CN216890263U - Device for synchronously removing ammonia nitrogen, iron and manganese in water through two-way flow water inlet catalytic oxidation - Google Patents
Device for synchronously removing ammonia nitrogen, iron and manganese in water through two-way flow water inlet catalytic oxidation Download PDFInfo
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Abstract
The utility model discloses a device for synchronously removing ammonia nitrogen, iron and manganese in water by two-way flow water inlet catalytic oxidation, which comprises a two-way flow water inlet catalytic oxidation filter column, wherein an upper water distribution area, an upper filter material layer and an upper support layer are sequentially arranged in a column shell between a top plate and an upper support plate from top to bottom; the water distribution device is characterized in that a lower water distribution area is arranged in the column shell between the bottom plate and the lower supporting plate, and a lower bearing layer, a lower filter material layer and a middle layer water collection area are sequentially arranged in the column shell between the lower supporting plate and the upper supporting plate from bottom to top. The device adopts bidirectional flow water inlet, the middle layer collects water and discharges water, the water treatment amount in unit time is large, and under the condition of not needing external equipment to supply oxygen additionally, each stage of filter layer can fully utilize dissolved oxygen carried in the inlet water, exert catalytic oxidation capability and synchronously catalyze, oxidize and efficiently remove ammonia nitrogen, iron and manganese in the water.
Description
Technical Field
The utility model belongs to the technical field of drinking water treatment, relates to removal of ammonia nitrogen, iron and manganese in water, and particularly relates to a device for synchronously removing ammonia nitrogen, iron and manganese in water through bidirectional flow water inlet catalytic oxidation.
Background
The ammonia nitrogen can indicate possible contamination of bacteria, animal waste and the like in water. In different types of surface water sources, whether rivers, lakes or reservoir water bodies, ammonia nitrogen becomes one of the main pollutants.
The method for synchronously removing ammonia nitrogen, iron and manganese in the water source mainly comprises two methods: contact catalytic oxidation and biological oxidation. In the contact catalytic oxidation process, ammonia nitrogen is removed by oxidizing the wastewater into nitrite nitrogen, oxidizing the nitrite nitrogen into nitrate nitrogen, and removing the generated nitrate nitrogen from the surface of the filter material, namely the catalytic oxidation process of the composite oxide film on the surface of the filter material on the ammonia nitrogen; what dominates the iron removal is the autocatalytic effect of the active oxide film; the demanganization process is divided into two stages: manganese ions in raw water are firstly adsorbed on the active oxidation film, then are oxidized through the catalytic action of manganese oxide, one part is removed, the other part is converted into a new active oxidation film component, and the autocatalysis process is realized, and the processes are shown as a formula (1) and a formula (2).
MnO2·xH2O+Mn2+＝MnO2·MnO·(x－1)H2O+2H+Formula (1);
MnO2·MnO·(x－1)H2O+1/2O2+H2O＝2MnO2·xH2o formula (2);
in the process of synchronously removing ammonia nitrogen, iron and manganese by contact catalytic oxidation, Dissolved Oxygen (DO) is a main limiting factor. In the traditional contact catalytic oxidation filter column, the dissolved oxygen of 0-40 cm in front of the filter layer is consumed rapidly, as shown in fig. 4(a), the lower layer in the filter column does not have sufficient dissolved oxygen, so that the middle part and the lower part of a catalytic oxidation system can not provide sufficient dissolved oxygen for catalytic oxidation reaction, the utilization rate of the lower layer in the filter layer is reduced, and the removal effect of ammonia nitrogen, iron and manganese is reduced.
The DO concentration required for oxidizing ammonia nitrogen, iron and manganese can be calculated according to the electron gain and loss of the oxidation reduction reaction: theoretically 1mg/L NH4 +Oxidation of-N to NO3 -N consumes 4.57mg/L of dissolved oxygen, oxidizes 1mg/L of Mn2+Consuming 0.29mg/L of dissolved oxygen and oxidizing 1mg/L of Fe2+0.14mg/L of dissolved oxygen is consumed.
O2＝4.57NH4 +-N+0.29Mn2++0.14Fe2+Formula (3);
from the theoretical calculation formula (2), the dissolved oxygen concentration is the main limiting factor of the catalytic oxidation process of the filter layer contact. The concentration range of dissolved oxygen of the inlet water of the drinking water is generally 6.0-10.0 mg/L, so when the concentration of ammonia nitrogen, iron and manganese in the inlet water is higher, the dissolved oxygen in the filter layer is insufficient, the utilization rate of the filter layer is insufficient, the catalytic oxidation process is incomplete, the ammonia nitrogen, iron and manganese in the outlet water do not reach the standard, and the lower catalytic oxidation filter material does not fully play a role.
