CN113003861A - Municipal sewage treatment method and system - Google Patents
Municipal sewage treatment method and system Download PDFInfo
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- CN113003861A CN113003861A CN202110208088.6A CN202110208088A CN113003861A CN 113003861 A CN113003861 A CN 113003861A CN 202110208088 A CN202110208088 A CN 202110208088A CN 113003861 A CN113003861 A CN 113003861A
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F7/00—Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
- C02F3/327—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae characterised by animals and plants
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a municipal sewage treatment method and a municipal sewage treatment system, wherein the municipal sewage treatment method constructs the municipal sewage treatment system according to the existing wetland or artificial wetland, removes pollutants in the municipal sewage, such as grease, excrement and the like, by using animals and plants in the natural environment, reduces the content of nutrient elements in the municipal sewage, and can improve the local environment while carrying out sewage treatment. The municipal sewage treatment method combines the municipal sewage treatment with the construction of the municipal wetland, solves the problem of higher energy consumption of the existing municipal sewage treatment by constructing the sewage treatment system taking the artificial wetland as a main body, and simultaneously can combine the municipal sewage treatment with the environmental management to improve the urban environment on the basis of properly performing the sewage treatment.
Description
Technical Field
The invention relates to the technical field of sewage treatment. In particular to a municipal sewage treatment method and a system.
Background
In the sewage treatment process, compared with industrial wastewater, the municipal sewage (including domestic sewage and rainwater) treatment process is simpler, and generally comprises filtering, primary precipitation, aeration, secondary precipitation and sterilization. After being treated, the municipal sewage is generally used in places where reclaimed water is suitable for green space irrigation, toilet flushing and the like. The existing treatment process has the advantages of large treatment capacity, high speed and the like, but also has the problems of high energy consumption and difficult sludge treatment. In addition, nowadays, the environmental management is increasingly regarded as important, and how to combine sewage treatment with environmental management is also a problem to be considered in the development of sewage treatment technology.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a municipal sewage treatment method and a system, wherein the municipal sewage treatment method combines municipal sewage treatment with urban wetland construction, and by constructing a sewage treatment system mainly comprising an artificial wetland, the problem of high energy consumption in the existing municipal sewage treatment is solved, and simultaneously, the municipal sewage treatment and environmental management can be combined, so that the urban environment is improved on the basis of properly performing sewage treatment.
In order to solve the technical problems, the invention provides the following technical scheme:
a municipal sewage treatment method comprises the following steps:
s1) introducing the municipal sewage into a sewage filtering area through a municipal sewage pipe network to filter suspended matters in the municipal sewage to obtain filtered sewage; the sewage filtering area comprises a first separation net, a second separation net, a covering compaction net and a material for the thoroughly decomposed fertilizer, wherein the material for the thoroughly decomposed fertilizer is crushed grass and/or fallen leaves, and the material for the thoroughly decomposed fertilizer is stacked in a net cage formed by the first separation net, the second separation net and the covering compaction net;
s2) primarily treating the filtered sewage obtained in the step S1) by a multifunctional sewage treatment area to obtain primary purified sewage; the multifunctional sewage treatment area comprises a paper-making aquatic plant planting area and an ornamental aquatic plant planting area, and municipal sewage flows to the ornamental aquatic plant planting area through the paper-making aquatic plant planting area;
s3) carrying out pH value adjustment on the primary purified sewage obtained in the step S2) through a pH value adjusting area to obtain secondary purified sewage; the pH value adjusting area is in fluid communication connection with the ornamental aquatic plant planting area through a water conveying pipeline;
s4) treating the secondary purified sewage obtained in the step S3) by a pond sludge conversion area to obtain tertiary purified sewage; the pH value adjusting area is in fluid conduction connection with the pond sludge conversion area through a water conveying passage, and the pond sludge conversion area is used for converting raw soil into pond sludge rich in organic matters and nutrient substances;
s5) treating the third-stage purified sewage obtained in the step S4) by a sedimentation tank to obtain fourth-stage purified sewage, and storing the fourth-stage purified sewage in a water storage area for later use.
