CN114477414B - Device and method for removing iron and manganese in underground water based on self-circulation of high-concentration active manganese oxide - Google Patents
Device and method for removing iron and manganese in underground water based on self-circulation of high-concentration active manganese oxide Download PDFInfo
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Abstract
The invention discloses a device and a method for removing iron and manganese in underground water based on self-circulation of high-concentration active manganese oxide, and belongs to the field of underground water treatment. The invention aims to solve the technical problems of longer start-up period, poor treatment effect and the like in the existing underground water iron and manganese removal technology. The device comprises a main reaction zone, an inclined tube settling zone, a secondary settling zone and an active manganese oxide backflow facility, wherein a small-distance aeration pipeline is arranged at the bottom of the device, aeration drives water flow and iron and manganese oxides to stir, transfer mass, react and circulate in a reactor, the water flow and the iron and manganese oxides are further oxidized and separated in the inclined tube settling zone, the active iron and manganese oxides flow back to the main reaction zone, the reacted water enters the secondary settling zone, the active manganese oxides are further settled and periodically flow back to the main reaction zone, the treated water overflows from a water outlet and enters a subsequent ultrafiltration membrane tank for filtration treatment.
Description
Technical Field
The invention belongs to the field of underground water treatment, and particularly relates to a device and a method for removing iron and manganese in underground water based on self-circulation of high-concentration active manganese oxide.
Background
The underground water is one of main fresh water resources of human beings, and has the advantages of stable water quantity and good water quality. Compared with surface water, the underground water has simple water treatment facilities, low operation cost and good water supply quality, and is an ideal drinking water source. However, in some regions, groundwater suffers from overproof problems such as iron, manganese, etc., due to local hydrology, geology and human activity.
According to the regulation of the sanitary Standard for Drinking Water (GB5749) in China, the concentration of iron ions must be lower than 0.3mg/L, and the concentration of manganese ions must be lower than 0.1 mg/L. When the iron and manganese contents in the water are too high, the sense is influenced; the formed iron and manganese oxides can be deposited in the pipeline and finally can block the pipeline; excess manganese can also affect human health.
At present, there are many methods for removing iron and manganese in underground water, mainly including contact oxidation, biological oxidation, natural oxidation, chemical agent oxidation and the like. The contact oxidation method is mainly used in most areas of China. The iron-containing and manganese-containing underground water enters a filter tank for filtering after being aerated, and is oxidized into iron and manganese oxides under the catalytic oxidation action of an active filter membrane formed on the surface of a filter material and is retained in the filter tank, so that the effects of removing iron and manganese are achieved. However, the time required for forming the active filter membrane on the surface of the filter material is generally long (dozens of days or even months), and the method has the problems of unstable treatment effect, large occupied area and the like, thereby greatly limiting the popularization and application of the method.
Disclosure of Invention
The invention aims to solve the technical problems of long start-up period, large occupied area, expensive filler, poor treatment effect and the like of the existing underground water iron and manganese removing method, and develops a device and a method for removing iron and manganese in underground water based on self-circulation of high-concentration active manganese oxide.
