CN105601040A - Ferric salt nitrogen and phosphorous removal device - Google Patents

Abstract

An iron salt denitrification and phosphorus removal device includes a regulating tank, an iron salt denitrification and phosphorus removal tank and a baffle type aerated biochemical filter; the iron salt denitrification and phosphorus removal tank includes a phosphorus removal stirring mixing reaction zone, a sedimentation separation zone, The biochemical denitrification area and filtration area, the upper part of the phosphorus removal stirring and mixing reaction area are equipped with iron salt denitrification and phosphorus removal pool inlet pipes and return pipes, and the phosphorus removal stirring mixing reaction area is equipped with a phosphorus removal agent adding and metering system. There is a partition between the mixing reaction area and the sedimentation separation area, and a sediment discharge valve is installed at the bottom of the sedimentation separation area; the biochemical denitrification area is located on the upper part of the sedimentation separation area, and there is a partition net between the sedimentation separation area and the biochemical denitrification area , the upper part of the net is equipped with iron filings, the filter area is located in the upper part of the biochemical denitrification area, the filter material of the denitrification area is set in the filter area, and the upper part of the iron salt denitrification and phosphorus removal tank is equipped with a waste gas collection pipe; baffled aeration The upper part of the biochemical filter is cylindrical and the lower part is a conical structure, including the downstream area, the upstream area and the sludge area.

Description

An iron salt denitrification and dephosphorization device

technical field

The invention relates to the technical field of wastewater treatment, in particular to an iron salt denitrification and dephosphorization device.

Background technique

The frequent occurrence of "water blooms" in lakes and "red tides" in coastal waters caused by nitrogen and phosphorus pollution has endangered many industries such as agriculture, fishery, tourism, and poses a serious threat to drinking water sanitation and food safety. The amount of nitrogen and phosphorus pollutants is large and wide, and its control has become a major environmental protection issue to be solved urgently in our country.

Due to the various hazards of nitrogen pollution, the control of nitrogen pollution in wastewater has received extensive attention from the international community. Wastewater denitrification technologies are mainly divided into two categories: physical and chemical methods and biological methods. Among them, the biological method has been widely used because of its advantages of cost-effectiveness and environmental friendliness. Biological denitrification of wastewater mainly includes nitrification, denitrification, short-cut nitrification and anammox A new type of biological denitrification technology represented. With the breakthrough of biological nitrogen removal theory and technology, new biological nitrogen removal technologies represented by short-cut nitrification process and anammox process continue to emerge. Wastewater biological treatment technology is the mainstream technology of wastewater treatment. The new denitrification technology represented by short-range nitrification and anammox process has brought prospects for efficient and low-consumption denitrification of wastewater. However, due to the complexity of the control of the short-cut nitrification process and the anammox process, the difficulty of cultivating anammox bacteria and the long doubling time and other limitations, the number of practical engineering applications has so far been small. The traditional denitrification technology represented by nitrification and denitrification process will remain the mainstream technology for wastewater biological denitrification for a period of time in the future. In wastewater treatment technology, after biological treatment, the concentration of COD in wastewater basically reaches the standard, but the concentration of nitrogen and phosphorus still exceeds the standard. For such wastewater with a low C:N ratio, the traditional biological denitrification process has been weak, because the denitrification process requires electron donors, usually provided by organic matter. The relative shortage of carbon sources has become a major bottleneck factor for traditional biological denitrification technologies.

Phosphorus is one of the main causes of water eutrophication, and phosphorus removal from wastewater is an effective way to prevent water eutrophication. Wastewater phosphorus removal technology is mainly divided into two categories: chemical method and biological method. Biological methods have been widely used because of their advantages of cost-effectiveness and environmental friendliness. But at the same time, it also faces problems such as long reaction time, large equipment footprint, and difficult sludge treatment. The chemical phosphorus removal method has been popularized and applied because of its advantages of cost-effectiveness, simple operation, reliable effect, and not easily affected by the quality of wastewater. So far, chemical phosphorus removal method is still the main phosphorus removal process. Chemical phosphorus removal mainly forms insoluble phosphate precipitates by adding chemicals to wastewater, and then removes phosphorus from sewage through solid-liquid separation. Because iron-based flocculants are cheap and have good removal effects on phosphorus pollutants under various water quality conditions, they are widely used. Chemical phosphorus removal technology from wastewater is an effective way to prevent phosphorus pollution in water bodies. Although iron salt is widely used in wastewater phosphorus removal, showing the advantages of simple process, efficient phosphorus removal, and stable operation, there are still problems such as large dosage of chemicals and high sludge production. Therefore, the iron salt phosphorus removal process needs to be systematically developed optimization.

