 22
- 238000000926 separation method Methods 0.000 claims description 31
- 230000008569 process Effects 0.000 claims description 30
- 239000003814 drug Substances 0.000 claims description 25
- 239000000654 additive Substances 0.000 claims description 8
- 230000000996 additive effect Effects 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 4
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 4
- 239000004746 geotextile Substances 0.000 claims description 4
- 238000010327 methods by industry Methods 0.000 claims description 4
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- 238000010348 incorporation Methods 0.000 claims description 3
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- 238000007789 sealing Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 239000005995 Aluminium silicate Substances 0.000 claims description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 2
- 229920002472 Starch Polymers 0.000 claims description 2
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 2
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 claims description 2
- PZZYQPZGQPZBDN-UHFFFAOYSA-N aluminium silicate Chemical compound O=[Al]O[Si](=O)O[Al]=O PZZYQPZGQPZBDN-UHFFFAOYSA-N 0.000 claims description 2
- 229910000323 aluminium silicate Inorganic materials 0.000 claims description 2
- 235000012211 aluminium silicate Nutrition 0.000 claims description 2
- 239000000292 calcium oxide Substances 0.000 claims description 2
- 235000012255 calcium oxide Nutrition 0.000 claims description 2
- 239000010881 fly ash Substances 0.000 claims description 2
- 239000010440 gypsum Substances 0.000 claims description 2
- 229910052602 gypsum Inorganic materials 0.000 claims description 2
- 239000004571 lime Substances 0.000 claims description 2
- 229920002401 polyacrylamide Polymers 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 235000019698 starch Nutrition 0.000 claims description 2
- 239000008107 starch Substances 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 1
- 230000000813 microbial effect Effects 0.000 claims 1
- -1 microbial flocculant Substances 0.000 claims 1
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- 239000003643 water by type Substances 0.000 description 1
Landscapes
- Treatment Of Sludge (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention belongs to the field of technologies for protecting environments, and particularly discloses an agent vacuum pre-compression method for treating engineering waste slurry. The agent vacuum pre-compression method includes basic steps of adding appropriate quantities of appropriate types of chemical agents into the waste slurry to reduce the water content of the waste slurry and forming sediments with certain framework structures; applying vacuum loads to the sediments to pre-compress the sediments, reducing the water contents of the sediments until preset requirements are met, stopping applying the vacuum loads to the sediments, disassembling vacuum drainage systems and transporting mud to required places after solid and liquid in the mud are separated from each other. The agent vacuum pre-compression method has the advantages that the agent vacuum pre-compression method is high in treatment capacity and treatment efficiency, tens of thousands of squares of slurry to hundreds of thousands of squares of slurry can be treated at one step, and accordingly the agent vacuum pre-compression method is particularly applicable to intensive slurry treating; the mud is low in water content and high in strength after the solid and the liquid in the mud are separated from each other, and can be used as raw materials of building materials, and shortage of earthwork can be overcome if the mud is used for brick manufacturing or building place backfill; the agent vacuum pre-compression method can be used for land reclamation, enclosure regions can be filled with the ultimately treated mud, accordingly, the construction periods can be shortened, and the cost can be lowered.
Description
Technical field
The invention belongs to environmental protection technical field, be specifically related to the quick solid-liquid separating method of a kind of high-moisture mud.
Background technology
Increasing along with underground workss such as underground diaphragm wall, shield tunnel and cast-in place piles, in these construction process produce engineering discarded slurry and also get more and more, discarded slurry generally has following features: 1) clay content is high, dispersiveness is strong, naturally places in the short period of time or deadweight consolidation of being not difficult all the time; 2) water ratio is high, is generally about 160 ~ 300%, is in flow state for a long time, can cause severe contamination to place to place.
The conventional treatment method of current engineering discarded slurry (hereinafter referred to as " useless slurry ") has directly transports outward discharge, centrifuging, mechanism filter-pressing and vacuum filtration four kinds of common treatment processs.(1) outward transport discharge will be transported to countryside outside useless slurry and make a kind for the treatment of process of its natural mummification.The processing efficiency of this method is very high, but original-state soil can be caused to harden and make it lose the ability of cultivating if be discharged into land, if be discharged into river course, ocean, can produce pollute waters, place; (2) vacuum filtration utilizes vacuum press filter by a kind of effective treating method of useless slurry solid-liquid separation, and deficiency is that processing efficiency is low, and easily produces silting due to during the mud higher at process clay content, therefore, also faces bottleneck at technical elements.(3) centrifuging loads in impeller pump by mud, and in the impeller pump of high speed rotating, liquid is discharged, a kind of method that solid stays, and weak point is that processing efficiency is lower; (4) mechanism filter-pressing can in the short period of time by solid particulate and liquid separation in useless slurry, the mud cake produced after being separated can be used as engineering materials (as burnt brick) and uses, shortcoming is that processing efficiency is low, occupied ground is large, is not suitable for the working-yard process useless slurry limited in place.
