CN110759613A - Recycling process of waste slurry for highway construction - Google Patents
Recycling process of waste slurry for highway construction Download PDFInfo
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- CN110759613A CN110759613A CN201911001543.4A CN201911001543A CN110759613A CN 110759613 A CN110759613 A CN 110759613A CN 201911001543 A CN201911001543 A CN 201911001543A CN 110759613 A CN110759613 A CN 110759613A
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- slurry
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- dewatering
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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
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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
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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
- C02F11/12—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
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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
- C02F11/12—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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (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)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a recycling process of waste slurry for highway construction, which comprises the steps of primary filtering, mechanical dewatering, precipitation separation, stirring mixing, curing molding and the like, can separate mud and water in the waste slurry, can recycle and reuse water, and simultaneously carries out molding and curing on the separated mud to prepare usable products, can completely treat and digest the slurry on a construction site through the implementation of the process, solves the problems of slurry accumulation and difficult transportation, avoids the pollution of the waste slurry to the environment, changes waste into valuables at the same time, has commercial profit value, has short curing process time and high efficiency for the slurry in the process, and only needs about 1-2 hours from the first step of slurry filtering to pressing molding, the period for treating the slurry is short, the operation efficiency is high, and the problem of occupied land due to slurry accumulation can be solved through the efficient treatment process.
Description
Technical Field
The invention relates to the field of slurry treatment, in particular to a recycling process of waste slurry for highway construction.
Background
The slurry is an engineering auxiliary material, mainly comprises a semifluid mixture of bentonite or clay and water, and is widely used in the construction process of industries such as the building industry, petroleum drilling, highway construction and the like. The slurry has the functions of wall protection, hole cleaning, slag discharge, cooling and the like, can effectively inhibit the ejection and the gushing of underground water in the stratum, ensures the smooth construction, and is widely applied in engineering. The 21 st century is a growing era, and various project engineering is fiercely developed and road construction is also true. By the end of 2017, the total highway mileage in China reaches 477.35 kilometers, and the highway mileage of two or more grades reaches 62.22 kilometers, so that a large amount of waste slurry is generated along the highway construction. 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. Because the usable area of the building site is limited, if the construction site is not treated in time, the construction is influenced, and environmental pollution, water quality pollution and other public hazards can be caused. Therefore, the treatment of a large amount of waste mud is always a difficult problem for engineering construction, and especially the waste mud generated in the pile foundation of the highway bridge is especially obvious due to the limitation of factors such as terrain, field, expense, technology and the like.
Therefore, it is urgently needed to develop an economic and environment-friendly waste slurry treatment process, which can not only solve the slurry environmental pollution problem of the slurry for highway construction, but also better save resources and realize secondary recycling of the resources.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a process for recycling waste slurry generated in the highway construction process, which can recycle the waste slurry generated in the highway construction process and realize resource recycling, thereby solving the problem of environmental pollution caused by the slurry and saving resources.
The purpose of the invention is realized by the following technical scheme:
a recycling process of waste slurry for highway construction comprises the following steps:
s1, primary filtration: filtering the waste slurry through filtering equipment to obtain filter residues of large-particle-size solid particles and slurry filtrate, and conveying the obtained filter residues to mixing equipment for later use;
s2, mechanical dehydration: transferring the slurry filtrate obtained in the step S1 into dewatering equipment for mechanical dewatering to obtain sludge and sewage, and sending the obtained sludge to mixing equipment for later use;
s3, precipitation separation: conveying the sewage obtained in the step S2 to a sedimentation tank, adding a flocculating agent, standing for layering to obtain a supernatant and a precipitate, and transferring the precipitate to dewatering equipment for dewatering;
s4, stirring and mixing: adding a curing agent into mixing equipment containing the filter residue obtained in the step S1 and the sludge obtained in the step S2, and stirring and mixing to obtain a sludge material;
s5, curing and forming: and (5) filling the pug obtained in the step (S4) into a die, pressing, forming, demolding, transferring into a curing box, and curing to obtain a pug product.
