Intensive treatment system and process for small-volume river and lake sludge

Abstract

The present invention discloses a system and process for intensively treating small-volume river and lake sludge. The sludge screening system is connected to the sludge concentration and dehydration system through a first pipeline, and the first pipeline is sequentially connected with a first screw pump, a flocculant preparation device and a pipeline mixer; the sludge concentration and dehydration tank body is sequentially provided with impermeable concentration geotextile bags, sludge dehydration geotextile bags and drainage cushions from top to bottom, and the impermeable concentration geotextile bags and sludge dehydration geotextile bags are connected through a second pipeline, and a second screw pump is arranged on the second pipeline. The sludge dehydration geotextile bags are connected to the curing system through a third pipeline through the wall of the sludge concentration and dehydration tank body, and a third screw pump is arranged on the third pipeline. The present invention enables the mud and water in the small-volume sludge slurry generated by the dredging project to be continuously and efficiently separated for external transportation or in-situ disposal, and can greatly reduce the operating cost and shorten the sludge treatment cycle.

Description

Technical Field

[0001] The present invention relates to the field of environmental engineering technology, and more specifically, to an intensive treatment system for small-volume river and lake sludge. Background Art

[0002] Silt dredging is the most important and effective means to solve the problem of silt accumulation in rivers and lakes. It can not only solve the problem of waterway blockage, but also quickly remove endogenous pollution and reduce the pollution load of water bodies. The problem and challenge encountered in silt dredging is that the silt has a high water content and must be dehydrated.

[0003] Traditional natural dewatering method of mud dump: This method is used to treat river and reservoir sediments. It is simple in technology and occupies a large area. It is a common method for domestic sediment treatment projects (including Taihe sediment cleaning and treatment). However, the efficiency of this dewatering method is very low. This method of using the yard to treat contaminated sediments still has certain environmental and safety hazards. Since the sediment in the yard is exposed and in direct contact with the surrounding environment, if the residual water treatment in the yard does not meet the standards, it will cause secondary pollution to the surrounding water bodies. Mechanical dewatering method: For treating organic and heavy metal polluted sediments, although the dewatering effect is good, there are shortcomings such as high one-time investment in equipment, consumption of power energy, construction of workshops and factories, and the processing capacity cannot meet the requirements of short on-site treatment of river and reservoir sediments. At present, geotextile tube bags are widely used in foreign contaminated sediment dewatering projects. In China, such as the Dianchi sludge dredging project, the Wuhan Waishahe sludge removal project, the Sino-Singapore Tianjin Eco-city sewage reservoir treatment project, and the Taihe Wuxi section sludge treatment project, the application is good, but there are also problems such as discontinuous treatment and relatively large area. If sludge solidification technology is not dehydrated, the amount of chemicals used will be huge and the cost will be very high. Summary of the invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the present invention provides an intensive treatment system for small-volume river and lake sludge. The method can continuously and efficiently separate the mud and water in the small-volume sludge slurry generated by dredging projects for external transportation or on-situ disposal, and can greatly reduce operating costs and shorten the sludge treatment cycle.

[0005] In order to achieve these purposes and other advantages according to the present invention, a small-volume river and lake sludge intensive treatment system is provided, comprising a sludge screening system, a sludge concentration and dehydration system and a solidification system connected in sequence;

[0006] The mud screening system is connected to the mud concentration and dehydration system through a first pipeline, and the first pipeline is sequentially connected to a first screw pump, a flocculant preparation device and a pipeline mixer;

[0007] The mud concentration and dehydration system includes: a mud concentration and dehydration tank body, a watertight concentration geobag, a sludge dehydration geobag and a drainage cushion layer; the mud concentration and dehydration tank body is provided with a watertight concentration geobag, a sludge dehydration geobag and a drainage cushion layer from top to bottom, the watertight concentration geobag and the sludge dehydration geobag are connected through a second pipe, a second screw pump is provided on the second pipe, the sludge dehydration geobag passes through the wall of the mud concentration and dehydration tank body through a third pipe and is connected to the solidification system, and a third screw pump is provided on the third pipe.