Contents of the invention

The technical problem to be solved by the present invention is: in order to solve the above-mentioned difficult problems in the treatment of high-nitrogen and phosphorus wastewater, the present invention provides an iron salt denitrification and dephosphorization device.

The technical solution adopted by the present invention to solve the technical problem is: a device for denitrification and dephosphorization of iron salts, including a regulating tank, a denitrification and dephosphorization tank for ferric salts and a baffle type aerated biochemical filter, the regulating tank, iron The salt denitrification and phosphorus removal tank and the baffle type aerated biochemical filter are connected in sequence.

The regulating pond includes a regulating pond inlet pipe and a regulating pond outlet pipe for regulating the water quality and water quantity of high nitrogen and phosphorus wastewater.

The iron salt denitrification and phosphorus removal pool includes a phosphorus removal stirring and mixing reaction area, a precipitation separation area, a biochemical denitrification area and a filtration area; the upper part of the phosphorus removal stirring mixing reaction area is equipped with an iron salt denitrification and phosphorus removal pool The water inlet pipe and the return pipe for receiving wastewater from the biochemical denitrification area, the phosphorus removal agent addition and metering system are installed in the upper part of the phosphorus removal stirring mixing reaction area, the stirring device is installed in the middle of the phosphorus removal stirring mixing reaction area, and the phosphorus removal stirring mixing reaction area The bottom of the tank is designed with a 45-degree inclined bottom plate or an arc-shaped bottom plate to avoid dead corners of water flow; a partition is provided between the stirring and mixing reaction zone for phosphorus removal and the precipitation separation zone, and the partition and the iron salt denitrification and phosphorus removal pool The bottom plate of the bottom plate forms a water flow channel, and the bottom of the sedimentation separation area is designed as a conical structure, and a sediment discharge valve is arranged at the lower end of the conical structure; There is a screen between the areas, and iron filings are arranged on the upper part of the screen; the filter area is located on the upper part of the biochemical denitrification area, and the filter material of the denitrification area is provided in the filter area, and the iron salt denitrification area is installed on the upper part of the filter area. The overflow weir of the phosphorus removal tank, the overflow weir of the iron salt denitrification and phosphorus removal tank is connected to the outlet pipe of the iron salt denitrification and phosphorus removal tank; the upper part of the iron salt denitrification and phosphorus removal tank is provided with a conical upper cover, and the top of the Exhaust gas collection pipe.

The outlet pipe of the iron salt denitrification and phosphorus removal tank is connected with the water inlet pipe of the baffle type aerated biochemical filter.

The upper part of the baffle type aerated biochemical filter is cylindrical and the lower part is a conical structure, including a downstream area, an upper flow area and a sludge area; the downstream area is located in the cylindrical structure of the baffled aerated biochemical filter The middle part is a cylindrical structure. The upper part of the downstream area is equipped with a baffle type aerated biochemical filter inlet pipe and a baffled aerated biochemical filter water distribution pipe. Area aeration pipe, the bottom of the downstream area is provided with a baffle plate, and the longitudinal section of the baffle plate is trumpet-shaped; There is filler in the upstream area, the lower part is equipped with an aeration pipe in the upstream area, and the outlet of the upper part of the upstream area is provided with an overflow weir of a baffled aerated biochemical filter; the sludge area is located at the bottom of the baffled biochemical aerated filter, The lower part of the downstream zone and the upstream zone, and the bottom of the sludge zone are provided with a baffle type aerated biochemical filter sludge discharge valve.

A method for wastewater treatment using the above-mentioned iron salt denitrification and phosphorus removal device has the following steps:

①Wastewater enters the regulating pond through the inlet pipe of the regulating pond to adjust the water quality and quantity.

② Then the wastewater enters the iron salt denitrification and phosphorus removal tank through the inlet pipe of the iron salt denitrification and phosphorus removal tank, and is mixed with the return wastewater from the return pipe and the dephosphorization agent from the dephosphorization agent addition and metering system, and the mixed solution is mixed by the stirring device Stir and mix to carry out chemical phosphorus removal reaction. After the reaction, the waste water enters the sedimentation separation area through the water flow channel formed by the separator and the bottom plate of the iron salt denitrification and phosphorus removal tank for solid-liquid separation, and the sediment sinks to the sedimentation area under the action of gravity. The lower part of the separation zone is discharged through the sediment discharge valve at the bottom.

