Device for removing iron and manganese from mine gushing water

Abstract

The utility model discloses a device for removing iron and manganese from mine gushing water, which comprises a pre-oxidation tank, a stirring and dosing tank, a sedimentation tank, a filter tank and a water outlet tank which are sequentially arranged, and further comprises an alkali adding mechanism for adding an alkali agent into the pre-oxidation tank and a dosing mechanism for adding a coagulant into the stirring and dosing tank, the pre-oxidation tank is communicated with a water inlet pipe and a stirring and dosing tank, an aeration head is arranged in the pre-oxidation tank and connected with an aeration fan, a stirrer is arranged in the stirring and dosing tank, the stirring and dosing tank is communicated with a sedimentation tank through a second water passing hole, an effluent weir and an inclined plate filler are arranged in the sedimentation tank, the effluent weir is arranged above the inclined plate filler, and the inclined plate filler is arranged in the sedimentation tank. A water distribution pipe and a filter material are arranged in the filter tank, the water distribution pipe is arranged above the filter material and is communicated with the effluent weir, the filter tank is communicated with the water outlet tank through a third water through hole, the third water through hole is arranged below the filter material, and the water outlet tank is communicated with the water drainage pipe. The utility model obviously reduces the energy consumption, prolongs the service life of the filter material, and has good iron and manganese removal effect.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial sewage treatment, in particular to a mine water gushing iron and manganese removal device. Background Art

[0002] Conventionally, for groundwater with high iron and manganese content, the process of oxygenation and filtration is often used. The iron and manganese ions are first oxidized by aeration, and then the iron and manganese are removed by manganese sand and quartz sand filter media. However, mine underground water is different from clean groundwater. Since most of it is in an open open-air environment, the water flowing through the working surface will bring in a large amount of suspended matter such as coal powder and rock particles, causing the mine water to be turbid and often carrying a large amount of suspended matter. If the conventional oxidation and manganese sand filtration process is used to treat mine underground water, the filter will often be blocked and frequent backwashing is required, which will shorten the service life of the filter material and generate a large amount of backwashing drainage, which will return to the front end and increase the treatment load of the water plant. In addition, in order to reduce the land occupation and improve the interception effect of pollutants, the filter tank often uses a high-pressure rapid filter tank, whose water inlet pump has a high head, a power of , and a large energy consumption. However, for the low-turbidity wastewater produced by the precipitation pretreatment of iron and manganese, this high-energy consumption and fast filtration speed equipment no longer has an advantage. Summary of the invention

[0003] In order to solve the problems of filter clogging and high energy consumption in the above-mentioned mine water treatment, the utility model proposes a mine water iron and manganese removal device to reduce energy consumption and improve the iron and manganese removal effect.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a mine water iron and manganese removal device, which is characterized by comprising a pre-oxidation tank, a stirring and dosing tank, a sedimentation tank, a filtering tank and a water outlet tank which are arranged in sequence, and also comprising an alkali adding mechanism for adding alkali agent to the pre-oxidation tank and a dosing mechanism for adding coagulant to the stirring and dosing tank, the pre-oxidation tank is connected with the water inlet pipe and the stirring and dosing tank, an aeration head is arranged in the pre-oxidation tank, the aeration head is connected with the aeration fan, an agitator is arranged in the stirring and dosing tank, the stirring and dosing tank is connected with the sedimentation tank through a second water through hole, a water outlet weir and an inclined plate filler are arranged in the sedimentation tank, the water outlet weir is above the inclined plate filler, the inclined plate filler is above the second water through hole, a water distribution pipe and filter material are arranged in the filter tank, the water distribution pipe is above the filter material and is connected with the water outlet weir, a plurality of water outlet holes are staggered on the water distribution pipe, the filter tank is connected with the water outlet tank through a third water through hole, the third water through hole is below the filter material, and the water outlet tank is connected with a drain pipe.

[0005] The utility model provides a device for removing iron and manganese from mine water, which performs aeration and alkali addition simultaneously, so that low-valent iron and manganese in the water are converted into precipitable substances, and main suspended solids in the water are removed by adding coagulant and stirring, and iron and manganese precipitates are taken out at the same time, and a gravity-type slow filter is used for filtration, which significantly reduces operating energy consumption, prolongs the service life of filter materials, and has good effects on removing suspended solids and iron and manganese. Brief Description of the Drawings

[0006] Figure 1 It is a schematic structural diagram of an iron and manganese removal device for mine water inrush.

