CN113683274A - System and method for ex-situ treatment of sludge in urban pipe gallery - Google Patents
System and method for ex-situ treatment of sludge in urban pipe gallery Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/24—Separation of coarse particles, e.g. by using sieves or screens
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a system and a method for ectopic treatment of sludge in an urban pipe gallery, wherein the system specifically comprises the following steps: the device comprises a sludge collecting module, a screening module, a dehydration module and a tail water treatment module; the sludge collecting module is used for collecting sludge discharged by dredging, and the sludge is conveyed to the screening module after being homogenized and equalized; the screening module is used for carrying out multi-stage screening and impurity removal on the sludge, and the sludge obtained after screening enters the dehydration module; the dehydration module is used for dehydrating and reducing the volume of the sludge; dewatering and volume reduction are carried out to obtain tail water and mud cakes, and the tail water enters a tail water treatment module; the tail water treatment module is used for carrying out biochemical treatment on tail water. The invention can realize the cascade screening of the sludge of the pipe gallery by carrying out the multistage screening and dehydration treatment on the sludge, reduces the final sludge disposal amount and realizes the reduction treatment. The biochemical treatment is carried out in the tail water treatment module, so that the content of pollutants in the sludge is reduced, and the harmless treatment of the sludge is realized.
Description
Technical Field
The invention belongs to the field of sludge treatment, and particularly relates to an ectopic sludge treatment system and method for an urban pipe gallery.
Background
The sludge is a main byproduct of the urban pipe gallery system and is a sediment for dredging and dredging in the maintenance of the urban pipe gallery. The deposit in the piping lane has the existing particulate matter and the impurity that gets into piping lane conveying system along with domestic sewage and industrial waste water, also has road dust fall, rubbish and the mud that the construction site discharged, other debris in addition, such as branch, plastic bag, cloth piece, stone, fibre, spoil, silt, beverage bottle, packing carton etc.. The piping lane needs to be maintained and dredged after long-time use, eliminates the mud in the piping lane, reduces the negative effects of mud to the piping lane. Dredged sludge (the water content is about 95 percent) is mainly treated by natural airing and then landfill, but with the acceleration of the urbanization process, the site which can be used for natural airing is gradually reduced, and the standard of the pipe gallery sludge entering the refuse landfill is more and more strict, so that the traditional treatment mode of the pipe gallery sludge is limited, and is also limited by the treatment mode and cost, a large-scale, standardized and effective treatment mode is not formed, and most of dredged sludge treatment belongs to the test and research stage; importantly, the sludge of the pipe gallery contains a large amount of available resources, so that a sludge treatment method which can realize reduction, stabilization, harmlessness and reclamation of the sludge of the pipe gallery is urgently needed.
The domestic existing pipe gallery sludge treatment mainly adopts the following two processes:
(1) sludge elutriation and screening process
The main principle is that hydraulic power, mechanical force and gravity separation are combined with particle size separation to separate each component in the sludge in the pipe network for further separation treatment. The specific flow is shown in figure 1: pipe network mud is carried the mud storage tank buffer memory between the grid sediment feeding by tank car or transport vechicle at first, then carries to feeding dosing apparatus through grab bucket elevator, inputs a thick material separator with the mud material uniformly quantitatively through feeding dosing apparatus, carries out the separation of thick material. The coarse material separation device is used for carrying out screening and washing treatment on coarse materials through a screen with the aperture of 15mm, and the generated coarse materials are discharged into a coarse material slag box to be transported outwards. And the mud and sand with the aperture of 15mm of the through-flow screen mesh and the cleaning water for washing the coarse substances and separating the mud and the sand are discharged into a sand washing and separating device together for washing and separating. In the sand washing separation process, fine sand with the particle size of more than 0.2mm is separated, fine sand substances and organic substances are separated, the recovery rate of gravel with the particle size of more than or equal to 0.2mm can reach more than 95%, the organic loss content in the fine sand is reduced to below 7%, and the separated fine sand substances can be recycled as building materials. Through the supernatant fluid of washing sand separator overflow discharge, discharge into 1 meticulous filter equipment with other organic matter liquid and carry out depth filtration processing, contain the material that floats in the mixed liquid, the material that will float carries out filtration processing, can get rid of the material that floats in the washing water this moment effectively, dispose professional filtration equipment, make the washing water carry out depth filtration and regeneration retrieval and utilization, cyclic utilization sparge water makes and to wash can save a large amount of water resources when thick thing separation, and can provide the carbon source recovery in the system, improve the carbon content in the sewage. If the silt content in the sludge is high, a cyclone sand removing device can be added behind the fine filtering device, and silt with the particle size smaller than 0.2mm can be separated.
