CN108083435B - Buried phosphate fertilizer on-site recycling device and sewage treatment method - Google Patents
Buried phosphate fertilizer on-site recycling device and sewage treatment method Download PDFInfo
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Abstract
The invention discloses a buried phosphate fertilizer in-situ recycling device and a sewage treatment method, wherein the in-situ recycling device adopts an integrated structure, organically combines an anaerobic treatment area, a three-phase separation device, an aerobic treatment area, an inclined plate sedimentation area and a sludge decomposition treatment area together, and is buried under the ground, so that the buried phosphate fertilizer in-situ recycling device has the advantages of enhanced phosphorus removal, environmental protection, phosphorus recycling and the like; the sewage treatment method can realize the removal of total nitrogen and organic matters, the anaerobic treatment and the aerobic treatment are connected in series to realize the purposes of anaerobic phosphorus release and aerobic phosphorus absorption, the total nitrogen and the organic matters are effectively removed under the degradation treatment effect of activated sludge, and meanwhile, the composting treatment is carried out on the residual sludge, so that the recycling, harmlessness and reclamation of phosphorus pollution of the domestic sewage in new rural areas can be realized.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a buried phosphate fertilizer on-site recycling device and a sewage treatment method.
Background
In daily life, domestic sewage such as cheap phosphorus-containing washing powder and the like enters rivers, lakes and the like through percolation or direct disordered discharge and the like due to the lack of a perfect sewage treatment system, and the discharge of a large amount of phosphorus causes the problems of water body pollution, eutrophication and the like. Therefore, the phosphorus-containing domestic sewage treatment becomes an urgent research hotspot.
At present, the method mainly focuses on removing phosphorus in sewage at home and abroad, and the recycling of the phosphorus is not fully paid attention. In terms of phosphorus removal, biological processes, ecological processes and biological-ecological combined processes are mainly adopted in the current engineering, and the specific methods comprise A/O, biological filters, septic tanks, stabilization ponds, constructed wetlands, soil infiltration technologies and the like. From the viewpoint of operational effects, each process has more or less problems. For example, the stabilization pond treatment technology is to remove pollutants by using the functions of microbial degradation, sedimentation, conversion, interception and the like, but the total phosphorus content in the effluent is high, the effluent does not reach the standard, and the stabilization pond treatment technology has the defects of large floor area, odor emission, unstable treatment effect and the like. Although the artificial wetland treatment technology can fully exert the production potential of resources, the dephosphorization efficiency is low. In the operation of the mature anaerobic-aerobic biological treatment process-enhanced phosphorus removal process, although the phosphorus removal efficiency is high, industrial wastewater is inevitably mixed in the urban domestic sewage, so that heavy metals, other toxic and harmful substances and phosphorus coexist in the residual sludge and are difficult to recycle, and finally the sludge is subjected to concentration, digestion and dehydration to be used as solid waste to be buried. Therefore, phosphorus as a scarce resource is wasted, and if the phosphorus permeates underground, the phosphorus can cause profound influence on the quality of underground water, and the phosphorus is easy to cause eutrophication of water bodies when being discharged into rivers and lakes after being dissolved and drenched by rainwater. In fact, the domestic sewage of the new rural community is obviously different from the domestic sewage of the city, the water quality is not polluted by industrial enterprises, heavy metals and other toxic and harmful substances are not contained, and organic matter components only contain COD (chemical oxygen demand), nitrogen, phosphorus and the like. Therefore, the phosphorus recovery in the rural domestic sewage is not interfered by adverse factors. Thus, the domestic sewage is made into decomposed fertilizer after the residual sludge after biological treatment is piled with plant substances such as stalks, green manure, weeds and the like. Compared with the phosphorus recovery of urban sewage, the new rural community is closer to the farmland, the phosphorus recovery of domestic sewage is more advantageous in feasibility, the phosphorus recovery can be applied on site or in a short distance, and the phosphorus recovery method has the advantages of saving transportation cost, being convenient to operate and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing an on-site recycling device and a sewage treatment method for buried phosphate fertilizer, which can solve the problems of low total phosphorus removal rate and low recycling rate in the existing new rural phosphorus-containing sewage treatment technology and realize the recycling of phosphorus-containing sewage.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows: an underground phosphate fertilizer on-site recycling device comprises a sewage treatment tank, an anaerobic treatment area, an aerobic treatment area, an inclined plate sedimentation area and a sludge decomposition treatment area which are arranged in the sewage treatment tank in a segmented mode and are sequentially communicated, wherein a three-phase separation device for realizing gas-liquid-solid three-phase separation is arranged between the anaerobic treatment area and the aerobic treatment area; the upper part of the anaerobic treatment area is provided with a sewage inlet pipe, and the bottom of the anaerobic treatment area is provided with a plurality of stirrers; the aerobic treatment zone is internally provided with a bunchy filler, an aeration device and a stirrer, the aeration device and the stirrer are positioned at the bottom of the aerobic treatment zone, and the bunchy filler is positioned above the aeration device and the stirrer; the inclined plate sedimentation area is internally provided with sedimentation baffles, a sludge collecting hopper, a water outlet pipe, a phosphorus-containing sludge return pipe and a phosphorus-containing sludge recovery pipe, the sedimentation baffles are positioned above the sludge collecting hopper, one end of the water outlet pipe is connected with a water outlet device above the inclined plate sedimentation area, and the other end of the water outlet pipe extends out of the sewage treatment tank; one end of the phosphorus-containing sludge return pipe is connected with the bottom of the sludge collecting hopper, and the other end of the phosphorus-containing sludge return pipe extends to the aerobic treatment area; one end of the phosphorus-containing sludge recovery pipe is connected with the bottom of the sludge collecting hopper, and the other end of the phosphorus-containing sludge recovery pipe extends to the sludge decomposition treatment area; and a feeding observation hole is formed in the top of the sludge decomposition treatment area.