[0008] Preferably, the mud screening system comprises: a mud screening tank body and a vibrating screen arranged in the mud screening tank body.

[0009] Preferably, the solidification system comprises a sludge dosing stirring tank and a dosing tank; the dosing tank is connected to the sludge dosing stirring tank.

[0010] Preferably, the drainage cushion layer is composed of pebbles or gravels, with a particle size of 32 to 64 mm and a thickness of 10 to 30 cm.

[0011] Preferably, the pipeline mixer comprises:

[0012] A box body, which is arranged on the first pipe, the box body is a cylindrical structure, the top end surface of the box body has a liquid inlet, and the bottom end surface of the box body has a liquid outlet;

[0013] At least three groups of mixing components are arranged in the box body with gradually decreasing spacing from top to bottom; the mixing components include: a partition net, an elastic member and a fixed plate; the partition net is a conical structure with the cone point facing upward, the side of the partition net is arranged to contact the inner wall of the box body, the mesh area of ​​the partition net accounts for 1 / 2 to 2 / 3 of the entire partition net area, the angle between the cone surface of the partition net and its central axis is 60°, the fixed plate is arranged below the partition net, it is an inverted cone structure, the bottom of the fixed plate is provided with an opening, and its upper bottom is seamlessly fixed to the inner wall of the box body, the elastic component is composed of a plurality of springs, and the plurality of springs are evenly arranged between the partition net and the fixed plate;

[0014] At least three groups of air nozzle assemblies are arranged one by one above the mixing assembly; any group of air nozzle assemblies includes multiple air nozzles, and the multiple air nozzles are arranged at equal intervals along the circumference and longitudinal direction of the box body, and the air flow direction of the air nozzle is toward the partition net, and the initial air flow direction is 45° with the inner wall of the box body, the air nozzle is connected to the air pipe, and the air pipe is connected to the air generator.

[0015] Preferably, it also includes a control circuit, which includes a first, second, and third starting switches and a first, second, and third time relays, wherein the first, second, and third starting switches respectively control the start of the first, second, and third screw pumps, and the first, second, and third time relays are respectively used to set the single working time of the first, second, and third screw pumps.

[0016] The present invention also provides a treatment process based on a small-volume river and lake sludge intensive treatment system, comprising the following steps:

[0017] Step 1: Turn on the first screw pump and the second screw pump, and turn off the third screw pump. The fine mud screened out by the mud screening system is mixed with the flocculant flowing through the first pipeline through the first pipeline, the first screw pump and the flocculant preparation device, and the fine mud is flocculated and precipitated by the pipeline mixer, and then pumped into the sludge dewatering geobag after passing through the impermeable sludge thickening geobag;

[0018] Step 2: After the sludge dewatering geobag is full, turn off the second screw pump and the third screw pump, continue to fill the impermeable concentrated geobag, turn off the first screw pump, and let it stand for 3-5 hours;

[0019] Step 3: Turn on the first screw pump, the second screw pump and the third screw pump at the same time, set the flow rates of the first screw pump, the second screw pump and the third screw pump to the same, and then continue to run.

[0020] Preferably, the slurry in the slurry screening system is vibrated by a vibrating screen to process the large-size particles and separate them from the silt slurry.

[0021] Preferably, when the first screw pump is turned on in steps 1 to 3, the air generator is turned on at the same time.

[0022] The present invention has at least the following beneficial effects:

[0023] 1. The system and process of the present application have two functions: sludge concentration and dehydration. The design method further improves the utilization rate of the pool. The overall structure is relatively compact and highly concentrated, with a small footprint, and the equipment and devices used are common equipment and devices, with a relatively low cost.

