CN215288438U - Horizontal flow denitrification filter tank system - Google Patents
Horizontal flow denitrification filter tank system Download PDFInfo
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- CN215288438U CN215288438U CN202121458046.XU CN202121458046U CN215288438U CN 215288438 U CN215288438 U CN 215288438U CN 202121458046 U CN202121458046 U CN 202121458046U CN 215288438 U CN215288438 U CN 215288438U
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Abstract
The utility model discloses a horizontal flow denitrification filter system, which comprises a water inlet subsystem and a horizontal flow deep bed filter subsystem; the water inlet subsystem is used for realizing the uniform quantity and the uniform water distribution of external sewage, stirring and dissolving an external carbon source and a phosphorus removal medicament, and then conveying the primarily treated sewage to the horizontal flow deep bed filter subsystem through the first water outlet end; the horizontal flow deep bed filter subsystem comprises water inlet and outlet pipes and a plurality of filter units connected in parallel between the water inlet and outlet pipes, and the water flow direction in each filter unit is horizontal; each filter unit respectively comprises a filter filled with filter materials, a water distribution pipe fitting, and a water inlet interception net and a water outlet interception net which are respectively arranged close to the water inlet side and the water outlet side of the filter; the filter material is arranged between the water inlet interception net and the water outlet interception net and is suspended at the middle upper part in the filter tank. The utility model discloses simple structure adopts the gas back flush, can reduce the running cost.
Description
Technical Field
The utility model relates to a sewage treatment system technical field, concretely relates to horizontal flow denitrification filtering pond system.
Background
In recent years, with the emphasis on pollution control in countries and places, the discharge standard of sewage treatment is becoming more and more strict, and the effluent standard is improved to the surface IV-type water quality standard on the basis of GB18918-2002 in various places. Sewage plants implementing high emission standards need stricter control of organic matters, nitrogen and phosphorus, which requires the sewage plants to set advanced treatment processes in design construction or upgrading reconstruction. The denitrification deep bed filter integrates filtration and biochemical reaction, and can further remove Suspended Substances (SS) and Total Nitrogen (TN). Meanwhile, Total Phosphorus (TP) can be further removed by adding a phosphorus removal agent. Therefore, the denitrification deep-bed filter is more applied to the advanced treatment process of the sewage plant with high emission standard.
However, the existing denitrification deep bed filter tank adopts upward flow or downward flow, and in practical application, the problems that a filter tank bottom plate is easy to damage, a filter material is easy to harden, a water distribution device is easy to block, the content of Dissolved Oxygen (DO) in inlet water is high, the carbon source consumption is high and the like exist. In addition, the problems of large equipment investment, high energy consumption and the like exist due to the adoption of air-water combined backwashing. Therefore, research and development of efficient and economical denitrification processes become hot spots of current town sewage treatment.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's weak point, provide a horizontal flow denitrification filtering pond system to realize the efficient denitrification denitrogenation effect and reduce corresponding investment and running cost.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a horizontal flow denitrification filter system, which is characterized by comprising a water inlet subsystem and a horizontal flow deep bed filter subsystem;
the water inlet subsystem is provided with a first water inlet end and a first water outlet end and comprises a main water inlet pipe and a water inlet well which are sequentially communicated; external sewage enters the water inlet well through the main water inlet pipe and then enters the horizontal flow deep bed filter subsystem through the water inlet well; a stirrer is arranged in the water inlet well, and a carbon source and a phosphorus removing agent are added into the water inlet well;
the horizontal flow deep bed filter subsystem comprises a water inlet pipe, a water outlet pipe and a plurality of filter units connected in parallel between the water inlet pipe and the water outlet pipe, wherein the water inlet pipe is connected with the first water outlet end, and the water flow direction in each filter unit is horizontal; each filter unit respectively comprises a filter filled with filter materials and provided with a water inlet branch pipe and a water outlet branch pipe, a water distribution pipe connected with the water inlet branch pipe, and a water inlet interception net and a water outlet interception net which are arranged in the filter and are close to the water inlet branch pipe and the water outlet branch pipe respectively; the water inlet branch pipe and the water outlet branch pipe are respectively positioned on two tank walls of the filter tank arranged along the water flow direction, the water inlet branch pipe is positioned at the lower part of one tank wall of the filter tank and is connected with the water inlet pipe, and the water outlet branch pipe is positioned at the upper part of the other tank wall of the filter tank and is connected with the water outlet pipe; the filter material is arranged between the water inlet interception net and the water outlet interception net and suspended at the middle upper part in the filter tank.
