CN115159811A - Zero-emission underground engineering slurry treatment construction method - Google Patents
Zero-emission underground engineering slurry treatment construction method Download PDFInfo
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- CN115159811A CN115159811A CN202210720530.8A CN202210720530A CN115159811A CN 115159811 A CN115159811 A CN 115159811A CN 202210720530 A CN202210720530 A CN 202210720530A CN 115159811 A CN115159811 A CN 115159811A
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- 239000002002 slurry Substances 0.000 title claims abstract description 136
- 238000010276 construction Methods 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000005189 flocculation Methods 0.000 claims abstract description 41
- 230000016615 flocculation Effects 0.000 claims abstract description 41
- 238000003756 stirring Methods 0.000 claims abstract description 33
- 239000008394 flocculating agent Substances 0.000 claims abstract description 31
- 239000002245 particle Substances 0.000 claims abstract description 26
- 208000005156 Dehydration Diseases 0.000 claims abstract description 22
- 230000018044 dehydration Effects 0.000 claims abstract description 22
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 22
- 238000012216 screening Methods 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 239000002689 soil Substances 0.000 claims abstract description 11
- 238000004321 preservation Methods 0.000 claims abstract description 10
- 238000007865 diluting Methods 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- 238000000926 separation method Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 13
- 229920001661 Chitosan Polymers 0.000 claims description 12
- 229920002401 polyacrylamide Polymers 0.000 claims description 11
- 239000004576 sand Substances 0.000 claims description 11
- 239000002699 waste material Substances 0.000 claims description 11
- 229920000805 Polyaspartic acid Polymers 0.000 claims description 10
- 229920002310 Welan gum Polymers 0.000 claims description 10
- 108010064470 polyaspartate Proteins 0.000 claims description 10
- 238000004062 sedimentation Methods 0.000 claims description 9
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 8
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 125000002091 cationic group Chemical group 0.000 claims description 8
- 229920002678 cellulose Polymers 0.000 claims description 8
- 239000001913 cellulose Substances 0.000 claims description 8
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 claims description 8
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 8
- 239000012991 xanthate Substances 0.000 claims description 8
- 229920002518 Polyallylamine hydrochloride Polymers 0.000 claims description 6
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 6
- 239000005018 casein Substances 0.000 claims description 6
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 claims description 6
- 235000021240 caseins Nutrition 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 241001464837 Viridiplantae Species 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 26
- 230000001737 promoting effect Effects 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 description 36
- 230000000052 comparative effect Effects 0.000 description 18
- 239000012530 fluid Substances 0.000 description 15
- 238000001179 sorption measurement Methods 0.000 description 15
- 239000000084 colloidal system Substances 0.000 description 10
- 239000010419 fine particle Substances 0.000 description 10
- 238000001556 precipitation Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 239000002244 precipitate Substances 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 230000002195 synergetic effect Effects 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
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- 239000011859 microparticle Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229920001221 xylan Polymers 0.000 description 2
- 150000004823 xylans Chemical class 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 238000011085 pressure filtration Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The application relates to a zero-emission underground engineering slurry treatment construction method, which comprises the following steps: step 1, mixing and diluting the slurry and water according to a mass ratio of 1 (1-2), adding 5-10 parts by mass of a treating agent, and uniformly mixing and stirring; step 2, screening sandstone: removing sandy soil with the particle size larger than 1mm in the slurry; step 3, adding the slurry into a flocculating agent A with the slurry amount of 2-4%, and uniformly stirring; standing for 30-60min under heat preservation; step 4, secondary flocculation: adding a flocculating agent B with the mud amount of 0.2-0.4% into the mud, and uniformly stirring; step 5, dehydration treatment; and 6, treating the emission. The application has the dewatering efficiency of promoting underground works mud and handling for the effect of recycle that the result of handling realizes the zero release.
Description
Technical Field
The application relates to the technical field of underground engineering slurry treatment, in particular to a zero-emission underground engineering slurry treatment construction method.
