CN110577349A - Building slurry treatment process and application - Google Patents
Building slurry treatment process and application Download PDFInfo
- Publication number
- CN110577349A CN110577349A CN201911012737.4A CN201911012737A CN110577349A CN 110577349 A CN110577349 A CN 110577349A CN 201911012737 A CN201911012737 A CN 201911012737A CN 110577349 A CN110577349 A CN 110577349A
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- slurry
- treatment process
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- ferrite
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
-
- 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
-
- 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
-
- 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
-
- 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
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Ceramic Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a building slurry treatment process, which comprises the following steps: 1) adding chemicals for tempering, including primary flocculation and secondary flocculation; 2) the invention firstly utilizes the characteristic that dry enteromorpha is dissolved and then is colloidal to adsorb micro particles in the slurry, and simultaneously the colloidal characteristic of the enteromorpha solution effectively avoids the phenomenon that ferrite particles are copolymerized, thereby the ferrite is dispersed more uniformly, and then flocculation is carried out through an inorganic flocculant aluminum sulfate, the ferrite is agglutinated through the cross-linking action of aluminum multivalent ions, the crosslinked solid flotage gathers magnetic powder, the cationic polyacrylamide bridges and adsorbs the crosslinked solid flotage and the particles in the slurry, and then a larger high-specific gravity flotage is formed through magnetic dragging, thereby further promoting solid-liquid separation and providing specific application thereof.
Description
Technical Field
The invention relates to a building slurry treatment process and application.
Background
The building slurry is slurry produced in the construction of pile foundation and foundation pit. The building slurry is a mixture of a soil body after drilling and cutting and a water body for lubricating a drill bit and reducing the temperature of the drill bit, and the solid phase components of the building slurry are different due to different drilling soil body components. The building slurry is difficult to precipitate due to large fluidity and high water content, and cannot be stored in a construction site, so that the building slurry needs to be further processed. At present, the treatment mode is mainly that the materials are directly dumped by being pulled to a dumping ground by a tanker. The dumping is a waste pond, a mud flat or a suburban storage site, some ponds even directly dump to offshore seabed, the environment is easy to damage, including blocking pipelines and riverways, earth surface plants covered by mud cannot grow, the ponds filled with mud cannot be built in engineering or loaded to pass, pollutants such as heavy metals accumulate, and the mud-rock flow disasters are caused by long-term dumping, so that the direct dumping is a harmful treatment mode and needs to be improved.
Disclosure of Invention
In view of the above, the present invention provides a construction slurry treatment process and application thereof, so as to solve the above problems.
In a first aspect, the present invention provides a construction mud treatment process comprising the steps of:
1) Modifying by adding medicine
Primary flocculation: introducing the screened slurry into a triple reactor, adding dry enteromorpha powder accounting for 2-5% of the slurry by mass, and stirring;
Secondary flocculation: adding a compound coagulant which comprises cationic polyacrylamide, aluminum sulfate and ferrite and accounts for 1-3 per mill of the mass of the slurry, stirring and standing;
2) drying dehydration
And pumping out supernatant in the triple reactor, pumping out bottom layer slurry, filter pressing and drying.
The method comprises the steps of firstly utilizing the characteristic that dry enteromorpha is dissolved and then is colloidal, firstly adsorbing tiny particles in slurry, and simultaneously effectively avoiding the phenomenon that ferrite particles are copolymerized due to the colloidal characteristic of an enteromorpha solution, so that ferrite is dispersed more uniformly, then flocculating the ferrite by using an inorganic flocculating agent aluminum sulfate, agglutinating the ferrite by using the cross-linking effect of aluminum multivalent ions, collecting magnetic powder from solid floaters after cross-linking, bridging cationic polyacrylamide, adsorbing, sweeping and cross-linking the solid floaters and the particles in the slurry, and then forming larger high-specific gravity floaters by using magnetic force to further promote solid-liquid separation.