Furthermore, a set of air backwashing unit is respectively arranged in each filter tank unit, and each set of air backwashing unit conveys backwashing wastewater to a wastewater collecting and conveying tank through a backwashing drainage pipe;
each air backwashing unit comprises a first vertical backwashing air pipe, a first backwashing air branch pipe, a first compressed air pipe, a second vertical backwashing air pipe and a second backwashing air branch pipe which are connected in sequence, and a backwashing water discharge branch pipe connected with the backwashing water discharge pipe; the first compressed air pipe and the second compressed air pipe in each air backwashing unit are simultaneously connected with a blower; the first vertical backwashing air pipe is arranged close to the wall of the filter tank provided with the water inlet branch pipe, the first backwashing air branch pipe is arranged at the bottom of the filter tank and is provided with a plurality of aeration discs, one end of the first backwashing air branch pipe is communicated with the first vertical backwashing air pipe, and the other end of the first backwashing air branch pipe is a closed end; the second vertical backwashing air pipe is arranged close to the wall of the filter tank provided with the water outlet branch pipe, the second backwashing air branch pipe is arranged at the bottom of the filter tank, one end of the second backwashing air branch pipe is communicated with the second vertical backwashing air pipe, and the other end of the second backwashing air branch pipe is a closed end; the back-flushing water discharge branch pipe is arranged at the bottom of the filter tank wall provided with the water outlet branch pipe.
The utility model discloses a characteristics and beneficial effect are:
(1) the horizontal flow denitrification deep bed filter body has simple structure and less equipment, does not need the installation of a filter plate, a filter head, a filter material supporting layer and the like of a conventional filter, and has no problem that the bottom plate of the conventional filter is easy to damage. The system occupies small area and is convenient for upgrading, reconstruction and extension of a sewage plant.
(2) The filter material which can suspend in the middle upper part of the deep bed filter tank body is adopted, so that the problems of blockage, filter material agglomeration, uneven water distribution and the like of the traditional up/down flow denitrification filter tank can be effectively solved.
(3) The gas back washing design is adopted, water back washing is not needed, the back washing gas quantity is reduced by 60 percent compared with the conventional gas washing dosage, the equipment investment is small, and the operation cost is low.
Drawings
Fig. 1 is a schematic cross-sectional view of a treatment system at a level of 0.90m according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view a-a of a processing system according to an embodiment of the present invention.
In the figure:
1 is the total water inlet pipe, 2 is the stirrer, 3 is 1#Filter cell unit, 4 is 2#Filter cell unit, 5 is 3#Filter cell unit, 6 is 4#The filter unit, 7 is a first vertical backwashing air pipe, 8 is a water inlet well, 9 is a vertical perforated water distribution branch pipe, 10 is a water inlet intercepting net, 11 is a water distribution pipe, 12 is a water collecting pit, 13 is a emptying pipe, 14 is a submersible sewage pump, 15 is a first pneumatic valve, 16 is a water inlet pipe, 17 is a water inlet branch pipe, 18 is a backwashing water discharge pipe, 19 is a water outlet intercepting net, 20 is a backwashing water discharge branch pipe, 21 is a second vertical backwashing air pipe, 22 is a fourth pneumatic valve, 23 is a manual valve, 24 is a second pneumatic valve, 25 is a third pneumatic valve, 26 is a filter material, 27 is an overflow weir, 28 is a space, 29 is a water outlet branch pipe, 30 is a fifth pneumatic valve, 31 is a water outlet pipe, 32 is an aeration disc, 33 is a first backwashing air branch pipe, 34 is a second backwashing air branch pipe, 35 is a water blocking platform, 36 is a blower, 37 is a wastewater collection conveying pool, 38 is a first compressed air pipe, 39 is a second compressed air pipe, and 06 is a 4# filter tank.
