CN110510809B - Domestic sewage advanced treatment system without using chemical agent and disinfectant - Google Patents

Abstract

The invention relates to the technical field of sewage treatment, in particular to a domestic sewage advanced treatment system without using chemical agents and disinfectants. When the domestic sewage is treated, the sewage treated by the primary treatment system and the secondary treatment system sequentially enters the second boiling bed separator and the nanofiltration device, and suspended matters, soluble organic matters, microorganisms, viruses and other substances in the effluent treated by the secondary treatment system are removed, so that the standard of discharging the effluent into a natural water body or recycling the effluent is achieved. The advanced treatment of the domestic sewage can be completed only by the second fluidized bed separator and the nanofiltration device, a coagulating sedimentation tank and a disinfection tank do not need to be built, the structure is simple, and the occupied area is small; chemical agents and disinfectants are not needed, the treatment effect is not easily affected by water quality and environmental conditions, and the treatment effect of sewage is improved.

Description

Domestic sewage advanced treatment system without using chemical agent and disinfectant

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a domestic sewage advanced treatment system without using chemical agents and disinfectants.

Background

The urban domestic sewage is collected and conveyed to a sewage treatment plant by an urban pipe network system and is treated in the sewage treatment plant. At present, a domestic sewage treatment system of a sewage treatment plant comprises a primary treatment system, a secondary treatment system and an advanced treatment system which are sequentially connected. The primary treatment system comprises a coarse grating component, a fine grating component and an aeration grit chamber which are sequentially connected together; the secondary treatment system comprises a biochemical tank and a sedimentation tank which are connected in sequence, wherein the biochemical tank is connected with the aeration grit chamber, and the sedimentation tank is connected with the advanced treatment system; the advanced treatment system comprises a coagulating sedimentation tank and a disinfection tank which are connected in sequence. The specific treatment is as follows: the domestic sewage firstly passes through the coarse grid component and the fine grid component to remove coarse floaters and suspended matters in the sewage, then the sewage enters the aeration grit chamber, the sewage in the aeration grit chamber advances in a spiral flowing mode to further remove sand grains, meanwhile, part of organic pollution in the sewage is removed, then the effluent enters a biochemical tank to be subjected to secondary treatment, the biochemical tank contains a large amount of microorganisms, the microorganisms decompose and metabolize degradable organic matters in the sewage to grow and aggregate to form active sludge, and the treated sewage enters the sedimentation tank to separate sludge and water, so that primary treatment and secondary treatment of the sewage are completed; the sewage after primary treatment and secondary treatment also contains some substances such as micro suspended matters, colloids, microorganisms, viruses, heavy metals, eutrophic nitrogen and phosphorus and the like, so that advanced treatment is required to achieve the discharge standard of the sewage; and then the sewage from the secondary treatment system sequentially enters a coagulation sedimentation tank and a disinfection tank, the sewage can be discharged into a natural water body or recycled after being disinfected and sterilized in the disinfection tank, and the residual sludge in the sedimentation tank directly enters a sludge treatment system for treatment and then is discharged outside.

The sewage treated by the primary treatment system and the secondary treatment system enters an advanced treatment system for advanced treatment, and then can be discharged into a natural water body or recycled. At present, the treatment mode in a coagulating sedimentation tank and a disinfection tank is to add medicaments according to the water quality condition to achieve the aim of removing pollutants. Adding a coagulant into the coagulating sedimentation tank, wherein aluminum salt is usually selected; the disinfectant is added into the disinfection tank, usually liquid chlorine, sodium hypochlorite, chlorine dioxide and the like are selected, the effect of removing pollutants by adding the medicament is easily influenced by the quality of sewage, the sewage treatment effect is deteriorated if the regulation and control are improper, the sewage treatment cost is increased, meanwhile, the coagulating sedimentation tank and the disinfection tank not only occupy large areas, but also can possibly generate other adverse effects when the medicament is used, for example, when aluminum salt is used as a coagulant, the concentration of aluminum ions in the effluent is increased, and certain influence is generated on the health of animals, plants and human bodies; chlorine dioxide has the characteristics of easy volatilization and easy explosion, needs to be prepared and used on site, and has too complex process and inconvenient use.

Disclosure of Invention

The invention aims to solve the technical problem of providing a domestic sewage advanced treatment system which is simple in structure, convenient to use and good in treatment effect, and chemical agents and disinfectants are not used in the domestic sewage advanced treatment system.