In above four kinds of disposal technologies, at present normal what adopt is outward transport discharge, and backward in technique and additive method processing costs is seen in this poor with the environmental consciousness of people, existing treatment of mud, and to cross high reason relevant.The environment of this outward transport discharging modes adopted for a long time to the storage ground such as ocean, land has produced and has polluted or be about to face potential severe contamination threat, and this situation is being aggravated always in recent years.Along with people's environmental consciousness strengthens gradually, this extensive mud disposal options is constantly under suspicion and opposes, an urgent demand those skilled in the art develop efficiently, the mud disposal technology of environmental protection, a kind of mud that the present invention is developed under this background just disposes (i.e. solid-liquid separation) novel method, it particularly adopts the vacuum preloading method being different from vacuum filtration process to combine with chemical additive to carry out quick, efficient, intensive disposal to mud, have broad application prospects and good social benefit.
Summary of the invention
The object of the invention is to not enough, propose a kind of engineering useless slurry treatment process that can be in enormous quantities, quick, intensive for the current engineering problems that exist in slurry disposal technology of giving up.
The engineering that the present invention proposes useless slurry treatment process, i.e. solid-liquid separating method, being combine making mud small particles become oarse-grained interpolation chemical method with the vacuum method (being different from vacuum filtration process above) being suitable for the process of big area dredged clays, being called medicament vacuum method.Its basic step is: the chemical agent first by adding suitable kind and quantity in useless slurry makes its water content reduce, and forms the throw out with certain skeleton structure; And then precompressed is carried out to throw out applying vacuum load, loading through after a while makes throw out water content reduce further, to be reduced to stopping after pre-provisioning request loading, remove low-pressure drainage system, and the earth after solid-liquid separation is transported to the place of needs.
Should invent and interpolation chemical method and vacuum method two kinds of methods are organically combined, the two is mutually promoted and the relation of supplementing, adding chemical agent is filter membrane silting phenomenon for preventing in vacuum method, greatly improves the solid-liquid separation efficiency of vacuum preloading; Vacuum method is to reach the re-set target only adding chemical agent and cannot complete.
The present invention propose medicament vacuum method carry out engineering give up slurry process operation steps be:
(1) characteristic intending the useless slurry of process is analyzed, by making soil particle maximization principle in mud, determine chemical agent A and B (medicament C can be added as required) respective concentration and proportioning, with useless volume of slurry for radix, the additive ratio of A, B, C is about 0.01% ~ 0.06%, 0.05% ~ 0.4%, 0.001% ~ 0.005% respectively.
(2) according to determined incorporation, proportioning, according to first adding A, the order adding B after waiting for 30 ~ 60min again adds chemical agent A and B (can add medicament C as required) in the settling tank that useless slurry is housed, adopt low-speed agitator be fully uniformly mixed and leave standstill 120 ~ 180min, make it complete natural sedimentation.
(3) leave standstill after certain hour and sample from settling tank, carry out water ratio, grade test, when indices reaches required value, by upper liquid discharge, completes the first step solid-liquid separation.
(4) with useless to starch natural sedimentation synchronous, in vacuum solid-liquid separation tank, vacuum drainage network system is arranged by design requirements.
(5), after the first step solid-liquid separation terminates, throw out pump is pumped the solid-liquid separation tank to arranging vacuum network water exhaust system, and pumpage is determined according to design requirements.
(6) on throw out, lay geotextile, sealing membrane etc. on request, and the house steward of vacuum drainage network system is connected with vacuum pump, by vacuum preloading (vacuum degree control is at 30 ~ 80kPa), carry out second step solid-liquid separation.
(7) in vacuum preloading process, the sedimentary character of sampling analysis at set intervals, stops vacuum load when reaching the indexs such as the water ratio of design requirements and intensity.
Remove vacuum network water exhaust system after terminating, and the throw out earthwork car in vacuum solid-liquid separation tank is transported to required place, complete process.