Detailed Description
The utility model provides a water treatment system of a horizontal flow denitrification deep bed filter tank, the following detailed description with the attached drawings and the specific embodiment is as follows:
referring to fig. 1 and fig. 2, the horizontal flow denitrification filter system provided by the present invention comprises a water inlet subsystem and a horizontal flow deep bed filter subsystem which are sequentially connected; the water inlet subsystem is provided with a first water inlet end and a first water outlet end, and the horizontal flow deep bed filter subsystem is provided with a water inlet pipe and a water outlet pipe. The system comprises a water inlet subsystem, a horizontal flow deep bed filter subsystem, a water outlet subsystem, a water inlet subsystem and a water outlet subsystem, wherein external sewage enters the water inlet subsystem through a first water inlet end so as to realize uniform quantity and uniform water distribution of the external sewage in the water inlet subsystem, an external carbon source and a phosphorus removal agent are stirred and dissolved, and then the sewage after primary treatment is conveyed to the horizontal flow deep bed filter subsystem through a first water outlet end; the water inlet pipe of the horizontal flow deep bed filter subsystem is communicated with the first water outlet end of the water inlet subsystem, the water flow direction in the horizontal flow deep bed filter subsystem is horizontal, SS and TP are removed after sewage is subjected to micro-flocculation in the horizontal flow deep bed filter subsystem through an external carbon source and a phosphorus removal medicament, pollutants such as organic matters, nitrate nitrogen and the like are degraded by a microbial film formed in the horizontal flow deep bed filter subsystem, the synchronous removal effect of TN, TP and SS is finally realized, the quality of effluent water is improved, and finally the effluent water is discharged to a subsequent water treatment process unit through the water outlet pipe of the horizontal flow deep bed filter subsystem.
The concrete realization and function of each component part in the water treatment system of the utility model are described below:
and the water inlet subsystem comprises a main water inlet pipe 1 and a water inlet well 8 which are sequentially communicated. External sewage enters the water inlet well 8 through the main water inlet pipe 1 and then enters the horizontal flow deep bed filter subsystem through the water inlet well 8. The water inlet well 8 is internally provided with a stirrer 2, a carbon source and a phosphorus removing agent can be added into the water inlet well 8 according to the actual water quality condition, and the dissolution and the mixing of the carbon source and the phosphorus removing agent are accelerated under the action of the stirrer 2, so that TN, TP and SS can be effectively removed in the horizontal flow deep bed filter subsystem.
The horizontal flow deep bed filter subsystem comprises a water inlet pipe 16, a water outlet pipe 31 and a plurality of (usually 4-8) filter units which are divided according to the size of water treatment scale and are connected in parallel between the water inlet pipe 16 and the water outlet pipe 31, wherein the volumes of the filter units are equal, the filter units have the same structure and function, the water inlet pipe 16 is connected with a first water outlet end of the water inlet subsystem, the water flow direction in each filter unit is horizontal, and the horizontal filtering speed is 25-30 m/h. In the present embodiment, 4 filter units are provided, namely 1# -4 # filter units 3-6, and the 4# filter unit 6 is taken as an example for explanation. The 4# filter unit 6 comprises a 4# filter tank 06 filled with filter material 26 and provided with a water inlet branch pipe 17 and a water outlet branch pipe 29, a water distribution pipe connected with the water inlet branch pipe 17, and a water inlet interception net 10 and a water outlet interception net 19 which are respectively arranged inside the 4# filter tank 06 and close to the water inlet branch pipe 17 and the water outlet branch pipe 29. The length direction of the filter is parallel to the water flow direction, the width direction of the filter is perpendicular to the water flow direction, a water inlet branch pipe 17 and a water outlet branch pipe 29 of the filter are respectively positioned on two walls of the filter arranged along the length direction, the water inlet branch pipe 17 of the filter is positioned at the lower part of one wall of the filter (the wall is simply referred to as the water inlet side of the filter), and the water outlet branch pipe 29 of the filter is positioned at the upper part of the other wall of the filter (the wall is simply referred to as the water outlet side of the filter). Wherein:
the water distribution pipe is positioned at the water inlet side of the No. 4 filter tank 06 and comprises a water distribution pipe 11 and a vertical perforated water distribution branch pipe 9 which are communicated in sequence. One end (the part positioned outside the water inlet side of the 4# filter tank 06) of the water inlet branch pipe 17 positioned at the water inlet side of the 4# filter tank 06 is vertically connected with the water inlet pipe 16, and the other end (the part positioned inside the 4# filter tank 06) of the water inlet branch pipe is vertically connected with the water distribution pipe 11; the water inlet branch pipe 17 is provided with a first pneumatic valve 15 for controlling the opening and closing of the water inlet branch pipe 17. The water distribution pipe 11 is arranged at the bottom of the No. 4 filter tank 06, and the water distribution pipe 11 is arranged along the width direction of the No. 4 filter tank 06. The vertical perforated water distribution branch pipe 9 is arranged along the height direction of the 4# filtering tank 06, the bottom end of the vertical perforated water distribution branch pipe 9 is connected with the water distribution pipe 11, and holes (with the hole diameter of phi 100) are formed on the vertical perforated water distribution branch pipe 9 every 0.5m along the height direction of the 4# filtering tank 06 so as to ensure 4#The water in the filter 06 is distributed evenly.
