CN112125496A

CN112125496A - Production process for dehydrating and curing sludge

Info

Publication number: CN112125496A
Application number: CN202010807774.0A
Authority: CN
Inventors: 胡益诚; 夏再龙
Original assignee: Zhejiang Weimei Environmental Protection Engineering Technology Co ltd
Current assignee: Zhejiang Weimei Environmental Protection Engineering Technology Co ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2020-12-25

Abstract

The application relates to a production process for dewatering and curing sludge, which comprises the following steps of S1, extracting sludge: pumping the slurry from the slurry and sludge pool into a slurry conveying pipe through a slurry pump; s2, mud sludge sedimentation: the slurry sludge sequentially passes through an inorganic flocculation tank and an organic flocculation tank in the slurry conveying pipe; s3, dehydrating the slurry sludge, and after the slurry sludge is flocculated, allowing the slurry sludge to enter a geotextile tube bag through a slurry conveying pipe for dehydration; and S4, taking the solidified mud out of the geotextile bag. The soil body solidification method has the advantages that the inorganic flocculating agent and the organic flocculating agent are added in order to accelerate flocculation and precipitation of mud, silt and sludge when the mud, the silt and the sludge are conveyed from the slurry tank to the soil engineering pipe bag for dehydration, the dehydration process is accelerated, the solidification time is shortened, and the soil body solidification rate is improved.

Description

Production process for dehydrating and curing sludge

Technical Field

The application relates to the field of mud solidification technology, in particular to a production process for dewatering and solidifying mud and sludge.

Background

At present, the mud is a flocculent or honeycomb structure formed by deposition of fine particles such as clay minerals and the like in slow flowing water environments such as oceans or lake regions and the like under the action of inter-particle electrostatic force and molecular attraction, and the water content of the mud is 1.2-2.0 times of the water content of a liquid limit. The mud is a mixed liquid formed by the sludge diffused in water, and the water content of the mud is larger than that of the sludge. Therefore, the sludge and the mud are in a flowing state, almost have no strength and are difficult to be directly used for engineering, and further a great deal of land resources are wasted.

At present, the domestic resource utilization of the sludge mainly comprises methods such as mechanical treatment, hydraulic filling and land reclamation, physical dehydration, heat treatment, curing agent treatment and the like. Chinese patent publication No. CN105859068A, a sludge treatment process, discloses a method for pretreating sludge by a sludge settling tank, then solidifying slurry by stirring, solidifying, dewatering and solidifying, and finally finishing the treatment by stacking and aging.

In view of the above-mentioned related technologies, the inventor believes that the solution requires a long time for standing the sludge, and requires various transportation and treatment devices for assistance, which has the defect of long treatment period and high cost.

Disclosure of Invention

In order to reduce the treatment period of dehydration and solidification, the application provides a production process for dehydration and solidification treatment of sludge.

The production process for the dehydration and solidification treatment of the sludge provided by the application adopts the following technical scheme:

a production process for dewatering and curing sludge comprises the following steps:

s1, slurry sludge extraction: pumping the slurry from the slurry and sludge pool into a slurry conveying pipe through a slurry pump;

s2, mud sludge sedimentation: the slurry sludge sequentially passes through an inorganic flocculation tank and an organic flocculation tank in the slurry conveying pipe;

s3, dehydrating the slurry sludge, and after the slurry sludge is flocculated, allowing the slurry sludge to enter a geotextile tube bag through a slurry conveying pipe for dehydration;

s4, taking the solidified mud out of the geotechnical pipe bag;

the inorganic flocculation tank comprises a first mixing pipe, a first stirring group and a first feeding pump, wherein two ends of the first mixing pipe are communicated with the slurry conveying pipe; the organic flocculation tank comprises a second mixing pipe, a second stirring group and a second feeding pump, wherein two ends of the second mixing pipe are communicated with the inside of the slurry conveying pipe;

the slurry conveying pipe comprises a transition pipe for connecting a first mixing pipe and a second mixing pipe, and the length of the transition pipe is not less than 10m and not more than 50 m.