[0007] The following further describes the present utility model in detail with reference to the drawings. Specific Embodiments

[0008] Refer to Figure 1 , the iron and manganese removal device for mine water inrush includes a pre-oxidation tank 1, a stirring and dosing tank 2, a sedimentation tank 3, a filtration tank 4, and an outlet tank 5 arranged in sequence. The water inlet pipe 6 is connected to the pre-oxidation tank 1, and raw water (mine water inrush) flows into the pre-oxidation tank 1 through the water inlet pipe 6. An aeration head 7 is provided at the bottom of the pre-oxidation tank 1, and the aeration head 7 is connected to an aeration blower 71 through an air pipe. The aeration blower 71 is used to oxygenate the raw water in the pre-oxidation tank 1 to realize the oxidation of iron and manganese ions. The alkali adding mechanism is used to add alkali agents to the pre-oxidation tank 1, including an alkali adding medicine barrel 11, an alkali adding pump 12, and an alkali adding pipe 13. The alkali adding medicine barrel 11 contains alkali agents, and the alkali agents are preferably lime milk or sodium hydroxide. The alkali adding pump 12 is connected to the alkali adding medicine barrel 11 through a water pipe. One end of the alkali adding pipe 13 is connected to the alkali adding pump 12, and the other end is communicated with the pre-oxidation tank 1. Starting the alkali adding pump 12 can add alkali agents into the pre-oxidation tank 1. The alkali agents are used to change the pH value of the raw water. Iron and manganese have better precipitation effects under weakly alkaline conditions. In order to monitor the pH value of the raw water in the pre-oxidation tank 1 to accurately adjust the pH value of the raw water in the pre-oxidation tank 1, a pH sensor (not shown in the figure) is provided in the pre-oxidation tank 1. Both the pH sensor and the alkali adding pump 12 are electrically connected to the control cabinet 8. The monitoring data of the pH sensor is sent to the control cabinet 8, and the control cabinet 8 controls the start, stop, and dosage of the alkali adding pump 12 according to the received data to realize automatic control of the dosing. After the raw water enters the pre-oxidation tank 1, it is aerated and pre-oxidized and the pH is adjusted to oxidize the low-valent iron and manganese in the water into high-valent ions. While the aeration head 7 conveys oxygen during aeration, the air flow plays a stirring role in the water, enabling the alkali agents to be fully mixed with the raw water. The oxidized iron and manganese ions can fully react with the alkali agents to generate substances that can precipitate, and these precipitable substances are removed in the subsequent sedimentation tank.

[0009] On the common pool wall of the pre-oxidation tank 1 and the mixing and dosing tank 2, there is a first water passing hole 102. The pre-oxidation tank 1 is connected to the mixing and dosing tank 2 through the first water passing hole 102. After the raw water undergoes aeration pre-oxidation and reaction in the pre-oxidation tank 1, it flows into the mixing and dosing tank 2 through the first water passing hole 102. The dosing mechanism is used to add coagulants to the mixing and dosing tank 2, including a coagulant dosing bucket 21, a coagulant dosing pump 22, and a coagulant dosing pipe 33. The coagulant dosing bucket 21 contains coagulants. The coagulants are preferably PAC, PFS, and PAM. The coagulant dosing pump 22 is connected to the coagulant dosing bucket 21 through a water pipe. One end of the coagulant dosing pipe 33 is connected to the coagulant dosing pump 22, and the other end communicates with the mixing and dosing tank 2. By starting the coagulant dosing pump 22, coagulants can be added into the mixing and dosing tank 2. A stirrer 24 is provided in the mixing and dosing tank 2 for stirring in the mixing and dosing tank 2. Since alkaline agents are added in the pre-oxidation tank 1 and the sewage is weakly alkaline, and coagulants are added in the mixing and dosing tank 2, the coagulants have better agent effects under weakly alkaline conditions. Under the stirring action of the stirrer, the suspended solids in the water are fully contacted with the coagulant agents, and the suspended solids and colloids in the water react with the agents. The main suspended solids in the water are removed by compressing the double electric layer and adsorbing and neutralizing the charges. At the same time, the generated flocs carry out a net-filling effect to carry out the iron and manganese precipitates out, and finally are removed by precipitation, solving the problem that the high content of suspended solids in the prior art clogs the sand filter tank.

