CN216614386U - Bottom mud deep dehydration system - Google Patents

Abstract

The utility model discloses a bottom mud deep dehydration system which comprises a primary dehydration unit, a secondary dehydration unit, a tertiary dehydration unit and a residual water treatment unit, wherein the primary dehydration unit comprises a primary sedimentation tank and a sieving device, and the primary sedimentation tank is divided into a first part and a second part by the sieving device from top to bottom; the second-stage dehydration unit comprises a homogenizing mixer, a first dosing device and a dehydration box, wherein a discharge port of the second part is communicated with the homogenizing mixer, the first dosing device is used for adding a curing agent into the homogenizing mixer, and a discharge port of the homogenizing mixer is communicated with the dehydration box; the three-stage dehydration unit comprises a throwing turning machine, a feed port for feeding dehydrating agent into the throwing turning machine is arranged on the throwing turning machine, and the throwing turning machine is communicated with a discharge port of the dehydration box; the water outlet of the second part and the water outlet of the dewatering box are communicated with the residual water treatment unit. The bottom mud deep dehydration system is suitable for processing the bottom mud with large processing capacity, and has the advantages of high processing efficiency, low cost and small occupied area.

Description

Bottom mud deep dehydration system

Technical Field

The utility model belongs to the technical field of bottom mud treatment, and particularly relates to a bottom mud deep dehydration system.

Background

The river and lake bottom mud generated by dredging has the characteristics of high water content, large volume, difficulty in treatment, complex components and the like, and the water content of the river and lake bottom mud after dredging is generally over 90 percent, so that the volume of the bottom mud generated by dredging is large, the problems of difficult subsequent conveying, large capacity of treatment equipment, poor economy and the like are further generated, and therefore, the method has important significance for the water removal of the pretreatment of the dredging bottom mud on the subsequent treatment, disposal and further resource utilization.

The bottom mud dewatering method commonly used at home and abroad at present comprises a natural dewatering drying method, a vacuum prepressing dewatering method, a soil engineering pipe bag method and a mechanical dewatering method. The natural dehydration drying method is to utilize light energy and air convection to carry out natural dehydration and drying on the bottom mud or utilize the self-weight compaction of the bottom mud to promote the reduction of the water content, although the process has simple operation and the lowest direct treatment cost, is suitable for treating a small amount of bottom mud with medium-low water content rate and no pollution, the dehydration efficiency is low, the drying period is long, and a large amount of fields are required to be occupied for a long time. The vacuum preloading dehydration is to dehydrate the bottom mud by utilizing the vacuum pressure and the self weight of the bottom mud, and although the vacuum preloading dehydration is suitable for dehydrating the bottom mud with low organic matter content, high sand content and good water permeability, the processing cost is higher, the construction working area is large, and the construction period is longer. The geotextile tube bag method is used for compacting and placing the sediment to promote dehydration by utilizing the water permeability of the geotextile tube bag, is suitable for treating the sediment with large quantity and has lower direct treatment cost, but also has the defects of long construction period and larger occupied area. The mechanical dehydration uses the pressure difference between two sides of the filter medium as driving force to force the sludge water to pass through the filter medium to form filtrate, and the solid particles are intercepted on the medium to form filter cakes, thereby achieving the purpose of dehydration.

Therefore, a deep dewatering system for bottom mud is needed to solve the problems of the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a bottom mud deep dehydration system which is suitable for processing bottom mud with large capacity, and has the advantages of high processing efficiency, low cost and small occupied area.

In order to achieve the above object, the present invention provides a bottom mud deep dehydration system for processing bottom mud, comprising a primary dehydration unit, a secondary dehydration unit, a tertiary dehydration unit and a residual water processing unit, wherein the primary dehydration unit comprises a primary sedimentation tank and a screener for screening the bottom mud into solid impurities and mud, the screener divides the primary sedimentation tank into a first part and a second part from top to bottom, the bottom mud enters the primary sedimentation tank, the solid impurities are located in the first part, the mud is located in the second part and is precipitated in the second part to form precipitated mud; the second-stage dehydration unit comprises a homogenizing mixer, a first dosing device and a dehydration box, wherein a discharge port of the second part is communicated with the homogenizing mixer, the first dosing device is used for adding a curing agent into the homogenizing mixer, the homogenizing mixer is used for uniformly mixing the precipitated slurry with the curing agent, a discharge port of the homogenizing mixer is communicated with the dehydration box, and the precipitated slurry is sequentially processed by the homogenizing mixer and the dehydration box to form concentrated slurry; the three-stage dehydration unit comprises a throwing turning machine, wherein a feed inlet for feeding a dehydrating agent into the throwing turning machine is formed in the throwing turning machine, the throwing turning machine is communicated with a discharge port of the dehydration box, the throwing turning machine is used for uniformly mixing the dehydrating agent and the concentrated slurry, and the concentrated slurry is processed by the throwing turning machine to form soil with the water content of less than 50%; the water outlet of the second part and the water outlet of the dewatering box are communicated with the residual water treatment unit.

