CN211688776U - Processing system of nitrogen phosphorus nutritive salt pollution bed mud - Google Patents
Processing system of nitrogen phosphorus nutritive salt pollution bed mud Download PDFInfo
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- CN211688776U CN211688776U CN201921888858.0U CN201921888858U CN211688776U CN 211688776 U CN211688776 U CN 211688776U CN 201921888858 U CN201921888858 U CN 201921888858U CN 211688776 U CN211688776 U CN 211688776U
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Abstract
The utility model provides a treatment system for bottom mud polluted by nitrogen and phosphorus nutritive salt, which mainly comprises a pretreatment area for treating the mud, wherein after the mud is treated by the pretreatment area, the sludge is conveyed to the screw-overlapping type sludge dewatering machine through a sludge lifting pump, the sludge is dewatered to form a mud cake after the front end of the screw-overlapping type sludge dewatering machine is mixed and contacted with PAM powder, the filtrate in the pretreatment area and the sludge filtrate of the screw-overlapping type sludge dewatering machine are conveyed to a coagulation reactor through a filtrate lifting pump, also has PAM automatic medicine-adding device which respectively supplies medicine to the front end of the stack screw type sludge dewatering machine and the coagulation reactor, PAC medicine-adding device which respectively supplies medicine to the pretreatment area and the coagulation reactor, the mixed liquid of the coagulation reactor is conveyed to the magnetic separation equipment to complete the separation of slag and liquid, then the waste slag enters a magnetic recovery device to realize the separation of magnetic seeds and non-magnetic seeds, and the non-magnetic seeds are conveyed into the stacked screw type sludge dewatering machine again. The treatment of polluted bottom sludge and the rapid denitrification and dephosphorization are realized, the sludge treatment cost is effectively reduced, and the secondary pollution is avoided.
Description
Technical Field
The utility model relates to a pollute sediment and deal with and technology such as surplus water treatment emission mainly is applied to innoxious, minimizing and resourceful treatment that nitrogen phosphorus nutritive salt pollutes the sediment, refers in particular to a processing system that nitrogen phosphorus nutritive salt pollutes the sediment.
Background
The bottom mud is an important part of the water environment ecology of rivers and lakes. In many rural and rural areas, due to the factors that drainage pipe networks are unreasonably arranged, sewage intercepting pipelines are not perfectly equipped, sewage plants are slow to construct and the like, a lot of domestic sewage is directly discharged into surrounding rivers or lakes without being treated, so that the water quality is deteriorated, bottom mud is polluted, and death residues and excrement of various water biomasses are continuously deposited at the bottom to form huge endogenous pollution. As pollutants are accumulated and enriched continuously, the total amount of pollutants such as oxygen-consuming organic matters, nitrogen and phosphorus nutrient salts and the like in the polluted bottom sediment far exceeds the total amount of the pollutants in the overlying water, dynamic balance of absorption-release of nitrogen and phosphorus compounds mainly exists between the surface layers of the overlying water and the polluted bottom sediment, once environmental conditions are changed, the polluted bottom sediment releases the nitrogen and phosphorus compounds again in modes of desorption, diffusion and the like, and water eutrophication is caused, so that the water quality and the target accessibility of rivers and lakes are seriously influenced, and the expected restoration speed and the expected restoration effect are difficult to achieve.
The dredging of the sediment is an important measure for treating pollution sources of the polluted rivers and lakes. The main purpose of sediment dredging is to remove most pollutants contained in the sediment, reduce the pollutant release flux of the sediment to a water body and increase the water retention of rivers and lakes. The treatment and disposal of the polluted bottom mud are important measures for reducing the endogenous pollution of rivers and lakes.
From the view of the current technical methods aiming at the disposal of the desilting sludge, an in-situ treatment technology and an ex-situ treatment technology are mainly available. The in-situ treatment technology mainly comprises the steps of backfilling polluted bottom mud to the shore through dredging equipment, and adding a curing agent for dehydration and curing to form a revetment, so that the reduction, harmlessness and recycling of the polluted bottom mud are realized, but the in-situ treatment technology is limited by the hydrological conditions of a river channel, and the generated mud cannot be effectively treated in a part of areas where the river channel is narrow or the revetment is difficult to construct;
the heterotopic treatment technology mainly comprises leaching, vitrification, electric restoration, burning and the like, and the existing problems are that the application cost is high, certain market exists in developed countries, the heterotopic treatment technology is not popularized in China, and the amount of common river channel dredging engineering is huge due to the fact that most local land is short, so that the number of vacant land capable of being backfilled is small, and the influence of the transportation cost is large. Therefore, how to perform efficient treatment on the types of the bottom sludge and realize harmlessness, reduction and resource utilization become technical problems to be solved urgently in the industry.