[0010] On the common pool wall of the mixing and dosing tank 2 and the sedimentation tank 3, there is a second water passing hole 203. The mixing and dosing tank 2 is connected to the sedimentation tank 3 through the second water passing hole 203. The sewage flows from the mixing and dosing tank 2 into the sedimentation tank 3 through the second water passing hole 203. In the sedimentation tank 3, a weir 304, inclined plate fillers 31, and a sludge hopper 32 are arranged from top to bottom in sequence. The sludge hopper 32 is at the bottom of the sedimentation tank 3, and the inclined plate fillers 31 are above the second water passing hole 203. In the height position, the second water passing hole 203 is between the inclined plate fillers 31 and the sludge hopper 32. The sewage undergoes sedimentation in the sedimentation tank 3, and the sediment accumulates on the sludge hopper 32. The clarified water after sedimentation then passes through the inclined plate fillers 31 and enters the upper part of the inclined plate fillers 31 and then enters the weir 304.

[0011] A water distribution pipe 41 and filter media are arranged in the filtration tank 4. The water distribution pipe 41 is above the filter media and is communicated with the water outlet weir 304. A number of water outlet holes are arranged staggered on the water distribution pipe 41, and the diameter of the water outlet holes is 30 mm. The clear water after sedimentation in the sedimentation tank 3 flows into the water distribution pipe 41 from the water outlet weir 304 and is sprayed onto the filter media from the water outlet holes of the water distribution pipe 41. The filter media includes a filter media layer 43, a water distribution layer 44 and a supporting layer 45 arranged from top to bottom. For the raw water after pre-oxidation and sedimentation, most of the iron and suspended matters have been removed, but the removal effect of its manganese oxides is average. Therefore, the raw water continues to enter the filtration tank 4. The filtration tank 4 is a manganese sand filtration tank, and the removal of manganese ions is completed through manganese sand. Since the suspended matters in the sewage have been greatly reduced, the filtration tank 4 no longer adopts a conventional pressure filter, which has high energy consumption and serious erosion of the filter media at high filtration rates. In order to reduce energy consumption and extend the service life of the filter media, the filtration tank 4 adopts a slow filter.

[0012] A third water passing hole 405 is arranged on the common pool wall of the filtration tank 4 and the water outlet tank 5. The third water passing hole 405 is below the filter media. The filtration tank 4 is communicated with the water outlet tank 5 through the third water passing hole 405. The clear water filtered by the filter media enters the water outlet tank 5 through the third water passing hole 405. The water outlet tank 5 is communicated with the drain pipe 52, and the clear water in the water outlet tank 5 is discharged outward through the drain pipe 52.

[0013] The backwashing pump 9 is communicated with the water outlet tank 5 through the backwashing inlet pipe and with the filtration tank 4 through the backwashing outlet pipe. The outlet of the backwashing outlet pipe is below the filter media. Starting the backwashing pump 9 can backwash the filter media. The inlet end of the backwashing drain pipe 48 is communicated with the filtration tank 4 and is above the filter media, and the outlet end can be communicated with the stirring and dosing tank 2, the pre-oxidation tank 1 or the inlet pipe 6. A liquid level sensor 51 is arranged in the water outlet tank 5 to monitor the liquid level of the water outlet tank 5 to judge the timing of backwashing. When it is monitored that the liquid level has not changed significantly for 1 to 5 minutes, it means that the filter media needs to be backwashed. Open the backwashing pump to wash the filter media, and the backwashing water is discharged to the front end of the device through the backwashing drain pipe 48 for re-treatment. The control cabinet 8 is electrically connected to both the liquid level sensor 51 and the backwashing pump 9. The monitoring data of the liquid level sensor 51 is sent to the control cabinet 8, and the control cabinet 8 controls the start and stop of the backwashing pump 9 according to the monitoring data, and the automatic control of backwashing can be realized. After the previous treatment, the suspended matters in the water entering the filtration tank 4 have been significantly reduced, greatly reducing the frequency of backwashing and the treatment volume of the backwashing water, and extending the service life of the filter media.