Background
In the construction process of subways, bridges and high-rise buildings, a mode of drilling and pouring pile foundations or underground continuous walls is usually adopted. However, during drilling or grooving, it is necessary to perform wall protection using mud. After the drilling or grooving operation is completed, a large amount of slurry remains as waste slurry. The waste slurry is a very complex heterogeneous body consisting of organic debris, bacterial cells, inorganic particles, colloids and the like, the components of the waste slurry are very complex due to high water content and use of various additives, and the direct discharge can cause serious pollution to the environment.
The current commonly used slurry treatment mode is to carry out chemical flocculation and then carry out filter pressing, and the mud and water of the waste slurry are separated by the method, so that the aim of reduction is realized, and the cleaning or the comprehensive utilization is convenient. However, in the actual application process, due to the colloid property of the slurry, fine particles in the slurry are difficult to separate from water, so that the flocculation and precipitation are difficult and slow, and the water content of the filter-pressed sludge block is high and cannot meet the requirement of the later-stage sludge treatment.
In view of the above problems, the present inventors have considered that the conventional slurry treatment construction method has disadvantages of low dewatering efficiency and high cake water content.
Disclosure of Invention
In order to improve the dehydration efficiency of underground engineering slurry treatment and enable the treated product to realize resource recycling, the application provides a zero-emission underground engineering slurry treatment construction method.
The application provides a zero-emission underground engineering slurry treatment construction method which adopts the following technical scheme:
the zero-emission underground engineering slurry treatment construction method comprises the following steps:
step 1, slurry pretreatment: collecting the slurry to a waste slurry tank, mixing and diluting the slurry and water according to the mass ratio of 1 (1-2), adding 5-10 parts by mass of treating agent, and uniformly mixing and stirring; wherein the treatment solution comprises at least 30-40% by weight of polyaspartic acid;
step 2, screening sand and stone: screening the pretreated slurry to remove impurities with large particle size in the slurry to obtain sandy soil with the particle size larger than 1 mm;
step 3, primary flocculation: feeding the slurry sieved in the step 2 into a sedimentation tank, adding a flocculating agent A accounting for 2% -4% of the slurry amount, and uniformly stirring; standing for 30-60min under heat preservation to obtain first-stage treated slurry; wherein the flocculating agent A comprises two or more of welan gum, chitosan and polymeric aluminum ferric silicate;
step 4, secondary flocculation: adding a flocculating agent B with the mud amount of 0.2-0.4% into the primary treated mud, and uniformly stirring; wherein the flocculating agent B comprises 1-3 parts by mass of polyallylamine hydrochloride, 2-4 parts by mass of cationic polyacrylamide, 10-15 parts by mass of aluminum sulfate, 5-10 parts by mass of casein and 30-35 parts by mass of water;
and 5, dehydration treatment: sending the slurry into a belt filter press for dehydration and separation, and collecting separated clear water and mud cakes;
step 6, emission treatment: the sandy soil in the step 2 is used as building pebbles and building sand or is backfilled; and (5) using the clean water in the step 5 as sand washing water and using the mud cake as green plant wall building green bricks.
By adopting the technical scheme, the on-site waste slurry is diluted firstly, and then is treated by adding the treatment fluid, the components in the treatment fluid can reduce the cohesive property among particles in the slurry under the synergistic action, when the slurry pretreated by the treatment fluid is subjected to screening treatment, the screening resistance is reduced, the screening efficiency is improved, the screening is more sufficient, the screening treatment is used for sorting sandy soil with larger particles in the slurry, and the first separation of the slurry is realized; the slurry after sand removal is sent into a sedimentation tank, a flocculating agent A is added for primary flocculation, welan gum, chitosan and polymeric aluminum ferric silicate in the flocculating agent A are combined and compounded for use, a colloid with a strong adsorption effect can be formed, and the colloid can continuously adsorb fine particles in the slurry in the process of heat preservation and standing, so that the cohesion of the fine particles is promoted, a certain flocculent precipitate is formed, and the separation of the fine particles and water is realized; then adding a flocculating agent B, wherein the flocculating agent B is added to further adsorb micro particles in the slurry to improve the flocculation effect, and can adsorb formed flocculent precipitates to form floccules so as to facilitate subsequent dehydration and separation; and (3) feeding the flocculated slurry into a belt filter press for treatment, and further completely separating fine particles from clear water in the slurry, thereby completing the second separation of the slurry. The construction method is used for treating the underground slurry, the dewatering efficiency is high, the dewatering effect is good, the water content of the mud cakes is low, the separated sandy soil, mud cake clay, clear water and the like can be recycled on the construction site and can be reused for building development, and the construction method has good economic benefits.