The device for removing iron and manganese in underground water based on self-circulation of high-concentration active manganese oxide comprises a box body and a top cover, wherein the box body is divided into a reaction area and a secondary sedimentation area along the vertical direction;
the reaction zone is divided into a main reaction zone and an inclined tube settling zone, the bottoms and the tops of the main reaction zone and the inclined tube settling zone are communicated with each other, and the first guide plates are fixedly connected to two opposite side walls of the reaction zone;
the bottom of the main reaction zone is provided with a perforated water distribution plate, the side wall below the perforated water distribution plate is provided with a water inlet and a manganese oxide inlet, a plurality of aeration pipelines are arranged below the perforated water distribution plate, a stirring device is arranged in the main reaction zone and penetrates through a top cover, and an arc-shaped guide plate is arranged between the top cover and the left side wall of the box body;
a plurality of small-diameter inclined tubes inclined towards the bottom are arranged on the wall between the inclined tube settling zone and the secondary settling zone, the inclined tube settling zone is communicated with the secondary settling zone through the small-diameter inclined tubes, and a sludge accumulation side plate is arranged at the bottom of the inclined tube settling zone;
the top cover comprises a first surface and a second surface, wherein the first surface covers the reaction zone, the second surface covers the secondary sedimentation zone, a water outlet hole communicated with the secondary sedimentation zone is formed in the second surface, an exhaust hole communicated with the inclined tube sedimentation zone is formed in the first surface, the exhaust hole is located at the junction of the first surface and the second surface, the top cover is of an integral structure, the second surface is a horizontal plane, and the first surface is a slope surface which is inclined upwards by taking the horizontal plane of the second surface as a reference;
second guide plate fixed connection is on two subtend lateral walls of secondary sedimentation district to separate the secondary sedimentation district into the two parts of intercommunication, second guide plate and first guide plate parallel arrangement, the bottom of secondary sedimentation district is equipped with first long-pending mud swash plate and the long-pending mud swash plate of second to extending to two lateral walls parallel with the second guide plate, the bottom of secondary sedimentation district is equipped with the mud pipe, the mud pipe passes the box.
Further, the slope h/l of the first surface is 3 ‰.
Further limiting, a manganese oxide backflow facility is arranged outside the box body and connected with the sludge discharge pipe.
Further limiting, the number of the aeration pipelines is 6-10, the distance is 5-15 mm, and the aeration intensity of the aeration pipelines is 5m 3 /(m 2 ·h)～100m 3 /(m 2 H) the aeration area is 20-100% of the cross-sectional area of the main reaction zone.
Further inject, the contained angle of long-pending mud curb plate and bottom is 40 ~ 60, the contained angle of first long-pending mud swash plate and second long-pending mud swash plate and bottom is 50 ~ 80.
Further limiting, the small-diameter inclined tubes are arranged on the side wall in a rectangular array, the diameter of each small-diameter inclined tube is 5-100 mm, the length of each small-diameter inclined tube is 30-120 cm, the distance between each small-diameter inclined tube and the side wall is 0.5-5 cm, the included angle of the acute angle between each small-diameter inclined tube and the side wall is 45-75 degrees, and each small-diameter inclined tube is a single-layer tube or a double-layer tube.
Further limiting, the water distribution holes on the perforated water distribution plate are arranged in a rectangular array, the diameter of the water distribution holes is 10-50 mm, the hole interval is 10-50 mm, and the interval between the water distribution holes and the side wall of the box body does not exceed the hole interval.
The method for removing iron and manganese in underground water based on the device for removing iron and manganese in underground water by self-circulation of high-concentration active manganese oxide comprises the following steps:
step 1: adding manganese oxide from a manganese oxide inlet;
step 2: raw water is introduced from a water inlet;
and step 3: and opening an aeration pipeline and a stirring device to perform self-circulation water treatment.
Further limiting, the manganese oxide added in the step 1 is 100 g/L-10000 g/L calculated by the effective volume of the main reaction zone.
Further, the rotation speed of the stirring device in the step 3 is 2 rpm-100 rpm.
Further limiting, the retention time of the water body in the main reaction area in the self-circulation water treatment process in the step 3 is 3-20 min, and the retention time of the water body in the whole device is 30-90 min.
The working principle of the invention is as follows: firstly, adding a proper amount of iron-manganese oxide into a device through a manganese oxide inlet, then, allowing underground raw water containing iron and manganese to flow into a main reaction zone from a water inlet, enabling the raw water and the manganese oxide to be in full contact through an air flow generated by a bottom aeration pipeline in the main reaction zone, promoting circulation and solid-liquid-gas mass transfer reaction by means of mechanical stirring, then, allowing the raw water and the manganese oxide to enter a gas-solid-liquid three-phase velocity zone (a zone above a small-diameter inclined tube), discharging gas through an exhaust hole, enabling the water and the manganese oxide to rotate to a inclined tube settling zone, wherein the iron-manganese active oxide precipitated and separated by the small-diameter inclined tube returns to the bottom of the main reaction zone along a sludge deposition side plate, allowing the water to enter a secondary settling zone through the small-diameter inclined tube, further settling suspended matters in the zone, and periodically returning the precipitated iron-manganese active oxide to the main reaction zone through a manganese oxide reflux facility, the redundant iron-manganese active oxide is discharged out of the system through a sludge discharge pipe, and the treated water flows out of the water outlet hole.