(2) Wet mechanical treatment process
As shown in fig. 2: the specific process is as follows:
s1: firstly, performing coarse screening treatment on the pipe gallery sludge through a coarse screening device to screen out fault substances, such as branches larger than 100 mm;
s2: screening and coarse washing the sludge by a coarse screening device to remove coarse substances, such as grid slag with the size larger than 10mm, packaging materials, cans and stones;
s3: then carrying out sand-water separation and sand setting washing treatment to remove mineralized substances such as fine sand;
s4: finally, fine sand separation treatment and organic matter dehydration treatment are carried out to remove organic solid matters, such as organic solid matters larger than 1 mm.
The above process has the following defects: the process only aims at the treatment and disposal of the sludge of the domestic sewage pipe gallery, and does not consider the treatment and disposal of the sludge of the industrial sewage pipe gallery; since the sludge of the industrial sewage pipe gallery contains a small amount of organic matters, heavy metals, harmful bacteria and the like, it is important to perform reduction, harmless and recycling treatment on the substances which are likely to form secondary pollution.
Disclosure of Invention
In view of the above problems, an object of the present invention is to: provides an ex-situ sludge treatment system for an urban pipe gallery.
In order to achieve the above purpose, the invention provides the following technical scheme:
the utility model provides an urban pipe gallery mud ectopic processing system specifically includes: the device comprises a sludge collecting module, a screening module, a dehydration module and a tail water treatment module;
the sludge collecting module is used for collecting sludge discharged by dredging, and the sludge is conveyed to the screening module after being homogenized and equalized;
the screening module is used for carrying out multi-stage screening and impurity removal on the sludge, and the sludge obtained after screening enters the dehydration module;
the dehydration module is used for dehydrating and reducing the volume of the sludge; dewatering and volume reduction are carried out to obtain tail water and mud cakes, and the tail water enters a tail water treatment module;
the tail water treatment module is used for carrying out biochemical treatment on tail water.
Preferably, the collection mud module for collection mud pond, collection mud pond in set up agitating unit and thick grid, the below in collection mud pond set up out mud mouth, thick grid perpendicular to collection mud pond inner wall set up and will collect mud pond and cut apart into upper and lower two parts, agitating unit's stirring vane set up the below at thick grid, the mud that goes out of mud mouth pass through the elevator pump and deliver to the screening module.
Preferably, the aperture of the coarse grid is 1.6-2.5 cm.
Preferably, the screening module comprises a plurality of vibrating screens and a plurality of cyclones; and leaching modules are arranged in the vibrating screen and the cyclone, and are used for leaching the sludge by using leaching liquid in the screening process.
Preferably, the leaching solution adopted when the leaching module is used for leaching is one or more of clear water, an ethylene diamine tetraacetic acid solution and a citric acid solution.
Preferably, the screening module comprises a first-stage vibrating screen, a second-stage vibrating screen, a first-stage cyclone and a second-stage cyclone which are sequentially connected in series; and the sludge obtained by screening of the second-stage cyclone is conveyed to a dehydration module through a lifting pump.
Preferably, the first-stage vibrating screen screens pebbles with the particle size larger than 1 mm; screening coarse sand with the size of 1 mm-600 mu m by the second-stage vibrating screen; the first-stage cyclone is used for screening medium sand of 600-300 mu m; and screening fine sand with the particle size of 300-75 microns by the secondary cyclone.
Preferably, the dehydration module comprises a sludge sedimentation tank, a conditioning tank and a dehydrator which are sequentially connected through pipelines, and the dehydrator and the sludge sedimentation tank are respectively connected to the tail water treatment module through respective pipelines; a stirring device is arranged in the conditioning tank;
the sludge obtained by the screening module is conveyed to a sludge sedimentation tank through a pipeline, and is sedimentated by the sludge sedimentation tank to obtain lower layer slurry, the lower layer slurry in the sludge sedimentation tank is conveyed to a conditioning tank and a dehydrator in sequence through the pipeline, and is dehydrated by the dehydrator to obtain tail water and a sludge cake; and tail water obtained after dehydration and upper layer tail water obtained after sedimentation in a sludge sedimentation tank enter a tail water treatment module.