Preferably, the treatment fluid consists of polyaspartic acid 30-40% wt, triethanolamine 10-20% wt, sodium tripolyphosphate 1-3% wt and water balance.
By adopting the technical scheme, the triethanolamine serving as the surfactant can reduce the surface energy of the particle surface in the slurry; the polyaspartic acid has strong chelating ability to ions and better dispersion effect; the sodium tripolyphosphate has the functions of chelation, suspension, dispersion, peptization, emulsification, pH buffering and the like; the polyaspartic acid, the triethanolamine, the sodium tripolyphosphate and the water are compounded in a synergistic manner, so that the cohesive action among particle substances in the slurry can be reduced, the resistance in the vibrating screening process is further reduced, the vibrating screening effect is better, and the subsequent flocculation separation is facilitated.
Preferably, the flocculant A is prepared from welan gum, chitosan, polymeric aluminum ferric silicate and water according to the mass ratio of (3-5): (1-3): 0.8:13 at 30-40 deg.C.
Through adopting above-mentioned technical scheme, welan gum, chitosan, polymerized aluminum ferric silicate, water are compounded according to certain ratio combination, can form the colloidal substance that has stronger adsorptivity, this kind of colloidal substance has great adsorption effect to the tiny particle in the mud at the stirring in-process, and it is firm to adsorb, keep warm under quiet, more granule adsorbs gradually and piles up, form flocculent deposit, and then can realize the separation of tiny particle and water in the mud, its stronger adsorption effect has realized the quick flocculation to mud, and then help promoting the flocculation efficiency of mud.
Preferably, the flocculant B also comprises 0.5-0.7 part by mass of cellulose xanthate.
By adopting the technical scheme, the cellulose xanthate not only can react with monovalent metal to generate salt, but also can react with polyvalent metal to generate polyvalent metal salt, the polyvalent metal salt is insoluble in alkali and water solution, and the addition of the cellulose xanthate can further promote the adsorption and flocculation effects of the flocculant B on tiny particles in the slurry, so that the efficiency of slurry flocculation treatment is improved.
Preferably, the temperature for heat preservation in the step 3 is 40-50 ℃.
By adopting the technical scheme, the standing and heat preservation are carried out at 40-50 ℃, the colloid substance formed under the action of each component in the flocculating agent A can keep better viscosity and fluidity in the temperature range, the structural performance is stable, the adsorption effect is durable, and the better separation of the particles and water in the slurry is further facilitated.
Preferably, the molecular weight of the cationic polyacrylamide is 1200-1400 ten thousand.
By adopting the technical scheme, the molecular weight of polyacrylamide can adjust the size of the floccule, the small floccule can influence the drainage speed, the large floccule can restrict more water to reduce the mud dryness, and the polyacrylamide can be matched with other components in the flocculant B under the molecular weight of 1200-1400 ten thousand to realize better flocculation effect.
Preferably, the filter belt tensioning air pressure in the step 5 is 0.3-0.5 MPa.
Through adopting above-mentioned technical scheme, the filter belt is the main component part of belt filter press, and the solid-liquid separation of mud uses the filter belt as the medium, can dewater by mud under the tensile force and the squeezing force of two filter belts, can help reducing the moisture content in the mud piece through injecing suitable filter belt tensioning atmospheric pressure, improves the dehydration effect.