After the treatment by the process, the bottom layer slurry in the triple reactor only needs to be simply subjected to filter pressing, the water content in the sludge can be lower than 30%, after airing and drying, the water content is lower than 10%, mud-water separation is realized, and the supernatant in the triple reactor passes through the water quality standard of urban miscellaneous water, so that the triple reactor can be used as living miscellaneous water for landscaping, road flushing, toilet flushing in a plant area and the like.
in addition, the enteromorpha is adopted as a raw material of the treatment method, so that the full utilization of the enteromorpha is realized, and the environmental protection requirement is met.
And further, screening the slurry in the primary flocculation, conveying the slurry to a vibrating screen for screening, and separating coarse sand, medium sand and fine sand in sequence.
further, the molecular weight of the cationic polyacrylamide is 1200-1800 ten thousand.
More preferably, the compound coagulant comprises 1-3 parts of cationic polyacrylamide, 15-19 parts of aluminum sulfate and 1-3 parts of ferrite.
Further, the compound coagulant also comprises a chelating accelerator accounting for 0.2-0.4 per mill of the amount of the slurry, and the components comprise 5-20 parts of iron powder, 5-20 parts of sodium thiosulfate, 1-5 parts of chitin and 5-20 parts of citric acid by mass.
Aiming at different construction sites, the building slurry contains excessive harmful substances, oil, heavy metals and the like, and a chelating accelerator is added to remove the harmful substances.
Further, the stirring rate: 300r/min, thereby avoiding the flocculating constituents from being damaged in a large range and influencing the solid-liquid separation effect.
further, the water content of the enteromorpha is lower than 20%, the enteromorpha is dried in a preferable drying mode until the water content is lower than 20%, and then the enteromorpha is inactivated and crushed to about 30 meshes.
The invention also aims to provide application of the slurry containing the chelating accelerant after flocculation in brick making, which is characterized in that the sludge after filter pressing and drying is mixed with a curing agent, wherein the curing agent comprises stone powder, sand-coated soil, fly ash and cement, and the mixture is uniformly stirred and pressed for forming.
further, the curing agent comprises 3-4% of hydrated lime, 32-36% of stone powder, 30-32% of sand-coated soil, 17-20% of fly ash and 16-20% of cement.
The sludge treated by the method is mixed with the curing agent and then pressed into bricks, so that the resource utilization of the sludge is realized, and the environment-friendly concept is met.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in connection with the examples to make the technical solutions of the present invention easier to understand and master.
First, treating the slurry
Experiment 1, a building slurry treatment process, comprising the following steps:
1) Preparing dry Enteromorpha prolifera powder, drying Enteromorpha prolifera by drying until the water content is lower than 20%, inactivating, and pulverizing to about 30 meshes.
2) Modifying by adding medicine
Primary flocculation: conveying the slurry generated in the construction site to a vibrating screen for screening, separating coarse sand, medium sand and fine sand in sequence, conveying the screened slurry into a sludge storage tank, enabling the pH of the supernatant of the sludge storage tank to be 8.2, sampling and detecting, conveying the slurry into a triple reactor through a lifting pump, adding dry enteromorpha powder with the slurry amount of 2% by mass, and stirring for 10 min;
Secondary flocculation: adding a compound coagulant with the mud amount of 1 per mill by mass, wherein the compound coagulant comprises the following components: 1-3 parts of cationic polyacrylamide with the molecular weight of 1200 ten thousand, 15 parts of aluminum sulfate and 1 part of ferrite, wherein the ferrite is nano particles, the stirring speed is 300r/min, the time is 20min, the mixture is kept stand for 5min, and supernatant liquid is extracted for detection;
2) Drying dehydration
and (3) extracting supernatant in the triple reactor, extracting and filter-pressing bottom layer slurry, wherein the filter-pressing pressure is 0.3Mpa, sampling, detecting, drying, crushing, and airing at normal temperature for 1h in sunny days.
