Enhanced denitrification type improved biological aerated filter

Abstract

The utility model relates to an enhanced denitrification type improved biological aerated filter, which belongs to the technical field of water treatment and comprises a water inlet area, a reaction area, a multifunctional water tank, a backwashing system and a water outlet area. The water inlet area comprises a water inlet distribution tank and a water outlet pipe; the bottom of the water inlet distribution tank is connected with the lower end of the reaction area through the water outlet pipe; a filter plate layer, a pebble supporting layer, a ceramsite filter material layer and a contact denitrification layer are sequentially arranged in the reaction region from bottom to top; a saturated resin capturing device is arranged in the multifunctional water tank, the bottom of the multifunctional water tank is respectively connected with a resin collecting device and a lifting pump through a main discharge pipe, the discharge end of the lifting pump is connected with the upper end of the reaction area through a resin supplementing pipe, and the reaction area is connected with the resin capturing device through a resin discharge pipe; the top end of the reaction area is connected with the water outlet area through a water outlet weir. The filter tank can remove total nitrogen in a targeted manner, and is good in treatment effect, small in occupied area, low in operation cost, simple to operate, quick to start, stable to operate and high in applicability.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to an enhanced denitrification type improved aerated biological filter. Background Art

[0002] Aerated biological filter, referred to as BAF, is a new type of biofilm wastewater treatment process developed in Europe and the United States in the late 1980s. It was greatly developed in the early 1990s, with the largest scale reaching hundreds of thousands of tons per day, and it has been developed to remove nitrogen and phosphorus. This process has the functions of removing SS, COD, BOD, nitrification, denitrification, phosphorus removal, and removal of AOX (harmful substances). For the removal of total nitrogen, its core is still the biological process of using denitrifying bacteria to degrade nitrate into nitrogen gas by biofilm method. The application scope of biological method for removing total nitrogen is limited and the process conditions are difficult to control. Therefore, if the total nitrogen index of water quality is to be stable and meet the standard, a total nitrogen removal process must be designed, resulting in a lengthy process design route and a large area.

[0003] Therefore, it is necessary to design an enhanced denitrification improved aerated biological filter to overcome the above problems. Utility Model Content

[0004] The utility model aims to provide an enhanced denitrification improved aerated biological filter, which is simple and efficient, and adds a contact denitrification layer for denitrification by resin adsorption to carry out targeted removal of total nitrogen, so as to achieve the purpose of stable removal of total nitrogen as an indicator, reduce operating costs, improve operating efficiency, and save energy and protect the environment.

[0005] The utility model provides an enhanced denitrification type improved aerated biological filter, comprising: an inlet area, a reaction area, a multifunctional water pool, a backwashing system and an outlet area;

[0006] The water inlet area includes a water inlet distribution trough and a water outlet pipe. The water inlet distribution trough is located above the reaction area, and the bottom of the water inlet distribution trough is connected to the lower end of the reaction area through the water outlet pipe; the lower end of the reaction area is provided with a water distribution area connected to the water outlet pipe, and the reaction area is provided with a filter plate layer, a pebble support layer, a ceramsite filter material layer and a contact denitrification layer from bottom to top, and they are all located above the water distribution area; a saturated resin capture device is provided in the multifunctional water pool, and the bottom of the multifunctional water pool is respectively connected to the resin collection device and the lifting pump through the discharge main pipe, and the discharge end of the lifting pump is connected to the resin replenishment pipe through the resin replenishment pipe. The upper end of the reaction zone is connected to replenish resin into the contact denitrification layer, and the side walls corresponding to the lower ends of the reaction zone and the contact denitrification layer are connected to the resin capture device through a resin discharge pipe; the backwash system includes a backwash air pipe, a backwash water pipe, a backwash drainage pipe, and a backwash aeration fan, the backwash aeration fan is connected to the water distribution area through the backwash air pipe, one end of the backwash water pipe is connected to the discharge end of the lift pump, and the other end is connected to the water distribution area, the backwash drainage pipe is connected to the reaction zone and is located below the contact denitrification layer; the top of the reaction zone is connected to the water outlet area through a water outlet weir.

[0007] Furthermore, the filter plate layer includes a filter plate and a long-handled filter head. The filter plate is supported by multiple vertical filter beams and arranged in the reaction zone. The filtering end of the long-handled filter head is above the filter plate, and the long-handled end extends into the water distribution zone.

[0008] Furthermore, an aeration coil is arranged between the filter plate layer and the pebble supporting layer, and the aeration coil is connected to the aeration fan through an aeration main pipe.

