CN109851190B - Treatment system and treatment method for drying polluted bottom mud - Google Patents
Treatment system and treatment method for drying polluted bottom mud Download PDFInfo
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- CN109851190B CN109851190B CN201811613367.5A CN201811613367A CN109851190B CN 109851190 B CN109851190 B CN 109851190B CN 201811613367 A CN201811613367 A CN 201811613367A CN 109851190 B CN109851190 B CN 109851190B
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- 238000001035 drying Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000010802 sludge Substances 0.000 claims abstract description 96
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 230000018044 dehydration Effects 0.000 claims abstract description 22
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 22
- 239000010813 municipal solid waste Substances 0.000 claims abstract description 21
- 239000004576 sand Substances 0.000 claims abstract description 18
- 238000000926 separation method Methods 0.000 claims abstract description 13
- 239000013049 sediment Substances 0.000 claims description 71
- 238000005189 flocculation Methods 0.000 claims description 42
- 230000016615 flocculation Effects 0.000 claims description 40
- 238000002156 mixing Methods 0.000 claims description 26
- 239000003795 chemical substances by application Substances 0.000 claims description 23
- 239000000758 substrate Substances 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 18
- 239000008394 flocculating agent Substances 0.000 claims description 13
- 239000003153 chemical reaction reagent Substances 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 11
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical group OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 9
- 238000007254 oxidation reaction Methods 0.000 claims description 8
- 239000004575 stone Substances 0.000 claims description 8
- 230000003647 oxidation Effects 0.000 claims description 7
- 239000007800 oxidant agent Substances 0.000 claims description 6
- 239000006228 supernatant Substances 0.000 claims description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 239000000706 filtrate Substances 0.000 claims description 3
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 3
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 description 11
- 231100000719 pollutant Toxicity 0.000 description 11
- 238000004140 cleaning Methods 0.000 description 7
- 238000003825 pressing Methods 0.000 description 7
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- 229910001385 heavy metal Inorganic materials 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 3
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- 239000000428 dust Substances 0.000 description 2
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- 230000009965 odorless effect Effects 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 229940037003 alum Drugs 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- Treatment Of Sludge (AREA)
Abstract
The invention discloses a treatment system and a treatment method for drying polluted bottom mud. The treatment system for drying the polluted bottom mud comprises a sand and garbage separation device, a bottom mud concentration device, an automatic dosing device, a sludge tank, a bottom mud dehydration device, a residual water treatment device and a dried sludge conveying device. A method for treating the polluted bottom mud by using the treatment system is also disclosed. By using the treatment system provided by the invention, the integrated treatment of in-situ quick drying, black and odor removal and residual water treatment of the polluted bottom mud can be realized, the purposes of reducing and harmless the polluted bottom mud are achieved, the bottom mud transportation and residual water treatment capacity and the treatment difficulty are reduced, the service life of equipment is prolonged, the bottom mud treatment cost is effectively reduced, and secondary pollution is avoided.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a treatment system and a treatment method for drying polluted bottom sludge.
Background
Along with the development of the economy and the promotion of the urban process in China, a large amount of industrial wastewater, domestic sewage and the like generated along the town streets of the river are discharged, the river is severely polluted, the ecological system of the river is seriously destroyed, the life of residents is influenced, and the health of human bodies is endangered. At present, most of urban rivers in China have different degrees of pollution, and particularly the pollution is prominent in cities with developed industrial development. The pollutants entering the river channel are finally deposited into the sediment and gradually enriched to form polluted sediment, which is a key endogenous pollutant of the river and the lake. Dredging is a main measure for controlling the endogenous pollution of rivers and lakes at home and abroad at present, and aims to remove polluted sediment in water bodies of rivers, lakes, reduce the content of the endogenous pollutants in the rivers and lakes, improve the water quality of the rivers and lakes and improve the ecological environment of the water. Along with the development of dredging engineering of river and lake sediment, the treatment and disposal of a large amount of dredging sludge becomes a further difficult problem to be solved urgently.