According to the buried phosphate fertilizer on-site recycling device, an anaerobic treatment area and an aerobic treatment area are separated by a first partition plate, an aerobic treatment area and an inclined plate sedimentation area are separated by a second partition plate, and the inclined plate sedimentation area and a sewage decomposition treatment area are separated by a third partition plate; the three-phase separation device is positioned on the first partition plate, the second partition plate is provided with a first effluent weir which leads the sewage in the aerobic treatment zone to flow to the inclined plate sedimentation zone, and the third partition plate is provided with a second effluent weir which leads the water in the inclined plate sedimentation zone to flow out of the sewage treatment tank.
The buried phosphate fertilizer in-situ recycling device comprises a first lower partition plate, a first baffle plate and a second baffle plate, wherein the first lower partition plate is arranged on the first partition plate, a certain length of hole is reserved between the upper end and the lower end of the first lower partition plate and the first partition plate, the first baffle plate is obliquely arranged at the lower end of the first partition plate, the second baffle plate is obliquely arranged at the joint of the first partition plate and the lower wall of a sewage treatment tank, an air outlet seam is arranged between the first lower partition plate and the first baffle plate, a water outlet seam is arranged between the first baffle plate and the second baffle plate, and a sludge backflow seam is arranged between the first lower partition plate and the second baffle plate.
According to the buried phosphate fertilizer on-site recycling device, included angles among the first lower baffle plate, the first baffle plate and the second baffle plate are n, and the value range of n is 30-40 degrees.
The invention relates to an on-site recycling device for buried phosphate fertilizers, which comprises an air compressor, an aeration pipe and a plurality of aeration heads, wherein one end of the aeration pipe is connected with the air compressor, the other end of the aeration pipe extends to the bottom of an aerobic treatment area, the plurality of aeration heads are arranged on the aeration pipe at the bottom of the aerobic treatment area, and the aeration heads are positioned below a stirrer.
According to the buried phosphate fertilizer on-site recycling device, the included angle between the precipitation baffle plate and the ground is beta, wherein the value range of beta is 45-60 degrees.
The buried phosphate fertilizer on-site recycling device has the volume ratio of the anaerobic treatment area to the aerobic treatment area being 1: 2.
The buried phosphate fertilizer on-site recycling device comprises an anaerobic treatment area, a three-phase separation device, an aerobic treatment area, an inclined plate sedimentation area and a sludge decomposition treatment area which are buried under the ground.