In step S3, the method specifically includes the following steps:
s31, conveying the sewage into a primary sedimentation tank, adding a flocculating agent, standing and layering to obtain primary supernatant and primary sediment;
s32, transferring the primary supernatant obtained in the step S31 to a secondary sedimentation tank, adding a flocculating agent, standing and layering to obtain a secondary supernatant and a secondary precipitate;
s33, transferring the secondary supernatant obtained in the step S32 to a tertiary sedimentation tank, adding a flocculating agent, standing and layering to obtain a tertiary supernatant and a tertiary precipitate, wherein the tertiary supernatant can be used as engineering water, and transferring the primary precipitate, the secondary precipitate and the tertiary precipitate obtained in the steps S31-S33 to dewatering equipment for dewatering.
In step S4, adding crushed stone and additives into the stirring equipment during the stirring process, wherein the additives include one or a combination of curing agent, water reducing agent and early strength agent.
In step S2, before transferring the slurry filtrate to the dewatering equipment, sampling from the slurry filtrate for performance detection, and determining whether an additive needs to be added for performance adjustment according to the detection result, so that the slurry filtrate meets the requirements of the dewatering equipment; and (4) preparing the slurry filtrate to meet the working requirement of the dewatering equipment, and then adding the slurry filtrate into the dewatering equipment.
Further, in step S2, the performance test performed on the slurry filtrate includes three performances, i.e., viscosity, specific gravity, and rheology.
In step S5, the curing box is a multi-layer curing box, and an air blowing device and a heating device are disposed in a curing chamber in which the curing box is placed, and the air blowing device and the heating device are turned on to accelerate curing during curing.
Further, the set temperature in the curing chamber is 60-80 ℃.
The invention has the following beneficial effects:
1. the invention provides a recycling process of waste slurry generated in road construction, which can realize the dehydration, separation, solidification and molding recycling of the waste slurry generated in road construction, and simultaneously treat and apply the separated wastewater, thereby saving resources;
2. in the process, the time of the mud material curing process is short, the efficiency is high, the whole mud treatment process is continuous operation of a production line, only about 1-2 hours are needed from the mud filtration to the compression molding in the first step, the mud treatment period is short, the operation efficiency is high, and the problem of occupied land due to mud accumulation can be solved through a high-efficiency treatment process;
3. the process almost realizes 100% recycling of water and slurry in the waste slurry, accords with national green development and sustainable development policies, changes waste into valuable, and realizes resource recycling.
Drawings
FIG. 1 is a process flow diagram of the recycling process of the waste slurry for highway construction of the invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are given in the accompanying drawings.
A recycling process of waste slurry for highway construction comprises the following steps:
s1, primary filtration: filtering the waste slurry through filtering equipment to obtain filter residues of large-particle-size solid particles and slurry filtrate, and conveying the obtained filter residues to mixing equipment for later use;
s2, mechanical dehydration: transferring the slurry filtrate obtained in the step S1 into dewatering equipment for mechanical dewatering to obtain sludge and sewage, and sending the obtained sludge to mixing equipment for later use; wherein, the mechanical dehydration mode can adopt one or two of centrifugal dehydration or filter-pressing dehydration;
s3, precipitation separation: conveying the sewage obtained in the step S2 to a sedimentation tank, adding a flocculating agent, standing for layering to obtain a supernatant and a precipitate, and transferring the precipitate to dewatering equipment for dewatering;
s4, stirring and mixing: adding a curing agent into mixing equipment containing the filter residue obtained in the step S1 and the sludge obtained in the step S2, and stirring and mixing to obtain a sludge material;
s5, curing and forming: and (5) filling the pug obtained in the step (S4) into a die, pressing, forming, demolding, transferring into a curing box, and curing to obtain a pug product.