Through adopting above-mentioned technical scheme, during slurry silt was taken into the thick liquids conveying pipeline by the mud pump in the mud silt pond, through on the thick liquids conveying pipeline behind external inorganic flocculation basin and the organic flocculation basin, by polymerization sedimentation with higher speed, concentrate on the geotechnological tube bag at last, the gap circulation that the flowing water passes through the geotechnological tube bag is outside, and remaining solid thick liquids are left over in the geotechnological tube bag, realize the solidification dehydration. Wherein the slurry sludge is coagulated by the inorganic flocculant, the inorganic flocculant enables a compressed double electric layer to be generated in the slurry sludge, suspension particles in the wastewater lose stability, colloidal particles are coagulated mutually to enlarge the particles, and a flocculating constituent is formed. After the flocculating constituent grows to a certain volume, the flocculating constituent is separated from the water phase sediment under the action of gravity, so that a large amount of suspended matters in the mud and sludge can be quickly removed, and the effect of water treatment is achieved; meanwhile, positive ions such as aluminum, iron and the like can be dissolved out in a mud and sludge system, the effect of electric neutralization can be achieved, a high molecular polymer is formed by the nonionic surfactant, the charges of the polymer can be continuously increased along with the continuous progress of the polycondensation reaction, finally, the colloid is destabilized and condensed, the process mainly occurs in the transition pipe, and therefore the length of the transition pipe needs to be controlled within ten meters to fifty meters, and the coagulation integrity is ensured. On the other hand, the slurry and sludge after coagulation also needs to be added with an organic flocculant, so that suspended matters in the slurry and sludge can pass through the coagulation again, and the aims of flocculation and secondary accelerated precipitation are fulfilled after bridging adsorption. And finally, the slurry sludge after coagulation and flocculation is concentrated in the soil engineering pipe bag for collection, compared with the prior art, the inorganic flocculant and the organic flocculant accelerate coagulation, accelerate the time of dehydration and solidification of the slurry sludge, improve the efficiency and reduce the treatment cost and the operation steps.

Preferably, the flow ratio of the mud flow to the inorganic flocculant flow to the organic flocculant flow is 2:1: 0.5.

By adopting the technical scheme, the use of the inorganic flocculant and the organic flocculant is reduced and the operation cost is reduced on the premise of meeting the aim of accelerating coagulation and precipitation by controlling the flow ratio.

Preferably, first stirring group is including being provided with the first mixer of five at least, the row's of intercommunication material pipe of the first mixer of intercommunication and first feed pump, arrange the material pipe and communicate through the discharge tube that has the valve between every first mixer, on the first feed pump through be provided with the conveying pipeline that has many shunt tubes with first hybrid tube intercommunication.

Through adopting above-mentioned technical scheme, set up five first mixers more than, when satisfying the inorganic flocculating agent's of each platform stirring time, realize that the inorganic flocculating agent in a first mixer is used up after, subsequent first mixer can be continuous feed to ensure that first feed pump can be to the continuous feed of first hybrid tube.

Preferably, the second stirring group includes the second mixer of at least two, the row's of intercommunication second mixer and second feed pump material pipe, arrange the discharge tube intercommunication through the discharge tube that has the valve between pipe and every second mixer, on the second feed pump through be provided with the conveying pipeline that has many shunt tubes with the second hybrid tube intercommunication.

Through adopting above-mentioned technical scheme, it is the same with the purpose of first stirring group to set up the purpose more than two with the second mixer for the second feed pump can continuously feed the second blender.

Preferably, the inorganic flocculant is polyethylene oxide powder, and the inorganic flocculant is fully stirred with clean water in a first stirrer for more than forty minutes to form a clear solution with the concentration of 40% after complete dissolution.

By adopting the technical scheme, the concentration of the polyethylene oxide powder in the inorganic flocculant is controlled to be about 40%, and meanwhile, the stirring time of more than forty minutes is required so as to ensure that the polyethylene oxide powder can be fully dissolved in clear water.

Preferably, a curing assistant is further added into the inorganic flocculant, and the curing assistant is fly ash.

By adopting the technical scheme, the addition of the fly ash in the curing auxiliary agent can improve the coagulation effect and can also play a role in accelerating solid-liquid separation.

Preferably, the organic flocculant is anionic polyacrylamide powder, and the organic flocculant is fully stirred with clear water in a second stirrer for more than forty minutes to form clear liquid with the concentration of 40% after complete dissolution.

By adopting the technical scheme, the concentration of the anionic polyacrylamide powder is controlled to be about 40%, and meanwhile, the stirring time of more than forty minutes is required so as to ensure that the anionic polyacrylamide powder can be fully dissolved in clear water.