③The wastewater after precipitation enters the biochemical denitrification area through the separation net between the sedimentation separation area and the biochemical denitrification area. Biochemical denitrification, the wastewater after biochemical denitrification enters the filter area for filtration, and the filtered wastewater enters the baffled aerated biochemical filter through the overflow weir of the iron salt denitrification and phosphorus removal tank and the outlet pipe of the iron salt denitrification and phosphorus removal tank. water pipe.

④ The methane waste gas generated by the iron salt denitrification and phosphorus removal tank is collected and discharged through the waste gas collection pipe on the top of the conical upper cover of the iron salt denitrification and phosphorus removal tank.

⑤Wastewater enters the downstream area of the baffled aerated biochemical filter through the water inlet pipe of the baffled aerated biochemical filter and the water distribution pipe of the baffled aerated biochemical filter. Biochemical reactions occur at the intersection of the fillers, and at the same time, the fillers in the downstream area filter the wastewater. The sludge sinks to the sludge area and is discharged through the sludge discharge valve at the bottom of the sludge area, and the water treated by the baffle type aerated biochemical filter is discharged up to the standard through the overflow weir of the baffle type aerated biochemical filter.

⑥ The sediment produced by the iron salt denitrification and phosphorus removal tank and the remaining sludge produced by the baffle type aerated biochemical filter are dehydrated and then shipped out.

The invention has the beneficial effects of adapting measures to local conditions, less infrastructure investment, convenient maintenance, lower energy consumption, and better treatment effect on high-nitrogen and phosphorus wastewater.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a schematic structural view of an iron salt denitrification and dephosphorization pool according to an embodiment of the present invention.

In Figure 1: 1. Iron salt denitrification and phosphorus removal pool, 1-1. Phosphorus removal stirring mixed reaction zone, 1-2. Precipitation separation zone, 1-3. Biochemical denitrification zone, 1-4. Filtration zone, 1 -5. Inlet pipe of iron salt denitrification and phosphorus removal pool, 1-6. Return pipe, 1-7. Dephosphorization agent addition and metering system, 1-8. Stirring device, 1-9. Partition plate, 1-10. Sediment discharge valve, 1-11. Screen separation, 1-12. Filter material in denitrification area, 1-13. Overflow weir of iron salt denitrification and phosphorus removal tank, 1-14. Upper cover, 1-15. Waste gas collection pipe .

Fig. 2 is a schematic structural view of a baffle type aerated biochemical filter according to an embodiment of the present invention.

Among Fig. 2: 2. baffle type aerated biochemical filter, 2-1. downstream area, 2-2. upflow area, 2-3. sludge area, 2-4. baffle type aerated biochemical filter enters Water pipes, 2-5. Distributing pipes of baffled aerated biochemical filter, 2-6. Filling in downstream area, 2-7. Aeration pipe in downstream area, 2-8. Baffle plate, 2-9. Filling in upstream area , 2-10. Baffled aerated biochemical filter overflow weir, 2-11. Sludge discharge valve.

Fig. 3 is a process flow diagram of an embodiment of the present invention.

detailed description

The present invention is described in further detail now in conjunction with accompanying drawing. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

Example

As shown in Figures 1 to 3, an iron salt denitrification and phosphorus removal device of the present invention includes a regulating tank, a ferric salt denitrification and phosphorus removal tank 1 and a baffle type aerated biochemical filter tank 2, the regulating tank, iron The salt denitrification and phosphorus removal tank 1 and the baffle type aerated biochemical filter tank 2 are connected in sequence.

The regulating pond includes a regulating pond inlet pipe and a regulating pond outlet pipe for regulating the water quality and water quantity of high nitrogen and phosphorus wastewater.