In the present invention, described vacuum drainage network system, comprise: the compositions such as vacuum pump 6, drainage connecting pipe 7, main drain 8, transverse drain 9 and vertical drainage pipe 10, transverse drain 9 and vertical drainage pipe 10 are all arranged in parallel separately, spacing is 0.5 ~ 1.2m, the two intersect in length and breadth composition space net structure be distributed in vacuum solid-liquid separation tank; Each transverse drain and vertical drainage manifold are incorporated into drainage connecting pipe 7, and are connected with described vacuum pump 6.
Above construction process is the conventional procedure of vacuum solid-liquid separation, in concrete enforcement, and each parameter, such as, in drainage network the system spacing of water shoot and length, chimney filter, supervisor spacing and placement form etc., all need through calculating, incorporation engineering practical experience is determined simultaneously.Wherein, main drain 8 can adopt the filter pipes such as pvc pipe, steel pipe, corrugated tube, transverse drain 9 and vertical drainage pipe 10 can adopt the drainage channels such as soft or hard PVC pipe, ripple chimney filter, plastic draining board, flexible porous tube outsourcing filter membrane, each drain header converges to drainage connecting pipe 7, and is connected with described vacuum pump 6.
For the mud be discharged in place, can be injected in mud by medicament by high pressure jet grouting (dry agent or humectant) mode, make it to mix and precipitate, other steps are the same.
In the present invention, described medicament A is used for absorption, net is caught, charge neutrality, and increases radii of soil particles etc., and described medicament B plays the effect strengthening medicament A, and described medicament C, in vacuum preloading process, for drainage, raises the efficiency.Usual medicament A adopts polyacrylamide, polymerize aluminum chloride, aluminium iron polychloride or polymer aluminium silicate etc., and medicament B adopts flyash, unslaked lime or white lime etc., and medicament C adopts gypsum, sodium hydroxide etc.
The useless slurry of engineering of the present invention, except the useless slurry produced in building construction process, also comprise: the muddy water miscellany etc. enclosing the high-moisture fluidised forms such as the mud produced in washup mud, urban life and the water treatment procedure in the blowing-filling sludge produced in extra large reclamation by pumping filling process, the dredging silt produced in improved channels, mining process.
Medicament vacuum method of the present invention, compared with existing mud solid-liquid separation technique, has following distinguishing feature:
(1) vacuum processing method in the present invention is different from common vacuum filter press technique, and be used to the vacuum method processing big area dredging silt, have the advantages that treatment capacity is large, processing efficiency is high, can disposable process several ten thousand to tens side's mud, be particularly suitable for intensive treatment of mud.
(2) before vacuum preloading, add corresponding chemical agent, this chemical agent is not only and is carried out preliminary solid-liquid separation to mud, also has the radii of soil particles increased in mud, forms the effect of space structure and increase throw out penetrating quality.In A, B, C tri-kinds of chemical agents, the effects such as medicament A plays absorption, net is caught, charge neutrality and increase radii of soil particles, medicament B plays the effect strengthening medicament A, the effect that medicament C plays drainage, raises the efficiency in vacuum preloading process.
(3) medicament vacuum method has the effect preventing water shoot outsourcing filter membrane silting in vacuum preloading process, can increase substantially the efficiency of vacuum preloading solid-liquid separation.
meaning of the present invention and application prospect
(1) for discarded slurry find one effectively, the process approach of environmental protection, the pollution of discharging and ocean environment and terrestrial environment being caused can be greatly reduced, for descendants retains larger living space.
(2) earth after being separated has lower water content and higher intensity, can be used as the raw material of material of construction, as can be used for brickmaking.
(3) earth after being separated has lower water content and higher intensity, may be used for the building field needing backfill, supplements the deficiency of the earthwork.
(4) directly combine with reclaiming fields from the sea, need the earthwork with making, the mud after process needs place to go, and the two supplements mutually, the earth after finally processing can be backfilling into enclosure region; Also the mud through certain chemicals treatment directly can be backfilling in corral place, then carry out vacuum preloading process, the object turning waste into wealth to reach, save the duration and reduce costs.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of medicament vacuum method.
Fig. 2 is the settling tank longitudinal diagram of medicament vacuum method.
Fig. 3 is the vacuum solid-liquid separation tank longitudinal diagram of medicament vacuum method.
Fig. 4 is the vacuum solid-liquid separation tank vertical view of Fig. 3.