Compared with the test 1, the difference between the test 2 and the test 1 is that the adding amount of the dry enteromorpha powder in the primary flocculation procedure is 5 percent of the amount of the mud, the compound coagulant is 3 per mill of the amount of the mud, and the components of the compound coagulant are as follows: 3 parts of cationic polyacrylamide with the molecular weight of 1200 ten thousand, 19 parts of aluminum sulfate and 3 parts of ferrite.
Test 3, compared with example 1, the difference lies in that the addition amount of the dry enteromorpha powder in the first flocculation process is 4% of the amount of the mud, the compound coagulant is 2% o of the amount of the mud, and the compound coagulant comprises the following components: 2 parts of cationic polyacrylamide with the molecular weight of 1200 ten thousand, 17 parts of aluminum sulfate and 2 parts of ferrite.
Test 4, compared with example 1, the chelating accelerant accounting for 0.2 per mill of the amount of the mud, the cationic polyacrylamide, 15 parts of aluminum sulfate, 1 part of ferrite accounting for 0.8 per mill of the amount of the mud, the compound coagulant accounting for 1 per mill of the amount of the mud are added into the compound coagulant, the components of the chelating accelerant comprise 5 parts of iron powder, 5 parts of sodium thiosulfate, 1 part of chitin and 5 parts of citric acid, and secondary flocculation supernatant and filter-pressed mud blocks are sampled according to mass.
experiment 5, compared with example 2, the chelating accelerant which accounts for 0.4 per mill of the amount of the mud is added into the composite coagulant, the components comprise 20 parts of iron powder, 20 parts of sodium thiosulfate, 5 parts of chitin and 20 parts of citric acid, and secondary flocculation supernatant and filter-pressed mud blocks are sampled according to mass.
Test 6, compared with example 3, the chelating accelerant which accounts for 0.3 per mill of the amount of the mud is added into the composite coagulant, the components comprise 10 parts of iron powder, 12 parts of sodium thiosulfate, 3 parts of chitin and 10 parts of citric acid, and secondary flocculation supernatant and filter-pressed mud blocks are sampled according to mass.
Second, detecting the sample
TABLE 1
TABLE 2
TABLE 3
Table 4: mud block detection result table
According to the test examples and the test tables, it can be seen that:
1. When no chelating accelerant is added, after the treatment by the process, solid-liquid separation is carried out quickly, the water content in the sludge can be lower than 30%, and after airing and drying, the water content is lower than 10%, so that mud-water separation is realized, but due to the construction problem of a construction site, harmful substances such as heavy metals and the like are contained, and mud and supernatant liquid need to be transported out for further treatment.
2. After the chelating accelerant is added, the mud and the water are quickly separated, the supernatant after secondary flocculation and the mud block after filter pressing both meet the environmental protection requirement, wherein the supernatant after secondary flocculation can be used as domestic miscellaneous water for landscaping, road flushing, flushing in plant areas and the like through the water quality standard of urban miscellaneous water, and the mud block after filter pressing meets the soil pollution risk control standard for soil environment quality construction land.
Example 2 the slurries prepared in test examples 4 to 6 were used to make bricks, specifically: mixing the dried sludge after filter pressing with a curing agent, wherein the curing agent comprises stone powder, sand-coated soil, fly ash and cement, uniformly stirring, adding water, and performing compression molding.
The curing agent comprises 3% of hydrated lime, 32% of stone powder, 30% of sand-coated soil, 17% of fly ash and 16% of cement.
Or 4% of hydrated lime, 36% of stone powder, 32% of sand-coated soil, 20% of fly ash and 20% of cement.
Through detection, the prepared bricks meet the strength required by buildings, realize resource utilization of sludge and meet the environmental protection concept.
The above is, of course, only a specific application example of the present invention, and the scope of the present invention is not limited in any way. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.