[0009] Furthermore, the contact denitrification layer includes two steel plates arranged opposite to each other up and down and a resin filled between the two steel plates. The two steel plates are provided with a plurality of micro holes with a pore size not greater than 0.3 mm.

[0010] Furthermore, the contact denitrification layer is filled with a resin filler, which is a macroporous anionic nitrate ion resin, with a spherical particle appearance, a polystyrene copolymer skeleton, a quaternary amine functional group, a particle size range of 0.3-1.2 mm, and a total exchange capacity of 1000 mol / m 3 Chlorine type, water content is 52±3% chlorine type, loading density is 700-750g / l.

[0011] Furthermore, the upper end of the reaction zone is connected to the discharge end of the lift pump through a plurality of resin replenishing pipes, and the upper end of the reaction zone is connected to the resin capturing device through a plurality of resin discharge pipes.

[0012] Furthermore, the bottom of the water outlet area is connected to the water inlet end of the multifunctional water pool through a purified water outlet pipe.

[0013] Furthermore, the bottom of the multifunctional pool has a structure that is wide at the top and narrow at the bottom.

[0014] Furthermore, the resin capture device is provided with a plurality of micro holes with a pore size not greater than 0.3 mm.

[0015] The utility model has the following advantages and beneficial effects: the filter tank is equipped with a contact denitrification layer for denitrification by resin adsorption to carry out targeted removal of total nitrogen, so as to achieve the purpose of stable removal of total nitrogen as an indicator, with good treatment effect, low investment, small footprint, low operating cost, simple operation, fast activation, stable operation and strong applicability, and is suitable for upgrading and transformation of sewage treatment plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A top view of an enhanced denitrification improved aerated biological filter tank according to a preferred embodiment of the utility model;

[0017] Figure 2 This is a schematic structural diagram of an enhanced denitrification improved aerated biological filter tank according to a preferred embodiment of the utility model;

[0018] Description of Figure Numbers:

[0019] 1. Water inlet area, 11. Water inlet distribution trough, 12. Water outlet pipe,

[0020] 2. Reaction zone, 21. Water distribution zone, 22. Filter plate layer, 23. Pebble support layer, 24. Ceramsite filter material layer, 25. Contact denitrification layer, 26. Aeration main pipe, 27. Aeration coil, 28. Aeration fan,

[0021] 3. Multifunctional water pool, 31. Resin supply pipe, 32. Resin discharge pipe, 33. Discharge main pipe, 34. Lifting pump, 35. Resin capture device, 36. Resin collection device,

[0022] 4. Backwash system, 41. Clean water outlet pipe,

[0023] 5. Water outlet area, 51. Backwash air pipe, 52. Backwash water pipe, 53. Backwash drain pipe, 54. Backwash aeration fan. DETAILED DESCRIPTION

[0024] For a better understanding of the present invention, the following embodiments are further explanations of the present invention, but the content of the present invention is not limited to the following embodiments.

[0025] like Figure 1 and Figure 2 As shown, an enhanced denitrification type improved aerated biological filter includes: an inlet area, a reaction area, a multifunctional water pool, a backwash system and an outlet area.

[0026] The water inlet area includes a water distribution trough and a water outlet pipe. The water distribution trough is located above the reaction area, and the bottom of the water distribution trough is connected to the lower end of the reaction area through the water outlet pipe. A water distribution area connected to the water outlet pipe is provided at the lower end of the reaction area. The filter plate layer, the pebble support layer, the ceramsite filter layer and the contact denitrification layer are arranged in sequence from bottom to top in the reaction area, and are all located above the water distribution area; and the top of the reaction area is connected to the water outlet area through the water outlet weir. The water in the water inlet area enters the water distribution area through the water outlet pipe, and then gradually undergoes filtration, adsorption, and reaction treatment by the filter plate layer, the pebble support layer, the ceramsite filter layer and the contact denitrification layer. The treated clean water flows to the water outlet weir. A clean water outlet pipe is provided at the bottom of the water outlet area. A part of the water flows through the clean water outlet pipe into the next treatment unit, and a part of the water flows into the multi-functional pool when backwashing is required.

[0027] At the same time, a saturated resin capture device is provided in the multifunctional water pool. The bottom of the multifunctional water pool is connected to the resin collection device and the lifting pump respectively through the discharge main pipe. The discharge end of the lifting pump is connected to the upper end of the reaction zone through the resin replenishing pipe, which is used to replenish the resin in the contact denitrification layer. The side wall corresponding to the reaction zone and the lower end of the contact denitrification layer is connected to the resin capture device through the resin discharge pipe. Resin filler is added to the multifunctional water pool and pumped into the contact denitrification layer through the lifting pump. The excess resin filler flows to the collection device through the discharge main pipe.