Compared with the prior art, the invention has the following remarkable effects:
1. the device of the invention adopts the active iron-manganese oxide which has high-efficiency catalytic oxidation effect on iron and manganese, so that the device has high-efficiency iron and manganese removing efficiency at the initial operation stage of the process, shortens the starting period of the manganese removing from dozens of days or even months to several hours, and obviously saves the occupied area.
2. The device synchronously realizes aeration, oxygenation, self-circulation, mass transfer and reaction by arranging a small-interval aeration facility, mechanically assisting lifting and micro-pressure single-side aeration, leads raw water to be fully contacted with iron active oxide and manganese active oxide in a main reaction zone through air flow disturbance, achieves the effect of strengthening manganese removal, and has high unit volume treatment capacity and low required medicine consumption.
3. The device of the invention utilizes iron ions and manganese ions in water to be continuously catalyzed and oxidized into iron-manganese oxide with catalytic oxidation activity, thereby keeping the high-efficiency catalytic activity of the iron-manganese oxide in the system, simultaneously utilizes inclined tube precipitation and sludge circulation to keep the concentration of the iron-manganese oxide in a reaction zone at a higher level all the time, and the redundant iron-manganese oxide is periodically discharged through a sludge discharge pipe, so that the iron-manganese oxide in the device can maintain the high-efficiency operation (without adding the manganese oxide for two times) only by adding once, and the investment cost and the operation and maintenance cost are greatly saved.
4. The device of the invention forms two rapid separation barriers, namely a gas-solid-liquid three-phase rapid partition and an inclined tube settling zone, so as to realize rapid separation of particles and water, and simultaneously, the invention designs a top cover into a mode that the left and the right are not at the same horizontal height so that gas can be better discharged through an exhaust hole, so that the hydraulic condition in a reaction zone is smoother, and in addition, the inner wall of the inclined tube with small diameter also forms an active filter membrane to further deeply remove iron, manganese and ammonia nitrogen. Therefore, the device disclosed by the invention is coupled with multiple functions of aeration oxygenation, aeration water power, iron and manganese removal, solid-liquid-gas three-phase rapid separation, sludge self-circulation, a tubular reactor and the like, can be used for intensively removing iron and manganese in underground water, and is an important innovation for the traditional iron and manganese removal technology.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
the reactor comprises a tank body 1, a reaction zone 2, a main reaction zone 2, an inclined tube settling zone 2, a secondary settling zone 3, a top cover 4, a first guide plate 5, an aeration pipeline 6, a sludge accumulation side plate 7, an inclined tube 8, a small-diameter inclined tube 9, a second guide plate 10, a first sludge accumulation inclined plate 11, a second sludge accumulation inclined plate 12, a sludge discharge pipe 13, a water inlet 13, a manganese oxide inlet 14, a perforated water distribution plate 15, a stirring device 16, an exhaust hole 17, a water outlet 18, a manganese oxide reflux facility 19 and an arc-shaped guide plate 20.