[0024] 2. In the system of the present application, the mud in the upper layer of the impermeable concentrated geobags in the mud concentration and dehydration tank body further improves the dehydration efficiency of the bottom sludge dehydration geobags by using its own weight, and the dehydration efficiency of the sludge dehydration geobags is also improved by the initial concentration of the first layer of geobags. The two complement each other. In terms of technology, the present application only needs to be run for the first time. The setting method of each screw pump time relay cycle is mainly as follows: The first screw pump time relay setting cycle is calculated based on the first screw pump flow, the volume of the impermeable sludge concentrated geobag, and the volume of the sludge dehydration geobag [i.e. (volume of sludge dehydration geobag + impermeable sludge concentrated geobag) / first screw pump flow)]. The third screw pump setting cycle is calculated based on the first screw pump time relay setting cycle and the sludge concentration time of the impermeable sludge concentrated geobags (i.e. the first screw pump time relay setting cycle + sludge concentration time of the sludge concentrated geobags). Through the above time relay setting method, the sludge dewatering geobags and the impermeable sludge thickening geobags are filled with mud. After the mud in the first layer of impermeable sludge geobags is precipitated and concentrated under the action of flocculants and the mud in the second layer of sludge dewatering geobags is compressed and concentrated for 3-5 hours, the three screw pumps are started at the same time. The second screw pump continuously extracts the mud precipitated at the bottom of the impermeable sludge thickening geobags, and the new mud entering the impermeable sludge thickening geobags also has time to continue to settle, thereby realizing the sustainable operation of the entire system and being able to quickly meet the subsequent sludge transportation and treatment requirements.

[0025] 3. The concentration system is combined with the subsequent solidification treatment, so that the concentration and dehydration treatment time of the entire process can be reduced by more than 30% compared with the traditional geobag process, which can generally shorten the construction period of the dredging project. At the same time, the special concentration system of the present invention reduces the moisture content of the sludge entering the solidification system, so the amount of subsequent solidification agents used can be greatly reduced compared with the direct addition or initial concentration and addition of solidifying agents, and the treatment cost is lower than the traditional solidification and dehydration process.

[0026] 4. In addition to the initial sludge screening system, the subsequent dehydration is carried out in a closed manner using a mud concentration and dehydration system. Compared with other traditional processes, it reduces problems such as secondary atmospheric pollution. After the sludge dehydration tail water is filtered through geotextile bags, pollutants such as SS are greatly reduced, reducing secondary pollution of the water body.

[0027] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the intensive treatment system for small-volume river and lake sludge of the present invention;

[0029] Figure 2Schematic diagram of the structure of the pipeline mixer in Example 3 of the present invention.

[0030] Among them, 1 mud screening system, 1.1 vibrating screen, 1.2 mud screening tank body, 2 first pipeline, 3 first screw pump, 4 flocculant preparation device, 5 pipeline mixer, 6 second screw pump, 7 mud concentration and dehydration system, 7.1 mud concentration and dehydration tank body, 7.2 impermeable concentration geobag, 7.3 sludge dehydration geobag, 7.4 drainage cushion, 7.5 second pipeline, 7.6 drainage pipe, 8 third pipeline, 9 dosing and curing system, 9.1 third screw pump, 9.2 dosing tank, 9.3 sludge dosing mixing tank, 10 box body, 11 mixing assembly, 11.1 partition, 11.2 spring, 11.3 fixing plate, 12 air nozzle. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0032] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] Example 1

[0034] like Figure 1 As shown, a small-volume river and lake sludge intensive treatment system includes a mud screening system 1, a mud concentration and dehydration system 7 and a solidification system which are connected in sequence.

[0035] The mud screening system 1 comprises: a mud screening tank body 1.2 and a vibrating screen 1.1 arranged in the mud screening tank body 1.2. The vibrating screen 1.1 is fixed in the mud screening tank body 1.2 by a bracket or bolts.

[0036] The mud screening system 1 is connected to the mud concentration and dehydration system 7 via a first pipeline 2, and the first pipeline 2 is connected with a first screw pump 3, a flocculant preparation device 4 and a pipeline mixer 5 in sequence according to the flow direction.