Preferably, the tail water treatment module comprises a tail water sedimentation tank and tail water integrated treatment equipment, tail water obtained after dehydration by the dehydrator and upper-layer tail water obtained after sedimentation in the sludge sedimentation tank both enter the tail water sedimentation tank, and upper-layer tail water obtained after sedimentation in the tail water sedimentation tank enters the tail water integrated treatment equipment;
the tail water integrated treatment equipment is provided with a tail water inlet, a medicament inlet and a medicament outlet, and the treated tail water is discharged from the outlet; the outlet is connected to the screening module by a conduit.
Preferably, a first medicament is added into the sludge collecting module, and a second medicament is added into the tail water integrated treatment equipment; a conditioner is added into the conditioning tank;
the first medicament comprises a stabilizer, an oxidant, a reducing agent, a conditioner and a flocculating agent; the second medicament comprises a stabilizing agent, an oxidizing agent, a reducing agent and a flocculating agent;
the stabilizer is one or more of an alkaline stabilizer, a phosphate stabilizer, a sulfide stabilizer, an iron salt stabilizer, a silicate stabilizer, a mineral stabilizer and biochar;
the oxidant is a Fenton reagent;
the reducing agent is sulfite;
the conditioner is polyferric chloride and polyacrylamide;
the flocculant is polyaluminium chloride and polyacrylamide.
Preferably, the treatment system further comprises a medicament preparation module, wherein the medicament preparation module is used for preparing medicaments required by biochemical treatment of the conditioning pool, the sludge collection module and the tail water treatment module; the medicine preparation module comprises a medicine dissolving device and a water storage tank, the medicine dissolving device is provided with a stirring device, a raw material inlet, a water inlet and a medicament outlet, the stirring device is arranged in the medicine dissolving device, and the water inlet is communicated with the water storage tank; and the agent outlet is respectively connected with the tail water integrated treatment equipment, the conditioning tank and the sludge collecting module through pipelines.
Preferably, the treatment system further comprises a recycling module, and the recycling module is used for recycling the mud cakes obtained by the dehydration module.
In view of the above problems, another object of the present invention is to: provides an ex-situ treatment method for sludge of an urban pipe gallery.
In order to achieve the above purpose, the invention provides the following technical scheme:
an ex-situ treatment method for sludge of an urban pipe gallery comprises the following specific steps:
s1: collecting the discharged sludge by a sludge collecting module, and homogenizing and uniformly treating the sludge;
s2: the sludge obtained in the step S1 is subjected to multi-stage screening and impurity removal by adopting a screening module;
s3: dewatering and volume reduction treatment are carried out on the sludge obtained in the step S2 by adopting a dewatering module to obtain tail water and a mud cake;
s4: and carrying out biochemical treatment on the tail water by adopting a tail water treatment module.
Preferably, the dehydration module in step S3 includes a sludge settling tank, a conditioning tank and a dehydrator, which are sequentially connected through pipes, and the dehydrator and the sludge settling tank are respectively connected to the tail water treatment module through respective pipes; the specific process of step S3 is as follows: conveying the sludge obtained by the screening module to a sludge sedimentation tank through a pipeline, conditioning the lower layer of sludge obtained after sedimentation in a conditioning tank, dehydrating the sludge through a dehydrator, and dehydrating the sludge to obtain tail water and a sludge cake; and tail water obtained after dehydration and upper layer tail water obtained after sedimentation in a sludge sedimentation tank enter a tail water treatment module for biochemical treatment.
The invention has the beneficial effects that:
the invention realizes the 'reduction', 'harmless', 'resource' treatment of the industrial sewage pipe gallery sludge.
(1) The invention can realize the cascade screening of the sludge of the pipe gallery by carrying out the multistage screening and dehydration treatment on the sludge, reduces the final sludge disposal amount and realizes the reduction treatment.