The invention content is as follows:
an object of the utility model is to prior art current situation, provide a processing system of nitrogen phosphorus nutritive salt pollution bed mud, this system's processing procedure is brief high-efficient, can effectively reduce silt treatment cost, avoids secondary pollution, and equipment intensification degree is high, and area is less, reaches the purpose that pollutes the bed mud innoxious, minimizing, resourceization.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a processing system of nitrogen phosphorus nutritive salt pollution bed mud, mainly there is the preliminary treatment district of handling silt, silt is handled the back through preliminary treatment district, carry to folding spiral shell formula sludge dewaterer through the sludge hoist pump, silt dewaters and forms the mud cake after folding spiral shell formula sludge dewaterer front end and PAM powder mix contact, the filtrating in preliminary treatment district and the sludge filtrate who folds spiral shell formula sludge dewaterer pass through filtrating hoist pump and carry to the coagulation reactor in, PAM automatic reagent feeding device supplies the medicine for folding spiral shell formula sludge dewaterer front end and coagulation reactor respectively still has, PAC charge device supplies the medicine for preliminary treatment district and coagulation reactor respectively, the mixed liquid of coagulation reactor is carried and is accomplished the sediment liquid separation in the magnetic separation equipment, then get into the separation that realizes magnetic seed and non-magnetic seed in the magnetic recycling device, non-magnetic seed carries again and gets into in the spiral shell formula sludge dewaterer.
In the above scheme, the preliminary treatment district includes grid, operation platform and sludge adjusting tank, the grid is located operation platform one side top, and little in the middle of the big of operation platform both ends, the operation platform is the passageway that overflows of one section reduction in the middle of, and overflows the passageway top and be provided with agitating unit, PAC charge device's drug delivery to overflowing in the passageway.
Further, the sludge cake produced by the stacked spiral sludge dewatering machine is added with a curing agent through a curing agent adding device, and the sludge cake is dried and converted into planting soil.
Furthermore, the magnetic separation equipment adopts a circular rare earth magnetic disk, the magnetic separation equipment also comprises a slag scraping and planing wheel, and waste slag is scraped from the rare earth magnetic disk through the slag scraping and planing wheel and then transferred to the magnetic recovery device through the spiral conveying device.
Further, the magnetic seeds screened by the magnetic recovery device are conveyed to the coagulation reactor.
The utility model has the advantages that:
1. the sludge treatment method has strong pertinence, and is economical and practical. The treatment system mainly aims at sludge rich in nutrient salt (mainly nitrogen and phosphorus), sludge cakes formed after the treatment of the processes of concentration, dehydration, filter pressing and the like are solidified by a curing agent, loose fertile soil with physical, chemical and nutrient indexes up to the standard is formed, and the treatment system is suitable for seedling cultivation, landscaping and ecological revetment backfill and has higher practicability and economic feasibility.
2. Through leading fine grid gravity filtration, greatly reduced mechanical energy consumption, the surplus water treatment adopts the super magnetic separation water purification all-in-one to handle for the efficiency of coagulating, separation efficiency is high, uses with magnetism biological activity mud method simultaneously, has very high nitrogen and phosphorus removal effect, and this processing system intensification degree is high, and area is less.
3. The system realizes the integrated treatment of black and odorous sediment removal, quick sludge drying and residual water treatment, achieves the purposes of harmlessness, reduction and recycling of polluted sediment, reduces the sludge treatment capacity and treatment difficulty, prolongs the service life of equipment, has simple and efficient treatment process, effectively reduces the sludge treatment cost and avoids secondary pollution.
Description of the drawings:
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of the pretreatment area of the present invention.