According to the municipal sewage treatment method, the sewage filtering area is internally provided with the guide rod with the spiral protrusion on the outer wall, two ends of the guide rod are respectively arranged outside the net cage, and the middle section of the guide rod is arranged in the net cage; two adjacent spiral protrusions are not connected.
According to the municipal sewage treatment method, the guide rod is a perforated pipe which is close to the end sealed by the pipe orifice at the water outlet end of the municipal sewage pipe network and is far away from the end not sealed by the pipe orifice at the water outlet end of the municipal sewage pipe network, and a middle hole of the perforated pipe is a conical hole with a cone angle of 2-7 degrees.
According to the municipal sewage treatment method, the water delivery passage is internally provided with the turbulence member.
The above municipal sewage treatment method, in step S5), discharging the discharged sludge produced in the sedimentation tank to the pond sludge converting zone.
According to the municipal sewage treatment method, the pond sludge conversion area is internally provided with the planting floating bed.
A system for sewage treatment by using the municipal sewage treatment method comprises:
the sewage filtering area is used for filtering suspended matters in the municipal sewage; the sewage filtering area comprises a first separation net, a second separation net, a covering compaction net and a material for the thoroughly decomposed fertilizer, wherein the material for the thoroughly decomposed fertilizer is crushed grass and/or fallen leaves, and the material for the thoroughly decomposed fertilizer is stacked in a net cage formed by the first separation net, the second separation net and the covering compaction net;
the multifunctional sewage treatment area is used for preliminarily absorbing nutrient-rich substances in the municipal sewage; the multifunctional sewage treatment area comprises a paper-making aquatic plant planting area and an ornamental aquatic plant planting area;
the pH value adjusting area is used for adjusting the pH value of the sewage treated by the multifunctional sewage treatment area;
the pond sludge conversion area is used for further absorbing and converting the nutrient-rich substances in the sewage after the pH value is adjusted and converting raw soil into pond sludge rich in organic matters and nutrient substances;
the sedimentation tank is used for carrying out sedimentation on the sewage treated by the pond sludge conversion area to remove residual heavy metal ions;
the reservoir is used for storing the sewage treated by the sedimentation tank;
municipal sewer network outlet end with sewage filtering area inlet end fluid switches on, sewage filtering area outlet end with papermaking aquatic plant species plants district fluid turn on connects, papermaking aquatic plant species plants district outlet end with ornamental aquatic plant species plants district inlet end fluid turn on connects, ornamental aquatic plant species plants district outlet end with the pH value regulatory region inlet end passes through conduit fluid turn on connects, pH value regulatory region outlet end with pond sludge conversion district inlet end water delivery passageway fluid turn on connects, pond sludge conversion district outlet end with sedimentation tank inlet end fluid turn on connects, the sedimentation tank with the cistern inlet end fluid turn on connects.
In the system, a spirally-raised guide rod is arranged on the outer wall of the sewage filtering area, the guide rod is a perforated pipe which is closed to the pipe orifice at the water outlet end of the municipal sewage pipe network and is not closed to the pipe orifice at the water outlet end of the municipal sewage pipe network, and a middle hole of the perforated pipe is a conical hole with a cone angle of 2-7 degrees; two ends of the diversion rod are respectively arranged at the outer side of the net cage, and the middle section of the diversion rod is arranged in the net cage; two adjacent spiral protrusions are not connected. The spiral protrusion can increase the gap between the side wall of the guide rod and the crushed grass or/and fallen leaves, and is favorable for municipal sewage to flow along the guide rod.
In the system, the water conveying pipeline and the water conveying passage are both provided with pH value monitors; the water outlet end of the water conveying pipeline is in fluid conduction connection with the water inlet end of the water pump, and the water outlet end of the water pump is in fluid conduction connection with the water inlet end of the pH value adjusting area.