(2) According to the invention, the sludge collection module, the conditioning pool and the tail water treatment module are arranged, and the agents are added into the sludge collection module, the conditioning pool and the tail water treatment module to treat the sludge or the tail water, so that the content of pollutants in the sludge is reduced, and the harmless treatment of the sludge is realized.
(3) The substances such as coarse stones, pebbles, fine sand and the like screened by the vibrating screen and the cyclone can be used for the utilization in the building industry, the dewatered mud cake can be used for making bricks, and the tail water can be recycled as leacheate or discharged back to a sewage treatment plant after being treated, so that the 'recycling' treatment of the sludge is realized.
The invention (introduction of advantages). Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 shows a schematic diagram of a prior art sludge elutriation + screening process;
FIG. 2 shows a schematic diagram of a wet mechanical process of the prior art;
FIG. 3 shows a schematic diagram of a municipal pipe gallery sludge ex-situ treatment system according to the present invention;
in the reference symbols: 10-a sludge collecting tank, 11-a coarse grid, 20-a first-stage vibrating screen, 30-a second-stage vibrating screen, 40-a first-stage cyclone, 50-a second-stage cyclone, 60-a sludge settling tank, 70-a tail water settling tank, 80-a conditioning tank, 90-a dehydrator, 100-tail water integrated treatment, 110-a medicine dissolving device and 120-a water storage tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 3: the invention discloses an ex-situ sludge treatment system for an urban pipe gallery, which specifically comprises a sludge collection module, a screening module, a dehydration module and a tail water treatment module; the sludge collecting module is used for collecting sludge discharged by dredging, and the sludge is conveyed to the screening module after being homogenized and equalized; the screening module is used for carrying out multi-stage screening and impurity removal on the sludge, and the sludge obtained after screening enters the dehydration module; the dehydration module is used for dehydrating and reducing the volume of the sludge; dewatering and volume reduction are carried out to obtain tail water and mud cakes, and the tail water enters a tail water treatment module; the tail water treatment module is used for carrying out biochemical treatment on tail water.
Specifically, collection mud module for collection mud pond 10, collection mud pond 10 in set up agitating unit and thick grid 11, the below of collection mud pond 10 set up the mud outlet, thick grid 11 perpendicular to collection mud pond 10 inner wall setting and will collect mud pond 10 and cut apart into upper and lower two parts, agitating unit's stirring vane set up in the below of thick grid 11, the mud that the mud outlet came out deliver to the screening module through the elevator pump. The aperture of the coarse grid 11 is 2 cm.
Through setting up collection mud pond 10, mud can get rid of the great debris that are greater than 2cm through collection mud pond 10, and mud stops (agitating unit will open when staying, and general dwell time is about 10 min) at collection mud pond 10, can realize the homogeneity and the average volume of mud.
Specifically, the screening module comprises a plurality of vibrating screens and a plurality of cyclones; and leaching modules are arranged in the vibrating screen and the cyclone, and are used for leaching the sludge by using leaching liquid in the screening process. The leaching solution adopted by the leaching module during leaching is one or more of clear water, an ethylene diamine tetraacetic acid solution and a citric acid solution. When the sludge does not contain organic matters or heavy metals, the leacheate can be clear water, and when the sludge contains the organic matters or the heavy metals, the leacheate is added with ethylenediamine tetraacetic acid and/or citric acid. In practical application, the leaching module can be a spraying device arranged in the vibrating screen and the cyclone, and the leaching solution is sprayed into the vibrating screen and the cyclone through a spray head of the spraying device.
Through setting up a plurality of shale shakers and swirler, realize the cascade screening to piping lane mud, reduced the handling capacity of final mud. Through the arrangement of the leaching module, the screen mesh blockage of the vibrating screen and the cyclone can be prevented, and organic matters or heavy metals in sludge can be removed.
Preferably, the screening module comprises a first-stage vibrating screen 20, a second-stage vibrating screen 30, a first-stage cyclone 40 and a second-stage cyclone 50 which are sequentially arranged in series; the sludge screened out by the second-stage cyclone 50 is conveyed to a dehydration module through a lifting pump; the first-stage vibrating screen 20 can screen pebbles with the particle size larger than 1 mm; the second-stage vibrating screen 30 can screen coarse sand with the particle size of 1 mm-600 mu m; the first-stage cyclone 40 can sieve medium sand with the particle size of 600-300 mu m; the second-stage cyclone 50 sieves out fine sand with the particle size of 300-75 mu m, and slurry with the particle size of less than 75 mu m is obtained after sieving.