A water inlet interception net 10 and a water outlet interception net 19 are respectively arranged in the 4# filter tank 06 and close to the water inlet side and the water outlet side of the 4# filter tank 06, the width of the water inlet interception net 10 and the width of the water outlet interception net 19 are equal to the width of the 4# filter tank 06, and the height of the water inlet interception net 10 and the height of the water outlet interception net 19 are equal to the height of the 4# filter tank 06. The filter material 26 is arranged between the water inlet interception net 10 and the water outlet interception net 19 and is suspended at the middle upper part in the No. 4 filter 06, so that the problems of blockage, filter material agglomeration, uneven water distribution and the like of the traditional up/down flow denitrification filter can be effectively avoided. The filter media 26 primarily functions to filter, adsorb, and biologically oxidize contaminants. The water inlet interception net 10 and the water outlet interception net 19 can avoid the loss of the filter material 26, and the filter material 26 in the No. 4 filter tank 06 is limited in the space between the water inlet interception net 10 and the water outlet interception net 19.
Further, in order to enable sewage at the bottom of the 4# filter tank 06 to be in full contact with the filter material 26 suspended at the middle upper part of the 4# filter tank 06 and effectively remove pollutants in the sewage at the lower part, a water blocking platform 35 is arranged on the tank wall at a position which is at a distance from the tank bottom 1/3 (in the embodiment, the tank height of 1/3 is set to be 2-2.5 m) at the water outlet side of the 4# filter tank 06, one end of the water blocking platform 35 is fixedly connected with the tank wall at the water outlet side of the 4# filter tank, the other end of the water blocking platform 35 is a free end and is arranged close to the water outlet intercepting net 19 (in the embodiment, the length of the water blocking platform 35 is set to be 1-1.2 m), the width of the water blocking platform 35 is equal to that of the 4# filter tank 06, and the bottom of the filter material 26 is flush with the top of the water blocking platform 35. Referring to the direction shown by the arrow in fig. 2, after sewage enters the 4# filter tank 06 through the vertical perforated water distribution branch pipe 9, then flows through the water inlet intercepting net 10 in the 4# filter tank 06 to the water outlet side direction of the 4# filter tank 06, wherein the sewage at the lower part of the 4# filter tank 06 continues to flow towards the water outlet side tank wall direction of the 4# filter tank 06 after passing through the water outlet intercepting net 19, and then flows from bottom to top along the water outlet side tank wall of the 4# filter tank 06, until reaching the bottom of the water blocking platform 35 and flowing along the direction (the direction from right to left in fig. 2) away from the water outlet side tank wall of the 4# filter tank 06, and enters the water intercepting net 19 again and contacts with the filter material 26.
