CN209890472U - Contaminated bottom mud drying treatment system - Google Patents
Contaminated bottom mud drying treatment system Download PDFInfo
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- CN209890472U CN209890472U CN201822245922.5U CN201822245922U CN209890472U CN 209890472 U CN209890472 U CN 209890472U CN 201822245922 U CN201822245922 U CN 201822245922U CN 209890472 U CN209890472 U CN 209890472U
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Abstract
The utility model discloses a pollute mummification's of bed mud processing system. The treatment system for drying the polluted bottom sludge comprises a sand-gravel garbage separation device, a bottom sludge concentration device, an automatic dosing device, a sludge tank, a bottom sludge dehydration device, a residual water treatment device and a dried sludge conveying device. Through using the utility model discloses a processing system can realize polluting the integration processing that sediment original place fast drying, sediment go black deodorization and residual water were handled, reaches the purpose that pollutes sediment minimizing and innoxious to reduce sediment transportation and residual water handling capacity and the processing degree of difficulty, extension equipment life effectively reduces sediment treatment cost, avoids secondary pollution.
Description
Technical Field
The utility model relates to a sludge treatment technical field, in particular to pollute processing system of sediment mummification.
Background
With the development of economy and the promotion of urbanization in China, a large amount of industrial wastewater, domestic sewage and the like generated along the river and town streets are discharged, the river is seriously polluted, the ecological system of the river is seriously damaged, the life of residents is influenced, and the health of human bodies is harmed. At present, rivers in most cities in China have pollution of different degrees, and particularly, the pollution is prominent in cities with more developed industrial development. The pollutants entering the river channel are finally deposited into the bottom mud and gradually enriched to form polluted bottom mud which is a key endogenous pollutant of rivers and lakes. Dredging is the main measure for treating the endogenous pollution of rivers and lakes at home and abroad at present, and aims to remove the polluted bottom mud in the water bodies of rivers and lakes, reduce the content of the endogenous pollutants of the rivers and lakes, improve the water quality of the rivers and lakes and improve the aquatic ecological environment. With the development of river and lake sediment dredging engineering, the treatment and disposal of a large amount of dredged sludge becomes another problem to be solved urgently.
As rivers and lakes are polluted by coastal domestic sewage, industrial wastewater and the like, pollutants in the wastewater are deposited into bottom mud, the components of the bottom mud are complex, the pollution is serious, and black and odor are obvious. The traditional treatment technology needs to convey the bottom mud to a bottom mud treatment yard through a pipeline or a tank truck for post-treatment, and has the problems of large bottom mud conveying amount, long distance, high cost and the like. In addition, the bed mud with high water content, low strength and high gravel content is dried naturally by a yard and dried by manual intervention, so that the bed mud is long in drying time and low in efficiency and can generate stink by breeding bacteria; the common high-pressure filter pressing mode is used for dehydrating the bottom mud, so that the equipment loss is large, the service life is short, the blockage is easy, and the treatment effect is difficult to achieve the purpose that the water content is reduced to 50%; and the filter pressing residual water has high pollutant content, large amount and large treatment difficulty. In addition, a large amount of bottom mud is piled up to occupy a large amount of land resources, and environmental pollution is easily caused.
The prior art has the following disadvantages in treating bottom mud: (1) in the traditional treatment technology, the bottom mud is conveyed to a bottom mud treatment yard through a pipeline or a tank car for post-treatment, so that the problems of large bottom mud conveying amount, long distance, high cost and the like exist; (2) the bed sludge is dried for a long time and has low efficiency, so that the bed sludge is stink due to bacteria breeding, and a large amount of land resources are occupied; (3) the common high-pressure filter pressing mode is used for dehydrating the bottom mud, the equipment loss is large, the service life is short, the blockage is easy, and the treatment effect is difficult to achieve that the water content is reduced to 50 percent.