Specifically, the dehydration module comprises a sludge sedimentation tank 60, a conditioning tank 80 and a dehydrator 90 which are sequentially connected through pipelines, the dehydrator 90 and the sludge sedimentation tank 60 are respectively connected to the tail water treatment module through respective pipelines, and a stirring device is arranged in the conditioning tank 80;
the sludge obtained by the screening module is conveyed to a sludge sedimentation tank 60 through a pipeline, the sludge is sedimentated by the sludge sedimentation tank 60 to obtain lower layer slurry, the lower layer slurry of the sludge sedimentation tank 60 is conveyed to a conditioning tank 80 and a dehydrator 90 in sequence through a pipeline, and tail water and a sludge cake are obtained after the sludge is dehydrated by the dehydrator 90; and tail water obtained after dehydration and upper layer tail water obtained after the sludge sedimentation tank 60 is sedimentated enter the tail water treatment module.
Realize mud volume reduction through setting up the dehydration module, wherein take care of pond 80 can take care of the mud after the natural sedimentation, can detach the harmful impurity such as organic matter and heavy metal in the mud like this, through setting up sludge sedimentation pond 60 for mud natural sedimentation is more abundant.
Specifically, the tail water treatment module comprises a tail water sedimentation tank 70 and tail water integrated treatment equipment 100, tail water obtained after dehydration by the dehydrator 90 and upper layer tail water obtained after sedimentation by the sludge sedimentation tank 60 both enter the tail water sedimentation tank 70, and upper layer tail water obtained after sedimentation by the tail water sedimentation tank 70 enters the tail water integrated treatment equipment 100;
the tail water integrated treatment equipment 100 is provided with a tail water inlet, a medicament inlet and a medicament outlet, and the treated tail water is discharged from the outlet; the outlet is connected to the screening module by a conduit.
Preferably, according to actual needs, a first medicament is added into the sludge collection module, and a second medicament is added into the tail water integrated treatment equipment 100; a conditioner is added into the conditioning tank 80;
the first medicament comprises a stabilizer, an oxidant, a reducing agent, a conditioner and a flocculating agent; the second medicine comprises a stabilizer, an oxidizing agent, a reducing agent and a flocculating agent;
the stabilizer is one or more of an alkaline stabilizer, a phosphate stabilizer, a sulfide stabilizer, an iron salt stabilizer, a silicate stabilizer, a mineral stabilizer and biochar; the oxidant is a Fenton reagent; the reducing agent is sulfite; the conditioner is polyferric chloride and polyacrylamide (the mass ratio of the polyferric chloride to the polyacrylamide is (50-100): 2-5)); the flocculant is polyaluminium chloride and polyacrylamide (the mass ratio of the polyaluminium chloride to the polyacrylamide is (30-50): 1).
The effects of the raw materials in the medicament are as follows:
a stabilizer: for sludge polluted by heavy metals, the heavy metals cannot be degraded by microorganisms and can only migrate and convert among water, substrate and organisms in different valence states, and the stabilizer can stabilize the form of the heavy metals and delay the form change of the heavy metals;
oxidizing agent and reducing agent: accelerating sludge dehydration;
conditioner: can change the physicochemical property of sludge particles, destroy the colloid structure of the sludge, reduce the affinity of the sludge with water and reduce the specific resistance, thereby improving the dehydration performance of the sludge;
flocculating agent: the method is beneficial to improving the floc of the sludge, so that the floc of the sludge is easier to form, the adsorption effect of the sludge is increased, and the sludge is rapidly settled.
The specific addition of the above agents is determined according to the actual sludge condition, wherein the addition of the conditioner in the conditioning tank 80 is as follows: poly ferric chloride (50-100 kg/t (absolute dry mud)), polyacrylamide (2-5 kg/t (absolute dry mud)).
Adding a first medicament into a sludge collection module to carry out biochemical treatment on sludge, adding a second medicament into tail water integrated treatment equipment 100 to carry out biochemical treatment on dehydrated tail water and precipitated upper-layer tail water in a precipitation tank; a conditioner is added into the conditioning pool 80 for muddy conditioning; harmful impurities such as organic matters and heavy metals in sewage and sludge can be removed through the operations; the outlet of the tail water treatment module is connected to the screening module through a pipeline, so that the treated tail water is conveyed to the screening module to be used as leacheate, and the tail water is recycled.