Furthermore, in order to effectively control the elevation of the water level in the 4# filter tank 06 and the distribution of water flow and improve the pollutant removal effect, an overflow weir 27 is fixedly arranged on the upper part of the tank wall on the water outlet side of the 4# filter tank 06, the overflow weir 27 is in an L shape, the horizontal section of the overflow weir 27 is parallel to the water blocking platform 35 and is equal to the length of the water blocking platform 35, the distance from the bottom of the horizontal section of the overflow weir 27 to the top of the 4# filter tank 06 is 1/5 tank height, the vertical section of the overflow weir 27 is close to the water outlet interception net 19, the height of the vertical section of the overflow weir 27 is 1-1.2 m, the top end of the vertical section of the overflow weir 27 is higher than the upper plane of the filter material 26, and the water outlet branch pipe 29 of the 4# filter tank 06 is arranged in a space 28 formed by the corresponding tank walls of the overflow weir 27 and the 4# filter tank 06. The sewage enters the No. 4 filter tank 06 through the vertical perforated water distribution branch pipe 9 and then flows towards the water outlet side of the No. 4 filter tank 06 through the water inlet interception net 10 in the No. 4 filter tank 06. The sewage in the No. 4 filter tank 06 is filtered, adsorbed and biologically oxidized by the filter material 26, passes through the water outlet interception net 19, then overflows into the space 28 enclosed by the overflow weir 27 and the water outlet side tank wall of the No. 4 filter tank 06 along the top of the vertical section of the overflow weir 27 under the flow guiding action of the vertical section of the overflow weir 27, finally flows into the water outlet pipe 31 from the water outlet branch pipe 29, the water outlet pipe 31 is provided with the fifth pneumatic valve 30, and the sewage enters the subsequent water treatment process unit of the sewage plant through the water outlet pipe 31 so as to realize the standard discharge of the outlet water.
Furthermore, in order to ensure a stable and efficient water treatment effect, each filter unit (mainly aiming at filter materials in the filter units) in the horizontal flow deep bed filter subsystem needs to be backwashed one by one at regular intervals, and the backwashing operation of a certain filter unit does not influence the normal water treatment operation of other filter units. A set of air backwashing units is respectively arranged in each filter unit, each set of air backwashing unit conveys the backwashing wastewater to a wastewater collecting and conveying tank 37 through a backwashing water discharge pipe 18, and the air backwashing unit in the No. 4 filter unit 6 is taken as an example for explanation. The air backwashing unit comprises a first vertical backwashing air pipe 7 and a first backwashing air branch pipe 33 which are close to the water inlet side pool wall of the 4# filter pool 06 and are communicated with each other, a second vertical backwashing air pipe 21 and a second backwashing air branch pipe 34 which are close to the water outlet side pool wall of the 4# filter pool 06 and are communicated with each other, and a backwashing wastewater discharge branch pipe 20 which is arranged at the bottom of the water outlet side pool wall of the 4# filter pool 06. The first vertical backwashing air pipe 7 is arranged along the height direction of the 4# filtering pool 06, the top end of the first vertical backwashing air pipe 7 is connected with the first compressed air pipe 38, the second pneumatic valve 24 for controlling the opening and closing of the first vertical backwashing air pipe 7 is arranged, the bottom end of the first vertical backwashing air pipe 7 is connected with one end of a first backwashing air branch pipe 33, the other end of the first backwashing air branch pipe 33 is a closed end, the first backwashing air branch pipe 33 is arranged at the bottom of the 4# filtering pool 06 and is arranged along the water flow direction, and aeration discs 32 are arranged on the first backwashing air branch pipe 33 at intervals. The second vertical backwashing air pipe 21 is arranged along the height direction of the 4# filtering pool 06, the top end of the second vertical backwashing air pipe 21 is connected with the second air compression pipe 39 and is provided with a third pneumatic valve 25 for controlling the opening and closing of the second vertical backwashing air pipe 21, the bottom end of the second vertical backwashing air pipe 21 is connected with one end of a second backwashing air branch pipe 34, the periphery of the second backwashing air branch pipe 34 is provided with holes, the other end of the second backwashing air branch pipe is a closed end, and the second backwashing air branch pipe 34 is arranged at the bottom of the 4# filtering pool 06 and is arranged along the water flow direction. The first compressed air pipe 38 and the second compressed air pipe 39 are connected to a blower 36 (one blower is shared by the air backwash units in each filter unit) for introducing compressed air into the first vertical backwash air pipe 7, the first backwash air branch pipe 33, the second vertical backwash air pipe 21 and the second backwash air branch pipe 34. The back washing wastewater discharge branch pipe 20 is provided with a fourth pneumatic valve 22 for controlling the back washing wastewater discharge branch pipe 20 to open and close, the back washing wastewater discharge branch pipe of each filter unit is communicated with a back washing water discharge pipe 18 provided with a manual valve 23 in a normally open state, and the back washing wastewater in each back washing wastewater discharge branch pipe is discharged out of the corresponding filter to a wastewater collection and conveying tank 37 through the back washing water discharge pipe 18. When the quality of inlet water is poor, the pollution of each filter unit is serious, and the quantity of backwash water needs to be increased, in order to avoid that the instantaneous water quantity of the backwash water discharge pipe 18 is too large to influence the stability of the backwash wastewater collection and delivery tank 37, the manual valve 23 on the backwash water discharge pipe 18 can be properly adjusted.