[0037] The mud concentration and dehydration system 7 comprises: a mud concentration and dehydration tank body 7.1, a watertight concentration geotextile bag 7.2, a sludge dehydration geotextile bag 7.3 and a drainage cushion layer 7.4. The drainage cushion layer 7.4 is composed of pebbles or gravels, and its particle size is 32-64 mm and its thickness is 10-30 cm. The watertight concentration geotextile bag 7.2, the sludge dehydration geotextile bag 7.3 and the drainage cushion layer 7.4 are arranged in sequence from top to bottom in the mud concentration and dehydration tank body 7.1. The watertight concentration geotextile bag 7.2 and the sludge dehydration geotextile bag 7.3 are connected through a second pipeline 7.5, and a second screw pump 6 is arranged on the second pipeline 7.5. The sludge dehydration geotextile bag 7.3 is connected to the curing system through a third pipeline 8 through the wall of the mud concentration and dehydration tank body 7.1, and a third screw pump 9.1 is arranged on the third pipeline 8.

[0038] The solidification system comprises a sludge dosing stirring pool 9.3 and a dosing tank 9.2; the dosing tank 9.2 is connected to the sludge dosing stirring pool 9.3.

[0039] It also includes a control circuit, which includes a first, second, and third start switch and a first, second, and third time relay. The first, second, and third start switches respectively control the start of the first, second, and third screw pumps, and the first, second, and third time relays are used to set the single working time of the first, second, and third screw pumps. The setting method of each screw pump time relay cycle is mainly as follows: the first screw pump time relay setting cycle is calculated according to the first screw pump flow, the volume of the impermeable sludge concentration geotextile bag, and the volume of the sludge dewatering geotextile bag [i.e. (sludge dewatering geotextile bag volume + impermeable sludge concentration geotextile bag) / first screw pump flow)]. The third screw pump setting cycle is calculated according to the first screw pump time relay setting cycle and the sludge concentration time of the impermeable sludge concentration geotextile bag (i.e. the first screw pump time relay setting cycle + sludge concentration time of the sludge concentration geotextile bag). Through the above time relay setting method, the sludge dewatering geobags and the impermeable sludge thickening geobags are filled with mud. After the mud in the first layer of impermeable sludge geobags is precipitated and concentrated under the action of flocculants and the mud in the second layer of sludge dewatering geobags is compressed and concentrated for 3-5 hours, the three screw pumps are started at the same time. The second screw pump continuously extracts the mud precipitated at the bottom of the impermeable sludge thickening geobags, and the new mud entering the impermeable sludge thickening geobags also has time to continue to settle, thereby realizing the sustainable operation of the entire system and being able to quickly meet the subsequent sludge transportation and treatment requirements.

[0040] Example 2

[0041] A treatment process based on the small-volume river and lake sludge intensive treatment system in Example 1 comprises the following steps:

[0042] Step 1: When the system is operated for the first time, the mud first passes through the mud screening tank 1.2 and the vibrating screen 1.1 of the mud screening system 1. The vibrating screen 1.1 vibrates to process large-size particles, including shells, gravel, bricks, mud blocks, coarse-grained silt and other materials that may affect the operation of the concentration and dehydration system, and separates them from the silt mud.

[0043] Step 2: Turn on the first screw pump 3 and the second screw pump 6, and turn off the third screw pump 9.1. The fine mud screened by the mud screening system 1 is mixed with the flocculant flowing through the first pipeline 2, the first screw pump 3 and the flocculant preparation device 4 through the first pipeline 2, and the fine mud is flocculated and precipitated by the pipeline mixer 5, and then pumped into the sludge dewatering geobag 7.3 after passing through the impermeable sludge thickening geobag;

[0044] Step 2: After the sludge dewatering geotextile bag 7.3 is filled, turn off the second screw pump 6 and the third screw pump 9.1, continue to fill the impermeable thickening geotextile bag 7.2, turn off the first screw pump 3, and let it stand for 3-5 hours;

[0045] Step three, turn on the first screw pump 3, the second screw pump 6 and the third screw pump 9.1 at the same time, and set the flow rates of the first screw pump 3, the second screw pump 6 and the third screw pump 9.1 to be the same, and then continue to run them. The sludge dewatering tail water in the mud concentration and dewatering system 7 passes through the drainage cushion layer 7.4 and is discharged through the drainage pipe 7.6. The sludge pumped into the solidification system is directly transported out or treated in situ after being stirred with the solidifying agent.