Preferably, in the step 2, the slurry is firstly screened by a coarse screen to remove particles larger than 5 mm; then sieving by a fine sieve to remove particles larger than 1 mm.
Through adopting above-mentioned technical scheme, mud passes through twice screening of coarse sand and fine screen, helps promoting the screening effect on the one hand, and on the other hand makes mud colloidal structure disperse at the in-process of screening, and then helps the sedimentation separation of mud granule in the follow-up flocculation treatment.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the method comprises the steps of diluting the waste slurry, adding the treatment liquid for treatment, reducing the cohesive property of the slurry pretreated by the treatment liquid, contributing to reducing screening resistance and improving screening efficiency, screening to obtain sandy soil with larger particles in the slurry, and realizing the first separation of the slurry; the desanded slurry is sent into a sedimentation tank, a flocculating agent A is added for primary flocculation and sedimentation, components in the flocculating agent A have synergistic effect, a colloid with strong adsorption effect can be formed, and the colloid can adsorb fine particles in the slurry in the process of heat preservation and standing to form flocculent sediment, so that the separation of the fine particles from water is realized; then adding a flocculating agent B, wherein the flocculating agent B can form a floccule with the formed flocculent precipitate under the further flocculation adsorption, so that the subsequent dehydration separation is facilitated; the slurry after flocculation treatment is sent into a belt filter press for dehydration and separation treatment; by adopting the construction method to treat the underground slurry, the dehydration efficiency is high, the dehydration effect is good, the water content of the mud cake is lower, the separated sandy soil, clay, clear water and the like can be recycled on site and can be reused for building development, and the construction method has better economic benefit;
2. the treatment fluid consists of 30-40% of polyaspartic acid, 10-20% of triethanolamine, 1-3% of sodium tripolyphosphate and the balance of water; the polyaspartic acid, the triethanolamine, the sodium tripolyphosphate and the water are compounded in a synergistic manner, so that the cohesive action among granular substances in the slurry can be reduced, the resistance in the vibrating screening process is further reduced, and the vibrating screening effect is better;
3. the flocculant A compounded by the welan gum, the chitosan, the polymeric ferric aluminum silicate and the water according to a certain proportion has stronger adsorption and bonding performance, has larger adsorption effect on tiny particles in the slurry in the stirring process, and is gradually adsorbed and accumulated to form flocculent precipitate under heat preservation and standing, so that the separation of the tiny particles and the water in the slurry is realized, and the fast flocculation of the slurry is realized by the flocculant A with stronger adsorption effect, thereby being beneficial to improving the flocculation efficiency of the slurry.
Detailed Description
Preparation example
Preparation example 1
The preparation example discloses a preparation method of a treatment fluid, which specifically comprises the following steps: 200g of polyaspartic acid, 100g of triethanolamine, 10g of sodium tripolyphosphate and 690g of water are mixed and added into a stirring pot, and the mixture is stirred at normal temperature at the rotating speed of 200r/min for 10min to obtain the treatment fluid.
Preparation example 2
The preparation example discloses a preparation method of a treatment fluid, which specifically comprises the following steps: 300g of polyaspartic acid, 200g of triethanolamine, 30g of sodium tripolyphosphate and 470g of water are mixed and added into a stirring pot, and the mixture is stirred at normal temperature at the rotating speed of 200r/min for 10min to obtain the treating fluid.
Preparation example 3
The preparation example discloses a preparation method of a flocculating agent A, which specifically comprises the following steps: 168.54g welan gum, 56.18g chitosan, 44.94g polymeric aluminum ferric silicate and 730.34g water are mixed and added into a stirring pot, and stirred for 10min at the temperature of 30 ℃ and the rotating speed of 1500r/min to obtain the flocculant A.