Compared with the prior art, the bottom sludge is subjected to mud-water separation through the primary dehydration unit, so that impurities in the bottom sludge can be screened out, the subsequent dehydration efficiency is improved, and the sediment sludge is precipitated to form sediment slurry, so that the water content of the bottom sludge can be reduced; the precipitated slurry is subjected to solidification treatment by the secondary dehydration unit, so that water contained in the precipitated slurry can be permeated out, the precipitated slurry is subjected to dehydration treatment to form concentrated slurry, and the water permeated out of the precipitated slurry can be removed to further reduce the water content of the bottom sludge; the concentrated slurry is thrown and turned over by the three-stage dehydration unit, so that water in the concentrated slurry can be evaporated and removed to form soil with the water content of less than 50%. Simultaneously, residual water generated by the bottom sludge in the first-stage dehydration unit and the second-stage dehydration unit can be directly discharged outwards after being treated by the residual water treatment unit, and a large-volume temporary storage pool for storing the residual water is not required to be arranged, so that the cost is further reduced.

Preferably, the screening device is a filtering screen, the filtering screen is in an inverted V shape, and the inverted V shape can quickly disperse the bottom mud around to avoid blocking screen holes.

Preferably, the first dosing device of the present invention includes a first dosing tank storing a curing agent, a first dosing pump, and a first pipeline, the homomixer is provided with a curing agent inlet, the homomixer is provided with a stirrer inside, the first dosing tank and the curing agent inlet are communicated via the first pipeline, and the first dosing pump is disposed on the first pipeline.

Preferably, a detection port for detecting the reaction effect of the curing agent and the precipitated slurry is arranged at the discharge port of the homomixer. The reaction effect of the curing agent and the precipitated slurry is detected through the detection port, so that the precipitated slurry and the curing agent can be fully mixed, and the moisture contained in the precipitated slurry can be permeated out as much as possible.

Preferably, the dewatering box of the utility model comprises a frame body and a plurality of geotextile bags arranged in the frame body, and the discharge port of the homogenizing mixer is communicated with the upper ends of the geotextile bags. The frame body can fix the geotextile bag to prevent the geotextile bag from shifting in the dehydration process; through geotechnique's sack, can further strengthen the dehydration effect to the mud that deposits, for mechanical dehydration simultaneously, then saved equipment input and running cost through geotechnique's tube bag.

Preferably, the frame body of the present invention is disposed on the outer wall of the homomixer. The frame body is arranged on the outer wall of the homogenizing mixer, so that the floor area of the bottom mud deep dehydration system can be further saved.

Preferably, the throwing and turning machine is provided with a heater, the top of the throwing and turning machine is provided with an exhaust port, and the exhaust port is provided with an exhaust fan. The concentrated slurry in the throwing turning machine is heated by the heat generated by the heater and is continuously turned under the action of the throwing turning machine to generate a large amount of water vapor, and the water vapor is removed under the action of the exhaust fan, so that the dehydration effect can be further improved.

Preferably, the discharge port of the second part of the utility model is communicated with the homogenizing mixer through a second pipeline, the second pipeline is provided with a first moisture content sensor, the throwing and turning machine is communicated with the discharge port of the dewatering box through a third pipeline, the third pipeline is provided with a second moisture content sensor, and the discharge port of the throwing and turning machine is provided with a third moisture content sensor.

Preferably, the residual water treatment unit comprises a pH adjusting area, a coagulating area, a flocculating area and a settling area which are sequentially communicated, wherein the pH adjusting area is provided with a second dosing device for adding a pH regulator into the pH adjusting area, the coagulating area is provided with a third dosing device for adding a coagulant into the coagulating area, and the flocculating area is provided with a fourth dosing device for adding a flocculating agent into the flocculating area. Specifically, the pH regulator is lime emulsion, the coagulant is polyaluminium chloride (PAC), and the flocculant is Polyacrylamide (PAM).

Preferably, the curing agent of the present invention comprises iron polyphosphate and calcium based, more specifically, calcium based includes at least one of calcium oxide, calcium chloride and hydroxyapatite.

Drawings

FIG. 1 is a schematic structural diagram of a bottom mud deep dehydration system of the present invention.