Preferably, the treatment system further comprises a medicament preparation module, wherein the medicament preparation module is used for preparing medicaments required by biochemical treatment of the conditioning tank 80, the sludge collection module and the tail water treatment module; the medicine preparation module comprises a medicine dissolving device 110 and a water storage tank 120, wherein the medicine dissolving device 110 is provided with a stirring device, a raw material inlet, a water inlet and a medicament outlet, the stirring device is arranged inside the medicine dissolving device 110, and the water inlet is communicated with the water storage tank 120; the medicament outlet is respectively connected with the tail water integrated treatment equipment 100, the conditioning tank 80 and the sludge collecting module through pipelines.
Preferably, the treatment system further comprises a recycling module, and the recycling module is used for recycling the mud cakes obtained by the dehydration module. The collected mud cakes can be used for making bricks, slope protection or roadbed materials and the like, and the specific way can be determined according to the actual conditions of projects.
When the lifting pump is used specifically, the lifting pump can be arranged on the pipeline according to actual needs.
Based on the system and with reference to fig. 3, the method for treating the sludge ex-situ in the urban pipe gallery comprises the following specific steps:
s1: collecting the discharged sludge by adopting a sludge collecting module, and homogenizing and uniformly treating the sludge
Specifically, the sludge is conveyed to a sludge collection module (preferably, a first medicament is added into the sludge collection module for biochemical treatment), the sludge passes through a coarse grid 11, larger impurities larger than 2cm are removed, and after the sludge collection tank 10 stays for a period of time (when the sludge stays, a stirring device is started, and the sludge stays for about 10min generally), the homogenization and the uniform amount of the sludge are realized.
S2: the sludge obtained in the step S1 is subjected to multi-stage screening and impurity removal by adopting a screening module
Specifically, the homogenized and equalized sludge is conveyed from a sludge outlet of the sludge collection tank 10 through a lifting pump to enter a screening module for multi-stage screening and impurity removal; specifically, the sludge firstly enters a first-stage vibrating screen 20, the aperture (1mm) of the screen mesh of the first-stage vibrating screen 20 is large, and pebbles (except the pebbles, plastic, foam, dead branches, grass leaves and other impurities) larger than 1mm in the slurry can be separated; the undersize of the first-stage vibrating screen enters a second-stage vibrating screen 30, the particle size of the second-stage vibrating screen 30 is reduced (the aperture of a screen is 600 mu m), and impurities such as coarse sand with the particle size of 1 mm-600 mu m can be further separated; the undersize of the second-stage vibrating screen 30 enters a first-stage cyclone 40, under the action of centrifugal force and gravity, the first-stage cyclone 40 can mainly screen medium sand with the particle size of 600-300 mu m, the undersize of the first-stage cyclone 40 enters a second-stage cyclone 50, and the second-stage cyclone 50 separates fine sand with the particle size of 300-75 mu m.
Preferably, in the screening process, the leaching module is adopted to leach the sludge; generally, clear water is selected as leacheate, and when sludge is polluted by heavy metals or organic matters, ethylenediamine tetraacetic acid and citric acid are added into the clear water for leaching. The hair and garbage screened by the screening module can be specially treated by the external operation of a sanitation department, and the gravel (coarse sand, medium sand and fine sand) can be used for the construction industry (road construction, buried pipe materials, canal construction, matrix materials for soil remediation and the like).
S3: dewatering and volume reduction treatment are carried out on the sludge obtained in the step S2 by adopting a dewatering module to obtain tail water and a sludge cake
Specifically, the sludge (the sludge with the particle size smaller than 75 μm) treated by the screening system enters a dehydration module, namely, the undersize of the second-stage cyclone 50 is pumped into a sludge sedimentation tank 60, the lower-layer slurry from the sludge sedimentation tank 60 enters a conditioning tank 80 for conditioning by using a conditioner, and then enters a dehydrator 90 for dehydration treatment to obtain tail water and a sludge cake; and tail water obtained after dehydration and upper layer tail water obtained after precipitation in the sludge precipitation tank 60 enter the tail water treatment module.