Preparation example 4
The preparation example discloses a preparation method of a flocculant A, which specifically comprises the following steps: 229.36g welan gum, 137.61g chitosan, 36.70g polymeric aluminum ferric silicate and 596.33g water are mixed and added into a stirring pot, and stirred at the rotating speed of 1500r/min for 10min at the temperature of 40 ℃, so that the flocculant A is obtained.
Preparation example 5
The preparation example discloses a preparation method of a flocculant B, which specifically comprises the following steps: and (3) mixing 10g of polyallylamine hydrochloride, 20g of cationic polyacrylamide, 100g of aluminum sulfate, 50g of casein and 300g of water, adding into a stirring pot, and stirring at the normal temperature at the rotating speed of 1500r/min for 10min to obtain the flocculant B.
Preparation example 6
The preparation example discloses a preparation method of a flocculant B, which specifically comprises the following steps: and (3) mixing 30g of polyallylamine hydrochloride, 40g of cationic polyacrylamide, 150g of aluminum sulfate, 100g of casein and 350g of water, adding into a stirring pot, and stirring at the normal temperature at the rotating speed of 1500r/min for 10min to obtain the flocculant B.
Preparation example 7
The preparation example discloses a preparation method of a flocculant B, which specifically comprises the following steps: and (3) mixing 30g of polyallylamine hydrochloride, 40g of cationic polyacrylamide, 150g of aluminum sulfate, 100g of casein, 5g of cellulose xanthate and 350g of water, adding into a stirring pot, and stirring at normal temperature at the rotating speed of 1500r/min for 10min to obtain the flocculant B.
Preparation example 8
The preparation example discloses a preparation method of a flocculant B, which specifically comprises the following steps: and (3) mixing 30g of polyallylamine hydrochloride, 40g of cationic polyacrylamide, 150g of aluminum sulfate, 100g of casein, 7g of cellulose xanthate and 350g of water, adding into a stirring pot, and stirring at normal temperature at the rotating speed of 1500r/min for 10min to obtain the flocculant B.
Examples
Example 1
The embodiment discloses a zero-emission underground engineering slurry treatment construction method, which specifically comprises the following steps:
step 1, slurry pretreatment: collecting the slurry to a waste slurry pool, mixing and diluting the slurry and water according to the mass ratio of 1:1, adding 50g of treating agent, and mixing and stirring for 1h until the mixture is uniformly stirred; wherein the treatment fluid is the treatment fluid prepared in the preparation example 1;
step 2, screening sand and stone: adding the pretreated slurry into a vibrating screen through a slurry inlet pipe, wherein a fine-mesh vibrating screen and a coarse-mesh vibrating screen are arranged in the vibrating screen along the vertical direction, the fine-mesh vibrating screen is positioned above the coarse-mesh vibrating screen, and the size of the fine-mesh vibrating screen is smaller than that of the coarse-mesh vibrating screen; a second discharging tank is arranged right above the fine mesh vibrating screen, and a first discharging tank is arranged above the coarse mesh vibrating screen; the slurry entering the vibrating screen directly falls on the coarse screen vibrating screen through the first discharging tank, and impurity particles with the particle size larger than 5mm in the slurry are removed from the slurry through the coarse screen vibrating screen; the slurry obtained by screening enters a slurry storage tank below the coarse screen, then is pumped into a second discharging tank from the slurry storage tank by a slurry pump, and then passes through a fine-mesh vibrating screen which is arranged above the coarse screen in the second discharging tank, so that impurity particles with the particle size larger than 1mm in the slurry are removed; the mud sieved by the fine mesh vibrating screen passes through the coarse mesh vibrating screen again to realize further sieving; collecting the screened impurity particles to obtain sandy soil;
step 3, primary flocculation: feeding the slurry sieved in the step 2 into a sedimentation tank, adding a flocculating agent A with the slurry amount of 2%, and stirring at the speed of 60r/min for 15min; standing at 40 deg.C for 60min to obtain first-stage treated slurry; wherein the flocculant A is prepared in the preparation example 3;
step 4, secondary flocculation: adding a flocculating agent B with the mud quantity of 0.2 percent into the first-stage treated mud, and stirring for 10min at the speed of 90 r/min; wherein the flocculating agent B is the flocculating agent B prepared in the preparation example 5;
and 5, dehydration treatment: sending the slurry into a belt filter press, performing filter pressing treatment through a gravity dehydration area, separating clear water and mud cakes under the tensioning air pressure of a filter belt of 0.3MPa, and collecting the separated clear water and mud cakes;
step 6, emission treatment: the sandy soil in the step 2 is used as building pebbles and building sand or is backfilled; and (5) using the clean water in the step 5 as sand washing water and using the mud cake as green plant wall building green bricks.