Backwashing process and time: adopting gas back washing, and timely adjusting the back washing period and the back washing strength according to the water quality of inlet and outlet water, wherein the back washing period is 5-7 d, and the back washing strength is 18-25 m3/m2H. During backwashing, the first pneumatic valve 15 on the water inlet branch pipe 17 is closed, the blower 36 is started, the second pneumatic valve 24 on the first vertical backwashing air pipe 7 and the third pneumatic valve 25 on the second vertical backwashing air pipe 21 are opened, and air-washing backwashing is started. And (3) adjusting the backwashing duration timely according to the water quality of inlet and outlet water, after backwashing for 8-15 min, closing the air blower, the second pneumatic valve 24 and the third pneumatic valve 25, opening the fourth pneumatic valve 22 on the backwashing drainage branch pipe 20, and allowing sewage and sludge in the filter unit to enter a front end biochemical treatment system of a sewage treatment plant through a backwashing wastewater discharge system. After the water is completely discharged, the fourth pneumatic valve 22 is closed, the first pneumatic valve 15 is opened, and the filter unit starts normal water treatment operation. Besides the degassing and backwashing operation, the blower 36 and the first vertical reverse pump can be started according to the water qualityThe flushing air pipe pneumatic valve 24 increases Dissolved Oxygen (DO) of the horizontal deep bed filter system through the action of the aeration disc 32, and further improves the removal rate of ammonia nitrogen and COD.
Furthermore, four corners of the horizontal flow denitrification deep bed filter water treatment system are respectively provided with 1 water collecting pit 12, and a submersible sewage pump 14 is arranged in each pit. Before the system is overhauled, sewage in the horizontal flow deep bed filter system can enter an emptying pipe 13 through a submersible sewage pump 14 and then is discharged into a sewage well in a plant area.
Example (b):
a certain sewage treatment plant with a design scale of 5 ten thousand meters3And d, adopting an improved five-section Bardenpho, an efficient sedimentation tank, a horizontal flow denitrification deep bed filter and chlorine dioxide for disinfection in the sewage treatment process. The water quality of inlet water of the horizontal flow denitrification deep bed filter process unit is TN less than or equal to 20mg/L, TP less than or equal to 0.5mg/L, COD less than or equal to 50mg/L and SS less than or equal to 20mg/L), the water quality of outlet water of the horizontal flow denitrification deep bed filter process unit is TN less than or equal to 10mg/L, TP less than or equal to 0.3mg/L, COD less than or equal to 35mg/L and SS less than or equal to 5 mg/L.
Through plus carbon source and dephosphorization medicament, the utility model discloses all have better treatment effect to COD, SS, TN, TP, compare with the deep bed filtering pond of internal denitrification, all have obvious technical advantage in the aspect of filter material life, energy consumption and backwash water quantity.
While examples of the present system have been shown and described above, it is understood that the above examples are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations of the above examples may be made by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (9)
1. A horizontal flow denitrification filter system is characterized by comprising a water inlet subsystem and a horizontal flow deep bed filter subsystem;
the water inlet subsystem is provided with a first water inlet end and a first water outlet end and comprises a main water inlet pipe and a water inlet well which are sequentially communicated; external sewage enters the water inlet well through the main water inlet pipe and then enters the horizontal flow deep bed filter subsystem through the water inlet well; a stirrer is arranged in the water inlet well, and a carbon source and a phosphorus removing agent are added into the water inlet well;
the horizontal flow deep bed filter subsystem comprises a water inlet pipe, a water outlet pipe and a plurality of filter units connected in parallel between the water inlet pipe and the water outlet pipe, wherein the water inlet pipe is connected with the first water outlet end, and the water flow direction in each filter unit is horizontal; each filter unit respectively comprises a filter filled with filter materials and provided with a water inlet branch pipe and a water outlet branch pipe, a water distribution pipe connected with the water inlet branch pipe, and a water inlet interception net and a water outlet interception net which are arranged in the filter and are close to the water inlet branch pipe and the water outlet branch pipe respectively; the water inlet branch pipe and the water outlet branch pipe are respectively positioned on two tank walls of the filter tank arranged along the water flow direction, the water inlet branch pipe is positioned at the lower part of one tank wall of the filter tank and is connected with the water inlet pipe, and the water outlet branch pipe is positioned at the upper part of the other tank wall of the filter tank and is connected with the water outlet pipe; the filter material is arranged between the water inlet interception net and the water outlet interception net and suspended at the middle upper part in the filter tank.