Mud cakes obtained by the dehydration module are recycled by the recycling module, the collected mud cakes can be used for making bricks, and the produced bricks can be used for paving sidewalks, squares, park roads and the like.
S4: and carrying out biochemical treatment on the tail water by adopting a tail water treatment module.
Specifically, the tail water obtained after dehydration and the upper layer tail water obtained after precipitation in the sludge sedimentation tank 60 both enter the tail water sedimentation tank 70 in the tail water treatment module, and the upper layer tail water obtained after precipitation in the tail water sedimentation tank 70 enters the tail water integrated treatment equipment 100; the tail water is biochemically treated by the second medicament in the tail water integrated treatment equipment 100 to remove harmful substances in the tail water, and the tail water after biochemical treatment can be respectively connected to the first-stage vibrating screen 20, the second-stage vibrating screen 30, the first-stage swirler 40 and the second-stage swirler 50 through pipelines and is used as a leacheate.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (14)
1. The utility model provides an urban pipe gallery mud ectopic processing system which characterized in that: the method specifically comprises the following steps: the device comprises a sludge collecting module, a screening module, a dehydration module and a tail water treatment module;
the sludge collecting module is used for collecting sludge discharged by dredging, and the sludge is conveyed to the screening module after being homogenized and equalized;
the screening module is used for carrying out multi-stage screening and impurity removal on the sludge, and the sludge obtained after screening enters the dehydration module;
the dehydration module is used for dehydrating and reducing the volume of the sludge; dewatering and volume reduction are carried out to obtain tail water and mud cakes, and the tail water enters a tail water treatment module;
the tail water treatment module is used for carrying out biochemical treatment on tail water.
2. The municipal pipe gallery sludge ex-situ treatment system according to claim 1, wherein: the mud collection module for the mud collection pond, the mud collection pond in set up agitating unit and thick grid, the below in mud collection pond set up the mud outlet, thick grid perpendicular to mud collection pond inner wall set up and will gather the mud pond and cut apart into upper and lower two parts, agitating unit's stirring vane set up the below at thick grid, the mud that the mud outlet came out deliver to the screening module through the elevator pump.
3. The municipal pipe gallery sludge ex-situ treatment system according to claim 2, wherein: the aperture of the coarse grating is 1.6-2.5 cm.
4. The municipal pipe gallery sludge ex-situ treatment system according to claim 1, wherein: the screening module comprises a plurality of vibrating screens and a plurality of cyclones; and leaching modules are arranged in the vibrating screen and the cyclone, and are used for leaching the sludge by using leaching liquid in the screening process.
5. The municipal pipe gallery sludge ex-situ treatment system according to claim 4, wherein: and the leaching solution adopted by the leaching module during leaching is one or more of clear water, an ethylene diamine tetraacetic acid solution and a citric acid solution.
6. The municipal pipe gallery sludge ex-situ treatment system according to claim 4, wherein: the screening module comprises a first-stage vibrating screen, a second-stage vibrating screen, a first-stage swirler and a second-stage swirler which are sequentially connected in series; and the sludge obtained by screening of the second-stage cyclone is conveyed to a dehydration module through a lifting pump.
7. The municipal pipe gallery sludge ex-situ treatment system according to claim 6, wherein: the first-stage vibrating screen screens pebbles with the particle size larger than 1 mm; screening coarse sand with the size of 1 mm-600 mu m by the second-stage vibrating screen; the first-stage cyclone is used for screening medium sand of 600-300 mu m; and screening fine sand with the particle size of 300-75 microns by the secondary cyclone.
8. The municipal pipe gallery sludge ex-situ treatment system according to claim 1, wherein: the dehydration module comprises a sludge sedimentation tank, a conditioning tank and a dehydrator which are sequentially connected through pipelines, and the dehydrator and the sludge sedimentation tank are respectively connected to the tail water treatment module through respective pipelines; a stirring device is arranged in the conditioning tank;
the sludge obtained by the screening module is conveyed to a sludge sedimentation tank through a pipeline, and is sedimentated by the sludge sedimentation tank to obtain lower layer slurry, the lower layer slurry in the sludge sedimentation tank is conveyed to a conditioning tank and a dehydrator in sequence through the pipeline, and is dehydrated by the dehydrator to obtain tail water and a sludge cake; and tail water obtained after dehydration and upper layer tail water obtained after sedimentation in a sludge sedimentation tank enter a tail water treatment module.