In the prior art, an aeration device is additionally arranged at the middle lower part of a filter layer for reverse flow oxygenation, so that sufficient dissolved oxygen in the filter layer is ensured to be used in a catalytic oxidation process, but additional oxygenation equipment is added, so that the water treatment cost and the equipment complexity are improved, the advantages are obvious only for high-concentration ammonia nitrogen raw water, the advantages are not obvious for 1.0-3.0mg/L ammonia nitrogen raw water, and the treated water amount in unit time is limited. How to ensure the economical and efficient removal of ammonia nitrogen, iron and manganese in a drinking water source, no additional oxygen supplementation is needed, the cost in the catalytic oxidation process is reduced, and the water treatment efficiency is improved becomes one of the difficult problems in the drinking water treatment field.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model aims to provide a device for synchronously removing ammonia nitrogen, iron and manganese in water by catalytic oxidation of bidirectional-flow inflow water, so as to solve the technical problems of complex filter tank structure, increased water treatment cost and insufficient water treatment amount caused by the fact that oxygenation equipment is additionally arranged in equipment in the prior art.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a device for synchronously removing ammonia nitrogen, iron and manganese in water by two-way flow water inlet catalytic oxidation comprises a two-way flow water inlet catalytic oxidation filter column, wherein the two-way flow water inlet catalytic oxidation filter column comprises a column shell, the top end of the column shell is provided with a top plate, the bottom end of the column shell is provided with a bottom plate, an upper supporting plate and a lower supporting plate are arranged in the column shell, and a water distribution gas distributor is respectively arranged on the upper supporting plate and the lower supporting plate;
an upper water distribution area, an upper filter material layer and an upper supporting layer are sequentially arranged in the column shell between the top plate and the upper supporting plate from top to bottom; a lower water distribution area is arranged in the column shell between the bottom plate and the lower supporting plate, and a lower bearing layer, a lower filter material layer and a middle layer water collection area are sequentially arranged in the column shell between the lower supporting plate and the upper supporting plate from bottom to top;
the water distribution device also comprises a raw water tank, wherein the raw water tank is connected with one end of a water inlet main pipe with a water inlet pump, the other end of the water inlet main pipe is respectively connected with one end of an upper water inlet pipe and one end of a lower water inlet pipe, the other end of the upper water inlet pipe is connected with an upper water distribution area through a water distributor, and the other end of the lower water inlet pipe is connected with a lower water distribution area;
the water-saving device also comprises a middle-layer water supply and drainage unit arranged in the middle-layer water collection area, and the middle-layer water supply and drainage unit is connected with a drainage pipe with a filtered water outlet valve.
The utility model also has the following technical characteristics:
the middle-layer water supply and drainage unit comprises a pair of water collecting main pipes, and a plurality of perforated water collecting pipes are arranged between the pair of water collecting main pipes; the water collecting main pipe is connected with the water discharging pipe.
And a water inlet main valve and a check valve are also arranged on the water inlet main pipe at the downstream of the water inlet pump.
The upper water inlet pipe is also provided with an upper water inlet flowmeter and an upper water inlet valve; the lower water inlet pipe is also provided with a lower water inlet flow meter and a lower water inlet valve.
The water distribution device also comprises a backwashing water tank, the backwashing water tank is connected with one end of a backwashing water inlet main pipe with a backwashing water pump, the other end of the backwashing water inlet main pipe is respectively connected with one end of an upper backwashing water inlet pipe and one end of a lower backwashing water inlet pipe, the other end of the upper backwashing water inlet pipe is connected with a middle-layer water supply and drainage unit, and the other end of the lower backwashing water inlet pipe is connected with a lower water distribution area; the upper part of the upper water distribution area is connected with a back washing water outlet pipe with a back washing water outlet valve at a position close to the top plate.
And the upper backwashing water inlet pipe and the lower backwashing water inlet pipe are also connected with an air compressor with an air inlet valve.
The upper back-flushing water inlet pipe is also provided with an upper back-flushing flow meter and an upper back-flushing water inlet valve; the lower back-washing water inlet pipe is also provided with a lower back-washing flow meter and a lower back-washing water inlet valve.
And the upper filter material layer, the lower filter material layer, the upper water inlet pipe, the lower water inlet pipe, the upper backwashing water inlet pipe and the lower backwashing water inlet pipe are respectively provided with a pressure gauge.
And the lower water distribution area is also connected with an emptying pipe with an emptying valve.