In the system, in the pH value adjusting area, the water outlet end of the water pump is in fluid conduction connection with the water inlet end of the first water conduit, the water outlet end of the first water conduit is in fluid conduction connection with the water inlet end of the split-flow mixing tube group, the water outlet end of the split-flow mixing tube group is in fluid conduction connection with the water inlet end of the second water conduit, the water outlet end of the second water conduit is in fluid conduction connection with the water inlet end of the standing area, and the water outlet end of the standing area is in fluid conduction connection with the water inlet end of the water delivery passage; a dosing device is arranged on the first water conduit; the first water conduit and the second water conduit both have an inner diameter D1A turbulent flow structure is arranged on the inner wall of the water flow device and comprises a first vertical plate, a second vertical plate and a third vertical plate, the length direction of the second vertical plate is parallel to the overall flow direction of water flow, the included angle degree between the length direction of the first vertical plate and the length direction of the second vertical plate is 5-40 degrees, the included angle degree between the length direction of the third vertical plate and the length direction of the second vertical plate is 5-40 degrees, at least the tail end of the second vertical plate is arranged between the first vertical plate and the third vertical plate, and a gap is arranged between the second vertical plate and the first vertical plate and the third vertical plate respectively; the shunting and mixing pipe group comprises n inner diameters D2The inner wall of the mixing pipe is provided with a flow distribution mixing pipe of a spoiler, and n is a natural number more than or equal to 3; d1＝nD2。
The technical scheme of the invention achieves the following beneficial technical effects:
1. the invention utilizes the multifunctional sewage treatment area to remove the sewage in the municipal sewage, filters and settles the municipal sewage, and simultaneously utilizes the sediments as the fertilizer of the aquatic plants, thereby improving the environment and purifying the sewage. And the pond sludge conversion area can be used for converting some soil with raw soil or seriously reduced fertility into pond sludge rich in organic matters and nutrient substances, and the pond sludge is used for organic planting, so that the nutrient substances in the eutrophic municipal sewage can be converted into the pond sludge, and organic fertilizers for agricultural production can be produced, thereby realizing the double combination of sewage treatment and waste utilization.
2. The invention can also utilize the aquatic plants in the multifunctional sewage treatment area to reduce the concentration of heavy metal ions in the municipal sewage, namely, the aquatic plants which can enrich the heavy metal ions are planted to realize the aim of reducing the concentration of the heavy metal ions in the municipal sewage.
3. The multifunctional sewage treatment area and the pond sludge conversion area can construct an urban wetland, improve local climatic environment and realize the coordination of sewage treatment and natural ecology.
Drawings
FIG. 1 is a process flow diagram of a municipal wastewater treatment process according to the invention;
FIG. 2 is a schematic view of the structure of the sewage filtering section according to the present invention;
FIG. 3 is a schematic structural view of a perforated pipe according to the present invention;
FIG. 4 is a schematic view of the assembly of the first conduit and the spoiler structure according to the present invention;
FIG. 5 is a perspective view of the assembly of the first conduit and the spoiler structure according to the present invention.
In the figure, 1-municipal sewage pipe network; 2-a sewage filtering area; 3-a paper making aquatic plant growing area; 4-ornamental aquatic plant growing area; 5-a water conveying pipeline; 6, a water pump; 7-a first water conduit; 8-a split-flow mixing pipe; 9-a second water conduit; 10-pond sludge conversion zone; 11-a sedimentation tank; 12-a water reservoir; 13-a first separating mesh; 14-a second separator web; 15-perforated pipe; 16-chopped grass and/or fallen leaves; 17-eyelet holes; 18-a second riser; 19-a first riser; 20-a third vertical plate; 21 a standing area; 22-water delivery path.