The technical scheme adopted by the invention for solving the technical problems is as follows: a domestic sewage advanced treatment system without using chemical agents and disinfectants comprises a second boiling bed separator and a nanofiltration device, wherein the nanofiltration device is connected with the second boiling bed separator.

The second boiling bed separator comprises a shell, a first water inlet, a first water outlet, a separation medium bed layer and a discharge distributor, wherein the first water inlet is arranged at the top of the shell, the first water outlet is arranged at the bottom of the shell, the separation medium bed layer and the discharge distributor are arranged in the shell, and the separation medium bed layer is arranged on the discharge distributor.

Further, the discharging distributor comprises a partition plate and a water cap arranged on the partition plate.

The first water inlet is provided with a first valve, the first water outlet is provided with a second valve, the second boiling bed separator further comprises a gas inlet, a cleaning water inlet and a cyclone three-phase separator, the gas inlet and the cleaning water inlet are both arranged at the bottom of the shell, a third valve is arranged at the gas inlet, a fourth valve is arranged at the cleaning water inlet, the cyclone three-phase separator is arranged in the shell, and the cyclone three-phase separator is located at the top of the shell.

Further, the cyclone three-phase separator comprises a fourth device body, a feeding hole, a sewage draining port and an air outlet, wherein the feeding hole is formed in the bottom of the fourth device body, the air outlet is formed in the top of the fourth device body, the sewage draining port is formed in the side portion of the fourth device body, a fifth valve is arranged at the feeding hole, a sixth valve is arranged at the sewage draining port, and a seventh valve is arranged at the air outlet.

Further, the separation medium bed comprises a granular separation medium, and the particle size of the separation medium is between 0.1 and 0.2 mm.

The invention has the beneficial effects that: the advanced sewage treatment system without using chemical agents and disinfectants comprises a second boiling bed separator and a nanofiltration device, and during domestic sewage treatment, sewage treated by a primary treatment system and a secondary treatment system sequentially enters the second boiling bed separator and the nanofiltration device, and suspended matters, soluble organic matters, colloids, organic matters, total nitrogen, microorganisms, viruses and other substances in the effluent treated by the secondary treatment system are removed, so that the standard of discharging the effluent into a natural water body or recycling the effluent is achieved. Therefore, the advanced treatment system can finish the advanced treatment of the domestic sewage only by the second fluidized bed separator and the nanofiltration device, does not need to build a coagulating sedimentation tank and a disinfection tank, does not need to use chemical agents and disinfectants, has a treatment effect which is not easily influenced by water quality and environmental conditions, improves the treatment effect of the sewage, has a simple structure, a small occupied area of the advanced treatment system, can reuse a separation medium bed layer, has low cost, is easy to realize automation, has high efficiency, and is beneficial to popularization.

Drawings

FIG. 1 is a schematic view showing a flow structure of a domestic sewage treatment system;

FIG. 2 is a schematic diagram of the structure of a second ebullated bed separator;

FIG. 3 is a schematic view of a second ebullated bed separator in a purge state;

FIG. 4 is a schematic diagram of a cyclone three-phase separator;

FIG. 5 is a schematic of the structure of a shaped coalescer;

FIG. 6 is a schematic structural view of a second cyclonic separator;

FIG. 7 is a schematic of the structure of a first cyclone separator and a sorting column;

parts, positions and numbers in the drawings: a coarse grating component 11, a fine grating component 12, a first boiling bed separator 13, a collector 14, a shape coalescer 15, a third container 151, a second water inlet 152, a second water outlet 153, a purified oil outlet 154, a fluid uniform distributor 155, a coarse granulation module 156, a rapid separation module 157, a depth separation module 158, an oil storage tank 16, a biochemical pond 21, a sedimentation tank 22, a second cyclone separator 23, a second container 231, a second feed pipe 232, a second underflow port 233, a second overflow port 234, a power pump 24, a second boiling bed separator 31, a housing 311, a first water inlet 312, a first water outlet 313, a separation bed medium 314, a discharge distributor 315, a partition plate 3151, a water cap 3152, a gas inlet 316, a cleaning water inlet 317, a cyclone three-phase separator 318, a fourth container 3181, a feed inlet 3182, a sewage outlet 3183, a gas outlet 3184, a nano-filter device 32, a sludge storage tank 41, a belt dewaterer 42, a sludge storage tank 42, a purified water extractor 42, a purified water outlet 154, a purified water outlet 155, a fluid uniform distributor 155, a fluid distributor 155, a cyclone separator 155, a third overflow outlet 234, a power pump 24, a depth separator 31, a depth separator, a water inlet, a water outlet, a water inlet, a water outlet, a water inlet, a water outlet, a water inlet, a water cap, a water outlet, a water cap, a, A hot gas generating device 43, a first cyclone 44, a first body 441, a first feeding pipe 442, a first underflow port 443, a first overflow port 444, a gas-liquid separator 45, and a separation column 46.