The invention also discloses a sewage treatment method based on the buried phosphate fertilizer on-site recycling device, which comprises the following steps: s01), anaerobic treatment: introducing wastewater with a chemical oxygen demand of 50-400 mg/L, a biochemical oxygen demand of 25-100 mg/L, a total nitrogen concentration of 5-10 mg/L and a pH value of 7.2-7.5 into an anaerobic treatment area from an upper sewage inlet pipe of the anaerobic treatment area at a speed of 0.5-0.8 m/h, carrying out anaerobic reaction in the anaerobic treatment area, continuously stirring and mixing through a stirrer, fully releasing phosphorus by using anaerobic bacteria, degrading and absorbing organic matters in the wastewater, converting the organic matters into PHAs and other substances, wherein the anaerobic treatment time is 8-12 h, introducing the anaerobically treated wastewater into a three-phase separation device, and carrying out gas, liquid and solid separation in the three-phase separation device;
s02), aerobic treatment: the separated sewage enters an aerobic treatment zone through a water outlet seam of a three-phase separation device, a biological film formed by a bundle-shaped filler is adopted in the aerobic treatment zone to absorb and degrade pollutants, namely, the hydraulic retention time is controlled to be 4-6 h, the suspended solid concentration of the mixed liquid is 400-500 mg/L, and the dissolved oxygen is 3.0-6.0 mg/L, so that aerobic biological treatment is carried out, phosphorus and the rest of organic matters which are difficult to degrade in the sewage are removed, and the sewage treated by the aerobic treatment zone enters an inclined plate precipitation zone through a first water outlet weir;
s03), inclined plate sedimentation treatment: the wastewater treated by the aerobic treatment zone enters an inclined plate precipitation zone through a first effluent weir, solid-liquid separation is completed in the inclined plate precipitation zone by using a shallow pool precipitation theory, namely, dissolved oxygen is controlled to be 0.5-1.5 mg/L, total phosphorus is controlled to be 0.5-1.0 mg/L, the precipitation time is 3-5 h, solid substances are precipitated into a sludge collecting hopper under the action of gravity, supernatant liquid gradually rises, and after being collected by a second effluent weir, reclaimed water is discharged from a water outlet pipe for recycling, part of sludge in the sludge collecting hopper flows back to the aerobic treatment zone through a phosphorus-containing sludge return pipe, and the rest sludge enters a sludge rotten treatment zone through a phosphorus-containing sludge recycling pipe;
s04), sludge decomposition treatment: after the excess sludge enters the sludge decomposition treatment area through the phosphorus-containing sludge recovery pipe, composting treatment is carried out on the excess sludge and the substances such as straws, wheat husks and the like added through the feeding observation hole, resource utilization of the excess sludge is realized, and part of phosphate fertilizer is recovered.
The invention has the beneficial effects that: the device adopts an integrated structure, organically combines the anaerobic treatment zone, the three-phase separation device, the aerobic treatment zone, the inclined plate sedimentation zone and the sludge decomposition treatment zone together, and the integrated device is buried under the ground, so that the device has the advantages of enhanced phosphorus removal, environmental protection, phosphorus recycling and the like; the sewage treatment method can realize the removal of total nitrogen and organic matters, the anaerobic treatment and the aerobic treatment are connected in series to realize the purposes of anaerobic phosphorus release and aerobic phosphorus absorption, the effective removal of the total nitrogen and the organic matters is realized under the degradation treatment effect of activated sludge, and meanwhile, the composting treatment is carried out on the residual sludge, so that the recycling, harmless treatment and resource treatment of phosphorus pollution of the domestic sewage in new rural areas can be realized; the effluent treated by the device can be recycled and used for flushing toilets, greening irrigation and the like in families; the sewage treatment method of the invention utilizes the inclined plate sedimentation effect, shortens the sedimentation time of the particle sedimentation distance and improves the sewage treatment efficiency while increasing the sedimentation area of the sedimentation tank.
Drawings
FIG. 1 is a schematic structural diagram of an on-site buried phosphate fertilizer recycling device;
FIG. 2 is an enlarged view of the three-phase separation apparatus;
in the figure: 1. a pressure pump; 2. a sewage inlet pipe; 3-1, the left wall of the tank; 3-2, the lower wall of the tank; 3-3, the right wall of the tank; 3-4, the upper wall of the pool; 4. an anaerobic treatment zone; 5. a stirrer; 6. gas outlet seam; 7. water outlet seams; 8. sludge backflow seam; 9. a first lower partition plate; 10. a three-phase separation device; 11-1, a first baffle; 11-2 and a second baffle; 12. a stirrer; 13. an aeration head; 14. an aerobic treatment zone; 15. a bundled filler; 16. an aeration pipe; 17. a phosphorus-containing sludge return pipe; 18. a sludge reflux pump; 19. a mud collection hopper; 20. a phosphorus-containing sludge recovery pipe; 21. a sludge decomposition treatment area; 22. a third partition plate; 23. a feeding observation hole; 24. a water outlet pipe; 25. discharging the water pump; 26. a second effluent weir; 27. a sloping plate sedimentation zone; 28. a sludge settling baffle; 29. a first effluent weir; 30. an air compressor; 31. a second separator; 32. a first separator.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Example 1
As shown in figure 1, the buried phosphate fertilizer on-site recycling device comprises an anaerobic treatment area 4, a three-phase separation device 10, an aerobic treatment area 14, an inclined plate sedimentation area 27 and a sludge decomposition treatment area 21; a first partition plate 32 is arranged between the anaerobic treatment zone 4 and the aerobic treatment zone 14, a second partition plate 31 is arranged between the aerobic treatment zone 14 and the inclined plate sedimentation zone 27, and a third partition plate 22 is arranged between the inclined plate sedimentation zone 27 and the sludge decomposition treatment zone 21. The left wall 3-1 of the tank, the lower wall 3-2 of the tank and the upper wall 3-3 of the tank form a sewage treatment tank, and the anaerobic treatment zone, the aerobic treatment zone, the inclined plate sedimentation zone and the sludge decomposition treatment zone are arranged in the sewage treatment tank in sections and are communicated in sequence.