Compared with the prior art, the utility model has the following technical effects:
the device adopts bidirectional flow water inlet and middle layer water collecting and water outlet, the water treatment amount in unit time is large, and under the condition of no need of external equipment for additional oxygen supply, each stage of filter layer can fully utilize dissolved oxygen carried in the inlet water, exert catalytic oxidation capability, and synchronously catalyze, oxidize and efficiently remove ammonia nitrogen, iron and manganese in the water.
The device of the utility model adopts a mode of bidirectional inflow at the upper end and the lower end and water collection and outflow at the middle layer, reduces the thickness of the filter layer, increases the hydraulic load and does not need external oxygenation equipment.
(III) the device has simple structure, reduces energy consumption, reduces the operation cost, is environment-friendly and has no secondary pollution.
Drawings
FIG. 1 is a schematic structural diagram of a device for synchronously removing ammonia nitrogen, iron and manganese in water by catalytic oxidation of bidirectional inflow water.
Fig. 2 is a schematic structural diagram of the middle-layer water supply and drainage unit.
FIG. 3 is a schematic diagram of a process for simultaneous removal of ammonia nitrogen, iron and manganese from water by catalytic oxidation with bi-directional inflow.
FIG. 4(a) is a graph showing the change rule of ammonia nitrogen and dissolved oxygen along the layers of the unidirectional flow catalytic oxidation filter column.
FIG. 4(b) is a graph showing the change rule of ammonia nitrogen and dissolved oxygen along the upper layer of the two-way flow catalytic oxidation filter column.
FIG. 4(c) is a graph showing the change rule of ammonia nitrogen and dissolved oxygen along the lower layer of the two-way flow catalytic oxidation filter column.
FIG. 5(a) is a diagram showing the effect of a two-way inflow catalytic oxidation filter column on ammonia nitrogen removal.
FIG. 5(b) is a graph showing the effect of a two-way flow influent catalytic oxidation filter on iron removal.
FIG. 5(c) is a graph showing the effect of a bi-directional influent catalytic oxidation filter on manganese removal.
The meaning of the individual reference symbols in the figures is: 1-a bidirectional flow water inlet catalytic oxidation filter column, 2-a raw water tank, 3-a water inlet main pipe, 4-a water inlet pump, 5-an upper water inlet pipe, 6-a lower water inlet pipe, 7-a water distributor, 8-a middle layer water supply and drainage unit, 9-a water discharge pipe, 10-a post-filtration water outlet valve, 11-a water inlet main valve, 12-a check valve, 13-an upper water inlet flowmeter, 14-an upper water inlet valve, 15-a lower water inlet flowmeter, 16-a lower water inlet valve, 17-a backwashing water tank, 18-a backwashing water inlet main pipe, 19-a backwashing water pump, 20-an upper backwashing water inlet pipe, 21-a lower backwashing water inlet pipe, 22-a backwashing water outlet pipe, 23-a backwashing water outlet valve, 24-an air compressor, 25-an air inlet valve and 26-an upper backwashing flowmeter, 27-upper back washing water inlet valve, 28-lower back washing flow meter, 29-lower back washing water inlet valve, 30-pressure meter, 31-vent pipe and 32-vent valve.
101-column shell, 102-top plate, 103-bottom plate, 104-upper supporting plate, 105-lower supporting plate, 106-water and gas distributor, 107-upper water distribution area, 108-upper filter material layer, 109-upper supporting layer, 110-lower water distribution area, 111-lower supporting layer, 112-lower filter material layer and 113-middle layer water collection area.
801-dry pipe, 802-perforated collector pipe.
The present invention will be explained in further detail with reference to examples.
Detailed Description
It is to be noted that all components in the present invention, unless otherwise specified, are all those known in the art.
The present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention fall within the protection scope of the present invention.