Preferably, the first mixer, the first supply pump, the second mixer, and the second supply pump are placed in a warehouse.

Through adopting above-mentioned technical scheme, concentrate on the warehouse with multiple equipment in, make on the one hand can let the operation workman monitor together operation, on the other hand can avoid irrelevant personnel to control to play secret and safe effect.

Preferably, the first mixing pipe and the first mixing pipe comprise a cylindrical mixing pipe and an accelerating pipe which is positioned at the outlet end and is in a round table shape.

Through adopting above-mentioned technical scheme, the accelerating tube of first hybrid tube and second hybrid tube anterior segment is the throat device, can accelerate the mixing of mud silt and different flocculating agents in the compounding pipe, and then improve the flocculation effect.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the slurry, the sludge and the sludge are conveyed from the slurry tank to the soil engineering pipe bag for dehydration, the inorganic flocculant and the organic flocculant are added in order, so that the flocculation and the precipitation of the slurry, the sludge and the sludge can be accelerated, the dehydration process is accelerated, the solidification time is reduced, and the solid content of a soil body is improved;

2. through concentrating equipment in the warehouse can be convenient for operating personnel management and avoid irrelevant personnel to operate, ensure equipment operation safety.

Drawings

FIG. 1 is a flowchart of the operation of the present embodiment;

fig. 2 is a schematic layout of an inorganic flocculant and an organic flocculation basin.

Description of reference numerals: 1. a slurry pump; 2. a mud sludge tank; 3. a slurry delivery pipe; 4. an inorganic flocculation tank; 5. an organic flocculation tank; 6. a soil engineering pipe bag; 7. a first mixing tube; 8. a first stirring group; 9. a first feed pump; 10. a second mixing tube; 11. a second stirring group; 12. a second feed pump; 13. a transition duct; 14. a first mixer; 15. a discharge pipe; 16. a discharge pipe; 17. a valve; 18. a delivery pipe; 19. a shunt tube; 20. a second mixer; 21. a mixing pipe; 22. an accelerating tube.

Detailed Description

The present application is described in further detail below with reference to figures 1-2.

The embodiment of the application discloses a production process for dehydrating, curing and treating sludge, which comprises the following steps:

s1, slurry sludge extraction: is pumped from the sludge tank 2 by a slurry pump 1 into a slurry feed pipe 3. The mud sludge tank 2 can collect mud sludge generated from different places to achieve the purpose of primary sedimentation, and then the mud pump 1 is placed in the middle of the mud sludge tank 2 to continuously extract the mud sludge and simultaneously reduce the influence on supernatant liquor as much as possible.

S2, mud sludge sedimentation: the slurry sludge sequentially passes through the inorganic flocculation tank 4 and the organic flocculation tank 5 in the slurry conveying pipe 18, and the inorganic flocculant and the organic flocculant accelerate coagulation and precipitation of the slurry sludge so as to reduce the subsequent dehydration time of the slurry sludge in the soil engineering pipe bag 6.

Referring to fig. 1 and 2, the inorganic flocculation tank 4 comprises a first stirring group 8 for stirring and mixing the inorganic flocculant, a first mixing pipe 7 with both ends communicated with each other and disposed in a slurry conveying pipe 18, and a first feed pump 9 for conveying the inorganic flocculant in the first stirring group 8 into the first mixing pipe 7. In the present embodiment, the first stirring group 8 is preferably provided with five first stirring machines 14, each first stirring machine 14 is independently operated and stirred so as to allow the inorganic flocculant to be stirred in the clean water for more than forty minutes, and the stirring speed of the first stirring machine 14 is controlled between 60 and 80 revolutions per minute. The first stirring group 8 further comprises a discharging pipe 15 respectively connected to the first feeding pump 9, and a discharging pipe 16 separately connected to each first stirring machine 14 is arranged on the discharging pipe 15, and a valve 17 is arranged on the discharging pipe 16 to realize the separate connection between each first stirring machine 14 and the first feeding pump 9. After one first stirring machine 14 runs out of the inorganic flocculant, the other first stirring machine 14 which is completely stirred can be opened to continue feeding, and the other first stirring machines 14 can continue feeding.