Detailed Description

To explain technical contents, structural features, and technical effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with specific embodiments.

Referring to fig. 1, the system 100 for deeply dewatering bottom mud of the present invention is used for treating bottom mud, and includes a primary dewatering unit 11, a secondary dewatering unit 12, a tertiary dewatering unit 13, and a residual water treatment unit 14, where the primary dewatering unit 11 includes a primary settling tank 111 and a screen 112 for screening the bottom mud into solid impurities and mud, the screen 112 divides the primary settling tank 111 into a first portion 1111 and a second portion 1112 from top to bottom, the bottom mud enters the primary settling tank 111, the solid impurities are located in the first portion 1111, the mud is located in the second portion 1112, and is precipitated in the second portion 1112 to form precipitated mud; the two-stage dehydration unit 12 comprises a homogenizing mixer 121, a first dosing device 122 and a dehydration tank 123, wherein a discharge port 1113 of the second part 1112 is communicated with the homogenizing mixer 121, the first dosing device 122 is used for adding a curing agent into the homogenizing mixer 121, the homogenizing mixer 121 is used for uniformly mixing the precipitated slurry with the curing agent, a discharge port 1211 of the homogenizing mixer 121 is communicated with the dehydration tank 123, and the precipitated slurry is sequentially processed by the homogenizing mixer 121 and the dehydration tank 123 to form concentrated slurry; the third-stage dehydration unit 13 comprises a throwing and turning machine 131, a feed port 1311 for feeding dehydrating agents into the throwing and turning machine 131 is arranged on the throwing and turning machine 131, the throwing and turning machine 131 is communicated with a discharge port 1321 of the dehydration box 123, the throwing and turning machine 131 is used for uniformly mixing the dehydrating agents and the concentrated slurry, and the concentrated slurry is processed by the throwing and turning machine 131 to form soil with the water content of less than 50%; the water outlet 1114 of the second section 1112 and the water outlet 1233 of the dewatering box 123 are both in communication with the residual water treatment unit 14. The sediment is conveyed from the sediment storage tank 16 to the primary dewatering unit 11 through the first sludge pump 15, and is subjected to sludge-water separation through the primary dewatering unit 11, so that impurities in the sediment can be screened out, the subsequent dewatering efficiency is improved, and the sediment is precipitated to form sediment slurry, so that the water content of the sediment can be reduced; the precipitated slurry is subjected to solidification treatment by the secondary dehydration unit 12, so that water contained in the precipitated slurry can be permeated out, dehydration treatment is carried out to form concentrated slurry, and the water permeated out from the precipitated slurry can be removed to further reduce the water content of the bottom sludge; the concentrated slurry is thrown and turned over by the third-stage dehydration unit 13, so that water in the concentrated slurry can be evaporated and removed, more specifically, the concentrated slurry can be evaporated from the feeding port 1311 to form soil with the water content of less than 50%. Meanwhile, residual water generated by the bottom sludge in the first-stage dehydration unit 11 and the second-stage dehydration unit 12 can be directly discharged outwards after being treated by the residual water treatment unit 14, and a temporary storage pool with a large volume for storing the residual water is not required to be arranged, so that the cost is further reduced.

Referring to fig. 1, the sifter 112 of the present invention is a filtering screen with an inverted V-shape, which can disperse the sediment around quickly to avoid blocking the holes of the sifter. In order to further dehydrate the sediment, the first chemical adding device 122 of the present invention includes a first chemical adding box 1221 storing a curing agent, a first chemical adding pump 1222, and a first pipeline 1223, wherein the homogenizer 121 is provided with a curing agent inlet 1212, a stirrer 1213 is provided inside the homogenizer 121, the first chemical adding box 1221 is communicated with the curing agent inlet 1212 through the first pipeline 1223, and the first chemical adding pump 1222 is provided on the first pipeline 1223, so that the curing agent enters the homogenizer 121 through the curing agent inlet 1212 and is mixed with the precipitated mud in the homogenizer 121, so that moisture in the precipitated mud permeates out. A detection port 1214 for detecting the reaction effect of the curing agent and the precipitated slurry is arranged at the discharge port 1211 of the homomixer 121, a second sludge pump 17 is arranged between the discharge port 1211 of the homomixer 121 and the dewatering box 123, the reaction effect of the curing agent and the precipitated slurry is detected through the detection port 1214, the precipitated slurry and the curing agent can be fully mixed, so that moisture contained in the precipitated slurry can permeate out as much as possible, and after the curing agent and the precipitated slurry are detected to completely react, the second sludge pump 17 is started to convey the mixture of the precipitated slurry and the curing agent in the homomixer 121 to the dewatering box 123. Specifically, the dewatering box 123 includes a frame 1231 and a plurality of geotextile bags 1232 arranged inside the frame 1231, and the discharge port 1211 of the homomixer 121 is communicated with the upper ends 12321 of the geotextile bags 1232. The frame 1231 can fix the geotextile bag 1232 to prevent the geotextile bag 1232 from shifting in the dehydration process; the dewatering effect on the precipitated slurry can be further strengthened through the geotextile bag 1232, and meanwhile, compared with mechanical dewatering, the equipment investment and the operation cost are saved through the geotextile tube bag 1232. Preferably, the frame 1231 of the present invention is disposed on the outer wall of the homomixer 121, which further saves the floor space of the bottom mud deep-dewatering system 100. In addition, a heater (not shown in fig. 1) is arranged on the flipping machine 131 of the present invention, an exhaust port 1312 is arranged at the top of the flipping machine 131, and an exhaust fan 1313 is arranged at the exhaust port 1312. The concentrated slurry in the throwing turnover machine 131 is heated by the heat generated by the heater, and is continuously turned under the action of the throwing turnover machine 131 to generate a large amount of water vapor, and the water vapor is removed under the action of the exhaust fan 1313, so that the dewatering effect can be further improved.

