CN115072902A - System and process for efficiently removing iron and manganese metal ions in acid mine wastewater - Google Patents
System and process for efficiently removing iron and manganese metal ions in acid mine wastewater Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C02F1/00—Treatment of water, waste water, or sewage
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- C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
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- C02F2101/00—Nature of the contaminant
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- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/203—Iron or iron compound
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/206—Manganese or manganese compounds
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- C—CHEMISTRY; METALLURGY
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention provides a process for efficiently removing iron and manganese metal ions in acid mine wastewater, which belongs to the technical field of wastewater treatment and comprises the following steps: adjusting the water quantity and water quality of the acid mine wastewater, adding calcium hydroxide for primary precipitation, and performing solid-liquid separation to obtain primary wastewater; adding carbide slag into the primary wastewater after aeration oxidation treatment for secondary precipitation, and performing solid-liquid separation to obtain secondary wastewater; the secondary wastewater is aerated and then sequentially filtered by a manganese sand filter material and a zeolite filter material, and the filtered wastewater can be discharged after reaching the standard through detection; the method adopts the method of 'calcium hydroxide-carbide slag' secondary precipitation, natural manganese sand contact oxidation and natural zeolite adsorption filtration to remove high-concentration iron and manganese ions, so that the concentration of the iron and manganese ions in the final discharged water meets the national coal industry pollutant discharge standard.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a system and a process for efficiently removing iron and manganese metal ions in acid mine wastewater.
Background
During mining, ore dressing, tailing treatment and slag discharge, a large amount of waste water is discharged or leached out in a Mine field to form Acid Mine Drainage (AMD). AMD pH value is generally less than 5, and contains a large amount of iron, manganese metal salt substances, and iron, manganese ion as the important monitoring item in AMD, the state has strict standards for its emission concentration. At present, the iron and manganese metals are mainly treated by an ion exchange method and a membrane separation method, but the two treatment methods require continuous regeneration or replacement of resin and active filter membranes, which causes great increase of treatment cost, so that the two treatment technologies are difficult to apply to large-scale AMD treatment. Biological methods commonly used in water treatment also present a number of problems in the treatment of AMD, one being that the screening of desirable strains is complicated and increases the investment in earlier projects. Secondly, the living conditions of the microorganisms are harsh, and because the components of AMD are complex, the problem of tolerance of certain microorganisms to other substances in AMD needs to be researched before the microorganisms are applied. The single addition of alkaline reagents such as lime, potassium hydroxide and the like into AMD is simple to operate, but the effluent is often unstable, the removal effect on iron and manganese in AMD is not good, a large amount of sludge is generated, and the treatment cost is increased.
Disclosure of Invention
Aiming at the problems, the invention provides a system and a process for efficiently removing iron and manganese metal ions in acid mine wastewater, which are used for treating AMD containing high-concentration iron and manganese metal ions, improving the removal rate of the iron and manganese metal ions while reducing the treatment cost, and keeping the removal rate of the iron and manganese ions in a stable state, so that the concentration of the iron and manganese in effluent reaches the requirements of GB 20426-2006 discharge Standard for pollutants for the coal industry.
The purpose of the invention is realized by adopting the following technical scheme:
a process for efficiently removing iron and manganese metal ions in acid mine wastewater comprises the following steps:
(1) adding calcium hydroxide into the acidic mine wastewater after adjusting the water quantity and the water quality, fully stirring and reacting, and then carrying out solid-liquid separation to respectively obtain a sediment and primary wastewater; the water quantity regulation is specifically to regulate the inflow water quantity of the acid mine wastewater, and the water quality regulation is specifically to reduce the content of suspended substances and other heavy metals in the wastewater, and can be realized by adding a coagulant so as to quickly regulate the turbidity, the chromaticity, the hardness and the like of the inflow water;
(2) adding carbide slag into the primary wastewater after aeration oxidation treatment, fully stirring for reaction, and performing solid-liquid separation to obtain sludge and secondary wastewater;
(3) the secondary wastewater is sequentially filtered by the manganese sand filter material and the zeolite filter material, and the filtered wastewater can be discharged after reaching the standard through detection.
As a preferred embodiment of the invention, the stirring reaction time of the step (1) is 30-50min, and the hydraulic retention time is not less than 3 h.
As a preferable embodiment of the present invention, the time of the aeration oxidation treatment in the step (2) is 30-45 min.
As a preferred embodiment of the invention, the stirring reaction time of the step (2) is 10-20min, and the hydraulic retention time is not less than 1 h.
As a preferred embodiment of the invention, the manganese sand filter material in the step (3) is natural manganese sand with the particle size of 1-2mm, MnO 2 The content is 40%, and the zeolite filter material is natural zeolite with a particle size of 0.5-1 mm.
