CN114212962B - Recycling process of waste mud in highway construction - Google Patents
Recycling process of waste mud in highway construction Download PDFInfo
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- CN114212962B CN114212962B CN202111361173.2A CN202111361173A CN114212962B CN 114212962 B CN114212962 B CN 114212962B CN 202111361173 A CN202111361173 A CN 202111361173A CN 114212962 B CN114212962 B CN 114212962B
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- 239000002699 waste material Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000004064 recycling Methods 0.000 title claims abstract description 45
- 238000010276 construction Methods 0.000 title claims abstract description 37
- 239000002002 slurry Substances 0.000 claims abstract description 50
- 239000010865 sewage Substances 0.000 claims abstract description 37
- 238000005189 flocculation Methods 0.000 claims abstract description 36
- 230000016615 flocculation Effects 0.000 claims abstract description 36
- 239000004576 sand Substances 0.000 claims abstract description 23
- 239000010802 sludge Substances 0.000 claims abstract description 17
- 239000007864 aqueous solution Substances 0.000 claims abstract description 14
- 230000018044 dehydration Effects 0.000 claims abstract description 14
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 14
- 238000001914 filtration Methods 0.000 claims abstract description 13
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 8
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims abstract description 7
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 7
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims abstract description 6
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims abstract description 6
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 3
- 238000001556 precipitation Methods 0.000 claims abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 26
- 238000000926 separation method Methods 0.000 claims description 14
- 239000004575 stone Substances 0.000 claims description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 239000011499 joint compound Substances 0.000 description 48
- 239000000084 colloidal system Substances 0.000 description 12
- 239000002245 particle Substances 0.000 description 12
- 238000002360 preparation method Methods 0.000 description 12
- 238000004062 sedimentation Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 6
- 239000008394 flocculating agent Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000002994 raw material Substances 0.000 description 5
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 230000001112 coagulating effect Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 229920000592 inorganic polymer Polymers 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- -1 hydrogen ions Chemical class 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Sludge (AREA)
Abstract
The application relates to the technical field of waste mud treatment, and in particular discloses a recycling process of waste mud for highway construction, which comprises the following steps: s1, recycling and filtering: obtaining sand and primary mud slurry; s2, mechanical dehydration: obtaining sludge and sewage; s3, flocculation treatment: adding an inorganic flocculant until the reaction is complete, adding an organic flocculant, and standing until the precipitation is completed to obtain an aqueous solution and a mud cake; s4, recycling: using the sand, the sludge and the mud cake as backfill materials; the addition amount of the inorganic flocculant is 15-30kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The addition amount of the organic flocculant is 10-40kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The inorganic flocculant comprises the following components in parts by weight: 15-35 parts of polyaluminum chloride, 15-30 parts of ferric chloride, 12-20 parts of polysilicate and 5-15 parts of ferric sulfate; the organic flocculant is polyacrylamide; has the effects of reducing flocculation treatment time and improving flocculation treatment recovery rate.
Description
Technical Field
The application relates to the technical field of waste mud treatment, in particular to a recycling process of waste mud in highway construction.
Background
The mud is an engineering auxiliary material, which is mainly formed by stirring clay and water, has the functions of protecting walls, cleaning holes, removing slag, cooling and the like, and is used in a large amount in the construction process of industries such as construction industry, petroleum drilling, highway construction and the like. The waste mud contains a large amount of cohesive soil, sand, broken stone, minerals, various additives and the like, has large consistency, can not be directly discharged, is difficult to naturally settle, and is a mixed substance with extremely high water content, strong fluidity and extremely low strength.
When the waste slurry is treated at present, firstly, the waste slurry is subjected to primary separation to obtain sand and slurry, and the sand and the slurry are collected and further treated; mechanically dewatering the obtained slurry to obtain sludge and sewage, collecting the sludge and further treating the sewage; when sewage is treated, flocculant is generally added into the sewage to gather suspended particles in the sewage, so as to obtain a dischargeable aqueous solution and flocculate; and finally, sand, sludge and flocculate are treated uniformly and reused. The waste mud can be reused by treating the waste mud, so that the pollution of the waste mud to the environment is reduced.