[0028] like Figure 1 and Figure 2 As shown, the backwash system includes a backwash air pipe, a backwash water pipe, a backwash drain pipe, and a backwash aeration fan. The backwash aeration fan is connected to the water distribution area through the backwash air pipe. One end of the backwash water pipe is connected to the discharge end of the lift pump, and the other end is connected to the water distribution area. The backwash drain pipe is connected to the reaction area and is located below the contact denitrification layer. A backwash air valve is provided on the backwash air pipe, a backwash water inlet valve is provided on the backwash water pipe, and a backwash drain valve is provided on the backwash drain pipe. When the enhanced denitrification type improved aerated biological filter needs to be backwashed, the device is backwashed by closing the control valve of the resin replenishment pipe, opening the control valve of the backwash pipe, and opening the control valve of the backwash air pipe.

[0029] Waterproof sleeves are reserved on both sides of the wall of the water distribution area at the bottom of the reaction area, which are connected to the water outlet pipe, backwash air pipe, and backwash pipe in sequence. In addition, a filter plate layer is set on the upper part of the water inlet distribution area, and multiple vertical filter beams are evenly arranged in between; the filter plate layer includes filter plates and long-handled filter heads, and the filter ends of the long-handled filter heads are evenly distributed above the filter plates, and the long-handled ends extend into the water distribution area; an aeration coil is set above the filter plate layer, and the aeration coil is connected to the aeration main pipe and the aeration fan in sequence, and the pebble support layer and the ceramsite filter material layer are covered above the aeration coil in sequence.

[0030] like Figure 2 As shown, the contact denitrification layer is located above the ceramsite filter layer, including two steel plates arranged opposite to each other and resin filled between the two steel plates. The two steel plates are provided with multiple micro-holes with a pore size not greater than 0.3 mm. The steel plates are made of SS304 stainless steel as a whole and are laser-perforated. The micro-holes should have the characteristics of small pore size, large number and uniform distribution. The resin filler filled in the contact denitrification layer is a macroporous anionic nitrate ion resin with a spherical particle appearance, a polystyrene copolymer skeleton, a quaternary amine functional group, a particle size range of 0.3-1.2 mm, and a total exchange capacity of 1000 mol / m 3 Chlorine type, water content is 52±3% chlorine type, loading density is 700-750g / l.

[0031] At the same time, the upper end of the reaction zone is connected to the discharge end of the lift pump through multiple resin replenishment pipes, and the upper end of the reaction zone is connected to the resin capture device through multiple resin discharge pipes. In this embodiment, the contact denitrification layer is connected to the resin replenishment pipe and the resin discharge pipe, and five of them are arranged horizontally and equidistantly; the resin replenishment pipe and the resin discharge pipe are provided with electric control valves. When the resin replenishment function is realized, the resin replenishment pipe control electric valve is opened and the resin discharge pipe electric control valve is closed; when the saturated resin discharge function is realized, the same applies.

[0032] The backwash water pipe and the resin replenishment pipe are set in parallel. When the backwash function is realized, the backwash water pipe control valve is opened and the resin replenishment pipe control valve is closed; when the resin filler replenishment function is realized, the reverse is true. Five backwash drainage pipes are set horizontally with equal spacing, respectively directly below the resin discharge pipe. The backwash discharge pipes finally merge into a main pipe and discharge to the pretreatment unit at the front end of the water treatment.

[0033] The water inlet of the multifunctional pool is connected to the clean water outlet pipe of the water outlet area. A saturated resin capture device is set on one side of the inner wall above the pool body. The saturated resin capture device is composed of an L-shaped perforated steel plate. The overall material is SS304 stainless steel, and laser holes are used. The hole diameter shall not be greater than 0.3mm. The micro holes should have the characteristics of small aperture, large number and uniform distribution, which are used to separate the discharged saturated resin from solid and liquid for further collection. The shape of the bottom of the pool body is an inverted cone, and a discharge main pipe is set at its lowest point. The discharge main pipe is connected to two branch pipes, one branch pipe is connected to the resin collection device, and one branch pipe is connected to the lifting pump. Electric control valves are set on each branch pipe. When the system needs to replenish resin, add the resin filler into the multi-functional water pool, start the lifting pump, open the electric control valve connected to the pump branch pipe, and close the branch pipe valve connected to the resin collection device; when the system needs backwashing, first open the branch pipe valve connected to the resin collection device, close the electric control valve connected to the pump branch pipe, and after draining the remaining resin, close the collection device branch pipe valve, open the electric valve connected to the pump branch pipe, and open the clean water outlet pipe branch valve.