The iron salt denitrification and phosphorus removal pool 1 includes a phosphorus removal stirring and mixing reaction zone 1-1, a precipitation separation zone 1-2, a biochemical denitrification zone 1-3 and a filtration zone 1-4; the phosphorus removal stirring and mixing The upper part of the reaction zone 1-1 is equipped with the inlet pipe 1-5 of the iron salt denitrification and phosphorus removal pool and the return pipe 1-6 for receiving the wastewater from the biochemical denitrification zone. And the metering system 1-7, the middle part of the phosphorus removal stirring mixing reaction zone is provided with a stirring device 1-8, and the bottom of the phosphorus removal stirring mixing reaction zone is designed with an inclined bottom plate or an arc bottom plate at an angle of 45 degrees, so as to avoid the dead angle of water flow; A partition 1-9 is arranged between the stirred mixing reaction zone and the precipitation separation zone for phosphorus removal, and the partition plate and the bottom plate of the iron salt denitrification and phosphorus removal tank form a water flow channel, and the bottom of the precipitation separation zone is designed as a conical structure. The lower end of the structure is provided with a sediment discharge valve 1-10; the biochemical denitrification zone 1-3 is located on the upper part of the sedimentation separation zone 1-2, and a screen 1-11 is arranged between the sedimentation separation zone and the biochemical denitrification zone , the upper part of the net is equipped with iron filings; the filter area 1-4 is located on the top of the biochemical denitrification area 1-3, the filter area is provided with a denitrification area filter material 1-12, and the upper part of the filter area is provided with iron salt The overflow weir 1-13 of the denitrification and phosphorus removal pool, the overflow weir of the iron salt denitrification and phosphorus removal pool is connected to the outlet pipe of the iron salt denitrification and phosphorus removal pool; the upper part of the iron salt denitrification and phosphorus removal pool is provided with a conical upper cover 1-14, The top of the conical loam cake is provided with a waste gas collecting pipe 1-15.

The outlet pipe of the iron salt denitrification and phosphorus removal tank is connected with the water inlet pipe 2-4 of the baffle type aerated biochemical filter.

The middle and upper part of the baffle type aerated biochemical filter 2 is cylindrical, and the lower part is a conical structure, including a downstream zone 2-1, an upstream zone 2-2 and a sludge zone 2-3; the downstream zone 2- 1 Located in the middle of the cylindrical structure of the baffled aerated biochemical filter, it is a cylindrical structure, and the upper part of the downstream area is provided with the water inlet pipe 2-4 of the baffled aerated biochemical filter and the cloth of the baffled aerated biochemical filter The water pipe 2-5, the middle part of the downstream area is provided with the filler 2-6 in the downstream area, the lower part of the downstream area is provided with the aeration pipe 2-7 in the downstream area, and the bottom of the downstream area is provided with a baffle plate 2-8. The longitudinal section of the flow plate 2-8 is trumpet-shaped; the upper flow area 2-2 is located at the periphery of the lower flow area 2-1 and the upper part of the baffle, and the middle part of the upper flow area is provided with an upper flow area filler 2-9, and the lower part is provided with an upper flow area. District aeration pipe, the outlet of the upper part of the upstream area is provided with a baffle type aerated biochemical filter overflow weir 2-10; the sludge area 2-3 is located at the bottom of the baffled type aerated biochemical filter, the downstream area and A sludge discharge valve 2-11 is provided at the bottom of the upstream zone and the bottom of the sludge zone.

A method for wastewater treatment using the above-mentioned iron salt denitrification and phosphorus removal device has the following steps:

①Wastewater enters the regulating pond through the inlet pipe of the regulating pond to adjust the water quality and quantity.

② Then the wastewater enters the iron salt denitrification and phosphorus removal tank 1 through the inlet pipe 1-5 of the iron salt denitrification and phosphorus removal tank, and is mixed with the return wastewater from the return pipe 1-6 and the dephosphorization agent addition and metering system 1-7. Phosphorus agent is mixed, the mixing device 1-8 is used to stir and mix the mixed liquid, and the chemical phosphorus removal reaction is carried out, and the waste water after the reaction enters the sedimentation separation area through the water flow channel formed by the separator 1-9 and the bottom plate of the iron salt denitrification and phosphorus removal tank 1-2 for solid-liquid separation, the sediment sinks to the lower part of the sedimentation separation area under the action of gravity, and is discharged through the sediment discharge valve 1-10 at the bottom.

③The wastewater after precipitation enters the biochemical denitrification zone 1-3 through the separation screen 1-11 between the precipitation separation area and the biochemical denitrification area, and the waste water dissolves the iron filings on the separation screen into ferrous iron. Enter the biochemical denitrification area for biological denitrification, the wastewater after biochemical denitrification enters the filter area 1-4 for filtration, and the filtered wastewater passes through the overflow weir 1-13 of the iron salt denitrification and phosphorus removal pool, and the iron salt denitrification and phosphorus removal pool The water outlet pipe enters the water inlet pipe 2-4 of the baffle type aerated biochemical filter.