The anaerobic treatment area 4 consists of a pressure pump 1, a sewage inlet pipe 2, a left pool wall 3-1, a lower pool wall 3-2, an upper pool wall 3-4, a first partition plate 32 and a plurality of stirrers 5; the tank body of the anaerobic treatment zone is surrounded by a tank left wall 3-1, a tank lower wall 3-2, a tank upper wall 3-4, a first lower partition plate 9 and a first partition plate 32, the sewage inlet pipe 2 is arranged on the upper part of the anaerobic treatment zone 4, the pressure pump 1 is arranged on the ground corresponding to the tank left wall 3-1 and communicated with the sewage inlet pipe 2, and the plurality of stirrers 5 are uniformly distributed at the bottom of the anaerobic treatment zone 4.
As shown in fig. 1 and 2, the three-phase separator 10 is disposed at the bottom of the first partition 32 and serves as a water outlet of the anaerobic treatment zone 4. The three-phase separation device comprises a first lower partition plate 9, a first baffle plate 11-1 and a second baffle plate 11-2, wherein the first lower partition plate 9 is arranged on a first partition plate 32, gaps with certain lengths are reserved between the upper end and the lower end of the first lower partition plate 9 and the first partition plate 32, the first baffle plate 11-1 is obliquely arranged at the lower end of the first partition plate 32, the second baffle plate 11-2 is obliquely arranged at the joint of the first partition plate 32 and the lower wall 3-2 of the sewage treatment tank, an air outlet seam 6 is arranged between the first lower partition plate 9 and the first baffle plate 11-1, a water outlet seam 7 is arranged between the first baffle plate 11-1 and the second baffle plate 11-2, and a sludge backflow seam 9 is arranged between the first lower partition plate 9 and the second baffle plate 11-2. In this embodiment, the included angles between the first lower partition plate 9 and the first baffle plate 11-1 and the second baffle plate 11-2 are both n, and the value range of n is 30-40 °.
The aerobic treatment zone 14 consists of a first partition plate 32, a second partition plate 31, a tank lower wall 3-2, a tank upper wall 3-4, a plurality of stirrers 12, a plurality of aeration heads 13, an aeration pipe 16, an air compressor 30, a bundle-shaped filler 15 and a first effluent weir 29; the tank body of the aerobic treatment zone 4 is enclosed by a first lower partition plate 9, a first partition plate 32, a second partition plate 31, a lower tank wall 3-2 and an upper tank wall 3-4, two sides of the first lower partition plate 9, the first partition plate 32 and the second partition plate 31 are respectively fixed on the lower tank wall 3-2 and the upper tank wall 3-4, the plurality of stirrers 12 are uniformly distributed at the bottom of the aerobic treatment zone 14, the aeration pipe 16 is arranged at the bottom of the aerobic treatment zone 14 and is communicated with an air compressor 30 on the ground through a pipeline, the plurality of aeration heads 13 are uniformly distributed on the aeration pipe 16, and the first water outlet weir 29 is fixedly connected with the second partition plate 31, the lower tank wall 3-2 and the upper tank wall 3-4 and serves as a water outlet of the aerobic treatment zone 14.
The inclined plate sedimentation zone 27 is composed of a second partition plate 30, a lower tank wall 3-2, a third partition plate 22, an upper tank wall 3-4, a second effluent weir 26, a plurality of sludge sedimentation baffle plates 28, a sludge reflux pump 18, a phosphorus-containing sludge reflux pipe 17, a sludge collecting hopper 19, a phosphorus-containing sludge recovery pipe 20, an effluent pump 25 and an effluent pipe 24, and a tank body of the inclined plate sedimentation zone 27 is enclosed by the second partition plate 31, the lower tank wall 3-2, the third partition plate 22 and the upper tank wall 3-4. The second effluent weir 26 is fixedly connected with the third partition plate 22, the lower tank wall 3-2 and the upper tank wall 3-4 and is positioned at the upper part of the inclined plate sedimentation zone 27, the included angles between the sludge sedimentation baffle plates 28 and the ground are beta, wherein the beta is 45-60 degrees, the sludge reflux pump 18 is connected with the phosphorus-containing sludge reflux pipe 17, the residual sludge generated in the inclined plate sedimentation zone 27 enters the sludge decomposition treatment zone 21 through the phosphorus-containing sludge recovery pipe 20, and the effluent pump 25 is communicated with the second effluent weir 26 and the effluent pipe 24 through pipelines.