The specific implementation mode is as follows:
please refer to fig. 1 and 2, which are schematic structural views of a preferred embodiment of the present invention, the present invention relates to a system for treating sediment contaminated by nitrogen and phosphorus nutritive salt, which is used to remove silt in areas such as rivers, lakes, underdrains, culverts, etc., a pump suction boat or a self-priming pump vehicle is first used to suck through a powerful suction pump, the pumped sludge is mainly the sediment surface layer and the suspension layer rich in contaminants, and the soil is mostly fluid-plastic and has a high water content. After bottom sediment detection, the sludge bottom sediment rich in organic matters and nitrogen and phosphorus nutrient salts is treated as follows:
the sludge produced by dredging is transported to a treatment site through a self-priming pump truck 15, the sludge firstly passes through a pretreatment area, the pretreatment area comprises a grating 1, an operation platform 2 and a sludge adjusting tank 3, the grid 1 is positioned above one side of the operation platform 2, the two ends of the operation platform 2 are large and small, the middle of the operation platform 2 is provided with a section of reduced overflowing channel, the overflowing channel has a certain gradient, sludge is automatically gravity-filtered through the grid to intercept main garbage and large granular impurities, the overflowing channel is provided with a stirring device 16 above a narrow channel, the medicine of the PAC medicine adding device 12 is conveyed into the overflowing channel, by adding PAC (polyaluminium chloride), colloid substances in the sludge are subjected to strong electric neutralization, hydrolysis products have excellent bridging adsorption effect on suspended matters in water and selective adsorption effect on soluble substances, and the middle stirring device 16 is used for enabling the sludge to be in more uniform and full contact with the polyaluminium chloride.
The sludge adjusting tank 3 is used for flocculation and sedimentation of the sludge after dosing, the sedimentation time is generally 12-24h, and the purpose is to primarily reduce the volume and the water content of the sludge and simultaneously enable floccules to naturally settle. The concentrated silt of sludge regulating reservoir 3 passes through sludge lift pump 4 and sends to fold spiral shell formula sludge dewaterer 5, PAM automatic reagent feeding device 10 realizes the automatic reagent feeding stirring, make behind polyacrylamide and silt all through metering tank regulation flow at fold spiral shell formula sludge dewaterer 5 front end flocculation incasement mix contact, further flocculation and sedimentation of silt has been accelerated and has been formed great alum blossom, improve dehydration efficiency greatly, the alum blossom of sending into is under the dual function of gravity concentration and pressure dehydration, it discharges to form the mud cake, its moisture content greatly reduced, the moisture content can reduce to 60% -70%.
The mud cake produced by the stacked spiral sludge dewatering machine 5 is added with the curing agent through the curing agent dosing device 13, after odor is stably eliminated, the physicochemical property is improved, after drying, the water content is less than 40%, the related physicochemical indexes and nutrient indexes reach the related standards of sludge disposal-mud quality for landscaping of CJ-248-2007 urban sewage treatment plant, and the treated mud is converted into the available planting soil 14 which can be used for seedling cultivation, landscaping, ecological revetment backfill soil and the like.
Filtrate (also called residual water) generated by filter pressing of sludge by the stacked spiral sludge dewatering machine 5 and supernatant of the sludge regulating tank are lifted to the ultra-magnetic separation water body purification all-in-one machine for treatment by the sludge lifting pump 4, and the ultra-magnetic separation water body purification all-in-one machine mainly comprises a coagulation reactor 7, a magnetic separation device 8 and a magnetic recovery device 9. PAM automatic reagent feeding device 10 and PAC charge device 12 are added into coagulation reactor 7 through respective preparation facilities and measuring pump ration, and the suspended solid in the waste water forms the alum blossom with the flocculating agent and combines with the magnetic seed again and forms magnetic little wadding group, and the flocculation mixed liquid of coagulation reactor 7 carries to accomplish the sediment liquid separation in magnetic separation equipment 8, and then the waste residue gets into magnetic recovery unit 9 and realizes the separation of magnetic seed and nonmagnetic seed, and nonmagnetic seed conveys again and gets into in fold spiral sludge dewaterer 5.
Specifically, the magnetic separation device 8 adopts the circular rare earth magnetic disk 81, so that the contact area between the micro magnetic floccules and the magnetic disk is enlarged, and the separation efficiency is improved. When sewage flows through the magnetic separation equipment, magnetic floccules formed by micro flocculation are subjected to the action of strong magnetic force on the magnetic disk, overcome resistance in water, are captured by the surface of the magnetic disk and are adsorbed on the surface of the magnetic disk. The magnetic separation equipment 8 further comprises a slag scraping and planing wheel 82, the rare earth magnetic disc 81 gradually rotates to separate out the suspended matters to be suspended from the water body, most of water is lost on the rare earth magnetic disc 81, when the magnetic separation and planing wheel 82 rotates, a magnetic separation slag discharging belt is formed, the slag scraping and planing wheel 82 scrapes the waste slag into the spiral conveying device 80, and then the waste slag is transferred to the magnetic recovery device 9.