Because river and lake are polluted by coastal domestic sewage, industrial wastewater and the like, pollutants in the wastewater are deposited into the bottom mud, and the bottom mud has complex components, serious pollution and obvious black and odorous effect. By adopting the traditional treatment technology, the bottom mud is conveyed to a bottom mud treatment storage yard for post-treatment through pipeline conveying or tank truck, and the problems of large bottom mud conveying amount, long distance, high cost and the like exist. In addition, the sediment with high water content, low strength and high gravel content is dried naturally by a storage yard, manually intervened and dried and the like, so that the sediment is dried for a long time and is low in efficiency, and bacteria are bred to form malodor; the common high-pressure filter pressing mode is used for dewatering the bottom mud, so that the equipment loss is large, the service life is short, the blockage is easy, and the water content is difficult to be reduced to 50% in the treatment effect; and the filter-pressing residual water has high pollutant content, large amount and large treatment difficulty. In addition, a large amount of sediment is piled up and occupies a large amount of land resources, and environmental pollution is easy to cause.
The prior art treatment of bottom mud has the following disadvantages: (1) The traditional treatment technology has the problems of large bottom mud conveying amount, long distance, high cost and the like when the bottom mud is conveyed to a bottom mud treatment storage yard for post treatment through pipeline conveying or tank truck; (2) The technology of natural drying or manual intervention drying of a storage yard is long in bed mud drying time and low in efficiency, malodor is formed by breeding bacteria, and a large amount of land resources are occupied; (3) The common high-pressure filter pressing mode is used for dewatering the sediment, so that the equipment loss is large, the service life is short, the sediment is easy to block, and the water content is difficult to be reduced to 50 percent due to the treatment effect.
Therefore, how to realize the in-situ rapid reduction and harmless treatment of the polluted sediment, avoid reducing the sediment transportation and residual water treatment capacity and treatment difficulty, prolong the service life of equipment, reduce the sediment treatment cost and reduce the sediment piling land occupation, and is a great problem to be solved in the current river dredging treatment.
Disclosure of Invention
Aiming at solving the problems in the prior art and aiming at treating polluted substrate sludge generated in dredging projects such as black and odorous water bodies, rivers, lakes and reservoirs, the invention aims to provide a treatment system and a treatment method for drying the polluted substrate sludge.
The technical scheme adopted by the invention is as follows:
a treatment system for drying polluted bottom mud comprises a sand and garbage separation device, a bottom mud concentration device, an automatic dosing device, a sludge tank, a bottom mud dehydration device, a residual water treatment device and a dried sludge conveying device; wherein, grit rubbish separator, sediment enrichment facility, sludge impoundment and sediment dewatering device link to each other in proper order, and the sediment dewatering device links to each other with surplus water treatment facilities and mummification mud conveyor respectively, and automatic medicine adding device links to each other with sediment enrichment facility and sediment dewatering device respectively.
Preferably, in the treatment system for drying the polluted bottom mud, the sand and garbage separation device is a vibrating screen; further preferably, the sand and garbage separating device is a vibrating screen with a screen size of 60-250 meshes.
Preferably, in the treatment system for drying the polluted substrate sludge, the substrate sludge concentrating 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 spiral shell stacking dehydrator, a liquid collecting tank and an automatic control cabinet; the flocculation mixing tank is connected with the spiral-pile type dehydrator, a liquid collecting tank is arranged below the spiral-pile type dehydrator, and the automatic control cabinet is respectively connected with the flocculation mixing tank and the spiral-pile type dehydrator.
Preferably, in the bottom sludge dewatering device of the polluted bottom sludge drying treatment system, the flocculation mixing tank is connected with the sludge tank, the spiral-pile 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 bottom mud dehydration device of the polluted bottom mud drying treatment system, the spiral pushing shaft, the fixed ring, the movable ring and the back pressing plate are arranged in the spiral stacking dehydrator, the self-cleaning spraying device is arranged above the spiral stacking dehydrator, the liquid collecting tank is arranged below the spiral stacking dehydrator, the side covers are arranged on two sides of the spiral stacking dehydrator, and the discharge end of the spiral stacking dehydrator is provided with a dried sludge conveying device; the fixed ring and the movable ring in the spiral shell formula hydroextractor are mutually overlapped.