Therefore, how to realize the in-situ rapid reduction and harmless treatment of the polluted bottom sediment, avoiding and reducing the transportation of the bottom sediment, the treatment capacity and the treatment difficulty of the residual water, prolonging the service life of equipment, reducing the treatment cost of the bottom sediment and reducing the occupation of the bottom sediment stockpiled land is a major problem to be solved in the prior river channel dredging treatment.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems existing in the prior art, the utility model aims to solve the problems of the prior art and the pollution bottom mud generated by dredging engineering for treating black and odorous water, rivers, lakes and reservoirs, and the like, and the utility model aims to provide a treatment system and a treatment method for drying the pollution bottom mud.
The utility model adopts the technical proposal that:
a processing system for drying polluted bottom mud comprises a sand-gravel garbage separating device, a bottom mud concentrating device, an automatic dosing device, a sludge tank, a bottom mud dehydrating device, a residual water processing device and a dried sludge conveying device; wherein, grit rubbish separator, bed mud enrichment facility, sludge impoundment and bed mud dewatering device link to each other in proper order, and bed mud dewatering device links to each other with surplus water treatment facilities and mummification mud conveyor respectively, and automatic reagent feeding device links to each other with bed mud enrichment facility and bed mud dewatering device respectively.
Preferably, in the treatment system for drying the polluted bottom mud, the sand-stone garbage separation device is a vibrating screen; further preferably, the sand-stone garbage separating device is a vibrating screen with the screen size of 60-250 meshes.
Preferably, in the contaminated sediment drying treatment system, the sediment concentration device is a centrifugal concentrator.
Preferably, in the treatment system for drying the polluted bottom mud, the bottom mud dehydration device comprises a flocculation mixing tank, a stacked screw type dehydrator, a liquid collecting tank and an automatic control cabinet; the flocculation mixing tank is connected with the stacked screw type dehydrator, a liquid collecting tank is arranged below the stacked screw type dehydrator, and the automatic control cabinet is respectively connected with the flocculation mixing tank and the stacked screw type dehydrator.
Preferably, in the sediment dewatering device of the treatment system for drying the polluted sediment, the flocculation mixing tank is connected with the sludge tank, the screw-type dewatering machine is connected with the dried sludge conveying device, and the liquid collecting tank is connected with the residual water treatment device.
Preferably, in the sediment dewatering device of the treatment system for drying the polluted sediment, the stacked screw type dewatering machine comprises a screw pushing shaft, a fixing ring, a movable ring and a back pressure plate, a self-cleaning spraying device is arranged above the stacked screw type dewatering machine, a liquid collecting tank is arranged below the stacked screw type dewatering machine, side covers are arranged on two sides of the stacked screw type dewatering machine, and a dried sludge conveying device is arranged at a discharge end of the stacked screw type dewatering machine; the fixed ring and the movable ring in the stacked screw type dehydrator are mutually stacked.
Preferably, in the sediment dewatering device of the treatment system for drying the polluted sediment, a stirrer is arranged in the flocculation mixing tank, and a drain pipe controlled by a spherical valve is arranged below the flocculation mixing tank.
Preferably, in the treatment system for drying the polluted bottom mud, the dried sludge conveying device is a shaftless screw conveyor.
Preferably, in the treatment system for drying the polluted bottom sludge, the automatic dosing device comprises a flocculation curing reagent dosing device and an oxidation reagent dosing device, and the flocculation curing reagent dosing device and the oxidation reagent dosing device are respectively connected with the sludge tank.
Preferably, in the treatment system for drying the polluted bottom mud, a flocculation curing reagent dosing device in the automatic dosing device is connected with a flocculation mixing tank in the bottom mud dewatering device.
Preferably, the processing system for drying the polluted bottom mud adopts a modular design, and all components of the processing system can be freely disassembled or assembled.
The utility model has the advantages that:
through using the utility model discloses a processing system can realize polluting the integration processing that sediment original place fast drying, sediment go black deodorization and residual water were handled, reaches the purpose that pollutes sediment minimizing and innoxious to reduce sediment transportation and residual water handling capacity and the processing degree of difficulty, extension equipment life effectively reduces sediment treatment cost, avoids secondary pollution.