[0034] Compared with the traditional aerated biological filter, the enhanced denitrification improved aerated biological filter has a more stable treatment effect and adopts replaceable macroporous anion nitrate ion resin filler, which is easy to replace and improves the operation efficiency. In view of the problem of difficult treatment of total nitrogen in deep water treatment, the traditional aerated biological filter needs to be further designed for total nitrogen. This device has good effects on the removal of total nitrogen, COD, BOD, and ammonia nitrogen. It is highly integrated and optimizes the process route.

[0035] The above is only a preferred implementation of the present utility model, which certainly cannot be used to limit the scope of rights of the present utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and changes can be made without departing from the principle of the present utility model, and these improvements and changes are also regarded as the protection scope of the present utility model.

Claims

1. An enhanced denitrification improved aerated biological filter, characterized in that: include: Inlet area, reaction area, multi-purpose pool, backwash system and outlet area; The water inlet area includes a water inlet distribution trough and a water outlet pipe. The water inlet distribution trough is located above the reaction area, and the bottom of the water inlet distribution trough is connected to the lower end of the reaction area through the water outlet pipe; the lower end of the reaction area is provided with a water distribution area connected to the water outlet pipe, and the reaction area is provided with a filter plate layer, a pebble support layer, a ceramsite filter material layer and a contact denitrification layer from bottom to top, and they are all located above the water distribution area; a saturated resin capture device is provided in the multifunctional water pool, and the bottom of the multifunctional water pool is respectively connected to the resin collection device and the lifting pump through the discharge main pipe, and the discharge end of the lifting pump is connected to the resin replenishment pipe through the resin replenishment pipe. The upper end of the reaction zone is connected to replenish resin into the contact denitrification layer, and the side walls corresponding to the lower ends of the reaction zone and the contact denitrification layer are connected to the resin capture device through a resin discharge pipe; the backwash system includes a backwash air pipe, a backwash water pipe, a backwash drainage pipe, and a backwash aeration fan, the backwash aeration fan is connected to the water distribution area through the backwash air pipe, one end of the backwash water pipe is connected to the discharge end of the lift pump, and the other end is connected to the water distribution area, the backwash drainage pipe is connected to the reaction zone and is located below the contact denitrification layer; the top of the reaction zone is connected to the water outlet area through a water outlet weir.

2. The enhanced denitrification improved aerated biological filter as claimed in claim 1, characterized in that: The filter plate layer includes a filter plate and a long-handled filter head. The filter plate is supported by multiple vertical filter beams and arranged in the reaction zone. The filter end of the long-handled filter head is above the filter plate, and the long-handled end extends into the water distribution zone.

3. The enhanced denitrification improved aerated biological filter as claimed in claim 1, characterized in that: An aeration coil is arranged between the filter plate layer and the pebble supporting layer, and the aeration coil is connected to the aeration fan through an aeration main pipe.

4. The enhanced denitrification improved aerated biological filter as claimed in claim 1, characterized in that: The contact denitrification layer includes two steel plates arranged opposite to each other up and down and a resin filled between the two steel plates. The two steel plates are provided with a plurality of micro holes with a pore size not greater than 0.3 mm.

5. The enhanced denitrification improved aerated biological filter as claimed in claim 1, characterized in that: The contact denitrification layer is filled with resin filler, which is a macroporous anionic nitrate ion resin. The appearance is spherical particles, the skeleton is a polystyrene copolymer, the functional group is a quaternary amine group, the particle size range is 0.3-1.2mm, and the total exchange capacity is 1000mol / m 3 Chlorine type, water content is 52±3% chlorine type, loading density is 700-750g / l.

6. The enhanced denitrification improved aerated biological filter as claimed in claim 1, characterized in that: The upper end of the reaction zone is connected to the discharge end of the lift pump through a plurality of resin replenishing pipes, and the upper end of the reaction zone is connected to the resin capturing device through a plurality of resin discharge pipes.

7. The enhanced denitrification improved aerated biological filter as claimed in claim 1, characterized in that: The bottom of the water outlet area is connected to the water inlet end of the multifunctional water pool through a purified water outlet pipe.

8. The enhanced denitrification improved aerated biological filter as claimed in claim 1, characterized in that: The bottom of the multifunctional pool is a structure that is wide at the top and narrow at the bottom.

9. The enhanced denitrification improved aerated biological filter as claimed in claim 1, characterized in that: The resin capture device is provided with a plurality of micro holes with a pore size no greater than 0.3 mm.

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