With respect to the related art, the inventors consider that the current flocculant has a long sewage treatment time and the type of flocculant used is single, resulting in incomplete recovery of some suspended particles in sewage.
Disclosure of Invention
In order to reduce flocculation treatment time and improve flocculation treatment recovery rate, the application provides a recycling process of waste slurry in highway construction.
The application provides a recycling process of waste mud in highway construction, which adopts the following technical scheme: a recycling process of waste slurry in highway construction comprises the following steps:
s1, recycling and filtering: recovering the waste slurry, standing the waste slurry, and filtering to separate sand from slurry liquid to obtain sand and primary slurry;
s2, mechanical dehydration: mechanically dehydrating the primary slurry in the step S1 to obtain sludge and sewage;
s3, flocculation treatment: after the pH value of the sewage obtained in the step S2 is regulated to 6-9, adding an inorganic flocculant until the reaction is complete, adding an organic flocculant, standing until the precipitation is completed, obtaining an aqueous solution and flocculate, and carrying out dehydration and filter pressing treatment on the flocculate to obtain a mud cake;
s4, recycling: using the sand stone, the mud residue and the mud cake obtained in the steps S1, S2 and S3 as backfill materials; the addition amount of the inorganic flocculant is 15-30kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The addition amount of the organic flocculant is 10-40kg/m 3 ；
The inorganic flocculant comprises the following components in parts by weight: 20-30 parts of polyaluminum chloride, 15-25 parts of ferric chloride, 12-20 parts of polysilicate and 8-15 parts of ferric sulfate; the organic flocculant is polyacrylamide.
By adopting the technical scheme, the waste slurry generated in highway construction is recycled, sand stone, sludge and mud cake in the waste slurry are obtained through preliminary filtration, dehydration separation and flocculation treatment, and the sand stone, the sludge and the mud cake are recycled and reused as backfill materials, so that the recycling rate of resources is improved, and meanwhile, the pollution of the waste slurry to the environment is avoided; the inorganic flocculating agents selected by the application are all inorganic polymer flocculating agents, and the flocculating agents can provide a large amount of complex ions, can strongly adsorb colloid particles, and can realize colloid condensation through adsorption, a bridge and cross-linking, and simultaneously realize physicochemical change, neutralize charges on the surfaces of the colloid particles and suspended matters, reduce delta potential, change the colloid particles from the original repulsion to the attraction, destroy the stability of the colloid groups and enable the colloid particles to collide with each other, thereby forming flocculent coagulating sedimentation and having great adsorption capacity; the finally prepared inorganic flocculant is added into the sewage through the synergistic effect among polyaluminium chloride, ferric chloride, polyaluminium silicate and ferric sulfate, so that the flocculation treatment time is shortened, and the recovery rate of the flocculation treatment is improved; the organic flocculant polyacrylamide has the characteristics of small dosage, strong flocculation capacity, easy separation of flocs, good oil removal and suspended matter removal effects and the like due to the large number of active groups and high molecular weight.
Preferably, the inorganic flocculant is added in an amount of 20-25kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The addition amount of the organic flocculant is 20-30kg/m 3 。
By adopting the technical scheme, the addition amount of the inorganic flocculant and the organic flocculant in per cubic meter of sewage is limited, and the efficiency of the sewage flocculation treatment process can be effectively improved by using the inorganic flocculant and the organic flocculant in the range.
Preferably, the inorganic flocculant comprises the following components in parts by weight: 20-30 parts of polyaluminum chloride, 15-25 parts of polyferric chloride, 12-20 parts of polysilicate and 8-15 parts of polyferric sulfate.