Number in the figure: 1 low-speed mixer, 2 cystoses, 3 admixture pumping lines, 4 useless slurry pumping lines, 5 original useless slurries, 6 vacuum pumps, 7 drainage connecting pipes, 8 main drains, 9 transverse drains, 10 vertical drainage pipes, 11 geotextile, 12 geomembranes, 13 throw outs.H1 is settling tank height, and L1 is settling tank length, and H is vacuum solid-liquid separation tank height, and L is vacuum solid-liquid separation tank length, and B is vacuum solid-liquid separation tank width.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is the process flow sheet of process mud of the present invention, and its key step is as follows:
(1) scene takes engineering to give up slurry samples, carries out determination and analysis to the special physics such as its water ratio, granulometric composition, mineralogical composition, pH value, proportion, chemical property.
(2) according to addition and the proportioning of analytical results determination chemical agent A, B of step (1), the additive ratio of A, B is about 0.01% ~ 0.06%, 0.05% ~ 0.4% respectively.
(3) according to the working-yard practical situation such as place size, artificial, mechanical one-shift, pending useless slurry amount, design useless slurry settling tank, vacuum solid-liquid separation tank, pumpage etc., as shown in Fig. 2 ~ 4.
(4) arrange settling tank, vacuum solid-liquid separation tank, be provided with low-speed mixer 1 in settling tank, low-speed mixer 1 is connected with cystose 2, useless slurry 5 is squeezed in settling tank to certain altitude through pumping line 4.
(5) additive A, B are squeezed in settling tank through pumping line 3 successively, and stir with low-speed mixer 1, useless slurry is fully mixed with additive.
(6) leaving standstill adding the useless pulp mixture after chemical agent, adopting the throw out in settling tank to analyze every 10 ~ 30min time, emptying supernatant liquor after the index such as water ratio, size distribution reaches requirement.
(7) while above-mentioned steps (5) ~ (6) are carried out, in vacuum solid-liquid separation tank, transverse drain 9 and vertical drainage plate 10 are arranged in separate tank by spacing 0.5 ~ 1.2m respectively, as shown in Figure 3,4.
(8) throw out and pending useless slurry 13 pump are pumped the solid-liquid separation tank to arranging vacuum network water exhaust system, pumpage is determined according to design requirements.
(9) on throw out, lay geotextile 11, sealing membrane 12 etc. on request, and be connected with house steward 8 by water shoot, 8 are connected with vacuum pump 6 by pipe connecting 7, carry out vacuum load after completing layout.
(10) in vacuum preloading process, on request at interval of certain hour, the sedimentary character of sampling analysis, when meeting the requirements of water ratio and intensity, stops vacuum load.
(11) terminate rear dismounting vacuum network water exhaust system, and the throw out earthwork car in vacuum solid-liquid separation tank is transported to required place, complete process.
Claims (3)
1. process engineering give up slurry a medicament vacuum method, it is characterized in that concrete operation step is:
(1) characteristic intending the useless slurry of process is analyzed, by indoor settlement column test, according to particles generation maximization principle, determine the respective concentration of chemical agent A and B and proportioning, with useless volume of slurry for radix, the additive ratio of chemical agent A, B is respectively 0.01% ~ 0.06%, 0.05% ~ 0.4%;
(2) according to determined incorporation, proportioning, according to first adding chemical agent A, the order of chemical agent B is added again after waiting for 30 ~ 60min, chemical agent A and chemical agent B is added in the settling tank that useless slurry is housed, adopt low-speed agitator be fully uniformly mixed and leave standstill 120 ~ 180min, make it complete natural sedimentation;
(3) leave standstill after certain hour and sample from settling tank, carry out water ratio, grade test, when indices reaches required value, by upper liquid discharge, completes the first step solid-liquid separation;
(4) with useless to starch natural sedimentation synchronous, in vacuum solid-liquid separation tank, vacuum drainage network system is arranged by design requirements;
(5), after the first step solid-liquid separation terminates, throw out pump is pumped the solid-liquid separation tank to arranging vacuum network water exhaust system, and pumpage is determined according to design requirements;
(6) on throw out, lay geotextile, sealing membrane on request, and the house steward of vacuum drainage network system be connected with vacuum pump, carry out vacuum preloading, vacuum degree control, at 30 ~ 80kPa, carries out second step solid-liquid separation;
(7) in vacuum preloading process, the sedimentary character of sampling analysis at set intervals, stops vacuum load when reaching the indexs such as the water ratio of design requirements and intensity;
Wherein, chemical agent A is selected from polyacrylamide, polymerize aluminum chloride, aluminium iron polychloride, polymer aluminium silicate, microbial flocculant, and chemical agent B is selected from flyash, unslaked lime, white lime, diatomite, perlite.