The invention also aims to provide a system for efficiently removing iron and manganese metal ions in the acid mine wastewater based on the process, which comprises a water inlet adjusting tank, a calcium hydroxide sedimentation tank, a carbide slag sedimentation tank, a filtering tank and a sludge tank, wherein the bottoms of the water inlet adjusting tank, the calcium hydroxide sedimentation tank, the carbide slag sedimentation tank and the filtering tank are sequentially communicated hydraulically; the calcium hydroxide sedimentation tank consists of a primary sedimentation tank and an aeration tank, and the primary sedimentation tank and the aeration tank are separated by a flow baffle; a first stirring device is arranged in the primary sedimentation tank, and an aeration hole is formed in the bottom of the aeration tank; a second stirring device is arranged in the carbide slag sedimentation tank; the filter tank sequentially comprises an aeration hole, a manganese sand filter material layer and a zeolite filter material layer from bottom to top; and the bottom parts of the primary sedimentation tank and the carbide slag sedimentation tank are respectively provided with a sludge storage hopper and a sludge scraping plate, and the sludge storage hoppers are respectively in hydraulic communication with the sludge tank.
As a preferred embodiment of the present invention, a filter screen is disposed between the carbide slag settling tank and the filtering tank.
As a preferred embodiment of the invention, the primary sedimentation tank is provided with a calcium hydroxide adding port; the carbide slag sedimentation tank is provided with a carbide slag inlet.
As a preferred embodiment of the present invention, the water outlet of the inlet adjusting tank, the primary sedimentation tank, the aeration tank, the carbide slag sedimentation tank or the filtration tank is provided with a monitoring device, and the monitoring device is used for monitoring the pH, the iron ion concentration, the manganese ion concentration and the like of the outlet water of each unit, so as to adjust and control the reaction time and the adding amount of the medicine in time.
The specific processing principle of the removing system is as follows: the acid mine wastewater is firstly discharged into a water inlet adjusting tank from a water collecting pipe, the water quantity and the water quality of the wastewater are adjusted in the adjusting tank, when the water quantity reaches the water storage level of the adjusting tank, the wastewater is discharged into a calcium hydroxide sedimentation tank, a certain amount of calcium hydroxide is added into the calcium hydroxide sedimentation tank, wherein the calcium hydroxide can adjust the pH value of the acid mine wastewater, and the calcium hydroxide contains a large amount of OH - A large amount of iron ions and manganese ions in the acid mine wastewater can react with OH - The reaction produced green Fe (OH) 2 Flocs and white Mn (OH) 2 In order to fully react, a stirring device can be arranged in the calcium hydroxide sedimentation tank, the water body is continuously stirred during the reaction, the reaction lasts for 30-50min, and the hydraulic retention time is 3hAfter the treatment, the sludge scraper can collect the deposited floccule and the sludge generated by mixing in a sludge storage hopper, and then convey the sludge to a sludge tank through a pipeline; after the sedimentation is finished, the flow baffle plate is opened, the wastewater after the primary sedimentation flows into the aeration tank and is aerated for about 30min, so that ferrous ions remained in the wastewater can be oxidized into Fe 3+ So that the material has better settleability in the subsequent treatment process; discharging the waste water into a carbide slag sedimentation tank after aeration, adding a certain amount of carbide slag into the carbide slag sedimentation tank, wherein the carbide slag is used as alkaline industrial waste, contains more than 60 percent of CaO, can obviously raise the pH value of the waste water by dissolving in water, and contains a small amount of SiO 2 、Al 2 O 3 MgO, and the like, which when dissolved in water, also react with OH-in the solution to form Al (OH) 3 And Mg (OH) 2 The flocculating constituents can generate good adsorption effect in the solution and have flocculation effect on the iron and manganese ions which are not settled in the solution; the carbide slag is used for treating the acid mine wastewater, so that the ferro-manganese ions in the acid mine wastewater can generate a better sedimentation effect, and the aims of treating wastes with processes of wastes against one another and saving cost can be fulfilled. In order to ensure the full reaction, a mechanical stirring device is also used for stirring the wastewater continuously; after the reaction is carried out for 10-20min and the hydraulic retention time is more than 1h, collecting the deposited carbide slag and flocculent sludge in a sludge storage hopper by a mud scraper at the bottom of the carbide slag sedimentation tank, and then conveying