The magnetic recovery device 9 mainly realizes the separation of magnetic seeds and non-magnetic seeds through a high-speed dispersion motor, the non-magnetic sludge is discharged from the lower part of a magnetic drum, the magnetic seeds enter a stirring cavity, are prepared into magnetic liquid and then return to the coagulation reactor 7 for a new round of magnetic flocculation, the recovery utilization rate of the magnetic seeds is generally more than or equal to 90 percent, and the non-magnetic sludge is conveyed to the front end of the stacked screw type sludge dehydrator 5 to be mixed with sludge and medicaments and then treated again.
The water quality of the residual water treated by the ultra-magnetic separation and water purification integrated machine meets the requirement of the discharge standard according to the secondary discharge standard of GB18918-2002 pollutant discharge standard of urban sewage treatment plants.
Of course, the above illustration is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, so all equivalent changes made in the principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a processing system of nitrogen phosphorus nutritive salt pollution bed mud, mainly has the preliminary treatment district of handling silt, its characterized in that: the sludge is treated by the pretreatment area and is conveyed to the spiral shell type sludge dewatering machine (5) through the sludge lifting pump (4), the sludge is dewatered to form mud cakes after the front end of the spiral shell type sludge dewatering machine (5) is mixed and contacted with PAM medicinal powder, filtrate in the pretreatment area and sludge filtrate in the spiral shell type sludge dewatering machine (5) are conveyed to the coagulation reactor (7) through the filtrate lifting pump (6), also comprises PAM automatic dosing device (10) which respectively supplies the drugs for the front end of the stack screw type sludge dewatering machine (5) and the coagulation reactor (7), PAC dosing device (12) which respectively supplies the drugs for the pretreatment area and the coagulation reactor (7), the mixed liquid of the coagulation reactor (7) is conveyed to the magnetic separation equipment (8) to complete the slag-liquid separation, then the waste slag enters a magnetic recovery device (9) to realize the separation of magnetic seeds and non-magnetic seeds, and the non-magnetic seeds are conveyed into a stacked screw type sludge dewatering machine (5) again.
2. The system for treating the sediment polluted by nitrogen and phosphorus nutrient salts as claimed in claim 1, wherein: pretreatment area includes grid (1), operation platform (2) and sludge adjusting tank (3), grid (1) is located operation platform (2) one side top, and operation platform (2) both ends are little in the middle of big, is the passageway that overflows of one section reduction in the middle of operation platform (2), and overflows the passageway top and be provided with agitating unit (16), and PAC charge device (12)'s medicine is carried to overflowing in the passageway.
3. The system for treating the sediment polluted by nitrogen and phosphorus nutrient salts as claimed in claim 1 or 2, wherein: and the mud cake produced by the stacked spiral sludge dewatering machine (5) is added with a curing agent through a curing agent adding device (13) and is converted into planting soil (14) after being dried.
4. The system for treating the sediment polluted by nitrogen and phosphorus nutrient salts as claimed in claim 1, wherein: the magnetic separation equipment (8) adopts a circular rare earth magnetic disk (81), the magnetic separation equipment (8) further comprises a slag scraping and planing wheel (82), and waste slag is scraped away from the rare earth magnetic disk (81) through the slag scraping and planing wheel (82) and then transferred to the magnetic recovery device (9) through the spiral conveying device (80).
5. The system for treating the sediment polluted by nitrogen and phosphorus nutrient salts as claimed in claim 1 or 4, wherein: and the magnetic seeds screened by the magnetic recovery device (9) are conveyed to the coagulation reactor (7).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110698031A (en) * | 2019-11-05 | 2020-01-17 | 汕头市弘东环境治理有限公司 | Processing system of nitrogen phosphorus nutritive salt pollution bed mud |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110698031A (en) * | 2019-11-05 | 2020-01-17 | 汕头市弘东环境治理有限公司 | Processing system of nitrogen phosphorus nutritive salt pollution bed mud |
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