Example 1:
the embodiment provides a device for synchronously removing ammonia nitrogen, iron and manganese in water through catalytic oxidation by bidirectional flow water inflow, as shown in fig. 1 and fig. 2, the device comprises a bidirectional flow water inflow catalytic oxidation filter column 1, the bidirectional flow water inflow catalytic oxidation filter column 1 comprises a column shell 101, a top plate 102 is arranged at the top end of the column shell 101, a bottom plate 103 is arranged at the bottom end of the column shell 101, an upper supporting plate 104 and a lower supporting plate 105 are arranged in the column shell 101, and a water distribution and gas distribution device 106 is respectively arranged on the upper supporting plate 104 and the lower supporting plate 105;
an upper water distribution area 107, an upper filter material layer 108 and an upper supporting layer 109 are sequentially arranged in the column shell 101 between the top plate 102 and the upper supporting plate 104 from top to bottom; a lower water distribution area 110 is arranged in the column shell 101 between the bottom plate 103 and the lower supporting plate 105, and a lower supporting layer 111, a lower filter material layer 112 and a middle water collection area 113 are sequentially arranged in the column shell 101 between the lower supporting plate 105 and the upper supporting plate 104 from bottom to top;
the water distribution device also comprises a raw water tank 2, wherein the raw water tank 2 is connected with one end of a water inlet main pipe 3 with a water inlet pump 4, the other end of the water inlet main pipe 3 is respectively connected with one end of an upper water inlet pipe 5 and one end of a lower water inlet pipe 6, the other end of the upper water inlet pipe 5 is connected with an upper water distribution area 107 through a water distributor 7, and the other end of the lower water inlet pipe 6 is connected with a lower water distribution area 110;
also comprises a middle layer water supply and drainage unit 8 arranged in the middle layer water collection area 113, wherein the middle layer water supply and drainage unit 8 is connected with a drainage pipe 9 with a filtered water outlet valve 10.
As a preferable scheme of this embodiment, the middle layer water supply and drainage unit 8 includes a pair of water collection main pipes 801, and a plurality of perforated water collection pipes 802 are disposed between the pair of water collection main pipes 801; the water collecting main pipe 801 is connected to the water discharging pipe 9. In this embodiment, the middle layer water supply and drainage unit 8 is used for collecting the upper and lower layer filtered water to the water collecting main pipe 801 and discharging the water, and is also used as a back-flushing water inlet and air inlet device of the upper filter material layer 108 to make the back-flushing water distribution and air distribution of the upper layer uniform.
As a preferable scheme of this embodiment, a main water inlet valve 11 and a check valve 12 are further disposed on the water inlet main pipe 3 downstream of the water inlet pump 4. Further, the upper water inlet pipe 5 is also provided with an upper water inlet flow meter 13 and an upper water inlet valve 14; the lower water inlet pipe 6 is also provided with a lower water inlet flow meter 15 and a lower water inlet valve 16.
As a preferable scheme of the embodiment, the system further comprises a backwashing water tank 17, wherein the backwashing water tank 17 is connected with one end of a backwashing water inlet main pipe 18 with a backwashing water pump 19, the other end of the backwashing water inlet main pipe 18 is respectively connected with one end of an upper backwashing water inlet pipe 20 and one end of a lower backwashing water inlet pipe 21, the other end of the upper backwashing water inlet pipe 20 is connected with the middle-layer water supply and drainage unit 8, and the other end of the lower backwashing water inlet pipe 21 is connected with the lower water distribution area 110; the upper part of the upper water distribution area 107 close to the top plate 102 is connected with a back flush water outlet pipe 22 with a back flush water outlet valve 23.
Further, an air compressor 24 with an air inlet valve 25 is connected to the upper backwash water inlet pipe 20 and the lower backwash water inlet pipe 21. The process for realizing gas back flushing.
Further, an upper back-flushing flow meter 26 and an upper back-flushing water inlet valve 27 are also arranged on the upper back-flushing water inlet pipe 20; the lower back-flushing water inlet pipe 21 is also provided with a lower back-flushing flow meter 28 and a lower back-flushing water inlet valve 29.
As a preferable scheme of this embodiment, pressure gauges 30 are respectively provided on the upper filter material layer 108, the lower filter material layer 112, the upper water inlet pipe 5, the lower water inlet pipe 6, the upper backwash water inlet pipe 20 and the lower backwash water inlet pipe 21. In this embodiment, the pressure gauges 30 of the upper filter layer 108 and the lower filter layer 112 are used for monitoring the pressure indexes of the upper filter layer and the lower filter layer in real time, so as to ensure that the middle water collecting area 113 can uniformly and stably drain water, and simultaneously monitor the pressure in the two-way inflow catalytic oxidation filter column 1 during back washing.
As a preferable scheme of this embodiment, the lower water distribution area 110 is further connected with a vent pipe 31 with a vent valve 32. Used for emptying the whole bidirectional flow water inlet catalytic oxidation filter column 1.
The working process and the principle of the device for synchronously removing ammonia nitrogen, iron and manganese in water by catalytic oxidation of bidirectional inflow water are as follows:
the raw water in the raw water pool 2 is pressurized by the water inlet pump 4, then is divided into two branches by the water inlet main pipe 3, and respectively enters the upper water inlet pipe 5 and the lower water inlet pipe 6, the flow is monitored by the upper water inlet flow meter 13 and the lower water inlet flow meter 15, and the water inlet flow is controlled by the upper water inlet valve 14 and the lower water inlet valve 16, so that the control of the filtering speed is realized.