Detailed Description
Social development should be coordinated with nature, which is the basis of social sustainable development. And as urban population increases rapidly, municipal sewage discharge amount also increases rapidly. The existing municipal sewage treatment method comprises the steps of filtering, primary sedimentation, aeration, secondary sedimentation, killing and disinfection, and the water obtained after treatment is used for irrigating urban green plants and the like. According to the characteristics of the municipal sewage, the municipal sewage can be treated by a treatment method taking the natural environment as a main body, so that the treatment method is beneficial to improving the local natural environment and saving energy.
The municipal sewage is treated by constructing a system taking a natural ecological structure as a main body, the sewage treatment is combined with the natural ecological structure, and the natural environment is reformed while the municipal sewage is treated, so that the reformed natural environment can improve the local environment and can treat the municipal sewage. Wherein, the system comprises a sewage filtering area 2, a multifunctional sewage treatment area, a pH value adjusting area, a pond sludge conversion area 10, a sedimentation tank 11 and a reservoir 12. The sewage filtering area 2 is used for filtering suspended matters in municipal sewage, and the sewage filtering area 2 comprises a first separation net 13, a second separation net 14, a covering compaction net and decomposed fertilizer materials, wherein the decomposed fertilizer materials are crushed grass and/or fallen leaves, and the decomposed fertilizer materials are stacked in a net cage formed by the first separation net 13, the second separation net 14 and the covering compaction net; the multifunctional sewage treatment area is mainly used for primarily absorbing nutrient-rich substances in municipal sewage and comprises a papermaking aquatic plant planting area 3 and an ornamental aquatic plant planting area 4; the pH value adjusting area is used for adjusting the pH value of the sewage treated by the multifunctional sewage treatment area; the pond sludge conversion area 10 is used for further absorbing and converting the nutrient-rich substances in the sewage after the pH value is adjusted and converting raw soil into pond sludge rich in organic matters and nutrient substances; the sedimentation tank 11 is used for settling the sewage treated by the pond sludge conversion zone 10 to remove the residual heavy metal ions; the reservoir 12 is used for storing the sewage treated by the sedimentation tank 11; municipal sewer network 1 delivery end with 2 delivery end fluids in sewage filtering area conduct, 2 delivery ends in sewage filtering area with 3 fluid conduction connection in the aquatic plant planting area for papermaking, 3 delivery ends in the aquatic plant planting area for papermaking with 4 delivery end fluids conduction connection in the aquatic plant planting area for appreciation, 4 delivery ends in the aquatic plant planting area for appreciation with the pH value regulatory region delivery end passes through 5 fluid conduction connections in the conduit, pH value regulatory region delivery end with pond sludge conversion district 10 is intake and is held water pipeline 22 fluid conduction connection, pond sludge conversion district 10 delivery end with 11 delivery end fluids conduction connection in sedimentation tank, sedimentation tank 11 with 12 is intake and is held fluid conduction connection. The water outlet end of the water conveying pipeline 5 is in fluid conduction connection with the water inlet end of the water pump 6, the water outlet end of the water pump 6 is in fluid conduction connection with the water inlet end of the pH value adjusting area, and the water conveying pipeline 5 and the water conveying passage 22 are both provided with pH value monitors.