On the other hand, referring to fig. 2, the discharge port of the first feeding pump 9 is connected with a material delivery pipe 18, the other end of the material delivery pipe 18 is provided with a plurality of shunt pipes 19, and the shunt pipes 19 are communicated with different positions of the first mixing pipe 7 to realize the supply of the inorganic flocculant to different positions of the first mixing pipe 7. So that the slurry sludge, after entering the slurry feed pipe 18 by the slurry pump 1, can start to react with the inorganic flocculant while entering the first mixing pipe 7. The first mixing pipe 7 includes a cylindrical mixing pipe 21 at one end and a circular truncated cone-shaped accelerating pipe 22 at the other end. The mixing pipe 21 is communicated with the shunt pipe 19, and the accelerating pipe 22 is arranged in a round table shape, so that the flow direction of mud, silt and sludge flocculating agent is changed to a certain extent while the flow rate is accelerated after the pipe diameter is reduced, and the reaction between the mud, silt and sludge flocculating agent is promoted.

The organic flocculation tank 5 is substantially the same as the inorganic flocculation tank 4 in general structure, and comprises a second mixing pipe 10, a second stirring group 11 and a second feed pump 12. The difference is mainly that the second mixer 20 in the second mixing group 11 is provided with two mixers, which are mainly related to the amount of the organic flocculant, but not limited to two mixers. The rest of the layout and the equipment can adopt the same type of equipment. The first mixing pipe 7 is communicated with the second mixing pipe 10 through a transition pipe 13, and the length of the transition pipe 13 is controlled between 10m and 50m according to the frequent reaction effect of the organic flocculant.

In the method, the inorganic flocculant adopts polyethylene oxide powder, the polyethylene oxide powder is fully stirred with clear water in a first stirrer 14 for more than forty minutes to form clear liquid with the concentration of 40 percent after being completely dissolved, meanwhile, a curing assistant is added into the polyethylene oxide powder, the curing assistant is fly ash, and the main oxides of the fly ash comprise SiO2, Al2O3, FeO, Fe2O3, CaO, TiO2 and the like. On the other hand, the organic flocculant adopts anionic polyacrylamide powder, and the anionic polyacrylamide powder is fully stirred with clean water in a second stirrer 20 for more than forty minutes to form clear liquid with the concentration of 40% after being completely dissolved. In the scheme, the flow ratio of the slurry flow to the inorganic flocculant flow to the organic flocculant flow is 2:1:0.5, and the flocculation effect is ensured while the use amount of the flocculant is reduced.

Foretell first mixer 14, first feed pump 9, second mixer 20 and second feed pump 12 all concentrate on placing in a warehouse, have special operating personnel to watch and use, reduce staff's manipulation strength on the one hand, avoid a lot of reciprocal running to add the flocculating agent, and can often observe whether safe operation of equipment, on the other hand avoid some irrelevant personnel to operate equipment and use, reduce the safety risk.

S3, dehydrating the slurry sludge, allowing the slurry sludge to enter the geotextile tube bag 6 along with the slurry conveying pipe 18 after the slurry sludge rapidly condenses and flocculates in the inorganic flocculation tank 4 and the organic flocculation tank 5, placing the slurry sludge at the place, allowing the flowing water to flow out through gaps in the geotextile tube bag 6, and simultaneously leaving polymers or sundries and the like in the geotextile tube bag 6 to realize dehydration and solidification;

and S4, finally, taking the solidified mud out of the geotextile tube bag 6, wherein the geotextile tube bag 6 can be used again.

The implementation principle of the production process for dehydrating and curing the sludge in the embodiment of the application is as follows: the slurry sludge is coagulated by the inorganic flocculant, the inorganic flocculant enables a compressed double electric layer to be generated in the slurry sludge, suspension particles in the wastewater lose stability, colloidal particles are mutually coagulated to enlarge the particles, and a flocculating constituent is formed. After the flocculating constituent grows to a certain volume, the flocculating constituent is separated from the water phase sediment under the action of gravity, so that a large amount of suspended matters in the mud and sludge can be quickly removed, and the effect of water treatment is achieved; meanwhile, positive charge ions such as aluminum, iron and the like can be dissolved out in a slurry and sludge system, the effect of electric neutralization can be achieved, a high molecular polymer is formed by the nonionic surfactant, the charges of the polymer can be continuously increased along with the continuous progress of the polycondensation reaction, finally, the colloid is destabilized and condensed, the process mainly occurs in the transition pipe 13, and therefore the length of the transition pipe 13 needs to be controlled within ten meters to fifty meters, and the coagulation completeness is ensured. On the other hand, the slurry and sludge after coagulation also needs to be added with an organic flocculant, so that suspended matters in the slurry and sludge can pass through the coagulation again, and the aims of flocculation and secondary accelerated precipitation are fulfilled after bridging adsorption.