The upper layer inlet water enters the upper water distribution area 107 through the water distributor 7, and forms uniformly distributed downward flow in the upper water distribution area 107, and sequentially passes through the upper filter material layer 108 and the upper support layer 109 to reach the middle layer water collection area 113; the lower layer water enters the lower water distribution area 110, upward flow which is uniformly distributed is formed by the water distribution and air distribution device 106, the upward flow sequentially passes through the lower supporting layer 111 and the lower filter material layer 112 to the middle layer water collection area 113, and the water after up-and-down filtration is mixed in the middle layer water collection area 113 and is discharged through the water discharge pipe 9.
In the two-way flow water inlet catalytic oxidation filtering stage, a water inlet pump 4, a water inlet main valve 11, an upper water inlet valve 14, a lower water inlet valve 16 and a filtered water outlet valve 10 are opened; the upper backwash feed valve 27, the lower backwash feed valve 29, the backwash feed valve 23, the air inlet valve 25, the backwash water pump 19, the air compressor 24 and the blow-down valve 32 are closed.
In the purification process, water inlet and outlet and filter layer edge layer dissolved oxygen data are monitored, and the fact that the upper and lower filter layers are rich in sufficient dissolved oxygen is ensured, so that the capacity of synchronously removing ammonia nitrogen, iron and manganese through catalytic oxidation of the upper and lower filter layers is fully exerted; the pressure index of the pressure gauge 30 at each site is monitored, the stability of the water pressure of the water inlet quantity is ensured, the water distribution in the filter column is uniform, and the middle-layer water collecting area can stably and efficiently drain water.
Along with the increase of the filtering time, suspended particles intercepted by the upper filtering layer and the lower filtering layer are accumulated, the porosity is reduced, the removal effect of the filtering layers on ammonia nitrogen, iron and manganese is gradually weakened, the turbidity is gradually increased, wherein the ammonia nitrogen firstly exceeds the standard, and the period is taken as the filtering period. After the filtration cycle is reached, the upper inlet valve 14 and the lower inlet valve 16 are closed, the upper backwash inlet valve 27 and the lower backwash inlet valve 29 are opened, and backwash is started.
In the back flushing process, an upper back flushing water inlet valve 27, a back flushing water outlet valve 23 and a back flushing water pump 19 are firstly opened, and the upper filter material layer 108 is mainly loosened in the stage; then, a lower backwashing water inlet valve 29, an air compressor 24 and an air inlet valve 25 are opened to carry out simultaneous air-water combined backwashing on the upper and lower filter layers; finally, the air inlet valve 25 and the air compressor 24 are closed, and the whole water backwashing of the filter layer is carried out.
For the upper and lower filter layers of the catalytic oxidation device, the contact catalytic oxidation reaction is completed in the upper and lower filter layers in a short time by utilizing dissolved oxygen carried by inlet water, and ammonia nitrogen, iron and manganese in the water are synchronously removed by fully utilizing the dissolved oxygen in the raw water. And because the system adopts the mode that the upper layer and the lower layer simultaneously feed water and the middle layer discharges water, the running distance of the water in the system is short, the hydraulic load is high, the catalytic oxidation capacity of the filter layer is fully exerted, the treated water quantity is increased, impurities in the intercepted water are filtered, and the effluent turbidity reaches the standard.
Example 2:
this example provides a process for synchronously removing ammonia nitrogen, iron and manganese in water through catalytic oxidation with bidirectional flow water inflow, and as shown in fig. 3, the process adopts the device for synchronously removing ammonia nitrogen, iron and manganese in water through catalytic oxidation with bidirectional flow water inflow provided in example 1.
The process comprises the following steps:
firstly, the concentrations of pollutants in raw water are respectively as follows: the ammonia nitrogen concentration is 0.5-3.0 mg/L, the iron concentration is 0.3-3.0 mg/L, and the manganese concentration is 0.1-3.0 mg/L;
secondly, the filtering rate in the bidirectional flow water inlet catalytic oxidation filtering column 1 is 4.0-12.0 m/h;
third, the dissolved oxygen concentration in the upper filter layer 108 and the lower filter layer 112 is always greater than 2.0mg/L before and after the catalytic oxidation reaction.
As a preferable scheme of the embodiment, the filtration period of the process is 1-5 d.
As a preferable scheme of this embodiment, the upper filter material layer 108 and the lower filter material layer 102 both adopt a catalytic oxidation active filter material of quartz sand with a catalytic iron oxide manganese composite filter membrane loaded on the surface thereof; the total thickness of the filtering layer is 80 cm-160 cm; the thickness of the upper filter material layer 108 is 1/3-1/2 of the total thickness of the filter layers, and the thickness of the lower filter material layer 112 is 1/2-2/3 of the thickness of the filter layers.