Example 2
The embodiment discloses a zero-emission underground engineering slurry treatment construction method, which is different from the embodiment 1 in that:
step 1, slurry pretreatment: collecting the slurry to a waste slurry pool, mixing and diluting the slurry and water according to the mass ratio of 1:2, adding 100g of treating agent, and mixing and stirring for 1h until the mixture is uniformly stirred; wherein the treatment fluid is the treatment fluid prepared in the preparation example 2;
step 3, primary flocculation and precipitation: feeding the slurry sieved in the step 2 into a sedimentation tank, adding a flocculating agent A with the slurry amount of 4%, and stirring at the speed of 60r/min for 15min; standing at 50 deg.C for 30min to obtain first-stage treated slurry; wherein the flocculant A is prepared in the preparation example 4;
step 4, secondary flocculation and precipitation: adding a flocculating agent B with the mud quantity of 0.4 percent into the primary treated mud, and stirring for 10min at the speed of 90 r/min; stirring for 30min to be uniform; wherein the flocculating agent B is the flocculating agent B prepared in the preparation example 6;
and 5, dehydration treatment: and (3) conveying the slurry into a belt filter press, performing filter pressing treatment through a gravity dehydration area, separating clear water and mud cakes under the tensioning air pressure of a filter belt of 0.5MPa, and collecting the separated clear water and mud cakes.
Example 3
The embodiment discloses a zero-emission underground engineering slurry treatment construction method, which is different from the embodiment 1 in that:
step 1, slurry pretreatment: collecting the slurry into a waste slurry pool, mixing and diluting the slurry and water according to the mass ratio of 1.5, adding 75g of treating agent, and mixing and stirring for 1h until the mixture is uniformly stirred; wherein the treatment fluid is the treatment fluid prepared in the preparation example 2;
step 3, primary flocculation and precipitation: feeding the slurry sieved in the step 2 into a sedimentation tank, adding a flocculating agent A with the sludge amount of 3%, and stirring at the speed of 60r/min for 15min; standing at 45 deg.C for 45min to obtain first-stage treated slurry; wherein the flocculant A is prepared in the preparation example 4;
and 4, secondary flocculation and precipitation: adding a flocculating agent B with the mud quantity of 0.3 percent into the primary treated mud, and stirring for 10min at the speed of 90 r/min; wherein the flocculant B is prepared in the preparation example 6;
and 5, dehydration treatment: and (3) conveying the slurry into a belt filter press, performing filter pressing treatment through a gravity dehydration area, separating clear water and mud cakes under the tensioning air pressure of a filter belt of 0.4MPa, and collecting the separated clear water and mud cakes.
Example 4
The embodiment discloses a zero-emission underground engineering slurry treatment construction method, which is different from the embodiment 1 in that: and 4, secondary flocculation and precipitation: flocculant B the flocculant B prepared in preparation example 7 was used.
Example 5
The embodiment discloses a zero-emission underground engineering slurry treatment construction method, which is different from the embodiment 1 in that: and 4, secondary flocculation and precipitation: flocculant B the flocculant B prepared in preparation example 8 was used.
Comparative example
Comparative example 1
A zero-emission underground engineering slurry treatment construction method is different from the embodiment 1 in that: the slurry was not pretreated.