④ The methane waste gas produced by the iron salt denitrification and phosphorus removal tank 1 is collected and discharged through the waste gas collection pipe 1-15 on the top of the conical upper cover of the iron salt denitrification and phosphorus removal tank.

⑤Wastewater enters the downstream area 2-1 of the baffled aerated biochemical filter through the water inlet pipe 2-4 of the baffled aerated biochemical filter and the water distribution pipe 2-5 of the baffled aerated biochemical filter, and the downstream area is aerated The air generated by the pipe 2-7 and the waste water meet in the filler 2-6 in the downstream area to undergo a biochemical reaction. At the same time, the filler 2-6 in the downstream area filters the waste water, and the waste water enters the upstream area 2-2 after passing through the baffle plate 2-8. The biochemical reaction occurs in the packing 2-9 in the upstream area, and at the same time, the packing 2-9 in the upstream area filters the waste water, and the sludge produced in the downstream area and the upstream area sinks to the sludge area 2-3, and passes through the sludge at the bottom of the sludge area. The mud discharge valve 2-11 is discharged, and the water treated by the baffle type biochemical aerated filter is discharged up to the standard through the overflow weir 2-10 of the baffle type biochemical aerated filter.

⑥ The sediment produced in the iron salt denitrification and phosphorus removal tank 1 and the excess sludge produced in the baffle type aerated biochemical filter 2 are dehydrated and transported outside.

Inspired by the above-mentioned ideal embodiment according to the present invention, through the above-mentioned description content, relevant workers can make various changes and modifications within the scope of not departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, but must be determined according to the scope of the claims.

Claims (2)