Drawings
FIG. 1 is a schematic view of a contaminated substrate sludge drying treatment system.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The devices or reagents used in the examples are commercially available in a conventional manner unless otherwise specified. The term "connected" or "connection" between the devices/apparatuses in the embodiments refers to the connection through pipes, pipelines or pumps. The water content and the solid content described in the examples refer to mass contents.
FIG. 1 is a schematic diagram of a contaminated substrate sludge drying treatment system. In the figure 1, 1-a sand-gravel garbage separation device, 2-a bottom sludge concentration device, 3-an automatic dosing device, 4-a sludge tank, 5-a bottom sludge dehydration device, 6-a residual water treatment device, 7-a dried sludge conveying device, 31-a flocculation curing reagent dosing device, 32-an oxidation reagent dosing device, 51-a flocculation mixing tank, 52-a stacked screw type dehydrator, 53-a liquid collecting tank, 54-an automatic control cabinet, 101-a sludge pump, 102-a material pump, 103-a sludge pump, 104-a material pump, 105-a sludge pump and 106-a water pump.
The embodiment of the treatment system for drying the polluted bottom mud of the utility model is further explained by combining with the figure 1, and the treatment system comprises a sand-gravel garbage separation device 1, a bottom mud concentration device 2, an automatic medicine feeding device 3, a sludge tank 4, a bottom mud dehydration device 5, a residual water treatment device 6 and a dried sludge conveying device 7; wherein, grit rubbish separator 1, bed mud enrichment facility 2, sludge impoundment 3 and bed mud dewatering device 5 link to each other in proper order, and bed mud dewatering device 5 links to each other with surplus water treatment facilities 6 and mummification mud conveyor 7 respectively, and automatic reagent feeding device 3 links to each other with bed mud enrichment facility 2 and bed mud dewatering device 5 respectively.
In this processing system example that pollutes sediment mummification, grit rubbish separator 1 is the shale shaker of screen cloth size 60 ~ 250 meshes, and this kind of shale shaker is the high frequency vibration sieve, sieves rubbish and the bold gravel in the sediment through the high frequency vibration sieve and removes, prevents that debris from blockking up the sludge pump, destroys follow-up processing apparatus.
The bottom mud concentrating device 2 is a centrifugal concentrator, and the bottom mud is concentrated by the centrifugal concentrator, so that the solid content of the bottom mud can be improved from 2% to 3% -8%.
The automatic dosing device 3 comprises a flocculation solidification reagent dosing device 31 and an oxidation reagent dosing device 32, and the flocculation solidification reagent dosing device 31 and the oxidation reagent dosing device 32 are respectively connected with the sludge tank. The flocculation curing reagent dosing device 31 is used for dosing a flocculating agent (polymeric ferric sulfate, polymeric aluminum sulfate, polymeric ferric aluminum or polyacrylamide) and a curing/stabilizing reagent (cement curing agent and lime curing agent), and can immobilize heavy metal pollutants in the bottom mud and flocculate the heavy metal pollutants; the oxidizing reagent dosing device 32 is used for dosing hydrogen peroxide with strong oxidizing property, so that black and odor of the polluted bottom sludge can be effectively removed, harmless treatment of the polluted bottom sludge is realized, and the treatment difficulty and treatment cost of residual water are reduced.
The bottom sediment dehydration device 5 comprises a flocculation mixing tank 51, a stacked screw type dehydrator 52, a liquid collecting tank 53 and an automatic control cabinet 54; the flocculation mixing tank 51 is connected with the stacked screw type dehydrator 52, a liquid collecting tank 53 is arranged below the stacked screw type dehydrator 52, and an automatic control cabinet 54 is respectively connected with the flocculation mixing tank 51 and the stacked screw type dehydrator 52. The flocculation mixing tank 51 is connected with the sludge tank 4, the screw-stacked dewaterer 52 is connected with the dried sludge conveying device 7, and the liquid collecting tank 53 is connected with the residual water treatment device 6. The dried sludge conveying device 7 is a shaftless screw conveyor.