Detailed Description

The invention will be further explained with reference to the drawings.

As shown in figure 1, the domestic sewage treatment system comprises a primary treatment system, a secondary treatment system and a deep treatment system. The primary treatment system is connected with the secondary treatment system, the advanced treatment system comprises a second boiling bed separator 31 and a nanofiltration device 32, the second boiling bed separator 31 is connected with the secondary treatment system, and the nanofiltration device 32 is connected with the second boiling bed separator 31. When domestic sewage is treated, the sewage is treated by a primary treatment system, a secondary treatment system, a second boiling bed separator 31 and a nanofiltration device 32 in sequence, and the advanced sewage treatment system does not use chemical agents or disinfectants.

Suspended matters and partial soluble organic matters in the effluent treated by the secondary treatment system are removed by a separation medium bed layer in the second boiling bed separator 31, and then suspended matters, colloid, organic matters and total nitrogen in the sewage are further removed by a nanofiltration device 32, and substances such as microorganisms and viruses are removed until the substances reach the standard of being discharged into natural water or recycled. One preferred embodiment of the second ebullated bed separator 31 of the present invention is: as shown in fig. 2, the second ebullated bed separator 31 includes a housing 311, a first water inlet 312, a first water outlet 313, a separation medium bed 314, and a discharge distributor 315, the first water inlet 312 is disposed at the top of the housing 311, the first water outlet 313 is disposed at the bottom of the housing 311, the separation medium bed 314 and the discharge distributor 315 are disposed in the housing 311, and the separation medium bed layer 314 is arranged on the discharging distributor 315, the separation medium bed layer 314 is a granular separation medium, the granular separation medium is preferably spherical, the particle size of the separation medium is between 0.1 and 0.2mm, the separation medium bed layer 314 is formed by one or more granular separation media, the material is organic or inorganic material with strong adsorbability to pollutants in sewage, especially has strong adsorbability to suspended matters and partial soluble organic matters in sewage, such as anthracite, active carbon and the like. The sewage treated by the fine grid assembly 12 enters the shell 311 from the first water inlet 312, the sewage sequentially passes through the separation medium bed layer 314 and the discharge distributor 315, and finally exits from the water outlet 313, and the separation medium bed layer 314 intercepts and adsorbs suspended matters and partial soluble organic matters in the sewage, so that the concentrations of the suspended matters and the partial soluble organic matters in the sewage are gradually reduced until the treatment requirement is met.

For convenience of installation and use, as shown in fig. 2 again, the discharging distributor 315 includes a partition plate 3151 and a water cap 3152 disposed on the partition plate 3151, the partition plate 3151 is transversely fixed in the housing 311, and the sewage passes through the separation medium bed 314 and then exits through the water cap 3152.