[0046] It should be noted that although the last process in this embodiment mentions the use of a solidifying agent stirring system, this process is fully capable of selecting other solidifying or dehydrating systems, such as plate-and-frame machines, various mechanical dehydration and other treatment methods, to meet the treatment requirements of different sludge dehydration and subsequent resource utilization according to the concentration and properties of the sludge entering the system and the residence time of the sludge concentration treatment system. Therefore, various technical combinations with this sludge concentration and dehydration system and operation method as the core are all within the scope of protection of the present invention.

[0047] Example 3

[0048] like Figure 1 As shown, a small-volume river and lake sludge intensive treatment system includes a mud screening system 1, a mud concentration and dehydration system 7 and a dosing and solidification system 9 which are connected in sequence;

[0049] The mud screening system 1 is connected to the mud concentration and dehydration system 7 through a first pipeline 2, and the first pipeline 2 is connected with a first screw pump 3, a flocculant preparation device 4 and a pipeline mixer 5 in sequence according to the flow direction;

[0050] The mud concentration and dehydration system 7 comprises: a mud concentration and dehydration tank body 7.1, a watertight concentration geotextile bag 7.2, a sludge dehydration geotextile bag 7.3 and a drainage cushion layer 7.4; the drainage cushion layer 7.4 is composed of pebbles or gravels, and its particle size is 32-64 mm and its thickness is 10-30 cm. The mud concentration and dehydration tank body 7.1 is sequentially provided with a watertight concentration geotextile bag 7.2, a sludge dehydration geotextile bag 7.3 and a drainage cushion layer 7.4 from top to bottom, and the watertight concentration geotextile bag 7.2 and the sludge dehydration geotextile bag 7.3 are connected through a second pipeline 7.5, and a second screw pump 6 is arranged on the second pipeline 7.5. The sludge dehydration geotextile bag 7.3 is connected to the dosing and curing system 9 through a third pipeline 8 through the wall of the mud concentration and dehydration tank body 7.1, and a third screw pump 9.1 is arranged on the third pipeline 8.

[0051] The mud screening system 1 comprises: a mud screening tank body 1.2 and a vibrating screen 1.1 arranged in the mud screening tank body 1.2. The vibrating screen 1.1 is fixed in the mud screening tank body 1.2 by a bracket or bolts.

[0052] The dosing and solidification system 9 comprises a sludge dosing and stirring tank and a dosing tank 9.2; the dosing tank 9.2 is connected to the sludge dosing and stirring tank.

[0053] like Figure 2 As shown, the pipeline mixer 5 comprises:

[0054] A box body 10 is disposed on the first pipe 2. The box body 10 is a cylindrical structure. The top end surface of the box body 10 has a liquid inlet, and the bottom end surface of the box body 10 has a liquid outlet;

[0055] At least three groups of mixing components 11 are arranged in the box body 10 with the spacing gradually decreasing from top to bottom; the mixing components 11 include: a partition 11.1, an elastic member and a fixing plate 11.3; the partition 11.1 is a cone-shaped structure with the cone point facing upward, the side of the partition 11.1 is arranged to contact the inner wall of the box body 10, and the mesh area of ​​the partition 11.1 accounts for 1 / 2 to 2 / 3 of the entire area of ​​the partition 11.1. Here, the area of ​​the partition 11.1 and the mesh are calculated based on the upper surface of the partition 11.1 and the mesh. The hole area, the angle between the conical surface of the partition net 11.1 and its central axis is 60°, the fixed plate 11.3 is arranged below the partition net 11.1, and it is an inverted cone structure, the bottom of the fixed plate 11.3 is provided with an opening, and its upper bottom is seamlessly fixed to the inner wall of the box body 10, the elastic component is composed of a plurality of springs 11.2, and the plurality of springs 11.2 are evenly arranged between the partition net 11.1 and the fixed plate 11.3, and the partition net 11.1 is driven to move up and down by the reciprocating motion of the springs 11.2.