In this embodiment, in order to increase the water passing capacity of the filtering device composed of the net cage, the grass clippings and the fallen leaves in the sewage filtering area 2, that is, increase the sewage passing rate of the filtering device, a spiral raised guide rod is arranged on the outer wall of the sewage filtering area 2, the guide rod is an eyelet pipe 15 which is closed at the end close to the pipe orifice at the water outlet end of the municipal sewage pipe network 1 and is not closed at the end far from the pipe orifice at the water outlet end of the municipal sewage pipe network 1, and the hole in the eyelet pipe 15 is a tapered hole with a taper angle of 5 °; two ends of the diversion rod are respectively arranged at the outer side of the net cage, and the middle section of the diversion rod is arranged in the net cage; two adjacent spiral protrusions are not connected. Wherein, the helical bulge can make the part of the partial broken grass and the outer wall of the flower hole pipe 15 generate a gap, which is beneficial for municipal sewage to flow into the flower hole pipe 15 through the flower hole 17 on the flower hole pipe 15 and then flow to the multifunctional sewage treatment area through the flower hole pipe 15, and the arrangement of the conical hole can make the municipal sewage flow into the flower hole pipe 15 through the flower hole 17 of the flower hole pipe 15 near the end of the flower hole pipe 15 and flow to the multifunctional sewage treatment area. The arrangement of the flower eye pipes 15 greatly improves the sewage passing capacity, ensures that the untreated municipal sewage is filtered to remove impurities, and can prevent the crushed grass from being compacted and the water passing capacity of the filtering device is too small. Set up evenly on the first separation net 13 unit area and set up 20 ~ 50 flower eye pipe 15 just when the pore diameter of flower eye pipe 15 is the bell mouth aperture of 2cm, by first separation net 13, second separation net 14 the compaction covers the net, thoroughly decomposed fertile material with filter equipment that flower eye pipe 15 constitutes filters municipal sewage, can filter the suspended solid that reaches 94.7% in the municipal sewage, and the through-flow of unit area is not setting up tens times of when flower eye pipe 15, even hundreds of times under the same operating mode condition simultaneously.
In the pH value adjusting area, the water outlet end of the water pump 6 is in fluid conduction connection with the water inlet end of the first water conduit 7, the water outlet end of the first water conduit 7 is in fluid conduction with the water inlet ends of the diversion mixing pipes 8, the water outlet ends of the diversion mixing pipes 8 are in fluid conduction connection with the water inlet end of the second water conduit 9, the water outlet end of the second water conduit 9 is in fluid conduction connection with the water inlet end of the standing area 21, the water outlet end of the standing area 21 is in fluid conduction connection with the water inlet end of the water delivery passage 22, and a turbulence member is arranged in the water delivery passage 22; a dosing device is arranged on the first water conduit 7; the first water conduit 7 and the second water conduit 9 both have an inner diameter D1A turbulent flow structure is arranged on the inner wall of the water flow device and comprises a first vertical plate 19, a second vertical plate 18 and a third vertical plate 20, the length direction of the second vertical plate 18 is parallel to the overall flow direction of water flow, the included angle degree between the length direction of the first vertical plate 19 and the length direction of the second vertical plate 18 is 27 degrees, the included angle degree between the length direction of the third vertical plate 20 and the length direction of the second vertical plate 18 is 27 degrees, at least the tail end of the second vertical plate 18 is arranged between the first vertical plate 19 and the third vertical plate 20, and gaps are respectively arranged between the second vertical plate 18 and the first vertical plate 19 and the third vertical plate 20; the flow distribution mixing pipe 8 groups comprise 3 inner diameters D2And the inner wall is provided with a flow distribution mixing pipe 8 of a spoiler; d1＝3D2. The setting of vortex structure is in order right first leading water pipe 7 with promote the mixing of medicament and municipal sewage under the less condition of the traffic influence in the second leading water pipe 9, be provided with through the test the traffic under the vortex structure condition only than not establishing under with the operating mode the traffic under the vortex structure condition is 1 ~ 3% less, nevertheless is provided with medicament and municipal sewage mixing degree under the vortex structure condition is better than not establishing far away medicament and municipal sewage mixing degree under the vortex structure condition.
The multifunctional sewage treatment area and the pond sludge conversion area 10 can be constructed according to the existing terrain, and can also be constructed according to the existing city plan, and specifically, the multifunctional sewage treatment area and the pond sludge conversion area 10 are constructed by using the water surface and the area adjacent to the water surface. The aquatic plant planting area 3 for papermaking is constructed in the area adjacent to the water surface, and aquatic plants which can be used as papermaking raw materials, such as reed or cattail, are planted in the aquatic plant planting area 3 for papermaking, and the aquatic plant planting area 3 for papermaking with a corresponding area can be constructed according to the processing capacity required by the system. Then, the ornamental aquatic plant growing area 4 is constructed, ornamental aquatic plants for beautifying the environment, such as lotus, sedum rosea, loosestrife and the like, are grown in the ornamental aquatic plant growing area 4, and meanwhile, some aquatic animals, such as freshwater fish, can be cultured in the ornamental aquatic plant growing area 4. The existing water surface is used for the pond sludge conversion area 10, so that the newly occupied area for constructing the pond sludge conversion area 10 can be reduced, and meanwhile, an ecosystem in the pond sludge conversion area 10 can be constructed by using an existing water surface ecosystem, such as algae for providing food for fishes and shrimps, aquatic plants planted in pond sludge, and fishes living in different water layers.