Preferably, in the sediment dewatering device of the polluted sediment drying treatment system, a stirrer is arranged in the flocculation mixing tank, and a blow-down pipe controlled by a spherical valve is arranged below the flocculation mixing tank.
Preferably, in the treatment system for drying the polluted bottom sludge, 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, the flocculation curing reagent dosing device in the automatic dosing device is connected with the flocculation mixing tank in the bottom mud dehydration device.
Preferably, the treatment system for drying the polluted bottom mud adopts a modularized design, and all the constituent devices of the treatment system can be disassembled or assembled at will.
The treatment method for drying the polluted bottom mud is to treat the polluted bottom mud by using the treatment system, and comprises the following steps of:
1) Inputting the polluted sediment into a sand-stone garbage separation device, and separating the sediment from sand and garbage;
2) Inputting the separated sediment into a sediment concentration device, adding a flocculating agent, a curing agent and an oxidizing agent for treatment, discharging the supernatant after treatment, and inputting the sediment into a sludge pool;
3) Inputting bottom mud in a sludge pond into a flocculation mixing tank, adding a flocculating agent and a curing agent for treatment, inputting the treated bottom mud into a spiral-pile type dehydrator for dehydration, and inputting a mud cake obtained by dehydration into a dried sludge conveying device for discharging;
4) The filtrate obtained by dehydration is collected by a liquid collecting tank, and is input into a residual water treatment device for treatment and then discharged.
Preferably, in the step 1) of the treatment method for drying the polluted substrate sludge, the polluted substrate sludge is the polluted substrate sludge generated by optionally dredging black and odorous water bodies, rivers and lakes.
Preferably, in the step 2) and the step 3) of the treatment method for drying the polluted bottom mud, the flocculating agent is at least one selected from polymeric ferric sulfate, polymeric aluminum sulfate, polymeric ferric aluminum and polyacrylamide respectively and independently.
Preferably, in the step 2) and the step 3) of the treatment method for drying the polluted bottom mud, the curing agent is at least one of cement curing agent and lime curing agent respectively and independently.
Preferably, in the step 2) of the treatment method for drying the polluted bottom mud, the oxidizing reagent is hydrogen peroxide.
Preferably, in the step 2) of the treatment method for drying the polluted bottom mud, the solid content of the bottom mud before treatment is less than 2wt%, and the solid content of the sediment bottom mud after treatment is 3-8 wt%.
Preferably, in the step 3) of the treatment method for drying the polluted bottom mud, the treated bottom mud moves from the concentration section to the dehydration section under the action of the spiral pushing shaft, the fixed ring and the movable ring in the spiral stacking dehydrator, and is discharged in a mud cake form at the discharge end.
Preferably, in the step 3) of the treatment method for drying the polluted bottom mud, the water content of the mud cake obtained by dehydration is 50-60 wt%; further preferably, the water content of the dehydrated mud cake is 53-58 wt%.
The beneficial effects of the invention are as follows:
by using the treatment system provided by the invention, the integrated treatment of in-situ quick drying, black and odor removal and residual water treatment of the polluted bottom mud can be realized, the purposes of reducing and harmless the polluted bottom mud are achieved, the bottom mud transportation and residual water treatment capacity and the treatment difficulty are reduced, the service life of equipment is prolonged, the bottom mud treatment cost is effectively reduced, and secondary pollution is avoided.
Drawings
FIG. 1 is a schematic diagram of a contaminated sediment drying treatment system.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The apparatus or reagents used in the examples are commercially available from conventional sources unless otherwise specified. The terms "connected," "connected," or "connected" between the devices/apparatuses described in the embodiments refer to connection by pipes, lines, or pumps. The water content and the solid content in the examples refer to mass content.
FIG. 1 is a schematic diagram of a contaminated sediment drying treatment system. In FIG. 1, 1-sand and stone garbage separating device, 2-sediment concentrating device, 3-automatic dosing device, 4-sludge tank, 5-sediment dewatering device, 6-residual water treatment device, 7-desiccated sludge conveying device, 31-flocculation curing agent dosing device, 32-oxidation agent dosing device, 51-flocculation mixing tank, 52-spiral shell formula hydroextractor, 53-collecting tank, 54-automatic control cabinet, 101-sludge pump, 102-material pump, 103-sludge pump, 104-material pump, 105-sludge pump, 106-water pump.