By adopting the technical scheme, the application ensures that the flocculated suspended particles in the flocculation treatment process have wider coverage by optimizing the consumption of each component of the inorganic flocculant, thereby effectively reducing the content of COD, BOD and SS in the water solution after sewage treatment and ensuring that the finally treated water solution reaches the first-level standard of sewage discharge.
Preferably, the inorganic flocculant further comprises 5-10 parts of diatomite.
By adopting the technical scheme, the diatomite is added into the sewage to quickly form stable massive flocculates, which is an important link of solid-liquid separation of the sewage, so that the sewage treatment cost is reduced, and the solid-liquid separation efficiency of the sewage can be improved.
Preferably, in S1, the waste slurry is filtered through a 40-60 mesh filter screen.
Through adopting above-mentioned technical scheme, all be provided with 60 mesh filter screens in elementary mud thick liquid export, can filter out the great grit of granule in the waste mud through twice filtration to can fully retrieve and recycle.
Preferably, the mechanical drying method in S2 is a centrifugal separation method or an extrusion drying method.
By adopting the technical scheme, the sludge and the sewage can be effectively separated by using a centrifugal separation method or an extrusion dehydration method, so that the sludge is recycled, and the sewage can be further recycled.
Preferably, the pH value is adjusted in S3 by hydrochloric acid and sodium hydroxide.
By adopting the technical scheme, the pH value has great influence on flocculant operation, so that the flocculation treatment is carried out by paying attention to the effective pH value range. The organic polymeric flocculant has less strict limit on the pH value, but has larger influence on the flocculation effect of the flocculant when the pH value is smaller; the inorganic flocculant is sensitive to the pH value, and the hydrolysis reaction of the flocculant is kept fully carried out because hydrogen ions are continuously generated in the hydrolysis reaction of the flocculant; after the pH value is regulated to 6-9, inorganic flocculant and organic flocculant are added into the sewage to treat the sewage so as to obtain flocculate.
Preferably, in the step S1, the step of standing the waste mud for a preset time is as follows: when the total volume of the waste slurry is less than or equal to 30m 3 While standing for at least 1 day; when the total volume of the waste slurry is more than 30m 3 And < 50m 3 While standing for at least 1.5 days; when the total volume of the waste slurry is more than or equal to 50m 3 While standing for at least 2 days.
Through adopting above-mentioned technical scheme, the total volume according to the waste mud confirms to stand for the preset time, has guaranteed that the waste mud that produces at every turn can both let the abundant sediment of grit wherein, guarantees that the grit separates out smoothly, has guaranteed going on smoothly of follow-up technology when having improved the rate of recovery of grit.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the application recycles the waste mud generated in highway construction, and obtains sand stone, mud residue and mud cake in the waste mud through preliminary filtration, dehydration separation and flocculation treatment, and recycles the sand stone, mud residue and mud cake to be used as backfill materials, thereby improving the recycling rate of resources and avoiding the pollution of the waste mud to the environment; the inorganic flocculating agents selected by the application are all inorganic polymer flocculating agents, and the flocculating agents can provide a large amount of complex ions, can strongly adsorb colloid particles, and can realize colloid condensation through adsorption, a bridge and cross-linking, and simultaneously realize physicochemical change, neutralize charges on the surfaces of the colloid particles and suspended matters, reduce delta potential, change the colloid particles from the original repulsion to the attraction, destroy the stability of the colloid groups and enable the colloid particles to collide with each other, thereby forming flocculent coagulating sedimentation and having great adsorption capacity; the finally prepared inorganic flocculant is added into the sewage through the synergistic effect among polyaluminium chloride, ferric chloride, polyaluminium silicate and ferric sulfate, so that the flocculation treatment time is shortened, and the recovery rate of the flocculation treatment is improved; the organic flocculant polyacrylamide has the characteristics of small dosage, strong flocculation capacity, easy separation of flocs, good oil removal and suspended matter removal effects and the like due to the large number of active groups and high molecular weight.