Claims (9)
1. The building slurry treatment process is characterized by comprising the following steps of:
1) modifying by adding medicine
Primary flocculation: introducing the screened slurry into a triple reactor, adding dry enteromorpha powder accounting for 2-5% of the slurry by mass, and stirring;
Secondary flocculation: adding a compound coagulant which comprises cationic polyacrylamide, aluminum sulfate and ferrite and accounts for 1-3 per mill of the mass of the slurry, and stirring;
2) Drying dehydration
And pumping out supernatant in the triple reactor, pumping out bottom layer slurry, filter pressing and drying.
2. the building mud treatment process of claim 1, wherein the screening of the primary flocculation middlings is carried out, the mud is conveyed to a vibrating screen for screening, and coarse sand, middlings and fine sand are sequentially separated.
3. The construction mud treatment process of claim 1, wherein the cationic polyacrylamide has a molecular weight of from 1200 to 1800 ten thousand.
4. The building slurry treatment process according to claim 3, wherein the compound coagulant comprises 1-3 parts of cationic polyacrylamide, 15-19 parts of aluminum sulfate and 1-3 parts of ferrite by mass.
5. The building mud treatment process of claim 1, wherein the water content of the enteromorpha is less than 20%.
6. The construction mud treatment process of claim 1, wherein the agitation rate is: 300 r/min.
7. The building slurry treatment process according to claim 1, wherein the compound coagulant further comprises a chelating accelerator accounting for 0.2-0.4 per mill of the slurry amount, and the components comprise 5-20 parts by mass of iron powder, 5-20 parts by mass of sodium thiosulfate, 1-5 parts by mass of chitin and 5-20 parts by mass of citric acid.
8. The application of the slurry prepared by the construction slurry treatment process in brick making according to claim 7, wherein the sludge after filter pressing and drying is mixed with a curing agent, the curing agent comprises stone powder, sand-coated soil, fly ash and cement, the mixture is uniformly stirred and is pressed and molded.
9. The use according to claim 8, wherein the curing agent comprises, by mass, 3-4% of hydrated lime, 32-36% of stone powder, 30-32% of sand-coated soil, 17-20% of fly ash, and 16-20% of cement.
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| CN201911012737.4A CN110577349A (en) | 2019-10-23 | 2019-10-23 | Building slurry treatment process and application |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111268980A (en) * | 2020-02-26 | 2020-06-12 | 浙江华恒交通建设监理有限公司 | Method for using machine-made sand stone powder and lime composite building waste slurry as road filler |
| CN111533428A (en) * | 2020-04-29 | 2020-08-14 | 杭州天和建设集团有限公司 | Construction method for curing building slurry |
| CN111675483A (en) * | 2020-06-24 | 2020-09-18 | 深圳大学 | Slurry flocculation curing agent and preparation method and application thereof |
| CN115159811A (en) * | 2022-06-23 | 2022-10-11 | 肇庆市建筑工程有限公司 | Zero-emission underground engineering slurry treatment construction method |
| CN115159811B (en) * | 2022-06-23 | 2024-06-11 | 肇庆市建筑工程有限公司 | Zero-emission underground engineering slurry treatment construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111268980A (en) * | 2020-02-26 | 2020-06-12 | 浙江华恒交通建设监理有限公司 | Method for using machine-made sand stone powder and lime composite building waste slurry as road filler |
| CN111533428A (en) * | 2020-04-29 | 2020-08-14 | 杭州天和建设集团有限公司 | Construction method for curing building slurry |
| CN111675483A (en) * | 2020-06-24 | 2020-09-18 | 深圳大学 | Slurry flocculation curing agent and preparation method and application thereof |
| CN115159811A (en) * | 2022-06-23 | 2022-10-11 | 肇庆市建筑工程有限公司 | Zero-emission underground engineering slurry treatment construction method |
| CN115159811B (en) * | 2022-06-23 | 2024-06-11 | 肇庆市建筑工程有限公司 | Zero-emission underground engineering slurry treatment construction method |
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