The recycling process provided by the invention can realize the dehydration separation, solidification and molding reutilization of the waste slurry generated by road construction, and simultaneously treat and apply the separated wastewater, so that the resource is saved; in addition, the curing process time of the technical process to the mud is short, the efficiency is high, the whole mud treatment process is continuous operation of a production line, only about 1-2 hours are needed from the mud filtration to the compression molding in the first step, the cycle of mud treatment is short, the operation efficiency is high, and the problem of occupied land due to mud accumulation can be solved through a high-efficiency treatment process; the process almost realizes 100% recycling of water and slurry in the waste slurry, accords with national green development and sustainable development policies, changes waste into valuable, and realizes resource recycling.
In step S3, the method specifically includes the following steps:
s31, conveying the sewage into a primary sedimentation tank, adding a flocculating agent, standing and layering to obtain primary supernatant and primary sediment;
s32, transferring the primary supernatant obtained in the step S31 to a secondary sedimentation tank, adding a flocculating agent, standing and layering to obtain a secondary supernatant and a secondary precipitate;
s33, transferring the secondary supernatant obtained in the step S32 to a tertiary sedimentation tank, adding a flocculating agent, standing and layering to obtain a tertiary supernatant and a tertiary precipitate, wherein the tertiary supernatant can be used as engineering water, and transferring the primary precipitate, the secondary precipitate and the tertiary precipitate obtained in the steps S31-S33 to dewatering equipment for dewatering.
Through carrying out triple precipitation treatment on the sewage generated after dehydration, sludge impurities contained in the sewage can be fully degraded, and finally the obtained supernatant meets the requirement of engineering water, and simultaneously the sludge contained in the sewage can be separated to the maximum degree for reutilization.
In step S4, adding crushed stone and additives into the stirring equipment during the stirring process, wherein the additives include one or a combination of curing agent, water reducing agent and early strength agent. The hardness of the mud product prepared in the later period can be improved by adding the broken stone, the performance of the mud product is improved, the application effect is optimized, the forming can be accelerated by adding the additive, and the curing time is shortened.
In step S2, before transferring the slurry filtrate to the dewatering equipment, sampling from the slurry filtrate for performance detection, and determining whether an additive needs to be added for performance adjustment according to the detection result, so that the slurry filtrate meets the requirements of the dewatering equipment; and (4) preparing the slurry filtrate to meet the working requirement of the dewatering equipment, and then adding the slurry filtrate into the dewatering equipment. The mud filtrate is prepared to meet the working requirement of the dewatering equipment, so that the loss of the dewatering equipment in the working process can be reduced, and the service life is prolonged.
Further, in step S2, the performance test performed on the slurry filtrate includes three performances, i.e., viscosity, specific gravity, and rheology.
In step S5, the curing box is a multi-layer curing box, and an air blowing device and a heating device are disposed in a curing chamber in which the curing box is placed, and the air blowing device and the heating device are turned on to accelerate curing during curing. The maintenance box is set to be a multi-layer maintenance box, more mud products can be put into the maintenance box, and the occupied area in the maintenance process is reduced. The air blowing device and the heating device are arranged, hot air can be continuously supplied to the curing room, so that the curing speed is effectively accelerated, the curing time can be shortened to 1 day, and the construction period is greatly shortened.
Further, the set temperature in the curing chamber is 60-80 ℃.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made in the claims and the description of the present invention are within the scope of the present invention.
Claims (7)
1. A recycling process of waste slurry for highway construction is characterized by comprising the following steps:
s1, primary filtration: filtering the waste slurry through filtering equipment to obtain filter residues of large-particle-size solid particles and slurry filtrate, and conveying the obtained filter residues to mixing equipment for later use;
s2, mechanical dehydration: transferring the slurry filtrate obtained in the step S1 into dewatering equipment for mechanical dewatering to obtain sludge and sewage, and sending the obtained sludge to mixing equipment for later use;
s3, precipitation separation: conveying the sewage obtained in the step S2 to a sedimentation tank, adding a flocculating agent, standing for layering to obtain a supernatant and a precipitate, and transferring the precipitate to dewatering equipment for dewatering;
s4, stirring and mixing: adding a curing agent into mixing equipment containing the filter residue obtained in the step S1 and the sludge obtained in the step S2, and stirring and mixing to obtain a sludge material;
s5, curing and forming: and (5) filling the pug obtained in the step (S4) into a die, pressing, forming, demolding, transferring into a curing box, and curing to obtain a pug product.