2. The system of claim 1, wherein the water distribution pipe unit comprises a water distribution pipe and a vertical perforated water distribution branch pipe which are communicated with each other in sequence; the water distribution pipe is arranged at the bottom of the filter tank and is connected with the water inlet branch pipe; the bottom end of the vertical perforated water distribution branch pipe is connected with the water distribution pipe.
3. The horizontal flow denitrification filter system of claim 1, wherein the overall height of the filter media is 2/3 the height of the filter.
4. The horizontal flow denitrification filter system according to claim 1, wherein a water blocking platform is arranged on the lower wall of the filter provided with the water outlet branch pipe in the filter unit; one end of the water blocking platform is fixedly connected with the side wall of the filter tank, and the other end of the water blocking platform is a free end and is arranged close to the water outlet interception net.
5. The horizontal flow denitrification filter system according to claim 4, wherein in the filter unit, an overflow weir is arranged on the upper wall of the filter provided with the water outlet branch pipe; the overflow weir is L-shaped, and the water outlet branch pipe is arranged in a space enclosed by the overflow weir and the wall of the filter tank in the corresponding area; the vertical section of the overflow weir is arranged close to the water outlet interception net, and the top end of the vertical section of the overflow weir is higher than the upper plane of the filter material.
6. The horizontal flow denitrification filter system according to claim 5, wherein the water-blocking platform has a width equal to the width of the filter, and the top of the water-blocking platform is flush with the bottom of the filter material; and the horizontal section of the overflow weir is parallel to the water blocking platform and has the same length as the water blocking platform.
7. The horizontal flow denitrification filter system according to claim 6, wherein the distance from the water-blocking platform to the bottom of the filter is 1/3, and the length of the water-blocking platform is 1-1.2 m; the distance from the bottom of the horizontal section of the overflow weir to the top of the filter pool is 1/5 pool height, and the height of the vertical section of the overflow weir is 1-1.2 m.
8. The horizontal flow denitrification filter system according to any one of claims 2-7, wherein each filter unit is provided with a set of air backwashing units, and each set of air backwashing units conveys backwashing wastewater to a wastewater collection and conveying tank through a backwashing drainage pipe;
each air backwashing unit comprises a first vertical backwashing air pipe, a first backwashing air branch pipe, a first compressed air pipe, a second vertical backwashing air pipe and a second backwashing air branch pipe which are connected in sequence, and a backwashing water discharge branch pipe connected with the backwashing water discharge pipe; the first compressed air pipe and the second compressed air pipe in each air backwashing unit are simultaneously connected with a blower; the first vertical backwashing air pipe is arranged close to the wall of the filter tank provided with the water inlet branch pipe, the first backwashing air branch pipe is arranged at the bottom of the filter tank and is provided with a plurality of aeration discs, one end of the first backwashing air branch pipe is communicated with the first vertical backwashing air pipe, and the other end of the first backwashing air branch pipe is a closed end; the second vertical backwashing air pipe is arranged close to the wall of the filter tank provided with the water outlet branch pipe, the second backwashing air branch pipe is arranged at the bottom of the filter tank, one end of the second backwashing air branch pipe is communicated with the second vertical backwashing air pipe, and the other end of the second backwashing air branch pipe is a closed end; the back-flushing water discharge branch pipe is arranged at the bottom of the filter tank wall provided with the water outlet branch pipe.
9. The system of claim 8, wherein four corners of the system are provided with sumps, and each sump is provided with a submersible sewage pump, and each submersible sewage pump is connected with a drain pipe.
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| CN202121458046.XU CN215288438U (en) | 2021-06-29 | 2021-06-29 | Horizontal flow denitrification filter tank system |
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| CN202121458046.XU CN215288438U (en) | 2021-06-29 | 2021-06-29 | Horizontal flow denitrification filter tank system |
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2021
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