the sludge to a sludge tank through a pipeline; because some tiny impurity particles in the carbide slag are insoluble in water and can be suspended in the wastewater to be difficult to settle, a layer of filter screen can be sealed at the pipe orifice connected with the filter tank to filter out the suspended particles in the wastewater, so that the influence of the pipeline blockage on the next reaction is avoided; acid mine wastewater is discharged into a filter tank, natural manganese sand is filled in the lower part of the filter tank, natural zeolite is filled in the upper part of the filter tank, the wastewater enters from the lower part of the tank and enters a filter material layer after passing through aeration holes, and water enters from the lower part of the filter tank, so that the wastewater and the filter material in the tank have larger contact area, and the reaction is more sufficient; under the action of aeration, iron ions and manganese ions are oxidized and attached to the surface of the manganese sand filter material, and high-valence iron and manganese ions are formed on the surface of the filter materialThe oxide will form iron filter membrane and manganese filter membrane with catalytic activity along with the reaction, the component of the filter membrane is Fe (OH) 3 ·2H 2 O and MnO 2 The residual ferro-manganese in the solution can be adsorbed by the filter membrane, a series of complex oxidation processes can occur under the catalytic action of the ferro-manganese active filter membrane to achieve the aim of removing the ferro-manganese in the solution, the active filter membrane can be continuously generated in the reaction process to achieve the aim of continuous operation, the natural zeolite has a frame structure, a plurality of cavities are formed in the natural zeolite, and the specific surface area is large (400-800 m) 2 The filter material has strong ion exchange performance, has more adsorption sites even if not modified, has a certain adsorption effect on iron and manganese ions in water, and is used as another filter material for treating iron and manganese ions in acid mine wastewater; the reaction time of the acidic mine wastewater and the filter material is not less than 2 hours, and the filtered wastewater can be discharged after reaching the standard through detection.
The invention has the beneficial effects that:
the invention provides a system and a process for efficiently removing iron and manganese ions in acid mine wastewater, which remove high-concentration iron and manganese ions by adopting a method of 'calcium hydroxide-carbide slag' secondary precipitation, natural manganese sand contact oxidation and natural zeolite adsorption filtration, so that the concentration of the iron and manganese ions in final discharged water meets the national coal industry pollutant discharge standard. The invention uses the industrial waste carbide slag as a precipitation material during secondary precipitation, not only improves the precipitation and removal efficiency of iron and manganese ions based on the special property of the carbide slag, but also achieves the purpose of treating waste by waste, and provides a new idea for the engineering treatment of acid mine wastewater.
According to the invention, natural manganese sand and natural zeolite are used for filtering acid mine wastewater in a post-treatment process, an active filter membrane continuously formed on the surface of the natural manganese sand can continuously oxidize iron and manganese ions in the wastewater to enable the iron and manganese ions to be oxidized into high-order oxides to be attached to the surface of the filter membrane, so that the stability of effluent indexes is ensured, the natural zeolite also has a large specific surface area, the residual iron and manganese ions can be fully adsorbed, so that a better treatment effect is achieved, and the two filter materials can be recycled, so that the energy is saved, and the problem of excessive material consumption is solved.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a schematic flow chart of the process for efficiently removing iron and manganese metal ions in acid mine wastewater according to the invention;
FIG. 2 is a schematic structural diagram of a system for efficiently removing iron and manganese metal ions in acid mine wastewater according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a filtration tank according to an embodiment of the present invention.
Reference numerals: 1-acid mine wastewater inlet; 2-a water inlet adjusting tank; 3-calcium hydroxide inlet; 4-a first stirring device; 5-a first-stage sedimentation tank; 6-flow baffle; 7-an aeration tank; 8-aeration holes; 9-a mud scraper; 10-a mud storage hopper; 11-carbide slag inlet; 12-carbide slag sedimentation tank; 13-filtering with a filter screen; 14-a filtration tank; 15-natural manganese sand filter material; 16-natural zeolite filter material; 17-a water outlet; 18-sludge tank; 19-second stirring device.
Detailed Description
The invention is further described in connection with the following examples.