Referring to fig. 1, the discharge port 1113 of the second part 1112 is communicated with the homogenizer 121 via a second pipeline 18, the second pipeline 18 is provided with a first moisture content sensor 181, the throwing and turning machine 131 is communicated with the discharge port 1321 of the dewatering box 123 via a third pipeline 182, the third pipeline 182 is provided with a second moisture content sensor 183, and the discharge port 1314 of the throwing and turning machine 131 is provided with a third moisture content sensor 184. More specifically, the second pipeline 18 is provided with a third mud pump 185, the third pipeline 182 is provided with a fourth mud pump 186, the discharge port 1314 of the turning-over machine 131 is provided with a fifth mud pump 187, more specifically, the value monitored by the first water content sensor 181, namely when the value is lower than 92%, the processing of the primary dewatering unit 11 can be judged to be completed, and the third mud pump 185 is started to convey the precipitated mud in the primary dewatering unit 11 to the secondary dewatering unit 12; the second water content sensor 183 is used for monitoring the value, namely when the value is lower than 80%, the second-stage dehydration unit 12 can be judged to be finished, and at the moment, the naked eye cannot see bright water in the concentrated slurry, the fourth sludge pump 186 is started, and the concentrated slurry is conveyed from the second-stage dehydration unit 12 to the third-stage dehydration unit 13; meanwhile, the third water content sensor 184 detects a value, that is, when the water content is lower than 50%, it is judged that the third-stage dehydration unit 13 completes the treatment, that is, the bottom mud is dehydrated, the fifth mud pump 187 is started, the mud with the water content lower than 50% is discharged, and the mud is further buried or recycled.

Referring to fig. 1, preferably, the residual water treatment unit 14 of the present invention includes a pH adjustment region 141, a coagulation region 142, a flocculation region 143, and a precipitation region 144, which are sequentially connected, wherein the pH adjustment region 141 is provided with a second chemical adding device 1411 for adding a pH adjusting agent to the pH adjustment region 141, the coagulation region 142 is provided with a third chemical adding device 1421 for adding a coagulant to the coagulation region 142, and the flocculation region 143 is provided with a fourth chemical adding device 1431 for adding a flocculant to the flocculation region 143. A pH adjusting zone 141 is provided with a pH adjusting agent adding port 1412, a coagulating zone 142 is provided with a coagulant adding port 1422, a flocculating agent adding port 1432 is provided on the flocculating zone 143, the second feeding device 1411 comprises a second feeding box 14111 and a second feeding pump 14112 for storing a pH adjusting agent, the second feeding box 14111 is communicated with the pH adjusting agent adding port 1412, the third feeding device 1421 comprises a third feeding box 14211 and a third feeding pump 14212 for storing a flocculating agent, the third feeding box 14211 is communicated with the flocculating agent adding port 1422, the fourth feeding device 1431 comprises a fourth feeding box 14311 and a fourth feeding pump 14312 for storing a flocculating agent, the fourth feeding box 14311 is communicated with the flocculating agent adding port 1432, stirrers (not shown in figure 1) are arranged inside the pH adjusting zone 141, the coagulating zone 142 and the flocculating zone 143, specifically, the pH adjusting agent is lime milk, the lime milk can also have the function of adsorbing heavy metal ions, and is polyaluminium chloride (PAC), the flocculant is Polyacrylamide (PAM). Residual water generated in the dehydration process of the first-stage dehydration unit 11 and the second-stage dehydration unit 12 enters a pH adjusting area 141, lime emulsion is added from a pH regulator adding port 1412 under the stirring condition for pH adjustment, and the pH adjustment can be automatically controlled by a pH meter; the remaining water after the pH adjustment enters the coagulation zone 142, and PAC is added from the coagulant addition port 1422 under stirring; after the rest water is subjected to coagulation reaction for 15min, the rest water enters the flocculation area 143, and PAM is added from a flocculant adding port 1432 under the stirring condition; and after the residual water is subjected to flocculation reaction for 15min, the residual water enters the settling area 144, mud and water separation is carried out on the residual water containing the slurry in the settling area 144, and the supernatant automatically flows into a water outlet area and is discharged after reaching the standard.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the utility model is not limited by the scope of the appended claims.