An embodiment of the treatment system for drying polluted bottom sludge of the present invention is further described below with reference to fig. 1, and the treatment system comprises a sand and garbage separation device 1, a bottom sludge concentration device 2, an automatic dosing device 3, a sludge tank 4, a bottom sludge dewatering 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 desiccation mud conveyor 7 respectively, and automatic dosing device 3 links to each other with bed mud enrichment facility 2 and bed mud dewatering device 5 respectively.
In the example of the treatment system for drying polluted bottom mud, the sand and dust separation device 1 is a vibrating screen with the screen size of 60-250 meshes, the vibrating screen is a high-frequency vibrating screen, garbage and massive gravels in the bottom mud are screened out by the high-frequency vibrating screen, and sundries are prevented from blocking a sludge pump to damage a subsequent treatment device.
The sediment concentration device 2 is a centrifugal concentrator, and the sediment is concentrated by the centrifugal concentrator, so that the solid content of the sediment can be improved from <2% to 3% -8%.
The automatic dosing device 3 comprises a flocculation curing agent dosing device 31 and an oxidation agent dosing device 32, and the flocculation curing agent dosing device 31 and the oxidation agent dosing device 32 are respectively connected with the sludge pond. The flocculation curing agent adding device 31 is used for adding flocculating agents (polymeric ferric sulfate, polymeric aluminum sulfate, polymeric ferric aluminum or polyacrylamide) and curing/stabilizing agents (cement curing agents and lime curing agents) to fix and flocculate heavy metal pollutants in the bottom sludge; the oxidizing agent dosing device 32 is used for dosing hydrogen peroxide with strong oxidizing property, so that the black and odorous pollution of the substrate sludge can be effectively removed, the harmless treatment of the pollution substrate sludge is realized, and the treatment difficulty and the treatment cost of residual water are reduced.
The bottom mud dewatering device 5 comprises a flocculation mixing tank 51, a spiral shell-type dewatering machine 52, a liquid collecting tank 53 and an automatic control cabinet 54; the flocculation mixing tank 51 is connected with the spiral shell formula hydroextractor 52, a liquid collecting tank 53 is arranged below the spiral shell formula hydroextractor 52, and an automatic control cabinet 54 is respectively connected with the flocculation mixing tank 51 and the spiral shell formula hydroextractor 52. The flocculation mixing tank 51 is connected with the sludge tank 4, the spiral-pile dehydrator 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 spiral-type dehydrator 52 comprises a spiral pushing shaft, a fixed ring, a movable ring and a back pressing plate, a self-cleaning spraying device is arranged above the spiral-type dehydrator, a liquid collecting tank is arranged below the spiral-type dehydrator, side covers are arranged on two sides of the spiral-type dehydrator, and a discharge end of the spiral-type dehydrator is provided with a dried sludge conveying device; the fixed ring and the movable ring in the spiral shell formula hydroextractor are mutually overlapped. The spiral pushing shaft, the fixed ring and the movable ring are made of superhard wear-resistant alloy materials, so that the wear resistance of the spiral-on-spiral dehydrator is improved, the service life of equipment is prolonged, and the spiral-on-spiral-type dehydrator is more suitable for dehydration and drying treatment of river pollution substrate sludge. The polluted bottom mud moves from the concentrating section to the dewatering section of the spiral stack type dewatering machine under the action of the spiral pushing shaft, the fixed ring and the movable ring, and is discharged in the form of mud cakes at the discharging end.