2. According to the application, diatomite is added into sewage to quickly form stable massive flocculate, which is an important link of sewage solid-liquid separation, so that the sewage treatment cost is reduced, and the sewage solid-liquid separation efficiency is improved.
3. In the recycling process of the waste slurry for highway construction, the water solution and the flocculate obtained by observing the flocculation treatment process and detecting the flocculation treatment are detected, wherein the lowest values of COB, BOD and SS in the water solution can respectively reach 30mg/L, 9mg/L and 32mg/L; the flocculation time is 5min at the shortest.
Detailed Description
The present application will be described in further detail with reference to examples.
Preparation example
Preparation examples 1 to 4
An inorganic flocculant of preparation examples 1-4, the raw materials and the amounts of the raw materials are shown in Table 1, and the preparation steps are as follows:
the raw materials were weighed according to the amounts shown in Table 1, and then stirred uniformly to obtain an inorganic flocculant.
TABLE 1 inorganic flocculant preparation examples 1-4 raw materials and raw material amounts (kg)
| Preparation example 1 | Preparation example 2 | Preparation example 3 | Preparation example 4 | |
| Polyaluminum chloride | 15 | 20 | 30 | 35 |
| Poly (ferric chloride) | 30 | 25 | 20 | 15 |
| Polysilicate aluminum | 12 | 15 | 18 | 20 |
| Poly ferric sulfate | 15 | 12 | 8 | 5 |
Examples
Example 1
A recycling process of waste slurry in highway construction comprises the following steps:
s1: and (3) recycling and filtering: recycling waste mud to a sedimentation tank through an inlet of the sedimentation tank, standing, and calculating the volume of the waste mud according to the height of the collected waste mud in the recycling tank, wherein the total volume of the waste mud is less than or equal to 30m 3 Standing for 1 day; setting a 60-mesh filter screen at a primary slurry outlet, opening a screening valve of the filter screen in a sedimentation tank during filtration to separate sand and stone precipitated in a natural sedimentation process from slurry, removing sand and stone with the particle size of more than 60 meshes in waste slurry, recovering sand and stone remained on the filter screen, and enabling the slurry to flow out from the primary slurry outlet to obtain primary slurry;
s2, mechanical dehydration: transferring the primary slurry in the step S1 into a dehydration device, and mechanically dehydrating in the dehydration device by using a centrifugal separation method to obtain sludge and sewage;
s3, flocculation treatment: introducing the sewage obtained in the step S2 into a first sedimentation tank, regulating the pH value by hydrochloric acid or sodium hydroxide, adding an inorganic flocculant when the pH value is regulated to 7, filling the whole sedimentation tank with flocculate, obviously separating solid from liquid, clearing the sewage, adding an organic flocculant, standing until sedimentation is completed, taking a small amount of upper aqueous solution into a test tube, adding a polyacrylamide flocculant, and not generating flocculate, namely obtaining aqueous solution and flocculate, transferring the flocculate into a dehydration device for dehydration, and performing filter pressing treatment to form mud cakes;
s4, recycling: and (3) recycling the sand stone, the sludge and the mud cake obtained in the steps S1, S2 and S3 to be used as backfill materials.
Wherein the inorganic flocculant is from preparation example 1, and the addition amount of the inorganic flocculant is 15kg/m 3 The addition amount of the organic flocculant is 40kg/m 3 。
Example 2
The recycling process of the waste slurry for highway construction is different from that in the embodiment 1 in that the inorganic flocculant added in the S3 is prepared in the embodiment 2, and the rest steps are the same as those in the embodiment 1.
Example 3
The recycling process of the waste slurry for highway construction is different from that in the embodiment 1 in that the inorganic flocculant added in the S3 is prepared in the embodiment 3, and the rest steps are the same as those in the embodiment 1.