The system is used for treating municipal sewage, and the specific method comprises the following steps:
s1) introducing the municipal sewage into a sewage filtering area 2 through a municipal sewage pipe network 1 to filter suspended matters in the municipal sewage to obtain filtered sewage; the sewage filtering area 2 comprises a first separation net 13, a second separation net 14, a covering compaction net and decomposed fertilizer materials, wherein the decomposed fertilizer materials are crushed grass and/or fallen leaves, and the decomposed fertilizer materials are stacked in a net cage formed by the first separation net 13, the second separation net 14 and the covering compaction net;
s2) primarily treating the filtered sewage obtained in the step S1) by a multifunctional sewage treatment area to obtain primary purified sewage; the multifunctional sewage treatment area comprises a paper-making aquatic plant planting area 3 and an ornamental aquatic plant planting area 4, and municipal sewage flows to the ornamental aquatic plant planting area 4 through the paper-making aquatic plant planting area 3;
s3) carrying out pH value adjustment on the primary purified sewage obtained in the step S2) through a pH value adjusting area to obtain secondary purified sewage; the pH value adjusting area is in fluid communication connection with the ornamental aquatic plant growing area 4 through a water conveying pipeline 5;
s4) treating the secondary purified sewage obtained from the step S3) by the pond sludge converting zone 10 to obtain a tertiary purified sewage; the pH value adjusting zone is in fluid communication with the pond sludge conversion zone 10 through a water delivery passage 22, and the pond sludge conversion zone 10 is used for converting raw soil into pond sludge rich in organic matters and nutrients;
s5) treating the third-stage purified sewage obtained in the step S4) by a sedimentation tank 11 to obtain fourth-stage purified sewage, and storing the fourth-stage purified sewage in a water storage area for later use.
As is well known, although municipal sewage is simple in components and easy to treat compared with industrial sewage, a certain amount of oil stains and other types of particles exist in the municipal sewage, and when the oil stains stay in a water body for a long time, along with the increase of the oil stains, the oil stains can form an oil film on the surface of the water body, so that the gas exchange between a local water body and the atmosphere is influenced, and the water quality of the water body is difficult to improve. Therefore, before municipal sewage is treated by constructing a multifunctional treatment area, the crushed grass or/and the fallen leaves 16 are used as a filtering main body in the sewage filtering area 2 to absorb and filter oil stains and other types of particles in the municipal sewage, and the crushed grass or/and the fallen leaves 16 are taken out together and transported to a decomposed fertilizer preparation site to be decomposed into fertilizer along with the accumulation of the oil stains and other types of particles to a certain degree. The prepared decomposed fertilizer can be used in farms or other decomposed fertilizer using environments, so that the treatment pressure of oil stains in municipal sewage on a treatment link is reduced, a new purpose is provided for grass chippings obtained after trimming urban green lands, organic fertilizers are provided for agricultural production or other fertilizer using environments, the purpose of coordinating sewage treatment with natural environments is achieved, and the material circulation of the nature is promoted.