The flocculation curing agent dosing device 31 is connected with the flocculation mixing tank 51, and further enhances flocculation curing by adding a flocculant and a curing agent. A variable frequency stirrer is arranged in the flocculation mixing tank 51, and a blow-down pipe controlled by a ball valve is arranged below the flocculation mixing tank. The variable frequency mixer can be designed and adjusted to stir the rotational speed according to the technological parameter, make the bottom mud fully contact with flocculating agent, form a large number of alum flowers with suitable size; the drain pipe controlled by the ball valve is normally closed and is opened only when the spray device of the spiral shell-like dehydrator starts self-cleaning and is used for discharging washing water to the liquid collecting tank; preferably, the self-cleaning process does not need to be stopped for remembering, and the filter-pressing residual water collected in the liquid collecting tank can be used as self-cleaning water, so that a clean water source can be saved, and the treatment burden of a residual water treatment system can be reduced.
The sand and garbage separation device of the polluted bottom sludge drying treatment system can be connected with a dredging ship or a dredging vehicle through a sludge discharge pipe.
All the component devices are connected with each other through a pump and a pipeline: a sludge pump 101 is arranged between the sand and dust separation device 1 and the bottom mud concentration device 2, a material pump 102 is arranged between the automatic dosing device 3 and the bottom mud concentration device 2, a sludge pump 103 is arranged between the bottom mud concentration device 2 and the sludge tank 4, a material pump 104 is arranged between the flocculation curing reagent dosing device 31 and the flocculation mixing tank 51, a sludge pump 105 is arranged between the sludge tank 4 and the flocculation mixing tank 51, and a water pump 106 is arranged between the liquid collecting tank 53 and the residual water treatment device 6.
The treatment system for drying the polluted sediment adopts modularized and automatic design, and each component device of the system is detachable and can be installed on an environment-friendly dredging ship or a dredging vehicle to be connected with dredging equipment, so that dredging-sediment drying integrated treatment is realized on engineering, and the engineering applicability is strong.
The method for drying the polluted bottom mud by using the treatment system of the invention is further described below through specific application examples.
Example 1
The environment-friendly dredging vehicle is used for dredging and managing black and odorous riverway in a certain city, and a polluted substrate sludge drying treatment system is arranged behind a sludge suction device of the dredging vehicle, and is sequentially provided with a sand and stone garbage separation device, a substrate sludge concentration device, a sludge pond, an automatic dosing device, a substrate sludge dewatering device, a residual water treatment device and a dried sludge conveying device according to a substrate sludge treatment sequence with reference to FIG. 1.
The mud discharging pipe of the dredging vehicle is connected with the feed inlet of the high-frequency vibrating screen 1, sand and stones and garbage in the sediment are separated out through the action of the high-frequency vibrating screen and are transported to the outside for treatment, and the sediment with the water content under the screen of 98.6 percent (namely, the solid content of 1.4 percent) and the grain diameter of 60-250 meshes is sent into the centrifugal concentrator 2 through the sludge pump. The flocculating agent and solidifying/stabilizing agent are added by the flocculating agent solidifying agent adding device 31 to solidify and stabilize the pollutants such as heavy metal in the bottom mud, and the concentration treatment speed of the bottom mud is accelerated; oxydol is added by the oxidizing agent dosing device 32 to carry out strong oxidation treatment on bacteria, viruses and organic pollutants in the substrate sludge, and black and odor are removed rapidly. The concentrated supernatant fluid is directly discharged into a river channel, the water content of the sediment sludge at the lower layer is reduced to 93.2 percent (namely, the solid content is 6.8 percent), the sediment sludge is conveyed to a sludge tank 4 for temporary storage by a sludge pump 103, meanwhile, the sediment sludge in the sludge tank 4 is conveyed to a flocculation mixing tank 51 for further flocculation and immobilization treatment by a sludge pump 105, and then enters a spiral-pile dehydrator 52 for dehydration and drying, and finally, the obtained mud cake is discharged by a shaftless spiral conveyor 7. The filter-pressed residual water generated by dehydration and drying is collected by a liquid collecting tank 53 and is conveyed to a residual water treatment device 6 for treatment, and the water reaching the standard is directly discharged into a river channel.
The water content of the dried dredging sediment obtained in the embodiment is 53-56%, no black and odorless, and the residual water after treatment reaches the first grade A standard of pollutant emission Standard of urban wastewater treatment plant (GB 18918-2002).