A plurality of sedimentation baffles 28 are positioned above the sludge collecting hopper 19, one end of the water outlet pipe 24 is connected with the second water outlet weir 26 above the inclined plate sedimentation area, and the other end extends out of the sewage treatment tank; one end of a sewage return pipe 17 is connected with the bottom of the sludge collecting hopper 19, and the other end extends to the aerobic treatment area 14; one end of the sewage recovery pipe 20 is connected with the bottom of the sludge hopper 19, and the other end extends to the sludge decomposition treatment area 21.
The sludge rotten treatment area 21 is composed of a third partition plate 22, a lower tank wall 3-2, a right tank wall 3-3, an upper tank wall 3-4 and a feeding observation hole 23, a tank body of the sludge rotten treatment area 21 is formed by surrounding the third partition plate 22, the lower tank wall 3-2, the right tank wall 3-3 and the upper tank wall 3-4, and the feeding observation hole 23 is formed in the upper tank wall 3-4 and is located in the center of the upper tank wall 3-4 corresponding to the sludge rotten treatment area 21.
The buried phosphate fertilizer in-situ recycling device suitable for phosphorus-containing domestic sewage in new rural areas adopts an integrated structure, organically combines the anaerobic treatment area 4, the three-phase separation device 10, the aerobic treatment area 14, the inclined plate sedimentation area 27 and the sludge decomposition treatment area 21 together, and has the advantages of enhanced phosphorus removal, environmental protection, phosphorus recycling and the like when the integrated device is buried under the ground.
The working principle of the embodiment is as follows: phosphorus-containing sewage enters from an upper sewage inlet pipe 2 of an anaerobic treatment area 4 of a buried phosphate fertilizer on-site recycling device suitable for phosphorus-containing domestic sewage in new rural areas, and is continuously stirred and mixed in an anaerobic reaction area 4 through a stirrer 5, and anaerobic bacteria in the anaerobic treatment area 4 fully release phosphorus, degrade and absorb organic matters in the sewage, and convert the organic matters into PHAs and other substances. The sewage after anaerobic treatment enters a three-phase separation device 10, and gas, liquid and solid are separated in the three-phase separation device 10. The separated sewage enters an aerobic treatment area 14 of the buried phosphate fertilizer on-site recycling device suitable for phosphorus-containing domestic sewage in new rural areas through a water outlet seam 7 of a three-phase separation device 10, and phosphorus and residual organic matters which are difficult to degrade in the sewage are removed through the absorption and degradation effect of a biological film formed by a bundle-shaped filler 15 in the aerobic treatment area 14. The sewage treated by the aerobic treatment zone 14 enters the inclined plate sedimentation zone 27 of the buried phosphate fertilizer on-site recycling device suitable for phosphorus-containing domestic sewage in new rural areas through the first water outlet weir 29, solid-liquid separation is completed in the inclined plate sedimentation zone 27 by using a shallow pool sedimentation theory, solid substances sink into the sludge collecting hopper 19 under the action of gravity, supernatant liquid gradually rises, and the solid substances are collected by the second water outlet weir 26 and then discharged from the water outlet pipe 24, so that the sewage can be used for flushing toilets, greening irrigation and the like in families, and the recycling of reclaimed water is realized. Excess sludge generated in the inclined plate sedimentation zone 27 enters a sludge decomposition treatment zone 21 of the buried phosphate fertilizer on-site recycling device suitable for phosphorus-containing domestic sewage in new rural areas through a phosphorus-containing sludge recovery pipe 20, and undergoes a composting reaction with substances such as straws, wheat husks and the like added through the feeding observation holes 23, so that resource utilization of the excess sludge is realized, and part of phosphate fertilizer is recovered.