Comparative example 2
A zero-emission underground engineering slurry treatment construction method is different from the embodiment 1 in that: the slurry was not flocculated once.
Comparative example 3
A zero-emission underground engineering slurry treatment construction method is different from that of the embodiment 1 in that: the slurry is not flocculated for the second time.
Comparative example 4
A zero-emission underground engineering slurry treatment construction method is different from the embodiment 1 in that: standing at normal temperature for 60min in step 3.
Comparative example 5
A zero-emission underground engineering slurry treatment construction method is different from the embodiment 1 in that: the chitosan in the flocculant A is replaced by the same amount of xylan.
Comparative example 6
A zero-emission underground engineering slurry treatment construction method is different from the embodiment 1 in that: flocculant B was replaced with an equal amount of a commercially available flocculant (the main component was polyacrylamide).
Performance test
1. And (3) testing the water content of the obtained mud cake: firstly, carrying out weight detection on the mud cakes obtained by pressure filtration, marking as m1, then putting the mud cakes into a drying oven, drying at the constant temperature of 120 ℃ for 6 hours, then taking out the mud cakes, and recording the weight of the dried mud cakes as m2. And (3) calculating the water content of the mud cake according to the following calculation formula: (m 1-m 2)/m 1 100%.
2. The filter-pressing dehydration efficiency of the flocculated slurry is tested: a metering barrel is communicated with a water outlet of the filter press, water pressed out by the filter press flows into the metering barrel, scale marks are arranged on the metering barrel, and time required when the water quantity in the metering barrel reaches 100g in the embodiment and the comparative example is recorded;
the water content of the sludge cakes of examples 1 to 5 and comparative examples 1 to 6 and the time required for dewatering 100g are shown in Table 1.
TABLE 1
According to the performance data of the embodiments 1-3 in the table 1, the mud cake obtained by performing mud treatment by using the construction methods of the embodiments 1-3 has lower water content and the same water yield, and the embodiments 1-3 can more quickly realize mud dewatering separation and have higher dewatering efficiency.
In comparative examples 1-3, pretreatment, primary flocculation and secondary flocculation are not carried out on the slurry respectively, the water content of the slurry in comparative example 1 is slightly influenced, the dewatering time after the slurry flocculation is prolonged, and the dewatering efficiency is reduced; the comparative examples 2 and 3 show that the water content of the slurry is high, the dewatering time of the slurry after flocculation is obviously slow, and the dewatering efficiency is low, and the data of the comparative examples 1-3 show that in the construction method, the pretreatment, the primary flocculation and the secondary flocculation of the slurry are mutually matched, the colloid cohesiveness of the slurry is firstly reduced through the pretreatment, so that the dispersion of particles in the slurry is facilitated, and then the high efficiency and the low water content of the slurry dewatering treatment are finally realized through the primary flocculation adsorption precipitation and the secondary flocculation accelerated precipitation.
The inventor analyzes that the flocculant A can keep long-term adsorption stability and is also beneficial to better play a role in secondary flocculation of the flocculant B by standing and precipitating at normal temperature in primary flocculation and slightly influencing the dehydration time and the water content of mud cakes in the comparative example 4; the adsorption effect of the flocculant A was weakened at normal temperature, and the effect of the slurry dehydration separation in examples 1 to 3 was not achieved.
The comparative example 5 replaces chitosan in the flocculant A with xylan in an equal amount, the comparative example 6 replaces the flocculant B with a commercially available flocculant in an equal amount, the comparative examples 5 and 6 replace the flocculant prepared in the application, the replaced flocculant cannot generate the synergistic effect of the flocculant in the application, and further the comparative examples 5 and 6 have longer mud dewatering time and higher mud cake water content and influence the efficiency and quality of mud dewatering work.