Example 2
An environment-friendly dredging ship is adopted to dredge and dredge a lake in a city, an efficient polluted sediment drying treatment system is arranged on the dredging ship, and a sand and stone garbage separation device, a sediment concentration device, a sludge pond, an automatic dosing device, a sediment dehydration device, a residual water treatment device and a dried sludge conveying device are sequentially arranged according to a sediment treatment sequence with reference to FIG. 1.
The mud discharging pipe of the dredging ship is connected with the feed inlet of the high-frequency vibrating screen 1, sand and stones and garbage in the sediment are separated out through the action of the high-frequency vibrating screen and are transported to the outside for treatment, and the sediment with the water content of 99 percent (namely, the solid content of 1 percent) and the grain size of 60-250 meshes under the screen is sent into the centrifugal concentrator 2 through the sludge pump. The flocculating agent and solidifying/stabilizing agent are added by the flocculating agent solidifying agent adding device 31 to solidify and stabilize the pollutants such as heavy metal in the bottom mud, and the concentration treatment speed of the bottom mud is accelerated; oxydol is added by the oxidizing agent dosing device 32 to carry out strong oxidation treatment on bacteria, viruses and organic pollutants in the substrate sludge, and black and odor are removed rapidly. The concentrated supernatant fluid is directly discharged into a river channel, the water content of the sediment sludge at the lower layer is reduced to 94.8 percent (namely, the solid content is 5.2 percent), the sediment sludge is conveyed to a sludge tank 4 for temporary storage by a sludge pump 103, meanwhile, the sediment sludge in the sludge tank 4 is conveyed to a flocculation mixing tank 51 for further flocculation and immobilization treatment by a sludge pump 105, and then enters a spiral-pile dehydrator 52 for dehydration and drying, and finally, the obtained mud cake is discharged by a shaftless spiral conveyor 7. The filter-pressed residual water generated by dehydration and drying is collected by a liquid collecting tank 53 and is conveyed to a residual water treatment device 6 for treatment, and the water reaching the standard is directly discharged into a river channel.
The water content of the dried dredging sediment obtained in the embodiment is 55-58%, no black and odorless, and the residual water after treatment reaches the first grade A standard of pollutant emission Standard of urban wastewater treatment plant (GB 18918-2002).
According to the implementation, the integrated treatment of the in-situ quick drying of the dredged sediment, the black and odor removal of the sediment and the residual water treatment is realized by combining the sediment concentration pretreatment, the high-efficiency spiral shell stacking machine dehydration and the residual water treatment, the purposes of reducing and harmlessly treating the dredged sediment are achieved, the sediment treatment cost is effectively reduced, the secondary pollution is avoided, the device is convenient to move, and the engineering applicability is strong.
Compared with the prior art, the device for drying the polluted bottom mud has the following advantages:
1. the flocculation reagent is added in the concentration process, so that the concentration speed of the bottom mud can be increased, and the bottom mud concentration effect is improved; the flocculating agent is added in the filter pressing process to strengthen the flocculation effect of the bottom mud, the solid content of the polluted bottom mud after the drying treatment can reach 40-50%, the volume of the bottom mud is reduced by 40-50 times, the transportation quantity and the transportation cost of the bottom mud are reduced, and the land occupied by the bottom mud piling is reduced.
2. The heavy metal pollutants in the bottom mud can be immobilized by adding the solidifying/stabilizing agent; the hydrogen peroxide with strong oxidizing property effectively removes the black and odorous pollution of the substrate sludge, realizes the harmless treatment of the pollution substrate sludge, and reduces the treatment difficulty and the treatment cost of residual water.
3. The adopted spiral-stack dehydrator realizes a continuous self-cleaning process by virtue of the movement between the fixed ring and the movable ring, thereby avoiding the blockage problem and the shutdown cleaning problem; the spiral pushing shaft, the fixed ring and the movable ring of the spiral-pile dehydrator are made of superhard wear-resistant alloy materials, so that the spiral-pile dehydrator is more suitable for drying river and lake sediment with high gravel content, and the equipment has long service life.
4. The polluted sediment drying system adopts modularized and automatic design, each device of the system is detachable, can be installed on an environment-friendly dredging ship or a dredging vehicle, is connected with dredging equipment, realizes dredging-sediment drying integrated treatment on engineering, and has strong engineering applicability.