Example 2
The embodiment discloses a sewage treatment method, which is realized by using the buried phosphate fertilizer on-site recycling device in the embodiment 1, and comprises the following steps:
firstly, anaerobic treatment: enabling wastewater with COD (chemical oxygen demand) of 50-400 mg/L, BOD5 (biochemical oxygen demand) of 25-100 mg/L, total nitrogen of 5-10 mg/L and pH value of 7.2-7.5 to enter from an upper wastewater inlet pipe 2 of an anaerobic treatment zone 4 at a speed of 0.5-0.8 m/h, carrying out anaerobic reaction in the anaerobic reaction zone 4, continuously stirring and mixing through a stirrer 5, fully releasing phosphorus by using anaerobic bacteria, degrading and absorbing organic matters in the wastewater, converting the organic matters into PHAs and other substances, enabling the anaerobic treatment time to be 8-12 h, enabling the wastewater after anaerobic treatment to enter a three-phase separation device 10, and carrying out gas, liquid and solid separation in the three-phase separation device 10;
secondly, aerobic treatment: the separated sewage enters an aerobic treatment zone 14 through a water outlet slot 7 of a three-phase separation device 10, a biological film formed by a bundle-shaped filler 15 is adopted in the aerobic treatment zone 14 to absorb and degrade pollutants, namely, the hydraulic retention time is controlled to be 4-6 h, MLSS (mixed liquid suspended solid concentration) is controlled to be 400-500 mg/L, DO (dissolved oxygen) to be 3.0-6.0 mg/L, aerobic biological treatment is carried out, phosphorus and residual organic matters which are difficult to degrade in the sewage are removed, and the sewage treated by the aerobic treatment zone 14 enters an inclined plate sedimentation zone 27 through a first water outlet weir 29;
thirdly, inclined plate sedimentation treatment: the wastewater treated by the aerobic treatment zone 14 enters the inclined plate sedimentation zone 27 through the first effluent weir 29, solid-liquid separation is completed in the inclined plate sedimentation zone 27 by using a shallow pool sedimentation theory, namely DO (dissolved oxygen) is controlled to be 0.5-1.5 mg/L, total phosphorus is controlled to be 0.5-1.0 mg/L, sedimentation time is 3-5 h, solid substances sink into the sludge collecting hopper 19 under the action of gravity, supernatant liquid gradually rises, and is discharged from the water outlet pipe 24 for reuse after being collected by the second effluent weir 26, part of sludge in the sludge collecting hopper 19 flows back to the aerobic treatment zone 14 through the phosphorus-containing sludge return pipe 17, and the rest sludge enters the sludge rotten treatment zone 21 through the phosphorus-containing sludge recovery pipe 20;
fourthly, sludge decomposition treatment: after the excess sludge enters the sludge decomposition treatment area 21 through the phosphorus-containing sludge recovery pipe 20, the excess sludge and substances such as straws, wheat hulls and the like are added through the feeding observation hole 23 for composting treatment, so that the resource utilization of the excess sludge is realized, and part of phosphate fertilizer is recovered.
The sewage treatment method can realize the removal of total nitrogen and organic matters, the anaerobic treatment and the aerobic treatment are connected in series to realize the purposes of anaerobic phosphorus release and aerobic phosphorus absorption, the effective removal of the total nitrogen and the organic matters is realized under the degradation treatment effect of activated sludge, and meanwhile, the composting treatment is carried out on the residual sludge, so that the recycling, harmlessness and reclamation of phosphorus pollution of the domestic sewage in new rural areas can be realized.
The sewage treatment method of the embodiment utilizes the inclined plate sedimentation effect, shortens the sedimentation time of the particle sedimentation distance and improves the sewage treatment efficiency while increasing the sedimentation area of the sedimentation tank.
Example 3
This example differs from example 2 in that: the anaerobic treatment time in the step one is 8-10 h. The rest is the same as the second embodiment.
Example 4
This example differs from example 2 in that: and (2) controlling the hydraulic retention time to be 4-8 h and the MLSS (mixed solution suspended solid concentration) to be 450-550 mg/L, DO (dissolved oxygen) to be 4.0-6.0 mg/L for aerobic biological treatment. The rest is the same as in example 2.
Example 5
This example differs from example 2 in that: in the third step, DO (dissolved oxygen) is controlled to be 0.5-1.0 mg/L, total phosphorus is controlled to be 0.5-0.8 mg/L, and the precipitation time is 4-8 h. The rest is the same as in example 2.