Example 4
The recycling process of the waste slurry for highway construction is different from that in the embodiment 1 in that the inorganic flocculant added in the S3 is prepared in the embodiment 4, and the rest steps are the same as those in the embodiment 1.
Example 5
A recycling process of waste road construction slurry is different from example 3 in that the inorganic flocculant further comprises 5 parts
The remainder of the procedure was the same as in example 1.
Example 6
A recycling process of waste road construction slurry is different from example 3 in that the inorganic flocculant further comprises 10 parts
The remainder of the procedure was the same as in example 1.
Example 7
A recycling process of waste road construction mud is different from example 6 in that the addition amount of the inorganic flocculant is 20kg/m 3 The addition amount of the organic flocculant is 30kg/m 3 。
Example 8
A recycling process of waste road construction mud is different from example 6 in that the addition amount of the inorganic flocculant is 25kg/m 3 The addition amount of the organic flocculant is 20kg/m 3 。
Example 9
A recycling process of waste road construction mud is different from example 6 in that the addition amount of inorganic flocculant is 30kg/m 3 The addition amount of the organic flocculant is 10kg/m 3 。
Example 10
A recycling process of waste mud for highway construction is different from example 6 in that the total volume of waste mud recovered in S1 is more than 30m 3 And < 50m 3 When left standing for 1.5 days, the rest of the procedure was the same as in example 3.
Example 11
A recycling process of waste mud for highway construction is different from example 6 in that the total volume of the waste mud recycled in S1 is more than or equal to 50m 3 When left standing for 2 days, the rest of the procedure was the same as in example 3.
Comparative example
Comparative example 1
The recycling process of the waste slurry for highway construction is different from that in the embodiment 9 in that the addition amount of polyaluminum chloride in the inorganic flocculant is 0, and the rest steps are the same as those in the embodiment 9.
Comparative example 2
The recycling process of the waste slurry for highway construction is different from that in the embodiment 9 in that the addition amount of the poly ferric chloride in the inorganic flocculant is 0, and the rest steps are the same as those in the embodiment 9.
Comparative example 3
The recycling process of the waste slurry for highway construction is different from that in the embodiment 9 in that the addition amount of the aluminum polysilicate in the inorganic flocculant is 0, and the rest steps are the same as those in the embodiment 9.
Comparative example 4
The recycling process of the waste slurry for highway construction is different from that in the embodiment 9 in that the addition amount of the ferric polysulfate in the inorganic flocculant is 0, and the rest steps are the same as those in the embodiment 9.
Performance test
Detection method/test method
The aqueous solutions and flocs obtained by flocculation treatment in the recycling process of the waste road construction slurry used in examples 1 to 11 and comparative examples 1 to 4 were examined according to the following examination methods, and the examination results are shown in table 2.
And (3) flocculation time detection: starting timing from the addition of flocculant to the point where flocs no longer produce end timing.
And (3) mud cake weight detection: the mud cake weight obtained after the flocculation treatment of the same batch of sewage is detected, and the larger the numerical value of the test result is, the better the flocculation effect is.
And (3) detecting an aqueous solution: the aqueous solution after flocculation treatment was tested according to GB8978-1996 Integrated wastewater discharge Standard.
TABLE 2 flocculation treatment test results for examples 1-11 and comparative examples 1-4
And recycling the waste slurry generated in highway construction, obtaining sand stone, sludge and mud cake in the waste slurry through preliminary filtration, dehydration separation and flocculation treatment, recycling the sand stone, the sludge and the mud cake, and using the recycled sand stone, the sludge and the mud cake as backfill materials, wherein the obtained aqueous solution reaches the comprehensive primary standard of sewage discharge.
As can be seen from the detection data of examples 1 to 4, the inorganic flocculant of preparation example 3 has a relatively high proportion, and the inorganic flocculant of preparation example 3 is applied to S2 of the recovery process of the waste mud for highway construction, and has short flocculation time and high weight of the obtained mud cake. As can be seen by combining the detection data of examples 5-6, the addition of diatomite to the inorganic flocculant can effectively improve the flocculation capacity to sewage, and the content of COB, BOD and SS in the aqueous solution is reduced.