The stacked screw type dehydrator 52 comprises a screw pushing shaft, a fixing ring, a moving ring and a back pressure plate, a self-cleaning spraying device is arranged above the stacked screw type dehydrator, a liquid collecting tank is arranged below the stacked screw type dehydrator, side covers are arranged on two sides of the stacked screw type dehydrator, and a dried sludge conveying device is arranged at a discharge end of the stacked screw type dehydrator; the fixed ring and the movable ring in the stacked screw type dehydrator are mutually stacked. The spiral pushing shaft, the fixing ring and the moving ring are made of super-hard wear-resistant alloy materials, so that the wear resistance of the stacked spiral dehydrator is improved, the service life of equipment is prolonged, and the device is more suitable for dehydration and drying treatment of polluted bottom mud in a river channel. The polluted bottom mud moves from the concentration section to the dehydration section of the spiral-stacked dehydrator under the action of the spiral pushing shaft, the fixed ring and the moving ring, and is discharged in the form of mud cakes at the discharge end.
The flocculation and solidification reagent adding device 31 is connected with the flocculation and mixing tank 51, and is used for further strengthening flocculation and solidification by adding a flocculating agent and a solidifying agent. A variable frequency stirrer is arranged in the flocculation mixing tank 51, and a drain pipe controlled by a spherical valve is arranged below the flocculation mixing tank. The variable frequency stirrer can design and adjust the stirring speed according to the process parameters, so that the bottom sludge is fully contacted with the flocculating agent to form a large amount of alum flocs with proper size; the blow-off pipe controlled by the spherical valve is normally closed and is opened only when the spraying device of the laminated screw type dehydrator starts to self-clean, so that the blow-off pipe is used for discharging the washing water to the liquid collecting tank; preferably, the self-cleaning process does not need to be stopped and recorded, and the filter-pressing residual water collected in the liquid collecting tank can be used as self-cleaning water, so that a cleaning water source can be saved, and the treatment burden of a residual water treatment system is reduced.
The sand-stone garbage separating device of the treatment system for drying the polluted bottom mud can be connected with a dredging ship or a dredging vehicle through a mud pipe.
All the components are connected with each other through a pump and a pipeline: be equipped with sludge pump 101 between grit rubbish separator 1 and the sediment enrichment facility 2, be equipped with material pump 102 between automatic reagent feeding device 3 and the sediment enrichment facility 2, be equipped with sludge pump 103 between sediment enrichment facility 2 and the sludge impoundment 4, be equipped with material pump 104 between flocculation curing agent charge device 31 and the flocculation mixing tank 51, be equipped with sludge pump 105 between sludge impoundment 4 and the flocculation mixing tank 51, be equipped with water pump 106 between collecting tank 53 and the surplus water treatment facilities 6.
The treatment system for drying the polluted bottom mud adopts a modularized and automatic design, each component device of the system can be disassembled, can be arranged on an environment-friendly dredging ship or a dredging vehicle and is connected with dredging equipment, the integrated treatment of dredging and dredging-bottom mud drying is realized on the engineering, and the engineering applicability is strong.
The application of the treatment system of the present invention is further illustrated by the following specific application examples.
Example 1
The environment-friendly dredging vehicle is adopted to carry out dredging, dredging and governing on black and odorous river channels in a certain city, the polluted bottom sediment drying treatment system is installed behind the sludge suction device of the dredging vehicle, and referring to fig. 1, the sand-stone garbage separation device, the bottom sediment concentration device, the sludge tank, the automatic chemical feeding device, the bottom sediment dehydration device, the residual water treatment device and the dried sludge conveying device are sequentially arranged according to the bottom sediment treatment sequence.