[0014] The working process of the present utility model will be briefly described below in conjunction with the accompanying drawings. First, the mine groundwater enters the pre-oxidation tank through the water inlet pipe. The aeration fan is turned on, and the air-water ratio is 15:1. The amount of alkali added is adjusted according to the pH of the raw water to adjust the pH of the raw water to 8.0, and the residence time of the raw water is 15 minutes. Then, the raw water enters the stirring and dosing tank, where PAC medicament is added, and the dosage is 35 mg / L. At the same time, the stirrer stirs, and the residence time in this tank is 10 minutes. Next, the raw water enters the sedimentation tank, and the sedimentation time is 2 h. After sedimentation, the clear water enters the filtration tank through the water distribution pipe and is sprayed on the filter media. The filtration rate is 0.5 m / h. The clear water after filtration enters the water outlet tank and is finally discharged through the drain pipe. When the filtration has passed through several cycles and the liquid level in the water outlet section has not changed within 5 minutes, the backwashing pump is turned on. After uniform water distribution during backwashing, it has a good backwashing effect on the filter media.

[0015] The present utility model synchronizes aeration and alkali addition, making the low-valent iron and manganese in the water become precipitable substances. By adding a coagulant and stirring, the main suspended solids in the water are removed, and at the same time, the iron and manganese precipitates are carried out. Gravity slow sand filtration is adopted, which significantly reduces the operation energy consumption, prolongs the service life of the filter media, and has good removal effects on suspended solids, iron and manganese. The present utility model can achieve the removal of iron, manganese and suspended solids. After treatment, the iron content in the water is less than 0.5 mg / l, the manganese content is less than 0.3 mg / l, and the removal rate of suspended solids can reach more than 85%. The present utility model has low energy consumption, a long service life of the filter media, and good iron and manganese removal effects.

Claims

1. An iron and manganese removal device for mine water inrush, characterized in that, It includes a pre-oxidation tank, a stirring and dosing tank, a sedimentation tank, a filtration tank and an effluent tank arranged in sequence, and also includes an alkali adding mechanism for adding alkali agents to the pre-oxidation tank and a dosing mechanism for adding coagulants to the stirring and dosing tank. The pre-oxidation tank is connected to the inlet pipe and the stirring and dosing tank. An aeration head is arranged in the pre-oxidation tank, and the aeration head is connected to an aeration blower. A stirrer is arranged in the stirring and dosing tank. The stirring and dosing tank is connected to the sedimentation tank through a second water passing hole. An effluent weir and inclined plate fillers are arranged in the sedimentation tank. The effluent weir is above the inclined plate fillers, and the inclined plate fillers are above the second water passing hole. A water distribution pipe and filter media are arranged in the filtration tank. The water distribution pipe is above the filter media and is connected to the effluent weir. A number of water outlet holes are arranged in a staggered manner on the water distribution pipe. The filtration tank is connected to the effluent tank through a third water passing hole. The third water passing hole is below the filter media. The effluent tank is connected to a drain pipe.

2. The iron and manganese removal device for mine water inflow according to claim 1, characterized in that, It also includes a backwashing pump. The backwashing pump is connected to the effluent tank through a backwashing inlet pipe and to the filtration tank through a backwashing outlet pipe. The outlet of the backwashing outlet pipe is below the filter media.

3. The iron and manganese removal device for mine water inflow according to claim 2, characterized in that, It also includes a control cabinet and a liquid level sensor. The liquid level sensor is arranged in the effluent tank. The control cabinet is electrically connected to both the liquid level sensor and the backwashing pump.

4. The iron and manganese removal device for mine water in accordance with claim 3, wherein, A pH sensor is arranged in the pre-oxidation tank, and the pH sensor is electrically connected to the control cabinet.

5. The iron and manganese removal device for mine water inflow according to claim 4, characterized in that, The alkali adding mechanism includes an alkali adding medicine barrel, an alkali adding pump and an alkali adding pipe. The alkali adding medicine barrel contains alkali agents. The alkali adding pump is connected to the alkali adding medicine barrel through a water pipe. One end of the alkali adding pipe is connected to the alkali adding pump, and the other end is connected to the pre-oxidation tank. The alkali adding pump is electrically connected to the control cabinet.

6. The iron and manganese removal device for mine water inflow according to claim 5, characterized in that, It also includes a backwashing drain pipe. The inlet end of the backwashing drain pipe is connected to the filtration tank and is above the filter media.

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