9. The municipal pipe gallery sludge ex-situ treatment system according to claim 8, wherein: the tail water treatment module comprises a tail water sedimentation tank and tail water integrated treatment equipment, tail water obtained after dehydration of the dehydrator and upper layer tail water obtained after sedimentation of the sludge sedimentation tank both enter the tail water sedimentation tank, and upper layer tail water obtained after sedimentation of the tail water sedimentation tank enters the tail water integrated treatment equipment;
the tail water integrated treatment equipment is provided with a tail water inlet, a medicament inlet and a medicament outlet, and the treated tail water is discharged from the outlet; the outlet is connected to the screening module by a conduit.
10. The municipal pipe gallery sludge ex-situ treatment system according to claim 9, wherein:
a first medicament is added into the sludge collection module, and a second medicament is added into the tail water integrated treatment equipment; a conditioner is added into the conditioning tank;
the first medicament comprises a stabilizer, an oxidant, a reducing agent, a conditioner and a flocculating agent; the second medicament comprises a stabilizing agent, an oxidizing agent, a reducing agent and a flocculating agent;
the stabilizer is one or more of an alkaline stabilizer, a phosphate stabilizer, a sulfide stabilizer, an iron salt stabilizer, a silicate stabilizer, a mineral stabilizer and biochar;
the oxidant is a Fenton reagent;
the reducing agent is sulfite;
the conditioner is polyferric chloride and polyacrylamide;
the flocculant is polyaluminium chloride and polyacrylamide.
11. The municipal pipe gallery sludge ex-situ treatment system according to claim 9, wherein: the treatment system also comprises a medicament preparation module, wherein the medicament preparation module is used for preparing medicaments required by biochemical treatment of the conditioning pool, the sludge collection module and the tail water treatment module; the medicine preparation module comprises a medicine dissolving device and a water storage tank, the medicine dissolving device is provided with a stirring device, a raw material inlet, a water inlet and a medicament outlet, the stirring device is arranged in the medicine dissolving device, and the water inlet is communicated with the water storage tank; and the agent outlet is respectively connected with the tail water integrated treatment equipment, the conditioning tank and the sludge collecting module through pipelines.
12. The municipal pipe gallery sludge ex-situ treatment system according to claim 1, wherein: the treatment system further comprises a recycling module, and the recycling module is used for recycling the mud cakes obtained by the dehydration module.
13. The ectopic sludge treatment method for the urban pipe gallery is characterized by comprising the following steps of: the method comprises the following specific steps:
s1: collecting the discharged sludge by a sludge collecting module, and homogenizing and uniformly treating the sludge;
s2: the sludge obtained in the step S1 is subjected to multi-stage screening and impurity removal by adopting a screening module;
s3: dewatering and volume reduction treatment are carried out on the sludge obtained in the step S2 by adopting a dewatering module to obtain tail water and a mud cake;
s4: and carrying out biochemical treatment on the tail water by adopting a tail water treatment module.
14. The ectopic sludge treatment method for the urban pipe gallery according to claim 13, is characterized in that: the dehydration module in the step S3 comprises a sludge sedimentation tank, a conditioning tank and a dehydrator which are sequentially connected through pipelines, wherein the dehydrator and the sludge sedimentation tank are respectively connected to the tail water treatment module through respective pipelines; the specific process of step S3 is as follows: conveying the sludge obtained by the screening module to a sludge sedimentation tank through a pipeline, conditioning the lower layer of sludge obtained after sedimentation in a conditioning tank, dehydrating the sludge through a dehydrator, and dehydrating the sludge to obtain tail water and a sludge cake; and tail water obtained after dehydration and upper layer tail water obtained after sedimentation in a sludge sedimentation tank enter a tail water treatment module for biochemical treatment.
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| CN202110886568.8A CN113683274A (en) | 2021-08-03 | 2021-08-03 | System and method for ex-situ treatment of sludge in urban pipe gallery |
| PCT/CN2021/113395 WO2023010616A1 (en) | 2021-08-03 | 2021-08-19 | System and method for ex-situ treatment of urban pipe gallery sludge |
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