And along with the promotion of urbanization, small-size cities and towns can be more and more, the sewage total amount that they produced also can increase thereupon, large-scale sewage treatment plant cost is higher, small-size sewage treatment plant scale benefit is relatively poor, and municipal sewage treatment combines together with natural environment or the environment transformation project of artifical structure, not only can utilize natural environment to deposit, disinfect and disinfect municipal sewage, can also utilize the evaporation of water in the sewage treatment process to improve local environment, utilize the pond mud that produces and thoughtlessly there is a large amount of debris litter preparation thoroughly decomposed fertilizer or base fertilizer to carry out organic agriculture simultaneously, thereby can make small-size cities and towns to green cities and towns conversion.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are possible which remain within the scope of the appended claims.
Claims (10)
1. A municipal sewage treatment method is characterized by comprising the following steps:
s1) introducing the municipal sewage into a sewage filtering area (2) through a municipal sewage pipe network (1) to filter suspended matters in the municipal sewage to obtain filtered sewage; the sewage filtering area (2) comprises a first separation net (13), a second separation net (14), a covering compaction net and decomposed fertilizer materials, wherein the decomposed fertilizer materials are crushed grass and/or fallen leaves (16), and the decomposed fertilizer materials are stacked in a net cage formed by the first separation net (13), the second separation net (14) and the covering compaction net;
s2) primarily treating the filtered sewage obtained in the step S1) by a multifunctional sewage treatment area to obtain primary purified sewage; the multifunctional sewage treatment area comprises a paper-making aquatic plant planting area (3) and an ornamental aquatic plant planting area (4), and municipal sewage flows to the ornamental aquatic plant planting area (4) through the paper-making aquatic plant planting area (3);
s3) carrying out pH value adjustment on the primary purified sewage obtained in the step S2) through a pH value adjusting area to obtain secondary purified sewage; the pH value adjusting area is in fluid communication connection with the ornamental aquatic plant planting area (4) through a water conveying pipeline (5);
s4) treating the secondary purified sewage obtained in the step S3) by a pond sludge conversion area (10) to obtain tertiary purified sewage; the pH value adjusting area is in fluid communication connection with the pond sludge conversion area (10) through a water conveying passage (22), and the pond sludge conversion area (10) is used for converting raw soil into pond sludge rich in organic matters and nutrient substances;
s5) treating the third-stage purified sewage obtained in the step S4) by a sedimentation tank (11) to obtain fourth-stage purified sewage, and storing the fourth-stage purified sewage in a water storage area for later use.
2. The municipal sewage treatment method according to claim 1, wherein a guide rod having a spiral protrusion on an outer wall is disposed in the sewage filtering area (2), both ends of the guide rod are disposed outside the cage respectively and a middle section of the guide rod is disposed in the cage; two adjacent spiral protrusions are not connected.
3. The municipal sewage treatment method according to claim 2, wherein the diversion rod is an eyelet pipe (15) that is closed end near the outlet end pipe orifice of the municipal sewage pipe network (1) and is not closed end far away from the outlet end pipe orifice of the municipal sewage pipe network (1), and the central hole of the eyelet pipe (15) is a conical hole with a cone angle of 2-7 °.
4. The municipal sewage treatment method according to claim 1, wherein a flow disturbing member is provided in the water feed passage (22).
5. The municipal sewage treatment method according to any one of claims 1 to 4, wherein in step S5), the discharged sludge produced in the sedimentation tank (11) is discharged to the pond sludge converting zone (10).
6. The municipal sewage treatment method according to claim 5, wherein a floating planting bed is provided in the pond sludge conversion zone (10).