In order to reduce the cost of sewage treatment, realize the reuse of the separation medium in the separation medium bed 314 and improve the service life of the separation medium, a first valve may be further disposed at the first water inlet 312, a second valve is disposed at the first water outlet 313, the second ebullated bed separator 31 is further provided with a gas inlet 316, a cleaning water inlet 317 and a cyclone three-phase separator 318, the gas inlet 316 and the cleaning water inlet 317 are both disposed at the bottom of the housing 311, the gas inlet 316 is provided with a third valve, the cleaning water inlet 317 is provided with a fourth valve, the cyclone three-phase separator 318 is disposed in the housing 311, and the cyclone three-phase separator 318 is located at the top of the housing 311, as shown in fig. 4, the cyclone three-phase separator 318 includes a fourth body 3181, a feed inlet 3182, a sewage drain 3183 and a gas outlet 3184, the feed inlet 3182 is disposed at the bottom of the fourth body 3181, the gas outlet 3184 is disposed at the top of the fourth body 3181, the drain 3183 is arranged at the side of the fourth body 3181, the feed inlet 3182 is provided with a fifth valve, the drain 3183 is provided with a sixth valve, and the air outlet 3184 is provided with a seventh valve. After the second ebullated bed separator 31 is used for a period of time, a lot of pollutants are adsorbed on the surface of the separation medium in the separation medium bed layer 314, and the separation medium bed layer 314 needs to be backwashed to realize regeneration of the separation medium, so as to achieve the purpose of reuse of the separation medium, and the backwashing specifically comprises: closing the first valve and the second valve, opening the third valve, the fourth valve, the fifth valve, the sixth valve and the seventh valve, introducing the cleaning water liquid with a certain pressure into the shell 311 from the cleaning water inlet 317, and gas with certain pressure is introduced into the shell 311 from the gas inlet 316, the cleaning water liquid and the gas pass through the discharging distributor 315 and boil the granular separation medium from bottom to top, as shown in fig. 3, the contaminant-laden separation media enters the fourth body 3181 of the cyclonic three-phase separator 318 from the inlet 3182, the separation medium and the pollutants are thoroughly separated by the rotation and revolution coupling strengthening of the particles in the fourth device body 3181, the pollutants are discharged from the sewage outlet 3183 and enter a sludge treatment system for treatment, the gas is discharged from the gas outlet 3184, and the separation medium flows back to the discharge distributor 315 to form a separation medium bed 314 again. After the regeneration of the separation medium bed layer 314 is finished, the third valve, the fourth valve, the fifth valve, the sixth valve and the seventh valve are closed, and the first valve and the second valve are opened, so that the advanced treatment of the sewage is performed. For convenience of use, the valves are controlled by a controller.

In summary, the advanced treatment system of the domestic sewage treatment system of the present invention includes the second ebullated bed separator 31, when domestic sewage is treated, the sewage treated by the primary treatment system and the secondary treatment system sequentially enters the second ebullated bed separator 31 and the nanofiltration device 32, the separation medium bed 314 in the second ebullated bed separator 31 removes suspended matters and partial soluble organic matters in the effluent of the secondary treatment system, and then the sewage further removes suspended matters, colloids, organic matters, total nitrogen, and substances such as microorganisms and viruses through the nanofiltration device 32, thereby achieving the standard of discharging the sewage into natural water or recycling. Therefore, the advanced treatment of sewage treatment can be completed only by the second fluidized bed separator 31 and the nanofiltration device 32, a coagulating sedimentation tank and a disinfection tank do not need to be built, chemical agents and disinfectants do not need to be used, the treatment effect is not easily influenced by water quality and environmental conditions, the treatment effect of sewage is improved, the structure is simple, the occupied area of an advanced treatment system is small, the separation medium bed layer 314 can be reused, the cost is low, automation is easy to realize, the efficiency is high, and popularization is facilitated.

One preferred mode of the primary treatment system of the present invention is: as shown in fig. 1, the primary treatment system includes a coarse grid assembly 11 and a fine grid assembly 12 which are connected together in sequence, the primary treatment system further includes a first ebullated bed separator 13, a collector 14, a shaped coalescer 15, and an oil storage tank 16, the first ebullated bed separator 13 and the second ebullated bed separator 31 have the same structure, the fine grid assembly 12 is connected with the first ebullated bed separator 13, the first ebullated bed separator 13 is connected with the shaped coalescer 15 and the collector 14, and the oil storage tank 16 is connected with the shaped coalescer 15. When the domestic sewage is treated, the domestic sewage is correspondingly treated by the coarse grating component 11, the fine grating component 12, the first boiling bed separator 13 and the shape coalescer 15 in sequence. In order to realize that sewage can sequentially pass through the coarse grating component 11, the fine grating component 12, the first boiling bed separator 13 and the shape coalescer 15, the coarse grating component 11 and the fine grating component 12, and material conveying devices are respectively arranged between the coarse grating component 11 and the fine grating component 12, between the fine grating component 12 and the first boiling bed separator 13 and between the first boiling bed separator 13 and the shape coalescer 15. The method specifically comprises the following steps: when domestic sewage is treated, sewage treated by the fine grid assembly 12 enters the first boiling bed separator 13, a separation medium bed layer in the first boiling bed separator 13 removes sand grains, solid suspended matters and partial organic matters in the sewage, and the sand grains and the solid suspended matters are conveyed to the collector 14 through the conveying device to be stored. And then the effluent enters a shape coalescer 15, emulsified oil in the sewage is subjected to demulsification, coalescence and separation in the shape coalescer 15 so as to be removed, the oil after demulsification enters an oil storage tank 16 through a conveying device for storage, and the emulsified oil in the sewage meets the treatment requirement so as to finish primary treatment of the domestic sewage. Therefore, the invention completes the removal treatment of sand grains and emulsified oil only by the first fluidized bed separator 13 and the shape coalescer 15, and obviously reduces the occupied area and the cost of a primary treatment system; first boiling bed separator 13 also facilitates the operation and uses, and the structure is simpler, can not produce a large amount of foul gas in the processing procedure, has improved clean environment, and simultaneously, a large amount of emulsified oil can get rid of, has reduced the influence to follow-up sewage treatment, improves sewage treatment effect.