As a preferable scheme of this embodiment, the materials of the upper supporting layer 109 and the lower supporting layer 111 are gravels, and three particle size gradations of 2-4 mm, 4-8 mm and 8-16 mm are respectively adopted from top to bottom, and each particle size gradation is 50 mm.
In the embodiment, the top layer water inlet can adopt a spray head, a water inlet channel, a water distribution groove or the like for water distribution; the water inlet at the bottom layer can adopt a filter head or a filter plate and the like to distribute water and gas, and simultaneously play a role in backwashing water distribution and gas distribution,
the variation law of ammonia nitrogen and dissolved oxygen along the layer of different filter columns is shown in fig. 4(a) to 4 (c). As can be seen from FIGS. 4(a) to 4(c), the feed water NH4 +The removal rate of-N is only 71.3% at the position of 120cm of the thickness of the filter layer, while the NH of the bidirectional catalytic oxidation system is at the position of 60cm of the thickness of the upper layer and the lower layer of the filter layer4 +The removal rate of-N can respectively reach 78.6 percent and 76.7 percent, and the concentration of ammonia nitrogen in effluent can reach the water quality standard of drinking water. On the other hand, at the position of the thickness of the filter layer of 40cm, the DO is reduced to 1.68mg/L for the one-way catalytic oxidation system, so that sufficient dissolved oxygen cannot be provided for the lower layer filter material, and the DO of the upper layer and the lower layer of the two-way catalytic oxidation system is respectively 2.53mg/L and 3.31 mg/L. Compared with the prior art, the two-way flow catalytic oxidation system can realize the control of NH on the shorter filter layer thickness4 +Better removal of-N and maintenance of DO in the various filter layers of the system>2.0mg/L, so that sufficient dissolved oxygen in the filter layer participates in the catalytic oxidation reaction.
In SEM pictures before and after the active oxidation film reaction of the catalytic oxidation active filter material, the main component of the manganese oxide film filter film of the upper and lower filter materials in the two-way flow catalytic oxidation system is birnessite (Ca, Mg) Mn14O27·xH2O, therefore, the activity of the upper and lower layers of the columnThe structures of the manganese oxides in the filter membranes are similar and not significantly different. As can be seen from SEM photographs before and after the reaction, the filter membranes are uniformly attached to the quartz sand filter material before the reaction, the filter material surface filter membranes of the upper layer and the lower layer of the filter column after the reaction are all granular and have rich pores, the granular matters are newly formed manganese oxides, and the surface appearances of the filter materials of the upper layer and the lower layer are not obviously different.
In this embodiment, when the two-way flow water inlet catalytic oxidation filter column 1 is back-flushed, the steps are as follows: upper water backwashing → upper and lower integral air-water combined backwashing → integral water backwashing:
firstly, washing water with the strength of (3-10) L/(s.m 2) is used for 1-2 minutes through an upper back washing water inlet pipe 20 to wash upper-layer filter materials.
Secondly, the backwashing water pump 19 and the air compressor 24 carry out air-water combined backwashing, and the strength of the backwashing water inlet pipe 21 is (3-10) L/(s.m)2) The water impact and strength of (10 to 20) L/(s.m)2) The air impact reaches 5-6 minutes, and the lower-layer filter material is mainly flushed. Meanwhile, the water flushing intensity (1-2) L/(s.m) is kept in the upper back flushing water inlet pipe 202) And corresponding gas flushing strength.
Thirdly, finally, the whole water backwashing is carried out for 1 to 2 minutes through the lower backwashing water inlet pipe 21, and the water flushing strength is (3 to 12) L/(s.m)2)。
Raw water enters the bidirectional-flow water inlet catalytic oxidation filter column 1 from the top and the bottom respectively, and a filter layer can efficiently remove ammonia nitrogen, iron and manganese in water by catalytic oxidation depending on sufficient dissolved oxygen in inlet water while intercepting suspended matters in water; the filtering speed of the bidirectional flow water inlet catalytic oxidation filtering column 1 is 4.0 m/h-12.0 m/h.
When raw water passes through the upper and lower chemical catalytic oxidation filter layers, the dissolved oxygen in the inlet water is fully utilized by means of short-distance operation and high hydraulic load, the dissolved oxygen concentration of each stage of filter layer in the filter column is ensured to be more than 2.0mg/L, the whole filter layer can fully play a role in intercepting residual suspended matters in the water from top to bottom, the effluent turbidity is ensured to reach the standard, compared with a one-way catalytic oxidation filter column, the water treatment amount in unit time is increased by 1-2 times, and the production rate is 1-2 times of that of the one-way catalytic oxidation filter column.