2. The recycling process of the waste slurry for highway construction according to claim 1, wherein the step S3 comprises the following steps:
s31, conveying the sewage into a primary sedimentation tank, adding a flocculating agent, standing and layering to obtain primary supernatant and primary sediment;
s32, transferring the primary supernatant obtained in the step S31 to a secondary sedimentation tank, adding a flocculating agent, standing and layering to obtain a secondary supernatant and a secondary precipitate;
s33, transferring the secondary supernatant obtained in the step S32 to a tertiary sedimentation tank, adding a flocculating agent, standing and layering to obtain a tertiary supernatant and a tertiary precipitate, wherein the tertiary supernatant can be used as engineering water, and transferring the primary precipitate, the secondary precipitate and the tertiary precipitate obtained in the steps S31-S33 to dewatering equipment for dewatering.
3. The recycling process of the waste slurry for highway construction according to claim 1, which comprises the following steps: in step S4, during the stirring process, crushed stone and additives including one or a combination of curing agent, water reducing agent and early strength agent are also added into the stirring equipment.
4. The recycling process of the waste slurry for highway construction according to claim 1, which comprises the following steps: in step S2, before transferring the slurry filtrate into the dewatering equipment, sampling from the slurry filtrate for performance detection, and judging whether the additive needs to be added for performance adjustment according to the detection result, so that the slurry filtrate meets the requirements of the dewatering equipment; and (4) preparing the slurry filtrate to meet the working requirement of the dewatering equipment, and then adding the slurry filtrate into the dewatering equipment.
5. The recycling process of the waste slurry for highway construction according to claim 4, which comprises the following steps: in step S2, the performance test performed on the slurry filtrate includes three performances of viscosity, specific gravity, and rheology.
6. The recycling process of the waste slurry for highway construction according to claim 1, which comprises the following steps: in step S5, the curing box is a multi-layer curing box, and a blowing device and a heating device are disposed in a curing chamber in which the curing box is placed, and in the curing process, the blowing device and the heating device are turned on to accelerate curing.
7. The recycling process of the waste slurry for highway construction according to claim 6, which comprises the following steps: the set temperature in the curing chamber is 60-80 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911001543.4A CN110759613A (en) | 2019-10-21 | 2019-10-21 | Recycling process of waste slurry for highway construction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911001543.4A CN110759613A (en) | 2019-10-21 | 2019-10-21 | Recycling process of waste slurry for highway construction |
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| CN110759613A true CN110759613A (en) | 2020-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911001543.4A Withdrawn CN110759613A (en) | 2019-10-21 | 2019-10-21 | Recycling process of waste slurry for highway construction |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111875232A (en) * | 2020-08-10 | 2020-11-03 | 安徽工业大学 | Integrated treatment method for quickly separating mud and water from building waste slurry and solidifying filter mud |
| CN113336406A (en) * | 2021-06-03 | 2021-09-03 | 中铁海峡(厦门)环保技术有限公司 | Slurry filtering treatment process for building construction |
-
2019
- 2019-10-21 CN CN201911001543.4A patent/CN110759613A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111875232A (en) * | 2020-08-10 | 2020-11-03 | 安徽工业大学 | Integrated treatment method for quickly separating mud and water from building waste slurry and solidifying filter mud |
| CN111875232B (en) * | 2020-08-10 | 2022-07-08 | 安徽工业大学 | Integrated treatment method for quickly separating mud and water from building waste slurry and solidifying filter mud |
| CN113336406A (en) * | 2021-06-03 | 2021-09-03 | 中铁海峡(厦门)环保技术有限公司 | Slurry filtering treatment process for building construction |
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Application publication date: 20200207 |
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