The following tests were used to verify the effect of the invention:
test one: the sewage treatment method of the buried phosphate fertilizer on-site recycling device for phosphorus-containing domestic sewage in new rural areas is carried out according to the following steps:
firstly, anaerobic treatment: enabling wastewater with a COD (chemical oxygen demand) mean value of 398.73mg/L, BOD5 (biochemical oxygen demand) of 89.48mg/L, total nitrogen of 9.76mg/L and a pH value of 7.2-7.5 to enter from an upper sewage inlet pipe 2 of an anaerobic treatment area 4 at a speed of 0.8m/h, carrying out anaerobic reaction in the anaerobic reaction area 4, continuously stirring and mixing through a stirrer 5, fully releasing phosphorus by using anaerobic bacteria, degrading and absorbing organic matters in the wastewater, converting the organic matters into PHAs and other substances, enabling the anaerobic treatment time to be 9h, enabling the wastewater after anaerobic treatment to enter a three-phase separation device 10, and carrying out gas, liquid and solid separation in the three-phase separation device 10;
secondly, aerobic treatment: the separated sewage enters an aerobic treatment zone 14 through a water outlet slot 7 of a three-phase separation device 10, a biological film formed by a bundle-shaped filler 15 is adopted in the aerobic treatment zone 14 to absorb and degrade pollutants, namely, the hydraulic retention time is controlled to be 4h, the MLSS (mixed liquid suspended solid concentration) is controlled to be 533.78 mg/L, DO (dissolved oxygen) to be 5.57mg/L, the phosphorus and the residual organic matters which are difficult to degrade in the sewage are removed, and the sewage treated by the aerobic treatment zone 14 enters an inclined plate sedimentation zone 27 through a first water outlet weir 29;
thirdly, inclined plate sedimentation treatment: the wastewater treated by the aerobic treatment zone 14 enters the inclined plate sedimentation zone 27 through the first effluent weir 29, solid-liquid separation is completed in the inclined plate sedimentation zone 27 by using a shallow pool sedimentation theory, namely DO (dissolved oxygen) is controlled to be 1.15mg/L, total phosphorus is controlled to be 0.53mg/L, sedimentation time is 4 hours, solid matters are settled in the sludge collection hopper 19 under the action of gravity, supernatant liquid gradually rises, and after being collected by the second effluent weir 26, the solid matters are discharged from the water outlet pipe 24 for reuse as reclaimed water, part of sludge in the sludge collection hopper 19 flows back to the aerobic treatment zone 14 through the phosphorus-containing sludge return pipe 17, and the rest sludge enters the sludge rotten treatment zone 21 through the phosphorus-containing sludge recovery pipe 20;
fourthly, sludge decomposition treatment: after the excess sludge enters the sludge decomposition treatment area 21 through the phosphorus-containing sludge recovery pipe 20, the excess sludge and the mixture of straws and wheat hulls which are added through the feeding observation hole 23 are subjected to composting treatment, so that the resource utilization of the excess sludge is realized, and part of phosphate fertilizer is recovered.
GB18918-2002 Integrated wastewater discharge Standard is adopted to detect the indexes of the water outlet pipe of the test: COD (chemical oxygen demand) is 58.25 +/-14.05 mg/L, BOD5 (biochemical oxygen demand) is 9.43 +/-2.21 mg/L and total nitrogen is 0.53mg/L, which meets the GB secondary standard, wherein the removal rate of COD (chemical oxygen demand) is 85.39 percent and the removal rate of total nitrogen is 94.57 percent.
The foregoing description is only for the basic principle and the preferred embodiments of the present invention, and modifications and substitutions by those skilled in the art are included in the scope of the present invention.
Claims (4)
1. A sewage treatment method is characterized in that:
the buried phosphate fertilizer on-site recycling device comprises a sewage treatment tank, an anaerobic treatment area, an aerobic treatment area, an inclined plate sedimentation area and a sludge decomposition treatment area which are arranged in the sewage treatment tank in a segmented mode and are sequentially communicated, wherein a three-phase separation device for realizing gas-liquid-solid three-phase separation is arranged between the anaerobic treatment area and the aerobic treatment area; the upper part of the anaerobic treatment area is provided with a sewage inlet pipe, and the bottom of the anaerobic treatment area is provided with a plurality of stirrers; the aerobic treatment zone is internally provided with a bunchy filler, an aeration device and a stirrer, the aeration device and the stirrer are positioned at the bottom of the aerobic treatment zone, and the bunchy filler is positioned above the aeration device and the stirrer; the inclined plate sedimentation area is internally provided with sedimentation baffles, a sludge collecting hopper, a water outlet pipe, a phosphorus-containing sludge return pipe and a phosphorus-containing sludge recovery pipe, the sedimentation baffles are positioned above the sludge collecting hopper, one end of the water outlet pipe is connected with a water outlet device above the inclined plate sedimentation area, and the other end of the water outlet pipe extends out of the sewage treatment tank; one end of the phosphorus-containing sludge return pipe is connected with the bottom of the sludge collecting hopper, and the other end of the phosphorus-containing sludge return pipe extends to the aerobic treatment area; one end of the phosphorus-containing sludge recovery pipe is connected with the bottom of the sludge collecting hopper, and the other end of the phosphorus-containing sludge recovery pipe extends to the sludge decomposition treatment area; a feeding observation hole is formed in the top of the sludge decomposition treatment area;