[0056] At least three groups of air nozzle 12 assemblies, wherein the air nozzle 12 assemblies are arranged one by one above the mixing assembly 11; any group of air nozzle 12 assemblies includes a plurality of air nozzles 12, and the plurality of air nozzles 12 are arranged at equal intervals along the circumference and longitudinal direction of the box body, and the air flow direction of the air nozzle 12 is toward the partition net 11.1, and the initial air flow direction is 45° with the inner wall of the box body 10, and the air nozzle 12 is connected to the air pipe, and the air pipe is connected to the air generator.

[0057] Example 4

[0058] like Figure 1 As shown, a small-volume river and lake sludge intensive treatment system includes a mud screening system 1, a mud concentration and dehydration system 7 and a dosing and solidification system 9 which are connected in sequence;

[0059] The mud screening system 1 is connected to the mud concentration and dehydration system 7 through a first pipeline 2, and the first pipeline 2 is connected with a first screw pump 3, a flocculant preparation device 4 and a pipeline mixer 5 in sequence according to the flow direction;

[0060] The mud concentration and dehydration system 7 comprises: a mud concentration and dehydration tank body 7.1, a watertight concentration geotextile bag 7.2, a sludge dehydration geotextile bag 7.3 and a drainage cushion layer 7.4; the drainage cushion layer 7.4 is composed of pebbles or gravels, and its particle size is 32-64 mm and its thickness is 10-30 cm. The mud concentration and dehydration tank body 7.1 is sequentially provided with a watertight concentration geotextile bag 7.2, a sludge dehydration geotextile bag 7.3 and a drainage cushion layer 7.4 from top to bottom, and the watertight concentration geotextile bag 7.2 and the sludge dehydration geotextile bag 7.3 are connected through a second pipeline 7.5, and a second screw pump 6 is arranged on the second pipeline 7.5. The sludge dehydration geotextile bag 7.3 is connected to the dosing and curing system 9 through a third pipeline 8 through the wall of the mud concentration and dehydration tank body 7.1, and a third screw pump 9.1 is arranged on the third pipeline 8.

[0061] The mud screening system 1 comprises: a mud screening tank body 1.2 and a vibrating screen 1.1 arranged in the mud screening tank body 1.2. The vibrating screen 1.1 is fixed in the mud screening tank body 1.2 by a bracket or bolts.

[0062] The dosing and solidification system 9 comprises a sludge dosing stirring tank and a dosing tank 9.2; the dosing tank 9.2 is connected to the sludge dosing stirring tank, and a plate and frame filter press is connected behind the stirring tank.

[0063] like Figure 2 As shown, the pipeline mixer 5 comprises:

[0064] A box body 10 is disposed on the first pipe 2. The box body 10 is a cylindrical structure. The top end surface of the box body 10 has a liquid inlet, and the bottom end surface of the box body 10 has a liquid outlet;

[0065] At least three groups of mixing components 11 are arranged in the box body 10 with the spacing gradually decreasing from top to bottom; the mixing components 11 include: a partition 11.1, an elastic member and a fixing plate 11.3; the partition 11.1 is a cone-shaped structure with the cone point facing upward, the side of the partition 11.1 is arranged to contact the inner wall of the box body 10, and the mesh area of ​​the partition 11.1 accounts for 1 / 2 to 2 / 3 of the entire area of ​​the partition 11.1. Here, the area of ​​the partition 11.1 and the mesh are calculated based on the upper surface of the partition 11.1 and the mesh. The hole area, the angle between the conical surface of the partition net 11.1 and its central axis is 60°, the fixed plate 11.3 is arranged below the partition net 11.1, and it is an inverted cone structure, the bottom of the fixed plate 11.3 is provided with an opening, and its upper bottom is seamlessly fixed to the inner wall of the box body 10, the elastic component is composed of a plurality of springs 11.2, and the plurality of springs 11.2 are evenly arranged between the partition net 11.1 and the fixed plate 11.3, and the partition net 11.1 is driven to move up and down by the reciprocating motion of the springs 11.2.