A sludge discharge pipe of the dredging vehicle is connected with a feed inlet of a high-frequency vibrating screen 1, gravels and garbage in the bottom sludge are separated out under the action of the high-frequency vibrating screen and transported out, and the bottom sludge with the water content of 98.6 percent (namely the solid content of 1.4 percent) below the screen and the particle size of 60-250 meshes is sent into a centrifugal thickener 2 through a sludge pump. A flocculating and solidifying agent dosing device 31 is used for adding a flocculating agent and a solidifying/stabilizing agent to solidify and stabilize pollutants such as heavy metals in the bottom mud and accelerate the concentration treatment speed of the bottom mud; hydrogen peroxide is added by an oxidizing reagent feeding device 32 to carry out strong oxidation treatment on bacteria, viruses and organic pollutants in the bottom sludge, and black and odor can be rapidly removed. Concentrated supernatant is directly discharged into a river channel, the water content of lower-layer precipitated sludge is reduced to 93.2 percent (namely, the solid content is 6.8 percent), the lower-layer precipitated sludge is conveyed to a sludge tank 4 by a sludge pump 103 for temporary storage, simultaneously, bottom sludge in the sludge tank 4 is conveyed to a flocculation mixing tank 51 by a sludge pump 105 for further flocculation and immobilization treatment, then the bottom sludge enters a stacked screw type dehydrator 52 for dehydration and drying, and finally the obtained sludge cake is discharged by a shaftless screw conveyor 7. The filter pressing residual water generated by dehydration and drying is collected by the liquid collecting tank 53 and is conveyed to the residual water treatment device 6 for treatment, and the standard-reaching effluent is directly discharged to a river channel.
The water content of the dried dredged sediment obtained by the embodiment is 53-56% and has no black odor, and the treated residual water reaches the first-class A standard of pollutant discharge Standard of municipal wastewater treatment plant (GB 18918-.
Example 2
The environment-friendly dredging boat is adopted to carry out dredging, dredging and governing on a certain lake in a city, the efficient drying treatment system for the polluted bottom sediment is installed on the dredging boat, and referring to fig. 1, the sand-stone garbage separation device, the bottom sediment concentration device, the sludge tank, the automatic chemical feeding device, the bottom sediment dehydration device, the residual water treatment device and the dried sludge conveying device are sequentially arranged according to the bottom sediment treatment sequence.
A sludge discharge pipe of the dredging ship is connected with a feed inlet of a high-frequency vibrating screen 1, gravels and garbage in the bottom sludge are separated out under the action of the high-frequency vibrating screen and transported out for treatment, and the bottom sludge with the water content of 99 percent (namely solid content of 1 percent) below the screen and the particle size of 60-250 meshes is sent into a centrifugal thickener 2 through a sludge pump. A flocculating and solidifying agent dosing device 31 is used for adding a flocculating agent and a solidifying/stabilizing agent to solidify and stabilize pollutants such as heavy metals in the bottom mud and accelerate the concentration treatment speed of the bottom mud; hydrogen peroxide is added by an oxidizing reagent feeding device 32 to carry out strong oxidation treatment on bacteria, viruses and organic pollutants in the bottom sludge, and black and odor can be rapidly removed. Concentrated supernatant is directly discharged into a river channel, the water content of lower-layer precipitated sludge is reduced to 94.8 percent (namely, the solid content is 5.2 percent), the lower-layer precipitated sludge is conveyed to a sludge tank 4 by a sludge pump 103 for temporary storage, simultaneously, bottom sludge in the sludge tank 4 is conveyed to a flocculation mixing tank 51 by a sludge pump 105 for further flocculation and immobilization treatment, then the bottom sludge enters a stacked screw type dehydrator 52 for dehydration and drying, and finally the obtained sludge cake is discharged by a shaftless screw conveyor 7. The filter pressing residual water generated by dehydration and drying is collected by the liquid collecting tank 53 and is conveyed to the residual water treatment device 6 for treatment, and the standard-reaching effluent is directly discharged to a river channel.
The water content of the dried dredged sediment obtained by the embodiment is 55-58%, the dried dredged sediment is free from black and odorous, and the treated residual water reaches the first-class A standard of pollutant discharge Standard of urban Sewage treatment plant (GB 18918-.
According to the implementation, the utility model discloses a sediment concentration preliminary treatment, high-efficient spiral shell machine dehydration and the surplus water treatment of folding combine together, have realized the integration of dredging sediment original place fast drying, sediment black deodorization and surplus water treatment and have handled, reach dredging sediment minimizing and innoxious purpose, effectively reduce sediment treatment cost, avoid secondary pollution, the device removes conveniently, and engineering suitability is strong.