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

1. A production process for dehydrating and curing sludge is characterized by comprising the following steps:

s1, slurry sludge extraction: the slurry is pumped into a slurry conveying pipe (3) from a slurry sludge tank (2) through a slurry pump (1);

s2, mud sludge sedimentation: the mud sludge passes through an inorganic flocculation tank (4) and an organic flocculation tank (5) in a slurry conveying pipe (18) in sequence;

s3, dehydrating the slurry sludge, and after the slurry sludge is flocculated, allowing the slurry sludge to enter the soil engineering pipe bag (6) through the slurry conveying pipe (18) for dehydration;

s4, taking out the solidified mud from the geotextile tube bag (6);

the inorganic flocculation tank (4) comprises a first mixing pipe (7) with two ends communicated with the inside of the slurry conveying pipe (18), a first stirring group (8) for mixing the inorganic flocculant, and a first feeding pump (9) for transferring the inorganic flocculant into the first mixing pipe (7); the organic flocculation tank (5) comprises a second mixing pipe (10) with two ends communicated with the inside of the slurry conveying pipe (18), a second stirring group (11) for mixing the organic flocculant, and a second feeding pump (12) for transferring the organic flocculant into the second mixing pipe (10);

the slurry conveying pipe (3) comprises a transition pipe (13) for connecting the first mixing pipe (7) and the second mixing pipe (10), and the length of the transition pipe (13) is not less than 10m and not more than 50 m.

2. The process of claim 1 for the production of a sludge slurry dewatering and solidification process, wherein: the flow ratio of the slurry flow to the inorganic flocculant flow to the organic flocculant flow is 2:1: 0.5.

3. The process of claim 2 for the production of a sludge slurry dewatering and solidification process, wherein: first stirring group (8) are including being provided with first mixer (14), the first mixer of intercommunication (14) and the row of discharge pipe (15) of first feed pump (9) of five at least, arrange through discharge pipe (16) intercommunication that has valve (17) between discharge pipe (15) and every first mixer (14), on first feed pump (9) through be provided with conveying pipeline (18) that have many shunt tubes (19) with first hybrid tube (7) intercommunication.

4. The process of claim 3 for the production of a sludge slurry dewatering and solidification process, wherein: second stirring group (11) are including second mixer (20), the row of intercommunication second mixer (20) and second feed pump (12) of at least two material pipe (15), arrange material pipe (15) and communicate through discharge tube (16) that have valve (17) between every second mixer (20), on second feed pump (12) through being provided with conveying pipeline (18) that have many shunt tubes (19) with second hybrid tube (10) intercommunication.

5. The process of claim 3 for the production of a sludge slurry dewatering and solidification process, wherein: the inorganic flocculant is polyethylene oxide powder, and is fully stirred with clear water in a first stirrer (14) for more than forty minutes to form clear liquid with the concentration of 40% after being completely dissolved.

6. The process of claim 5 for the production of a sludge slurry dewatering and solidification process, wherein: the inorganic flocculant is also added with a curing assistant, and the curing assistant is fly ash.

7. The process of claim 4 for the production of a sludge slurry dewatering and solidification process, wherein: the organic flocculant is anionic polyacrylamide powder, and is fully stirred with clear water in a second stirrer (20) for more than forty minutes to form clear liquid with the concentration of 40% after being completely dissolved.

8. The process of claim 4 for the production of a sludge slurry dewatering and solidification process, wherein: the first stirrer (14), the first feeding pump (9), the second stirrer (20) and the second feeding pump (12) are placed in a warehouse.

9. The process of claim 1 for the production of a sludge slurry dewatering and solidification process, wherein: the first mixing pipe (7) and the first mixing pipe (7) comprise cylindrical mixing pipes (21) and accelerating pipes (22) which are located at the outlet end and are in a circular truncated cone shape.