[0066] At least three groups of air nozzle 12 assemblies, wherein the air nozzle 12 assemblies are arranged one by one above the mixing assembly 11; any group of air nozzle 12 assemblies includes a plurality of air nozzles 12, and the plurality of air nozzles 12 are arranged at equal intervals along the circumference and longitudinal direction of the box body, and the air flow direction of the air nozzle 12 is toward the partition net 11.1, and the initial air flow direction is 45° with the inner wall of the box body 10, and the air nozzle 12 is connected to the air pipe, and the air pipe is connected to the air generator.

[0067] Example 4 is based on Example 3, with the plate and frame filter press connected behind the stirring tank in the dosing and curing system.

[0068] Comparative Example 1

[0069] The structures of the small-volume river and lake sludge intensive treatment systems of Comparative Example 1 and Example 3 are the same, and the only difference is that the pipeline mixer in Comparative Example 1 adopts a rotary blade pipeline mixer.

[0070] The mud with a water content of 92% cleared from a lake in a certain area in the south was required to be treated to a water content below 50%. The mud was treated by the small-volume river and lake sludge intensive treatment system in Example 1, Example 3 and Example 4, respectively, wherein polyaluminum chloride was used as the flocculant, and the addition amount was 1.5 g / L, lime and fly ash were used as the curing agent, and the addition amount was 40 g / L. Finally, the water content of the mud cake in the sludge dosing stirring tank of Example 1 was 45%, the water content of the mud cake in the sludge dosing stirring tank of Example 3 was 40%, and the water content of the mud cake after filtration by the plate and frame filter press in Example 4 was 32%, which can meet the water content requirements for rapid transportation or subsequent resource utilization.

[0071] The dehydration rate is significantly improved because the pipeline mixer in Example 3 is compared with that in Example 1. When the mud enters the box body of the pipeline mixer in Example 3, the partition screen makes a reciprocating motion up and down under the impact of the mud, and enters the first space formed by the upper mixing component and the lower mixing component after passing through the opening of the partition screen and the fixed plate, which gradually increases from the middle to the two side chambers. Since the partition screen of the lower mixing component is still reciprocating, the overall volume of the first space is also changing reciprocatingly, causing the mud to form turbulence. At the same time, the air ejected from the air nozzle (the air flow rate in this Example 3 is 2L / min) impacts the mud fluid. Under the action of the pipeline mixer, the complex ions in the flocculant and the colloidal particles in the mud collide with each other, and the colloidal particles are electrically neutralized and destabilized to coagulate, so that the colloidal particles can be more fully coagulated. At the same time, the complex ions in the flocculant are more fully combined with the colloidal particles in the mud to achieve a better flocculation and precipitation effect, thereby improving the subsequent dehydration rate.

[0072] The main reason why the dehydration efficiency of Implementation Example 4 is significantly improved compared with Implementation Example 3 is that, under the further filtration of the plate and frame filter press, the water in the modified dehydrated sludge in Implementation Example 3 is further squeezed out by the external pressure. This also further verifies the description in Implementation Example 2. That is, although the last process in Implementation Example 2 mentions the use of a solidifying agent stirring system, this process is fully capable of choosing to use other solidification or dehydration systems, such as plate and frame machines, various mechanical dehydration and other treatment methods, according to the concentration and properties of the mud entering the system and the residence time of the mud concentration treatment system to meet the treatment requirements of different sludge dehydration and subsequent resource utilization. Therefore, various technical combinations with this sludge concentration and dehydration system and operation method as the core are all within the scope of protection of the present invention.