Compared with the prior art, use the utility model discloses a device pollutes the sediment mummification, has following advantage:
1. the flocculating agent is added in the concentration process, so that the concentration speed of the bottom mud can be increased, and the concentration effect of the bottom mud is improved; and a flocculating agent is added in the filter pressing process to strengthen the flocculation effect of the bottom sludge, the solid content of the polluted bottom sludge after drying treatment can reach 40-50%, the volume of the bottom sludge is reduced by 40-50 times, the transportation amount and the transportation cost of the bottom sludge are reduced, and the land occupied by the bottom sludge stacking is reduced.
2. The heavy metal pollutants in the bottom mud can be immobilized by adding a curing/stabilizing agent; the hydrogen peroxide with strong oxidizing property effectively removes black and odor of the polluted bottom mud, realizes harmless treatment of the polluted bottom mud, and reduces the treatment difficulty and treatment cost of residual water.
3. The adopted spiral-wound dehydrator realizes a continuous self-cleaning process by virtue of the movement between the fixed ring and the movable ring, so that the problems of blockage and shutdown cleaning are avoided; the spiral pushing shaft, the fixing ring and the moving ring of the stacked spiral dehydrator are made of superhard wear-resistant alloy materials, so that the stacked spiral dehydrator is more suitable for drying treatment of river and lake bottom mud with high grit content, and has long service life.
4. The drying system for the polluted bottom mud adopts a modularized and automatic design, each device of the system is detachable, can be mounted on an environment-friendly dredging ship or a dredging vehicle and is connected with dredging equipment, dredging and dredging-bottom mud drying integrated treatment is realized in engineering, and the engineering applicability is strong.
Claims (8)
1. A processing system for drying polluted bottom mud is characterized in that: comprises a sand-stone garbage separating device, a bottom sediment concentrating device, an automatic dosing device, a sludge tank, a bottom sediment dehydrating device, a residual water treating device and a dried sludge conveying device; grit waste separation device, bed mud enrichment facility, sludge impoundment and bed mud dewatering device link to each other in proper order, bed mud dewatering device links to each other with surplus water treatment facilities and mummification mud conveyor respectively, automatic reagent feeding device links to each other with bed mud enrichment facility and bed mud dewatering device respectively.
2. A contaminated substrate sludge drying treatment system according to claim 1, further comprising: the sand-stone garbage separating device is a vibrating screen.
3. A contaminated substrate sludge drying treatment system according to claim 1, further comprising: the bottom mud concentrating device is a centrifugal concentrator.
4. A contaminated substrate sludge drying treatment system according to claim 1, further comprising: the bottom mud dehydration device comprises a flocculation mixing tank, a stacked screw type dehydrator, a liquid collecting tank and an automatic control cabinet; the flocculation mixing tank is connected with the stacked screw type dehydrator, a liquid collecting tank is arranged below the stacked screw type dehydrator, and the automatic control cabinet is respectively connected with the flocculation mixing tank and the stacked screw type dehydrator.
5. A contaminated substrate sludge drying treatment system according to claim 4, further comprising: in the bottom sludge dewatering device, a flocculation mixing tank is connected with a sludge tank, a stacked screw type dewatering machine is connected with a dried sludge conveying device, and a liquid collecting tank is connected with a residual water treatment device.
6. A contaminated substrate sludge drying treatment system according to claim 1, further comprising: the automatic dosing device comprises a flocculation solidification reagent dosing device and an oxidation reagent dosing device, and the flocculation solidification reagent dosing device and the oxidation reagent dosing device are respectively connected with the sludge tank.
7. A contaminated substrate drying treatment system according to claim 5 or 6, wherein: and a flocculation curing reagent dosing device in the automatic dosing device is connected with a flocculation mixing tank in the bottom mud dewatering device.
8. A contaminated substrate drying treatment system according to claim 1 or 5, wherein: the dried sludge conveying device is a shaftless screw conveyor.
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| CN201822245922.5U CN209890472U (en) | 2018-12-27 | 2018-12-27 | Contaminated bottom mud drying treatment system |
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| CN201822245922.5U CN209890472U (en) | 2018-12-27 | 2018-12-27 | Contaminated bottom mud drying treatment system |
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