Claims (1)
1. A method for treating pollution bottom mud drying is characterized by comprising the following steps: the method for treating the polluted bottom mud by using the polluted bottom mud drying treatment system comprises the following steps:
1) Inputting the polluted sediment into a sand-stone garbage separation device, and separating the sediment from sand and garbage;
2) Inputting the separated sediment into a sediment concentration device, adding a flocculating agent, a curing agent and an oxidizing agent for treatment, discharging the supernatant after treatment, and inputting the sediment into a sludge pool;
3) Inputting bottom mud in a sludge pond into a flocculation mixing tank, adding a flocculating agent and a curing agent for treatment, inputting the treated bottom mud into a spiral-pile type dehydrator for dehydration, and inputting a mud cake obtained by dehydration into a dried sludge conveying device for discharging;
4) Collecting the filtrate obtained by dehydration through a liquid collecting tank, inputting the filtrate into a residual water treatment device for treatment, and discharging;
in the step 1), the polluted substrate sludge is the polluted substrate sludge generated by optionally dredging black and odorous water bodies, rivers and lakes;
in the step 2) and the step 3), the flocculating agent is at least one of polymeric ferric sulfate, polymeric aluminum sulfate, polymeric ferric aluminum and polyacrylamide respectively and independently;
in the step 2) and the step 3), the curing agents are respectively and independently selected from at least one of cement curing agents and lime curing agents;
in the step 2), the oxidizing agent is hydrogen peroxide;
in the step 2), the solid content of the sediment before treatment is less than 2wt percent, and the solid content of the sediment after treatment is 3-8 wt percent;
in the step 3), the water content of the mud cake obtained by dehydration is 50-60 wt%;
the treatment system for drying the polluted bottom mud comprises a sand and garbage separation device, a bottom mud concentration device, an automatic dosing device, a sludge tank, a bottom mud dehydration device, a residual water treatment device and a dried sludge conveying device; the sand and stone garbage separating device, the sediment concentrating device, the sludge pond and the sediment dewatering device are sequentially connected, the sediment dewatering device is respectively connected with the residual water treatment device and the dried sludge conveying device, and the automatic dosing device is respectively connected with the sediment concentrating device and the sediment dewatering device;
the sand and garbage separation device is a vibrating screen with the screen size of 60-250 meshes; the bottom mud concentration device is a centrifugal concentrator;
the bottom mud dewatering device comprises a flocculation mixing tank, a spiral-pile type dewatering machine, a liquid collecting tank and an automatic control cabinet; the flocculation mixing tank is connected with the spiral-pile type dehydrator, a liquid collecting tank is arranged below the spiral-pile type dehydrator, and the automatic control cabinet is respectively connected with the flocculation mixing tank and the spiral-pile type dehydrator; in the bottom sludge dewatering device, a flocculation mixing tank is connected with a sludge pond, a spiral stack type dewatering machine is connected with a dried sludge conveying device, and a liquid collecting tank is connected with a residual water treatment device;
the automatic dosing device comprises a flocculation curing reagent dosing device and an oxidation reagent dosing device; the flocculation curing reagent dosing device in the automatic dosing device is connected with the flocculation mixing tank in the bottom mud dewatering device.
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| CN110255840A (en) * | 2019-07-19 | 2019-09-20 | 哈尔滨工业大学水资源国家工程研究中心有限公司 | A kind of novel water course/lake sludge curing system and sludge curing method |
| CN111333282B (en) * | 2020-02-09 | 2022-04-12 | 中日友好环境保护中心(生态环境部环境发展中心) | Rural black and odorous water body sediment treatment system and method |
| CN113480116A (en) * | 2021-07-20 | 2021-10-08 | 深圳市市政工程总公司 | Dredged sediment solidification modification drying method |
| CN113480118A (en) * | 2021-07-23 | 2021-10-08 | 深圳市市政工程总公司 | Dredged sediment solidification modification method |
| CN115448570B (en) * | 2022-09-13 | 2024-08-20 | 温州市环境发展有限公司 | Fly ash leachate sludge treatment system |
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