Claims (9)

1. A bottom mud deep dehydration system is used for processing bottom mud and is characterized by comprising a primary dehydration unit, a secondary dehydration unit, a tertiary dehydration unit and a residual water processing unit,

the primary dewatering unit comprises a primary sedimentation tank and a screen for screening the bottom sludge into solid impurities and sludge, the screen divides the primary sedimentation tank into a first part and a second part from top to bottom, the bottom sludge enters the primary sedimentation tank, the solid impurities are located in the first part, the sludge is located in the second part and is precipitated in the second part to form precipitated sludge;

the secondary dehydration unit comprises a homogenizing mixer, a first dosing device and a dehydration box, wherein a discharge port of the second part is communicated with the homogenizing mixer, the first dosing device is used for adding a curing agent into the homogenizing mixer, the homogenizing mixer is used for uniformly mixing the precipitated slurry with the curing agent, a discharge port of the homogenizing mixer is communicated with the dehydration box, and the precipitated slurry is sequentially processed by the homogenizing mixer and the dehydration box to form concentrated slurry;

the three-stage dehydration unit comprises a throwing turning machine, a feed port for feeding a dehydrating agent into the throwing turning machine is arranged on the throwing turning machine, the throwing turning machine is communicated with a discharge port of the dehydration box, the throwing turning machine is used for uniformly mixing the dehydrating agent and the concentrated slurry, and the concentrated slurry is processed by the throwing turning machine to form soil with the water content of less than 50%;

and the water outlet of the second part and the water outlet of the dewatering box are communicated with the residual water treatment unit.

2. The system for deep dewatering of sediment according to claim 1, wherein the screen is a filter screen that is inverted V-shaped.

3. The system according to claim 1, wherein the first chemical adding device comprises a first chemical adding box for storing the curing agent, a first chemical adding pump, and a first pipeline, wherein the homogenizing mixer is provided with a curing agent inlet, a stirrer is arranged in the homogenizing mixer, the first chemical adding box is communicated with the curing agent inlet through the first pipeline, and the first chemical adding pump is arranged on the first pipeline.

4. The system for deeply dehydrating the sediment according to claim 1, wherein a discharge port of the homomixer is provided with a detection port for detecting the reaction effect of the curing agent and the settled slurry.

5. The system for deep dewatering of sediment according to claim 1, wherein the dewatering box comprises a frame and a plurality of geotextile bags arranged inside the frame, and the discharge port of the homomixer is communicated with the upper ends of the geotextile bags.

6. The system for deep dewatering of sediment according to claim 5, wherein the frame is disposed on an outer wall of the homomixer.

7. The deep sediment dewatering system of claim 1, wherein the turning machine is provided with a heater, the turning machine is provided with an exhaust port at the top, and the exhaust port is provided with an exhaust fan.

8. The system for deeply dehydrating the sediment according to claim 1, wherein the discharge port of the second part is communicated with the homogenizing mixer through a second pipeline, a first water content sensor is arranged on the second pipeline, the throwing and turning machine is communicated with the discharge port of the dewatering box through a third pipeline, a second water content sensor is arranged on the third pipeline, and a third water content sensor is arranged on the discharge port of the throwing and turning machine.

9. The bottom sediment deep dehydration system of claim 1, wherein the residual water treatment unit comprises a pH adjusting zone, a coagulating zone, a flocculating zone and a settling zone which are sequentially communicated, wherein the pH adjusting zone is provided with a second dosing device for adding a pH regulator into the pH adjusting zone, the coagulating zone is provided with a third dosing device for adding a coagulant into the coagulating zone, and the flocculating zone is provided with a fourth dosing device for adding a flocculant into the flocculating zone.

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