The first ebullated bed separator 13 functions to remove sand, suspended solids and a portion of organic matter from the wastewater treated by the fine grate assembly 12. The first boiling bed separator 13 and the second boiling bed separator 31 have the same structure, the separation medium bed layer of the first boiling bed separator 13 is a granular separation medium, the granular separation medium is preferably spherical, the particle size of the separation medium is between 0.1 and 0.2mm, the separation medium bed layer is formed by one or more granular separation media, the material of the separation medium bed layer is organic or inorganic material which has stronger adsorbability to pollutants in sewage, and particularly has stronger adsorbability to sand grains and solid suspended matters in sewage, such as quartz sand, anthracite, activated carbon and the like.

The shape coalescer 15 is used for removing emulsified oil in the sewage, so that the oil content in the sewage meets the treatment requirement. One preferred way of forming the coalescer 15 of the invention is: as shown in fig. 5, the shape coalescer 15 includes a third container 151, a second water inlet 152, a second water outlet 153, and a purified oil outlet 154 are provided on the third container 151, a fluid uniform distributor 155, a coarse-grained module 156, a fast separation module 157, and a deep separation module 158 are sequentially provided inside the third container 151, when sewage is treated, the sewage enters the third container 151 through the second water inlet 152, the flow rate and the flow rate are adjusted through the fluid uniform distributor 155, and then the sewage passes through the coarse-grained module 156, the fast separation module 157, and the deep separation module 158 in sequence to achieve demulsification and separation of oil and water, the separated emulsified oil is stored in the oil storage tank 16 through the purified oil outlet 154, and the sewage flows out through the second water outlet 153 to enter subsequent treatment.