[0073] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A small-volume river and lake sludge intensive treatment system, characterized in that: It includes a mud screening system, a mud concentration and dehydration system and a solidification system which are connected in sequence; The mud screening system is connected to the mud concentration and dehydration system through a first pipeline, and the first pipeline is sequentially connected to a first screw pump, a flocculant preparation device and a pipeline mixer; The mud concentration and dehydration system comprises: a mud concentration and dehydration tank body, a watertight concentration geobag, a sludge dehydration geobag and a drainage cushion layer; the mud concentration and dehydration tank body is provided with a watertight concentration geobag, a sludge dehydration geobag and a drainage cushion layer from top to bottom, the watertight concentration geobag and the sludge dehydration geobag are connected through a second pipe, a second screw pump is provided on the second pipe, the sludge dehydration geobag passes through the wall of the mud concentration and dehydration tank body through a third pipe and is connected to the curing system, and a third screw pump is provided on the third pipe; The pipeline mixer comprises: A box body, which is arranged on the first pipe, the box body is a cylindrical structure, the top end surface of the box body has a liquid inlet, and the bottom end surface of the box body has a liquid outlet; At least three groups of mixing components are arranged in the box body with gradually decreasing spacing from top to bottom; the mixing components include: a partition net, an elastic member and a fixed plate; the partition net is a conical structure with the cone point facing upward, the side of the partition net is arranged to contact the inner wall of the box body, the mesh area of ​​the partition net accounts for 1 / 2 to 2 / 3 of the entire partition net area, the angle between the cone surface of the partition net and its axis is 60°, the fixed plate is arranged below the partition net, it is an inverted cone structure, the bottom of the fixed plate is provided with an opening, and its upper bottom is seamlessly fixed to the inner wall of the box body, the elastic component is composed of a plurality of springs, and the plurality of springs are evenly arranged between the partition net and the fixed plate; At least three groups of air nozzle assemblies are arranged one by one above the mixing assembly; any group of air nozzle assemblies includes multiple air nozzles, and the multiple air nozzles are arranged at equal intervals along the circumference and longitudinal direction of the box body, and the air flow direction of the air nozzle is toward the partition net, and the initial air flow direction is 45° with the inner wall of the box body, the air nozzle is connected to the air pipe, and the air pipe is connected to the air generator.

2. The intensive treatment system for small-volume river and lake sludge according to claim 1 is characterized in that: The mud screening system comprises: a mud screening tank body and a vibrating screen arranged in the mud screening tank body.

3. The intensive treatment system for small-volume river and lake sludge according to claim 2 is characterized in that: The solidification system comprises a sludge dosing stirring pool and a dosing tank; the dosing tank is connected to the sludge dosing stirring pool.

4. The intensive treatment system for small-volume river and lake sludge according to claim 1 or 3, characterized in that: The drainage cushion layer is composed of pebbles or gravels, with a particle size of 32-64 mm and a thickness of 10-30 cm.

5. The intensive treatment system for small-volume river and lake sludge according to claim 1, characterized in that: It also includes a control circuit, which includes a first, second, and third starting switches and a first, second, and third time relay. The first, second, and third starting switches respectively control the start of the first, second, and third screw pumps, and the first, second, and third time relays are respectively used to set the single working time of the first, second, and third screw pumps.

6. A treatment process based on the intensive treatment system for small-volume river and lake sludge according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Turn on the first screw pump and the second screw pump, and turn off the third screw pump. The fine mud screened out by the mud screening system is mixed with the flocculant flowing through the first pipeline through the first pipeline, the first screw pump and the flocculant preparation device, and the fine mud is flocculated and precipitated by the pipeline mixer, and then pumped into the sludge dewatering geobag after passing through the impermeable sludge thickening geobag; Step 2: After the sludge dewatering geobag is full, turn off the second screw pump and the third screw pump, continue to fill the impermeable concentrated geobag, turn off the first screw pump, and let it stand for 3-5 hours; Step 3: Turn on the first screw pump, the second screw pump and the third screw pump at the same time, set the flow rates of the first screw pump, the second screw pump and the third screw pump to the same, and then continue to run.

7. The treatment process of the intensive treatment system for small-volume river and lake sludge according to claim 6, characterized in that: The mud in the mud screening system is vibrated through the vibrating screen to process large-size particles and separate them from the silt mud.

8. The treatment process of the intensive treatment system for small-volume river and lake sludge according to claim 6, characterized in that: When the first screw pump is turned on in steps 1 to 3, the air generator is turned on at the same time.

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