The process of the utility model fully utilizes the dissolved oxygen in the inlet water, does not need additional oxygen supplement, and ensures that each layer of filter material can play a role of catalytic oxidation to the maximum extent. The process can solve the problems of low treatment effect of ammonia nitrogen, iron and manganese and low utilization rate of the filter layer caused by insufficient dissolved oxygen of the lower layer in the catalytic oxidation filter layer in the prior art, and the problems of complex filter tank structure, increased water treatment cost and insufficient water treatment amount caused by additional oxygenation equipment.
The process improves the hydraulic load of the operation of the filtering system, reduces the contact reaction time, and increases the treated water in unit time by 1-2 times.
The process of the utility model also has the advantages of less engineering investment, low operation cost, small occupied area and simple implementation; the method is also suitable for new construction, upgrading and reconstruction of surface water plants and underground water plants.
Example 3:
in this embodiment, based on the process for synchronously removing ammonia nitrogen, iron and manganese in water by catalytic oxidation of bidirectional inflow water as given in example 2, experimental study is performed, and a comparative experiment is performed with a common filter column.
The raw water adopts the groundwater in the northwest region, and the designed water inflow is 1.0m3The designed filtering speed is 8.0m/h, the filter material layer of the filter column adopts a homogeneous composite ferro-manganese quartz sand filter material, the equivalent grain diameter is 1.2mm, and the non-uniform coefficient K801.38, the total thickness of the filter material layer is 1.2m (the upper layer is 0.4m, and the lower layer is 0.8 m); and (3) continuously adding the Fe salt with the concentration of 1.3-1.8 mg/L, the Mn salt with the concentration of 1.3-1.8 mg/L and the ammonia nitrogen with the concentration of 1.3-1.8 mg/L into the raw water at the same time, carrying out a synchronous catalytic oxidation removal test, and operating for 30 days. The ammonia nitrogen in the effluent water after treatment is always stably kept below 0.3mg/L, and the dissolved oxygen in the water inlet and the water outlet and along the layer is more than 2.0mg/L, which shows that the removal effect of the bidirectional flow reactor on ammonia nitrogen, iron and manganese is stable and efficient, and the system continuously operates for more than 30 days, as shown in fig. 5(a) to 5 (c).
As can be seen from FIGS. 5(a) to 5(c), the concentration of ammonia nitrogen in the feed water is 1.3 to 1.8mg/L, and Mn is present2+The concentration is 1.3-1.8 mg/L, Fe2+Bidirectional flow synchronous catalytic oxidation test with concentration of 1.3-1.8 mg/LAnd the operation is carried out for 30 days, the ammonia nitrogen concentration of the treated effluent is always stably kept below 0.3mg/L, and the Mn of the effluent is2+Less than 0.1mg/L, Fe in the effluent2+The removal effect of the two-way flow reactor on ammonia nitrogen, iron and manganese is stable and efficient, the system continuously runs for more than 30 days, and the ammonia nitrogen, manganese and iron in the effluent completely meet the requirements of sanitary Standard for Drinking Water (GB 5749-2006).
Claims (9)
1. The device for synchronously removing ammonia nitrogen, iron and manganese in water through catalytic oxidation by using bidirectional inflow water is characterized by comprising a bidirectional inflow water catalytic oxidation filter column (1), wherein the bidirectional inflow water catalytic oxidation filter column (1) comprises a column shell (101), a top plate (102) is arranged at the top end of the column shell (101), a bottom plate (103) is arranged at the bottom end of the column shell (101), an upper supporting plate (104) and a lower supporting plate (105) are arranged in the column shell (101), and a water distribution and gas distribution device (106) is respectively arranged on the upper supporting plate (104) and the lower supporting plate (105);
an upper water distribution area (107), an upper filter material layer (108) and an upper supporting layer (109) are sequentially arranged in the column shell (101) between the top plate (102) and the upper supporting plate (104) from top to bottom; a lower water distribution area (110) is arranged in the column shell (101) between the bottom plate (103) and the lower supporting plate (105), and a lower bearing layer (111), a lower filter material layer (112) and a middle layer water collection area (113) are sequentially arranged in the column shell (101) between the lower supporting plate (105) and the upper supporting plate (104) from bottom to top;
the water distributor is characterized by further comprising a raw water tank (2), wherein the raw water tank (2) is connected with one end of a water inlet main pipe (3) with a water inlet pump (4), the other end of the water inlet main pipe (3) is respectively connected with one end of an upper water inlet pipe (5) and one end of a lower water inlet pipe (6), the other end of the upper water inlet pipe (5) is connected with an upper water distribution area (107) through a water distributor (7), and the other end of the lower water inlet pipe (6) is connected with a lower water distribution area (110);
the water-saving device also comprises a middle-layer water supply and drainage unit (8) arranged in the middle-layer water collection area (113), wherein the middle-layer water supply and drainage unit (8) is connected with a drainage pipe (9) with a filtered water outlet valve (10).