The preferred mode of the secondary treatment system of the invention is as follows: as shown in fig. 1, the secondary treatment system comprises a biochemical tank 21 and a sedimentation tank 22 which are connected in sequence, wherein the biochemical tank 21 is connected with the shape coalescer 15, and the sedimentation tank 22 is connected with the advanced treatment system and the sludge treatment system. The sewage treated by the shape coalescer 15 is treated by passing through the biochemical tank 21 and the sedimentation tank 22 in turn, and in order to realize that the sewage can be treated by passing through the biochemical tank 21 and the sedimentation tank 22 in turn, material conveying devices are arranged between the shape coalescer 15 and the biochemical tank 21 and between the biochemical tank 21 and the sedimentation tank 22. The biochemical tank 21 contains a large amount of microorganisms, the microorganisms decompose and metabolize degradable organic matters in the sewage, the microorganisms grow and aggregate to form activated sludge, the treated sewage enters the sedimentation tank 22, mud and water are separated in the sedimentation tank 22, the produced treated sewage finally enters the advanced treatment system for treatment, and the sludge left in the sedimentation tank 22 directly enters the sludge treatment system for treatment. The rest activated sludge in the sedimentation tank 22 contains a plurality of residues of microbial respiration and self-oxidation, organic matters which are difficult to degrade by microbes and the like on the surface, the residues are gathered on the surface of the activated sludge to form extracellular polymeric substances, the extracellular polymeric substances wrap the microbes inside, and the organic matters degraded by the microbes are influenced, so that the activity of the activated sludge is reduced, the rest activated sludge in the sedimentation tank directly enters a sludge treatment device for treatment and then is transported outside, the waste of resources such as the activated sludge and the microbes which have higher activity loss in the treatment process is avoided, the resource utilization rate is lower, and the municipal domestic sewage treatment cost is increased. It is found from a great deal of practice that, as shown in fig. 1 and fig. 6, the secondary treatment system of the present invention further includes a second cyclone separator 23 and a power pump 24, the second cyclone separator 23 includes a second body 231 and a second feeding pipe 232, the second feeding pipe 232 is vertically disposed at the side of the second body 231, one side of the second body 231 is provided with a second underflow port 233, the other side is provided with a second overflow port 234, one end of the power pump 24 is connected with the sludge outlet of the sedimentation tank 22 through a pipeline, the other end of the power pump 24 is connected with the second feeding pipe 232 of the second cyclone separator 23, the second underflow port 233 is connected with the biochemical tank 21 through a pipeline, and the second overflow port 234 is connected with the sludge treatment system through a pipeline. The power pump 24 conveys the residual activated sludge in the sedimentation tank 22 to the second cyclone separator 23, the activated sludge enters the second device 231 from the second feeding pipe 232 and generates a high-speed rotating field in the second device 231, extracellular polymers wrapped on the outer surface of the activated sludge are under the action of the high-speed rotating field, part of the extracellular polymers fall off from the outer surface of the activated sludge under the coupling action of rotation and revolution, the fallen extracellular polymers are discharged out of the second overflow port 234 of the second cyclone separator 23 due to light weight, the rest of the activated sludge flows out of the second bottom flow port 233 of the second cyclone separator 23 and flows back to the biochemical tank 21, and due to the falling of part of the extracellular polymers wrapped on the outer surface of the activated sludge, microorganisms in the sewage are reattached to the surface of the activated sludge and can be used for degrading organic matters in the sewage again, thereby improving the activity of the residual activated sludge in the sedimentation tank 22, and the activity of the activated sludge is improved by at least 15 percent after the activated sludge is detected and treated by the cyclone separator. The second cyclone separator 23 can not only improve the activity of the activated sludge, but also optimize the cyclone strength by adjusting the split flow ratio of the second cyclone separator 23, so as to realize sludge active separation, i.e. screening out the activated sludge with higher activity, screening out the sludge with lower activity, entering a sludge treatment system for treatment, further improving the activity of the activated sludge flowing back to the biochemical tank 21, and improving the degradation efficiency in the biochemical tank 21. Therefore, the invention avoids the direct waste of the residual activated sludge in the sedimentation tank 22, improves the utilization rate of resources, reduces the consumption of microorganisms, reduces the cost of the whole secondary treatment system, and simultaneously improves the degradation efficiency in the biochemical tank. After a lot of experiments and practices, the activity of the activated sludge is improved by at least 20% after the activated sludge left in the sedimentation tank 22 is treated by the second cyclone separator 23 by horizontally arranging the first container 231, vertically arranging the second feeding pipe 232 at the side of the first container 231, arranging the second underflow port 233 at the left side of the first container 231 and arranging the second overflow port 234 at the right side of the first container 231.

Because the secondary treatment system and the advanced treatment system both generate sludge which must be treated, the sludge treatment system of the invention preferably adopts a mode that: as shown in fig. 1 and 7, the sludge treatment system includes a sludge storage tank 41, a belt dewaterer 42, a hot gas generator 43, a gas-liquid separator 45, and a plurality of first cyclone separators 44 connected in series in sequence, the sludge storage tank 41 is connected with the secondary treatment system and the belt dewaterer 42, the first cyclone separators 44 include a first body 441 and a first feed pipe 442, the first feed pipe 442 is vertically arranged at the side of the first body 441, the bottom of the first body 441 is provided with a first bottom flow port 443, the top of the first body is provided with a first overflow port 444, the hot gas generator 43 and the belt dewaterer 42 are both connected with the first feed pipe 442 of the first cyclone separator 44 arranged at the first position along the flowing direction of the sludge, and all the first overflow ports 444 are connected with the gas-liquid separator 45.