Detailed Description
Example 1: the following embodiments are further described with reference to fig. 1-2:
the device for removing iron and manganese in underground water based on self-circulation of high-concentration active manganese oxide comprises a box body 1 and a top cover 4, wherein the box body 1 is divided into a reaction area 2 and a secondary sedimentation area 3 along the vertical direction;
the reaction zone 2 is divided into a main reaction zone 2-1 and an inclined tube settling zone 2-2, the bottoms and the tops of which are communicated, by a first guide plate 5 which is vertically arranged, and the first guide plate 5 is fixedly connected to two opposite side walls of the reaction zone 2;
a perforated water distribution plate 15 is arranged at the bottom of the main reaction zone 2-1, a water inlet 13 and a manganese oxide inlet 14 are formed in the side wall below the perforated water distribution plate 15, a plurality of aeration pipelines 6 are arranged below the perforated water distribution plate 15, a stirring device 16 is arranged in the main reaction zone 2-1, the stirring device 16 penetrates through a top cover 4, and an arc-shaped guide plate 20 is arranged between the top cover 4 and the left side wall of the box body 1;
a plurality of small-diameter inclined pipes 8 inclined towards the bottom are arranged on the wall between the inclined pipe settling zone 2-2 and the secondary settling zone 3, the inclined pipe settling zone 2-2 is communicated with the secondary settling zone 3 through the small-diameter inclined pipes 8, and a sludge accumulation side plate 7 is arranged at the bottom of the inclined pipe settling zone 2-2;
the top cover 4 comprises a first surface and a second surface, wherein the first surface covers the reaction zone 2, the second surface covers the secondary sedimentation zone 3, a water outlet hole 18 communicated with the secondary sedimentation zone 3 is formed in the second surface, an exhaust hole 17 communicated with the inclined tube sedimentation zone 2-2 is formed in the first surface, the exhaust hole 17 is located at the junction of the first surface and the second surface, the top cover 4 is of an integral structure, the second surface is a horizontal surface, the first surface is a slope surface which is inclined upwards by taking the horizontal surface of the second surface as a reference, and the gradient h/l of the first surface is 3 per thousand;
the second guide plate 9 is fixedly connected to two opposite side walls of the secondary sedimentation zone 3 and divides the secondary sedimentation zone 3 into two communicated parts, the second guide plate 9 is arranged in parallel with the first guide plate 5, the bottom of the secondary sedimentation zone 3 is provided with a first sludge accumulation inclined plate 10 and a second sludge accumulation inclined plate 11 which extend to the two side walls parallel to the second guide plate 9, the bottom of the secondary sedimentation zone 3 is provided with a sludge discharge pipe 12, and the sludge discharge pipe 12 penetrates through the box body 1;
the external portion of box 1 is equipped with manganese oxide backward flow facility 19, manganese oxide backward flow facility 19 links to each other with mud pipe 12, box 1 is the cuboid box that is formed by organic glass board bonding, the number of aeration pipeline 6 is 7, and the interval is 10mm, the aeration intensity of aeration pipeline 6 is 5m 3 /(m 2 ·h)～100m 3 /(m 2 H), the aeration area is 20-100% of the cross section area of the main reaction zone 2-1, the included angle between the sludge-accumulating side plate 7 and the bottom is 45 degrees, and the included angles between the first sludge-accumulating inclined plate 10 and the second sludge-accumulating inclined plate 11 and the bottom are both 70 degrees.
The inclined tubes 8 with the small diameters are arranged on the side wall in a rectangular array (12 multiplied by 15), the diameter of each inclined tube 8 with the small diameters is 25mm, the length of each inclined tube is 35cm, the distance between each inclined tube 8 with the small diameters is 4cm, the included angle of the acute angle between each inclined tube 8 with the side wall is 45 degrees, each inclined tube 8 with the small diameters is a single tube, the material of each inclined tube is an organic glass tube, and the wall thickness of each inclined tube is 2 mm.
The water distribution holes in the perforated water distribution plate 15 are arranged in a rectangular array, the diameter of each water distribution hole is 15mm, the hole interval is 30mm, and the interval between each water distribution hole and the side wall of the box body does not exceed the hole interval.
The working principle is as follows: firstly, adding a proper amount of iron-manganese oxide into the device through a manganese oxide inlet 14, then, allowing the iron-containing and manganese-containing underground raw water to flow into a main reaction zone 2-1 through a water inlet 13, enabling the raw water and the manganese oxide to be in full contact through an air flow generated by a bottom aeration pipeline 6 in the main reaction zone 2-1, promoting circulation and solid-liquid-gas three-phase mass transfer reaction by means of mechanical stirring, then, allowing the raw water and the manganese oxide to enter a gas-solid-liquid three-phase velocity zone (a zone above a small-diameter inclined pipe 8), discharging gas through an exhaust hole 17, enabling the water and the manganese oxide to rotate to a inclined pipe settling zone 2-3, wherein the iron-manganese active oxide precipitated and separated by the small-diameter inclined pipe 8 returns to the bottom of the main reaction zone 2-1 along a sludge side plate 7, and water enters a secondary settling zone 3 through the small-diameter inclined pipe 8 in the zone, the suspended matters are further precipitated and periodically flow back to the main reaction zone 2-1 through the precipitated active oxides of iron and manganese through a manganese oxide backflow facility 19, redundant active oxides of iron and manganese are discharged out of the system through a sludge discharge pipe 12, and the treated water flows out through a water outlet hole 18.