2. The device for synchronously removing ammonia nitrogen, iron and manganese in water by catalytic oxidation of bidirectional inflow water as claimed in claim 1, wherein the middle layer water supply and drainage unit (8) comprises a pair of water collecting main pipes (801), and a plurality of perforated water collecting pipes (802) are arranged between the pair of water collecting main pipes (801); the water collecting main pipe (801) is connected with a water discharging pipe (9).
3. The device for synchronously removing ammonia nitrogen, iron and manganese in water by catalytic oxidation of bidirectional inflow water as claimed in claim 1, wherein the water inlet main pipe (3) at the downstream of the water inlet pump (4) is further provided with a water inlet main valve (11) and a check valve (12).
4. The device for synchronously removing ammonia nitrogen, iron and manganese in water by catalytic oxidation of bidirectional inflow water as claimed in claim 1, wherein the upper water inlet pipe (5) is further provided with an upper water inflow meter (13) and an upper water inlet valve (14); the lower water inlet pipe (6) is also provided with a lower water inlet flow meter (15) and a lower water inlet valve (16).
5. The device for synchronously removing ammonia nitrogen, iron and manganese in water through catalytic oxidation of bidirectional inflow water as claimed in claim 1, characterized by further comprising a backwash water tank (17), wherein the backwash water tank (17) is connected with one end of a backwash water inlet main pipe (18) with a backwash water pump (19), the other end of the backwash water inlet main pipe (18) is respectively connected with one end of an upper backwash water inlet pipe (20) and one end of a lower backwash water inlet pipe (21), the other end of the upper backwash water inlet pipe (20) is connected with the middle layer water supply and drainage unit (8), and the other end of the lower backwash water inlet pipe (21) is connected with the lower water distribution area (110); the upper part of the upper water distribution area (107) is connected with a back washing water outlet pipe (22) with a back washing water outlet valve (23) at a position close to the top plate (102).
6. The device for removing ammonia nitrogen, iron and manganese in water synchronously by catalytic oxidation of bidirectional inflow water as claimed in claim 5, characterized in that the upper backwash water inlet pipe (20) and the lower backwash water inlet pipe (21) are further connected with an air compressor (24) with an air inlet valve (25).
7. The device for synchronously removing ammonia nitrogen, iron and manganese in water by catalytic oxidation of bidirectional inflow water as claimed in claim 5, wherein an upper backwash flow meter (26) and an upper backwash water inlet valve (27) are further arranged on the upper backwash water inlet pipe (20); the lower back-washing water inlet pipe (21) is also provided with a lower back-washing flow meter (28) and a lower back-washing water inlet valve (29).
8. The device for synchronously removing ammonia nitrogen, iron and manganese in water by catalytic oxidation of bidirectional inflow water as claimed in claim 5, wherein the upper filter material layer (108), the lower filter material layer (112), the upper water inlet pipe (5), the lower water inlet pipe (6), the upper backwash water inlet pipe (20) and the lower backwash water inlet pipe (21) are respectively provided with a pressure gauge (30).
9. The device for synchronously removing ammonia nitrogen, iron and manganese in water by catalytic oxidation of bidirectional inflow water as claimed in claim 1, wherein the lower water distribution area (110) is further connected with a blow-down pipe (31) with a blow-down valve (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220325468.8U CN216890263U (en) | 2022-02-17 | 2022-02-17 | Device for synchronously removing ammonia nitrogen, iron and manganese in water through two-way flow water inlet catalytic oxidation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220325468.8U CN216890263U (en) | 2022-02-17 | 2022-02-17 | Device for synchronously removing ammonia nitrogen, iron and manganese in water through two-way flow water inlet catalytic oxidation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216890263U true CN216890263U (en) | 2022-07-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220325468.8U Active CN216890263U (en) | 2022-02-17 | 2022-02-17 | Device for synchronously removing ammonia nitrogen, iron and manganese in water through two-way flow water inlet catalytic oxidation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216890263U (en) |
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2022
- 2022-02-17 CN CN202220325468.8U patent/CN216890263U/en active Active
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