The secondary treatment system and the advanced treatment system both generate certain sludge, during sludge treatment, the sludge generated by the secondary treatment system and the advanced treatment system is conveyed into the sludge storage tank 41 through the material conveying device, the sludge in the sludge storage tank 41 enters the belt type dehydrator 42 through the material conveying device for primary treatment, the belt type dehydrator 42 can remove part of water content in the sludge, reduce the viscosity of the sludge, reduce the interaction force between water and solid particles, and improve the dispersibility of sludge particles; then the sludge primarily treated by the belt dewaterer 42 enters a first cyclone separator 44 for treatment through a material conveying device, simultaneously, a hot gas medium generated by the work of a hot gas generating device 43 is introduced into the first cyclone separator 44, the hot gas medium can further reduce the viscosity of the sludge, the first cyclone separator 44 works, a high-speed rotating field is generated in a first device body 441 under the action of the hot gas medium, the solid particles of the sludge generate high-speed rotation and revolution motion in the high-speed cyclone field under the action of the high-speed rotating field, the generated centrifugal force overcomes the capillary resistance of water adsorbed among the solid particles, the solid particles in the sludge are firstly separated from the water, the water and the gas medium removed from the sludge enter a gas-liquid separator 45 through a first overflow port 444 at the top, and the gas-liquid separation is realized in the gas-liquid separator 45, the sludge enters the second first cyclone separator 44 from the first underflow opening 443 of the first cyclone separator 44, and after passing through the plurality of first cyclone separators 44 connected together in series in sequence, the sludge realizes multiple separation of solid particles and water in the sludge, thereby meeting the requirement of subsequent treatment on the water content of the sludge; compared with the mode of removing water in the sludge by thermal drying and thermal evaporation, the sludge treatment system has the advantages of simple structure, relatively low energy consumption, higher dehydration efficiency in unit time, reduced cost of the sewage treatment system, small occupied area, simple equipment and easy operation.

The belt dewaterer 42 performs primary treatment on the sludge to remove part of the water content in the sludge, so that the water content of the sludge is reduced to 80 percent or even lower when the water content is 99 percent. The hot gas generating device 43 is capable of generating a hot gas medium, which is obtained by a large number of practices, wherein the heating temperature of the hot gas medium ranges from 60 ℃ to 80 ℃, and the hot gas medium can be air, nitrogen, hydrogen and the like. The plurality of first cyclonic separators 44 connected together in series in this order are referred to as: in the sludge flow direction, the first underflow port 443 of the first cyclone 44 is connected to the first inlet pipe 442 of the second first cyclone 44, the first underflow port 443 of the second first cyclone 44 is connected to the first inlet pipe 442 of the third first cyclone 44, and so on until the first underflow port 443 of the penultimate first cyclone 44 is connected to the first inlet pipe 442 of the last first cyclone 44. Through a large number of practices, when the rotation speed range of the solid particles of the sludge in the high-speed rotational flow field is 20000r/min-60000r/min, the sludge treatment system only needs two first rotational flow separators 44 which are connected together in series, and the water content of the sludge can be reduced to below 20% by the two first rotational flow separators 44. In order to further reduce the water content of the sludge, the present invention is further provided with a separation column 46, wherein the first underflow opening 443 of the first cyclone 44 arranged in the first row is connected with the feed opening of the separation column 46, and the discharge opening of the separation column 46 is connected with the first feed pipe 442 of the other first cyclone 44 along the sludge flowing direction. After passing through the first cyclone separator 44, the sludge undergoes non-phase-change dehydration drying, the moisture content and volume of the sludge are changed, the sludge is driven by a hot gas medium to enter the separation column 46, the light sludge with smaller volume and containing a small amount of moisture continues to enter the other first cyclone separator 44 along with the hot gas medium in the separation column 46 for drying, the large sludge still containing more moisture sinks in the separation column 46 due to the heavier volume, the sunk sludge is treated by other modes, the separation column 46 finishes the separation effect on the sludge, and the finally obtained sludge drying effect is ensured.