Example 2, the difference between this example and example 1 is: the small-diameter inclined tube 8 is a double-layer tube sleeved with a silica gel tube, the inner layer of the small-diameter inclined tube is 2mm thick, the outer layer of the small-diameter inclined tube is an organic glass tube, and the wall thickness of the small-diameter inclined tube is 2 mm.
Example 3, the apparatus for removing iron and manganese in groundwater by self-circulation of example 1 and example 2 is used for simulation treatment of groundwater, and the specific treatment process is carried out according to the following steps:
step 1: adding manganese oxide from a manganese oxide inlet 14, wherein the added manganese oxide is 1000g/L calculated by the effective volume of the main reaction zone 2-1;
step 2: raw water is introduced from a water inlet 13, the flow rate of the raw water is 10L/min, the concentration of iron in the underground water is 2mg/L, and the concentration of manganese is 2.0 mg/L;
and step 3: the aeration pipeline 6 and the stirring device 16 are opened, and the aeration intensity of the aeration pipeline 6Is 20m 3 /(m 2 H), the aeration area is 42.5 percent of the cross section area of the main reaction zone 2-1, the rotating speed of the stirring device 16 is 100rpm, the retention time of the water body in the main reaction zone 2-1 is 20min, and the retention time of the water body in the whole device is 30min, and self-circulation water treatment is carried out. The effluent test results are shown in table 1.
TABLE 1 Water quality data of influent and effluent
In conclusion, because the iron-containing and manganese-containing groundwater raw water and the high-concentration active manganese oxide are stirred, transferred and reacted in the reaction zone, iron and manganese ions in the raw water are efficiently removed.
Claims (10)
1. The device for removing iron and manganese in underground water based on self-circulation of high-concentration active manganese oxide is characterized by comprising a box body (1) and a top cover (4), wherein the box body (1) is vertically divided into a reaction zone (2) and a secondary sedimentation zone (3);
the reaction zone (2) is divided into a main reaction zone (2-1) and an inclined tube settling zone (2-2) by a first guide plate (5) which is vertically arranged, wherein the bottom and the top of the main reaction zone are communicated, and the first guide plate (5) is fixedly connected to two opposite side walls of the reaction zone (2);
a perforated water distribution plate (15) is arranged at the bottom of the main reaction zone (2-1), a water inlet (13) and a manganese oxide inlet (14) are formed in the side wall below the perforated water distribution plate (15), a plurality of aeration pipelines (6) are arranged below the perforated water distribution plate (15), a stirring device (16) is arranged in the main reaction zone (2-1), the stirring device (16) penetrates through the top cover (4), and a circular arc-shaped guide plate (20) is arranged between the top cover (4) and the left side wall of the box body (1);
a plurality of small-diameter inclined pipes (8) inclined towards the bottom are arranged on the wall between the inclined pipe settling zone (2-2) and the secondary settling zone (3), the inclined pipe settling zone (2-2) is communicated with the secondary settling zone (3) through the small-diameter inclined pipes (8), and a sludge accumulation side plate (7) is arranged at the bottom of the inclined pipe settling zone (2-2);
the top cover (4) comprises a first surface and a second surface, wherein the first surface covers the reaction zone (2), the second surface covers the secondary sedimentation zone (3), a water outlet hole (18) communicated with the secondary sedimentation zone (3) is formed in the second surface, an exhaust hole (17) communicated with the inclined tube sedimentation zone (2-2) is formed in the first surface, the exhaust hole (17) is located at the junction of the first surface and the second surface, the top cover (4) is of an integral structure, the second surface is a horizontal plane, and the first surface is a slope surface which is inclined upwards by taking the horizontal plane of the second surface as a reference;
second guide plate (9) fixed connection is on two subtend lateral walls of secondary sedimentation district (3) to separate into the two parts of intercommunication with secondary sedimentation district (3), second guide plate (9) and first guide plate (5) parallel arrangement, the bottom of secondary sedimentation district (3) is equipped with first long-pending mud swash plate (10) and the long-pending mud swash plate of second (11) to two lateral walls extension parallel with second guide plate (9), the bottom of secondary sedimentation district (3) is equipped with mud pipe (12), mud pipe (12) pass box (1).