2. process engineering according to claim 1 give up slurry medicament vacuum method, it is characterized in that also adding chemical agent C in step (2), chemical agent C additive ratio is 0.001% ~ 0.005%; Chemical agent C is selected from gypsum, sodium hydroxide.
3. process engineering according to claim 1 give up slurry medicament vacuum method, it is characterized in that described vacuum drainage network system, comprise: vacuum pump (6), drainage connecting pipe (7), main drain (8), transverse drain (9) and vertical drainage pipe (10), transverse drain (9) and vertical drainage pipe (10) some, laterally be arranged in parallel according to 0.5 ~ 1.2m spacing respectively with vertical drainage pipe, each transverse drain and vertical drainage manifold are incorporated into drainage connecting pipe (7), and are connected with described vacuum pump (6).
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| CN201510322445.6A CN104961270B (en) | 2015-06-13 | 2015-06-13 | A kind of medicament vacuum method for handling engineering useless slurry |
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| CN201510322445.6A CN104961270B (en) | 2015-06-13 | 2015-06-13 | A kind of medicament vacuum method for handling engineering useless slurry |
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Cited By (9)
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| CN105645709A (en) * | 2016-03-12 | 2016-06-08 | 上海大学 | Dissolved gas and reagent integrated vacuum preloading method |
| CN109293066A (en) * | 2018-11-11 | 2019-02-01 | 中铁十四局集团大盾构工程有限公司 | A kind of mud rapid flocculation device and flucculation process |
| CN110723878A (en) * | 2019-10-11 | 2020-01-24 | 上海大学 | Electroosmosis-medicament vacuum preloading method |
| CN110922005A (en) * | 2019-12-09 | 2020-03-27 | 上海大学 | Intelligent integrated in-situ treatment method and device for sludge medicament vacuum preloading in temporary storage area |
| CN112499920A (en) * | 2020-12-25 | 2021-03-16 | 中国电建集团华东勘测设计研究院有限公司 | Waste slurry dehydration and solidification treatment method |
| CN112759208A (en) * | 2020-12-31 | 2021-05-07 | 浙大城市学院 | Layered dehydration and solidification treatment device for engineering waste slurry and use method |
| CN113235566A (en) * | 2021-06-02 | 2021-08-10 | 中国冶金地质总局青岛地质勘查院 | Local medicament vacuum preloading method for treating hydraulic fill foundation |
| CN115057605A (en) * | 2022-07-12 | 2022-09-16 | 上海广联环境岩土工程股份有限公司 | Movable full-automatic filter pressing process for treating engineering waste slurry |
| CN115286197A (en) * | 2022-07-12 | 2022-11-04 | 上海广联环境岩土工程股份有限公司 | Automatic engineering slurry treatment process combining air pressurization method and filter pressing |
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| CN110723878A (en) * | 2019-10-11 | 2020-01-24 | 上海大学 | Electroosmosis-medicament vacuum preloading method |
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| CN110922005B (en) * | 2019-12-09 | 2022-11-08 | 上海大学 | Intelligent integrated in-situ treatment method and device for sludge medicament vacuum preloading in temporary storage area |
| CN112499920B (en) * | 2020-12-25 | 2022-06-28 | 中国电建集团华东勘测设计研究院有限公司 | Waste slurry dehydration and solidification treatment method |
| CN112499920A (en) * | 2020-12-25 | 2021-03-16 | 中国电建集团华东勘测设计研究院有限公司 | Waste slurry dehydration and solidification treatment method |
| CN112759208B (en) * | 2020-12-31 | 2022-06-17 | 浙大城市学院 | Layered dehydration and solidification treatment device for engineering waste slurry and use method |
| CN112759208A (en) * | 2020-12-31 | 2021-05-07 | 浙大城市学院 | Layered dehydration and solidification treatment device for engineering waste slurry and use method |
| CN113235566A (en) * | 2021-06-02 | 2021-08-10 | 中国冶金地质总局青岛地质勘查院 | Local medicament vacuum preloading method for treating hydraulic fill foundation |
| CN115057605A (en) * | 2022-07-12 | 2022-09-16 | 上海广联环境岩土工程股份有限公司 | Movable full-automatic filter pressing process for treating engineering waste slurry |
| CN115286197A (en) * | 2022-07-12 | 2022-11-04 | 上海广联环境岩土工程股份有限公司 | Automatic engineering slurry treatment process combining air pressurization method and filter pressing |
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