As can be seen from the examination data of examples 7 to 9, when the inorganic flocculant is added in an amount of 15kg/m 3 The addition amount of the organic flocculant is 40kg/m 3 When the sewage is subjected to flocculation treatment completely, the content of COB, BOD and SS in the obtained aqueous solution is low, the flocculation time is short, and the weight of mud cakes is large. And by combining the detection data of the embodiments 10-11, it can be seen that the preset standing time is based on the total volume of the waste mud, the COB, BOD and SS contents in the aqueous solution are low, and the flocculation time is short.
As can be seen from the examination data of examples 1 to 11 and comparative examples 1 to 4, when one of the added amounts of polyaluminium chloride, polyaluminium silicate and polyaluminium sulfate in the inorganic flocculant is 0, the weight of the sludge cake obtained after the flocculation treatment is small and the contents of COB, BOD and SS in the aqueous solution are high, which means that polyaluminium chloride, polyaluminium silicate and polyaluminium sulfate have a synergistic effect.
The foregoing embodiments are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (6)
1. A recycling process of waste slurry in highway construction is characterized in that: the method comprises the following steps:
s1, recycling and filtering: recovering the waste slurry, standing the waste slurry, and filtering to separate sand from slurry liquid to obtain sand and primary slurry;
s2, mechanical dehydration: mechanically dehydrating the primary slurry in the step S1 to obtain sludge and sewage;
s3, flocculation treatment: after the pH value of the sewage obtained in the step S2 is regulated to 7, adding an inorganic flocculant until the reaction is complete, adding an organic flocculant, standing until the precipitation is completed, obtaining an aqueous solution and flocculate, and carrying out dehydration and filter pressing treatment on the flocculate to obtain a mud cake;
s4, recycling: using the sand stone, the mud residue and the mud cake obtained in the steps S1, S2 and S3 as backfill materials;
the addition amount of the inorganic flocculant is 15kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The addition amount of the organic flocculant is 40kg/m 3 ；
The inorganic flocculant comprises the following components in parts by weight: 30 parts of polyaluminum chloride, 20 parts of ferric chloride, 18 parts of polysilicate aluminum and 8 parts of ferric sulfate; the organic flocculant is polyacrylamide.
2. The recycling process of waste road construction mud according to claim 1, wherein: the inorganic flocculant also comprises 5-10 parts of diatomite.
3. The recycling process of waste road construction mud according to claim 1, wherein: and in the step S1, filtering the waste mud through a filtering screen with 40-60 meshes.
4. The recycling process of waste road construction mud according to claim 1, wherein: the mechanical drying method in the step S2 is a centrifugal separation method or an extrusion drying method.
5. The recycling process of waste road construction mud according to claim 1, wherein: in the step S3, the pH value is adjusted by hydrochloric acid or sodium hydroxide.
6. The recycling process of waste road construction mud according to claim 1, wherein: in the step S1, the step of standing the waste mud for a preset time is as follows: when the total volume of the waste slurry is less than or equal to 30m 3 While standing for at least 1 day; when the total volume of the waste slurry is more than 30m 3 And < 50m 3 While standing for at least 1.5 days; when the total volume of the waste slurry is more than or equal to 50m 3 While standing for at least 2 days.
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| US20160244349A1 (en) * | 2015-02-11 | 2016-08-25 | Gradiant Corporation | Production of ultra-high-density brines |
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| US20160244349A1 (en) * | 2015-02-11 | 2016-08-25 | Gradiant Corporation | Production of ultra-high-density brines |
| CN109384276A (en) * | 2018-10-22 | 2019-02-26 | 鞍山市鑫诚水处理有限公司 | A kind of efficient decolorizing, decyanation, the COD that degrades Waste water treatment medicament |
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