2. The apparatus for self-circulation removal of iron and manganese from groundwater based on high concentration active manganese oxide as claimed in claim 1, wherein the slope of the first surface is 3 ‰.
3. The device for removing ferro-manganese in underground water based on self-circulation of high-concentration active oxides of manganese according to claim 1, wherein the box body (1) is externally provided with an oxide of manganese backflow facility (19), and the oxide of manganese backflow facility (19) is connected with a sludge discharge pipe (12).
4. The device for removing ferro-manganese in underground water based on self-circulation of high-concentration active manganese oxide according to claim 1, wherein the number of the aeration pipelines (6) is 6-10, the distance is 5-15 mm, and the aeration intensity of the aeration pipelines (6) is 5m 3 /(m 2 ·h)～100m 3 /(m 2 H) aeration areaIs 20 to 100 percent of the cross section area of the main reaction zone (2-1).
5. The device for removing ferro-manganese in underground water based on self-circulation of high-concentration active manganese oxide according to claim 1, wherein the included angle between the sludge-accumulating side plates (7) and the bottom is 40-60 degrees, and the included angle between the first sludge-accumulating inclined plate (10) and the bottom is 50-80 degrees.
6. The device for removing iron and manganese in underground water based on self-circulation of high-concentration active manganese oxide according to claim 1, wherein the small-diameter inclined tubes (8) are arranged on the side wall in a rectangular array, the diameter of the small-diameter inclined tubes (8) is 5 mm-100 mm, the length of the small-diameter inclined tubes is 30 cm-120 cm, the distance between the small-diameter inclined tubes is 0.5 cm-5 cm, the angle of the acute angle formed between the small-diameter inclined tubes (8) and the side wall is 45-75 degrees, and the small-diameter inclined tubes (8) are single-tube or double-layer tubes.
7. The device for removing ferro-manganese in underground water based on self-circulation of high-concentration active manganese oxide according to claim 1, wherein the water distribution holes on the perforated water distribution plate (15) are arranged in a rectangular array, the diameter of the water distribution holes is 10 mm-50 mm, the hole distance is 10 mm-50 mm, and the distance between the water distribution holes and the side wall of the tank body does not exceed the hole distance.
8. The method for removing iron and manganese in underground water by using the device for removing iron and manganese in underground water based on self-circulation of high-concentration active manganese oxide, which is disclosed by any one of claims 1 to 7, is characterized by comprising the following steps of:
step 1: adding oxides of manganese from oxides of manganese inlet (14);
step 2: raw water is introduced from a water inlet (13);
and step 3: and opening an aeration pipeline (6) and a stirring device (16) to perform self-circulation water treatment.
9. The method for removing ferro-manganese in underground water by the device for removing ferro-manganese in underground water based on self-circulation of high-concentration active manganese oxide as claimed in claim 8, wherein the manganese oxide added in step 1 is 100g/L to 10000g/L based on the effective volume of the main reaction zone (2-1).
10. The method for removing iron and manganese in underground water based on the device for self-circulation removal of iron and manganese in underground water by high-concentration active manganese oxide according to claim 8, wherein the rotation speed of the stirring device (16) in step 3 is 2-100 rpm, the retention time of the water body in the main reaction zone (2-1) in the self-circulation water treatment process in step 3 is 3-20 min, and the retention time of the water body in the whole device is 30-90 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210048552.4A CN114477414B (en) | 2022-01-17 | 2022-01-17 | Device and method for removing iron and manganese in underground water based on self-circulation of high-concentration active manganese oxide |
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| CN114477414A (en) | 2022-05-13 |
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