1. An iron salt denitrification and phosphorus removal device is characterized in that: it comprises a regulating pond, a ferric salt denitrification and dephosphorization pond (1) and a baffle type aerated biochemical filter (2), and the regulating pond, the ferric salt The denitrification and phosphorus removal pool (1) and the baffle type aerated biochemical filter (2) are sequentially connected; The regulating pond includes a regulating pond inlet pipe and a regulating pond outlet pipe for regulating the water quality and quantity of high nitrogen and phosphorus wastewater; The iron salt denitrification and phosphorus removal pool (1) includes a phosphorus removal stirring and mixing reaction zone (1-1), a precipitation separation zone (1-2), a biochemical denitrification zone (1-3) and a filtration zone (1- 4); the upper part of the stirring and mixing reaction zone for phosphorus removal (1-1) is provided with an iron salt denitrification and phosphorus removal pool inlet pipe (1-5) and a return pipe (1-5) for receiving waste water from the biochemical denitrification zone 6), phosphorus removal agent addition and metering system (1-7) is installed in the upper part of the phosphorus removal stirring and mixing reaction zone, a stirring device (1-8) is arranged in the middle of the phosphorus removal stirring and mixing reaction zone, and the bottom of the phosphorus removal stirring and mixing reaction zone A sloping bottom plate or a curved bottom plate with a 45-degree angle is designed to avoid dead corners of water flow; a partition (1-9) is provided between the stirring mixing reaction zone for phosphorus removal and the precipitation separation zone, and the partition and iron salt denitrification The bottom plate of the phosphorus removal tank forms a water flow channel, and the bottom of the sedimentation separation area is designed as a conical structure, and a sediment discharge valve (1-10) is arranged at the lower end of the conical structure; the biochemical denitrification area (1-3) is located at On the upper part of the precipitation separation area (1-2), a partition (1-11) is provided between the precipitation separation area and the biochemical denitrification area, and iron filings are arranged on the top of the partition; the filter area (1-4) is located at On the upper part of the biochemical denitrification zone (1-3), filter material (1-12) in the denitrification zone is set in the filter zone, and the overflow weir (1-13) of the iron salt denitrification and phosphorus removal pool is set on the upper part of the filter zone. The overflow weir of the salt denitrification and phosphorus removal tank is connected to the outlet pipe of the iron salt denitrification and phosphorus removal tank; the upper part of the iron salt denitrification and phosphorus removal tank is provided with a conical upper cover (1-14), and the top of the conical upper cover is provided with a waste gas collection Tube (1-15); The outlet pipe of the iron salt denitrification and phosphorus removal tank is connected with the water inlet pipe (2-4) of the baffle type aerated biochemical filter; The middle and upper part of the baffle type aerated biochemical filter (2) is cylindrical, and the lower part is a conical structure, including a downstream area (2-1), an upstream area (2-2) and a sludge area (2-3 ); the downstream area (2-1) is located in the middle part of the cylindrical structure of the baffled biochemical aerated filter, and is a cylindrical structure, and the upper part of the downstream area is provided with a baffled biochemical aerated filter inlet pipe (2-1) 4) and the water distribution pipe (2-5) of the baffle type aerated biochemical filter, the downstream area filler (2-6) is provided in the middle of the downstream area, and the downstream area aeration pipe (2-7) is provided in the lower part of the downstream area. The bottom of the downstream area is provided with a baffle (2-8), and the longitudinal section of the baffle (2-8) is trumpet-shaped; the upstream area (2-2) is located in the downstream area (2-1 ), the upper part of the baffle, the upper part of the upper part of the upper part is provided with fillers (2-9) in the upper part, the lower part is provided with the aeration pipe of the upper part, and the outlet of the upper part of the upper part is provided with the overflow of the baffle type aerated biochemical filter Weir (2-10); the sludge area (2-3) is located at the bottom of the baffle type aerated biochemical filter, the bottom of the downstream area and the upper area, and the bottom of the sludge area is provided with a sludge discharge valve (2 -11). 2. The method for wastewater treatment using the above-mentioned iron salt denitrification and phosphorus removal device is characterized in that: it has the following steps; ①Wastewater enters the regulating pool through the water inlet pipe of the regulating pool to adjust the water quality and quantity; ② Then the wastewater enters the iron salt denitrification and phosphorus removal tank (1) through the iron salt denitrification and phosphorus removal tank inlet pipe (1-5), and the backflow wastewater from the return pipe (1-6) and the dephosphorization agent are added and measured The phosphorus removal agent in the system (1-7) is mixed, and the stirring device (1-8) stirs and mixes the mixed solution to perform a chemical phosphorus removal reaction, and the reacted wastewater passes through the separator (1-9) and iron salt denitrification The water flow channel formed by the bottom plate of the phosphorus tank enters the sedimentation separation area (1-2) for solid-liquid separation, and the sediment sinks to the lower part of the sedimentation separation area under the action of gravity, and passes through the sediment discharge valve (1-10) at the bottom discharge; ③The sedimented wastewater enters the biochemical denitrification zone (1-3) through the screen (1-11) between the sedimentation separation zone and the biochemical denitrification zone, and the wastewater dissolves the iron filings on the grid into ferrous iron, containing The wastewater with high iron content enters the biochemical denitrification zone for biochemical denitrification, and the wastewater after biochemical denitrification enters the filter zone (1-4) for filtration, and the filtered wastewater passes through the overflow weir of the iron salt denitrification and phosphorus removal pool (1-13) , The outlet pipe of the iron salt denitrification and phosphorus removal tank enters the water inlet pipe of the baffle type aerated biochemical filter (2-4); ④ The methane waste gas produced by the iron salt denitrification and phosphorus removal tank (1) is collected and discharged through the waste gas collection pipe (1-15) on the top of the conical upper cover of the iron salt denitrification and phosphorus removal tank; ⑤Wastewater enters the downstream area of the baffled aerated biochemical filter through the water inlet pipe (2-4) of the baffled aerated biochemical filter and the water distribution pipe (2-5) ), the air generated by the aeration pipe (2-7) in the downstream area and the waste water meet in the filler (2-6) in the downstream area to undergo a biochemical reaction, while the filler (2-6) in the downstream area filters the waste water, and the waste water passes through the baffle After the plate (2-8) enters the upstream area (2-2), a biochemical reaction occurs in the upstream area packing (2-9), while the upstream area packing (2-9) filters the waste water, and the downstream area (2-1 ) and the sludge generated in the upstream zone (2-2) sinks to the sludge zone (2-3), and is discharged through the sludge discharge valve (2-11) at the bottom of the sludge zone, and the baffle type aerated biochemical filter The water treated in the pond is discharged up to the standard through the overflow weir (2-10) of the baffle type aerated biochemical filter; ⑥ The sediment produced in the iron salt denitrification and phosphorus removal tank (1) and the excess sludge produced in the baffle type aerated biochemical filter (2) are dehydrated and transported outside.