the anaerobic treatment area and the aerobic treatment area are separated by a first partition plate, the aerobic treatment area and the inclined plate sedimentation area are separated by a second partition plate, and the inclined plate sedimentation area and the sewage decomposition treatment area are separated by a third partition plate; the three-phase separation device is positioned on the first partition plate, the second partition plate is provided with a first effluent weir which leads the sewage in the aerobic treatment zone to flow to the inclined plate sedimentation zone, and the third partition plate is provided with a second effluent weir which leads the water in the inclined plate sedimentation zone to flow out of the sewage treatment tank;
the three-phase separation device comprises a first lower partition plate, a first baffle plate and a second baffle plate, wherein the first lower partition plate is arranged on the first partition plate, a hole with a certain length is reserved between the upper end and the lower end of the first lower partition plate and the first partition plate, the first baffle plate is obliquely arranged at the lower end of the first partition plate, the second baffle plate is obliquely arranged at the joint of the first partition plate and the lower wall of the sewage treatment tank, an air outlet seam is arranged between the first lower partition plate and the first baffle plate, a water outlet seam is arranged between the first baffle plate and the second baffle plate, and a sludge backflow seam is arranged between the first lower partition plate and the second baffle plate;
the included angles among the first lower baffle plate, the first baffle plate and the second baffle plate are n, and the value range of n is 30-40 degrees;
an included angle between the settling baffle and the ground is beta, wherein the value range of beta is 45-60 degrees;
the method is based on the buried phosphate fertilizer on-site recycling device and comprises the following steps: s01), anaerobic treatment: introducing wastewater with a chemical oxygen demand of 50-400 mg/L, a biochemical oxygen demand of 25-100 mg/L, a total nitrogen concentration of 5-10 mg/L and a pH value of 7.2-7.5 into an anaerobic treatment area from an upper sewage inlet pipe of the anaerobic treatment area at a speed of 0.5-0.8 m/h, carrying out anaerobic reaction in the anaerobic treatment area, continuously stirring and mixing through a stirrer, fully releasing phosphorus by using anaerobic bacteria, degrading and absorbing organic matters in the wastewater, converting the organic matters into PHAs, wherein the anaerobic treatment time is 8-12 h, introducing the anaerobic-treated wastewater into a three-phase separation device, and carrying out gas, liquid and solid separation in the three-phase separation device; the sewage is rural phosphorus-containing domestic sewage;
s02), aerobic treatment: the separated sewage enters an aerobic treatment zone through a water outlet seam of a three-phase separation device, a biological film formed by a bundle-shaped filler is adopted in the aerobic treatment zone to absorb and degrade pollutants, namely, the hydraulic retention time is controlled to be 4-6 h, the suspended solid concentration of the mixed liquid is 400-500 mg/L, and the dissolved oxygen is 3.0-6.0 mg/L, so that aerobic biological treatment is carried out, phosphorus and the rest of organic matters which are difficult to degrade in the sewage are removed, and the sewage treated by the aerobic treatment zone enters an inclined plate precipitation zone through a first water outlet weir;
s03), inclined plate sedimentation treatment: the wastewater treated by the aerobic treatment zone enters an inclined plate precipitation zone through a first effluent weir, solid-liquid separation is completed in the inclined plate precipitation zone by using a shallow pool precipitation theory, namely, dissolved oxygen is controlled to be 0.5-1.5 mg/L, total phosphorus is controlled to be 0.5-1.0 mg/L, the precipitation time is 3-5 h, solid substances are precipitated into a sludge collecting hopper under the action of gravity, supernatant liquid gradually rises, and after being collected by a second effluent weir, reclaimed water is discharged from a water outlet pipe for recycling, part of sludge in the sludge collecting hopper flows back to the aerobic treatment zone through a phosphorus-containing sludge return pipe, and the rest sludge enters a sludge rotten treatment zone through a phosphorus-containing sludge recycling pipe;
s04), sludge decomposition treatment: after the excess sludge enters the sludge decomposition treatment area through the phosphorus-containing sludge recovery pipe, composting treatment is carried out on the excess sludge and the straws and wheat husks added through the feeding observation hole, resource utilization of the excess sludge is realized, and part of phosphate fertilizer is recovered.
2. The wastewater treatment method according to claim 1, characterized in that: aeration equipment includes air compressor machine, aeration pipe and a plurality of aeration head, and aeration pipe one end links to each other with the air compressor machine, and the other end extends to aerobic treatment district bottom, and a plurality of aeration heads set up on the aeration pipe of aerobic treatment district bottom, and the aeration head is located the below of agitator.
3. The wastewater treatment method according to claim 1, characterized in that: the volume ratio of the anaerobic treatment area to the aerobic treatment area is 1: 2.
4. The wastewater treatment method according to claim 1, characterized in that: the anaerobic treatment area, the three-phase separation device, the aerobic treatment area, the inclined plate sedimentation area and the sludge decomposition treatment area are buried under the ground.
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