7. A system for treating sewage by using the municipal sewage treatment method according to any one of claims 1 to 6, comprising:
the sewage filtering area (2) is used for filtering suspended matters in the municipal sewage; the sewage filtering area (2) comprises a first separation net (13), a second separation net (14), a covering compaction net and decomposed fertilizer materials, wherein the decomposed fertilizer materials are crushed grass and/or fallen leaves (16), and the decomposed fertilizer materials are stacked in a net cage formed by the first separation net (13), the second separation net (14) and the covering compaction net;
the multifunctional sewage treatment area is used for preliminarily absorbing nutrient-rich substances in the municipal sewage; the multifunctional sewage treatment area comprises a paper-making aquatic plant planting area (3) and an ornamental aquatic plant planting area (4);
the pH value adjusting area is used for adjusting the pH value of the sewage treated by the multifunctional sewage treatment area;
the pond sludge conversion area (10) is used for further absorbing and converting the nutrient-rich substances of the sewage after the pH value adjustment and converting raw soil into pond sludge rich in organic matters and nutrient substances;
the sedimentation tank (11) is used for carrying out sedimentation on the sewage treated by the pond sludge conversion zone (10) to remove residual heavy metal ions;
a reservoir (12) for storing the sewage treated by the sedimentation tank (11);
municipal sewer network (1) water outlet end with sewage filtering area (2) intake end fluid switches on, sewage filtering area (2) water outlet end with papermaking aquatic plant species plants district (3) fluid switch on connection, papermaking aquatic plant species plants district (3) water outlet end with ornamental aquatic plant species plants district (4) intake end fluid switch on connection, ornamental aquatic plant species plants district (4) water outlet end with the pH value regulatory region is intake the end and is passed through hydraulic pipeline (5) fluid switch on connection, the pH value regulatory region water outlet end with pond sludge conversion district (10) is intake end water delivery way (22) fluid switch on connection, pond sludge conversion district (10) water outlet end with sedimentation tank (11) is intake and is held fluid switch on connection, sedimentation tank (11) with cistern (12) is intake and is held fluid switch on connection.
8. The system according to claim 7, wherein a guide rod with a spiral protrusion arranged on the outer wall is arranged in the sewage filtering area (2), the guide rod is a perforated pipe (15) which is closed near the outlet end pipe orifice of the municipal sewage pipe network (1) and is not closed far away from the outlet end pipe orifice of the municipal sewage pipe network (1), and the central hole of the perforated pipe (15) is a conical hole with a cone angle of 2-7 degrees; two ends of the diversion rod are respectively arranged at the outer side of the net cage, and the middle section of the diversion rod is arranged in the net cage; two adjacent spiral protrusions are not connected.
9. The system according to claim 8, wherein the water conveying pipeline (5) and the water conveying passage (22) are provided with pH value monitors; the water outlet end of the water conveying pipeline (5) is in fluid conduction connection with the water inlet end of the water pump (6), and the water outlet end of the water pump (6) is in fluid conduction connection with the water inlet end of the pH value adjusting area.
10. The system of claim 9, wherein in the pH adjustment zone, the water pump (6) outlet is in fluid communication with the first water conduit (7) inlet, the first water conduit (7) outlet is in fluid communication with the split mixing tube set inlet, the split mixing tube set outlet is in fluid communication with the second water conduit (9) inlet, the second water conduit (9) outlet is in fluid communication with the rest zone (21) inlet, and the rest zone (21) outlet is in fluid communication with the water delivery pathway (22) inlet; a dosing device is arranged on the first water conduit (7); the first water conduit (7) and the second water conduit (9) both have an inner diameter D1And be equipped with the vortex structure on the inner wall, the vortex structure includes first riser (19), second riser (18) and third riser (20), second riser (18) length direction is parallel with the whole flow direction of rivers, first riser (19) length direction with contained angle degree between second riser (18) length direction is 5 ~ 40, third riser (20) length direction with contained angle degree between second riser (18) length direction is 5 ~ 40, second riser (18) tail end setting at least is in first riser (19) with between third riser (20) just second riser (18) respectively with first riser (19) between the length direction) A gap is arranged between the third vertical plate (20); the shunting and mixing pipe group comprises n inner diameters D2A flow-dividing mixing pipe (8) of a spoiler is arranged on the inner wall, and n is a natural number more than or equal to 3; d1＝nD2。
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| CN202110208088.6A CN113003861A (en) | 2021-02-24 | 2021-02-24 | Municipal sewage treatment method and system |
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| CN202110208088.6A CN113003861A (en) | 2021-02-24 | 2021-02-24 | Municipal sewage treatment method and system |
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