The inventor analyzes that the welan gum, the chitosan and the polymeric ferric aluminum silicate in the flocculant A prepared by the application are combined and compounded to form a colloid substance with a strong adsorption effect, and the colloid substance can adsorb fine particles in slurry in the process of heat preservation and standing to promote the cohesion of the fine particles so as to form a certain flocculent precipitate and realize the separation of the fine particles from water; the components in the flocculating agent B are matched to further adsorb micro particles in the slurry, so that the flocculation effect is improved; the flocculant can be re-adsorbed with formed flocculent precipitates to form larger floccules, so that the subsequent dehydration and separation are facilitated; the flocculant components are replaced, the matching relationship among the flocculant components and the flocculant is broken, the best effect cannot be exerted, and the dewatering effect of the embodiment 1-3 cannot be achieved.
In the embodiments 5 and 6, the cellulose xanthate is added into the flocculant B, and the addition of the cellulose xanthate further improves the adsorption flocculation effect of the flocculant B, so that the slurry dewatering treatment efficiency and quality of the embodiments 5 and 6 are higher.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The zero-emission underground engineering slurry treatment construction method is characterized by comprising the following steps of: the method comprises the following steps:
step 1, slurry pretreatment: collecting the slurry to a waste slurry tank, mixing and diluting the slurry and water according to the mass ratio of 1 (1-2), adding 5-10 parts by mass of treating agent, and uniformly mixing and stirring; wherein the treatment solution comprises at least 30-40% by weight of polyaspartic acid;
step 2, screening sand and stone: screening the pretreated slurry to remove impurities with large particle size in the slurry to obtain sandy soil with the particle size larger than 1 mm;
step 3, primary flocculation: feeding the slurry sieved in the step 2 into a sedimentation tank, adding a flocculating agent A accounting for 2% -4% of the slurry amount, and uniformly stirring; standing for 30-60min under heat preservation to obtain first-stage treated slurry; wherein the flocculating agent A comprises two or more of welan gum, chitosan and polymeric aluminum ferric silicate;
step 4, secondary flocculation: adding a flocculating agent B with the mud amount of 0.2-0.4% into the primary treated mud, and uniformly stirring; wherein the flocculating agent B comprises 1-3 parts by mass of polyallylamine hydrochloride, 2-4 parts by mass of cationic polyacrylamide, 10-15 parts by mass of aluminum sulfate, 5-10 parts by mass of casein and 30-35 parts by mass of water;
and 5, dehydration treatment: sending the slurry into a belt filter press for dehydration and separation, and collecting separated clear water and mud cakes;
step 6, emission treatment: the sandy soil in the step 2 is used as building pebbles and building sand or is backfilled; and (4) using the clean water in the step (5) as sand washing water and using the mud cakes as green plant walls for building adobes.
2. The zero-emission underground engineering mud treatment construction method according to claim 1, characterized in that: said treatment solution consists of polyaspartic acid 30-40% wt, triethanolamine 10-20% wt, sodium tripolyphosphate 1-3% wt and water balance.
3. The zero-emission underground engineering mud treatment construction method according to claim 1, characterized in that: the flocculant A is prepared from welan gum, chitosan, polymeric aluminum ferric silicate and water according to a mass ratio of (3-5): (1-3): 0.8:13 at 30-40 deg.C.
4. The zero-emission underground engineering mud treatment construction method according to claim 3, characterized in that: the flocculant B also comprises 0.5-0.7 parts by mass of cellulose xanthate.
5. The zero-emission underground engineering mud treatment construction method according to claim 1, characterized in that: the heat preservation temperature in the step 3 is 40-50 ℃.
6. The zero-emission underground engineering mud treatment construction method according to claim 1, characterized in that: the molecular weight of the cationic polyacrylamide is 1200-1400 ten thousand.
7. The zero-emission underground engineering mud treatment construction method according to claim 1, characterized in that: and in the step 5, the tension air pressure of the filter belt is 0.3-0.5 MPa.
8. The zero-emission underground engineering mud treatment construction method according to claim 1, characterized in that: in the step 2, the slurry is firstly sieved by a coarse sieve to remove particles larger than 5 mm; then sieving by a fine sieve to remove particles larger than 1 mm.
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