Claims (4)

1. The utility model provides a domestic sewage's processing system, includes primary treatment system, secondary treatment system, sludge treatment system, primary treatment system is including thick grid subassembly (11), fine grid subassembly (12) that link together in proper order, and secondary treatment system is including biochemical pond (21), sedimentation tank (22) that connect gradually, and biochemical pond (21) are connected with primary treatment system, primary treatment system still includes first boiling bed separator (13), collector (14), shape coalescer (15), oil storage tank (16), and fine grid subassembly (12) are connected with first boiling bed separator (13), and first boiling bed separator (13) are connected with shape coalescer (15), collector (14), and oil storage tank (16) are connected with shape coalescer (15);

the secondary treatment system also comprises a second cyclone separator (23) and a power pump (24), the second cyclone separator (23) comprises a second device body (231) and a second feeding pipe (232), the second feeding pipe (232) is arranged on the side part of the second device body (231), one side of the second device body (231) is provided with a second underflow port (233), the other side of the second device body is provided with a second overflow port (234), one end of the power pump (24) is connected with a sludge outlet of the sedimentation tank (22) through a pipeline, the other end of the power pump (24) is connected with the second feeding pipe (232) of the second cyclone separator (23), the second underflow port (233) is connected with the biochemical pool (21) through a pipeline, and the second overflow port (234) is connected with the sludge treatment system through a pipeline;

the advanced treatment system is connected with the secondary treatment system and the sludge treatment system, the advanced treatment system comprises a second boiling bed separator (31) and a nanofiltration device (32), the second boiling bed separator (31) and the first boiling bed separator (13) have the same structure, the sedimentation tank (22) is connected with the second boiling bed separator (31), and the nanofiltration device (32) is connected with the second boiling bed separator (31);

the second boiling bed separator (31) comprises a shell (311), a first water inlet (312), a first water outlet (313), a separation medium bed layer (314) and a discharge distributor (315), wherein the first water inlet (312) is arranged at the top of the shell (311), the first water outlet (313) is arranged at the bottom of the shell (311), the separation medium bed layer (314) and the discharge distributor (315) are arranged in the shell (311), the separation medium bed layer (314) is arranged on the discharge distributor (315), and the discharge distributor (315) comprises a partition plate (3151) and a water cap (3152) arranged on the partition plate (3151);

the sludge treatment system comprises a sludge storage tank (41), a belt type dewaterer (42), a hot gas generating device (43), a gas-liquid separator (45) and two first cyclone separators (44) which are sequentially connected in series, the sludge storage tank (41) is connected with the secondary treatment system and the belt type dehydrator (42), the first cyclone separator (44) comprises a first body (441) and a first feeding pipe (442), the first feeding pipe (442) is vertically arranged at the side part of the first body (441), the bottom of the first body (441) is provided with a first underflow port (443), the top of the first body is provided with a first overflow port (444), the hot gas generating device (43) and the belt type dehydrator (42) are both connected with the first feeding pipe (442) of the first cyclone separator (44) arranged at the first one along the flowing direction of sludge, and all the first overflow ports (444) are connected with the gas-liquid separator (45);

the sludge treatment system also comprises a separation column (46), and a first underflow opening (443) of the first cyclone separator (44) arranged in the first row is connected with the feeding opening of the separation column (46) along the flowing direction of the sludge, and the discharging opening of the separation column (46) is connected with the first feeding pipe (442) of the other first cyclone separator (44).

2. The domestic sewage treatment system of claim 1, wherein: the first valve is arranged at the first water inlet (312), the second valve is arranged at the first water outlet (313), the second fluidized bed separator (31) further comprises a gas inlet (316), a cleaning water inlet (317) and a cyclone three-phase separator (318), the gas inlet (316) and the cleaning water inlet (317) are both arranged at the bottom of the shell (311), a third valve is arranged at the gas inlet (316), a fourth valve is arranged at the cleaning water inlet (317), the cyclone three-phase separator (318) is arranged in the shell (311), and the cyclone three-phase separator (318) is located at the top of the shell (311).

3. The domestic sewage treatment system of claim 1, wherein: the cyclone three-phase separator (318) comprises a fourth body (3181), a feed inlet (3182), a sewage outlet (3183) and an air outlet (3184), wherein the feed inlet (3182) is arranged at the bottom of the fourth body (3181), the air outlet (3184) is arranged at the top of the fourth body (3181), the sewage outlet (3183) is arranged at the side part of the fourth body (3181), a fifth valve is arranged at the feed inlet (3182), a sixth valve is arranged at the sewage outlet (3183), and a seventh valve is arranged at the air outlet (3184).

4. A domestic sewage treatment system according to any one of claims 1 to 3 wherein: the separation medium bed (314) comprises a granular separation medium with a particle size of 0.1-0.2 mm.

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