The embodiment of the invention relates to a system for efficiently removing iron and manganese metal ions in acid mine wastewater, which comprises a water inlet adjusting tank 2, a calcium hydroxide sedimentation tank, a carbide slag sedimentation tank 12, a filtering tank 14 and a sludge tank 18, wherein the bottoms of the water inlet adjusting tank 2, the calcium hydroxide sedimentation tank, the carbide slag sedimentation tank 12 and the filtering tank 14 are communicated in sequence through pipelines; the water inlet adjusting tank 2 is provided with an acid mine wastewater inlet 1, the calcium hydroxide sedimentation tank consists of a primary sedimentation tank 5 and an aeration tank 7, the primary sedimentation tank 5 and the aeration tank 7 are separated by a flow baffle 6, the primary sedimentation tank 5 is provided with a calcium hydroxide inlet 3, the primary sedimentation tank 5 is internally provided with a first stirring device 4, and the bottom of the aeration tank 7 is provided with an aeration hole 8; the carbide slag sedimentation tank 12 is internally provided with a carbide slag feeding port 11 and a second stirring device 19; the filter tank 14 sequentially comprises an aeration hole 8, a natural manganese sand filter material 15 and a natural zeolite filter material 16 from bottom to top, a water outlet 17 is formed in the upper end of the filter tank 14, a filter screen 13 is arranged between the carbide slag sedimentation tank 12 and the filter tank 14, a sludge storage hopper 10 and a sludge scraping plate 9 are arranged at the bottoms of the primary sedimentation tank 5 and the carbide slag sedimentation tank 12, and the sludge storage hopper 10 is communicated with the sludge tank 18 through a pipeline.
When the system is operated, acid mine wastewater enters a water inlet adjusting tank 2 from an acid mine wastewater inlet 1, stays for a period of time, enters a primary sedimentation tank 5 through a pipeline, calcium hydroxide is added into the primary sedimentation tank 5 through a calcium hydroxide inlet 3 to react with AMD, a first stirring device is used for stirring during the reaction, after the reaction is finished and a flocculating constituent is settled down, a flow baffle 6 is opened to enable the wastewater after the reaction to enter an aeration tank 7, sludge generated is collected into a sludge storage hopper 10 through a sludge scraper 9, the sludge enters the aeration tank 7 through an aeration hole 8 after being opened for about 30min, then the aerated wastewater is conveyed to a carbide slag sedimentation tank 12 through a pipeline, carbide slag is added into the carbide slag sedimentation tank 12 through a carbide slag inlet 11 for treatment, a second stirring device 19 is used for stirring continuously during the reaction process, and after the reaction is finished, sludge generated in the carbide slag sedimentation tank 12 is collected into a sludge storage hopper 10 by a sludge scraper 9, sludge in the same-stage sedimentation tank 5 is conveyed to a sludge tank 18 through a pipeline, AMD reacted in the carbide slag sedimentation tank 12 enters a filter tank 14 through a filter screen 13 and reacts with a natural manganese sand filter material 15 and a natural zeolite filter material 16 from bottom to top, aeration is carried out through an aeration hole 8 continuously during the reaction, the reaction time is more than 2 hours, and finally water is discharged from a water outlet 17; furthermore, the lower part of the water inlet adjusting tank 2 is communicated with the upper part of the primary sedimentation tank 5 through a pipeline, the wastewater enters the primary sedimentation tank 5 from the lower part of the water inlet adjusting tank 2, the wastewater settled in the primary sedimentation tank 5 is controlled to enter the aeration tank 7 for aeration treatment by controlling the opening and closing of the flow baffle 6 on the partition wall, the wastewater subjected to aeration in the aeration tank 7 enters from the lower part of the aeration tank 7 through the upper part of the carbide slag sedimentation tank 12 through a pipeline, the wastewater after reaction enters from the lower part of the carbide slag sedimentation tank 12 through a 800-mesh filter screen into the lower part of the filter tank 14 and is filtered through a natural manganese sand filter material 15 and a natural zeolite filter material 16 from bottom to top, sludge generated at the bottom of the tank is periodically cleaned by the primary sedimentation tank 5 and a sludge scraper 9 in the carbide slag sedimentation tank 12, the sludge is collected by a sludge storage hopper 10 and is discharged into a sludge tank 18 through a pipeline for next treatment.
The embodiment of the invention utilizes the system to treat the mine hole water burst generated by a certain abandoned coal mine in Anlong county of the autonomous city of the Miao nations of the Miao nationality of the Guizhou, Qian, West province, and the main unqualified factors in the acid mine waste water are iron, manganese, pH and chromaticity.
The system is designed to process 80m 3 And d, the sizes of all units of the treatment system are as follows: 4m multiplied by 2.5m of a water inlet adjusting tank, 3m multiplied by 02.2m multiplied by 12.5m of a primary sedimentation tank (containing a mud storage hopper and a mud scraping plate), 3m multiplied by 2.2m multiplied by 2.5m of an aeration tank (containing a bottom aeration device), 3.5m multiplied by 2m multiplied by 2.5m of a carbide slag sedimentation tank (containing a mud storage hopper and a mud scraping plate), 4.5m multiplied by 3m of a filter tank (containing two filter fillers and a row of aeration devices), and 5.5m multiplied by 4m multiplied by 3m of a sludge tank; wherein the diameter of an aeration hole in the aeration tank is 20cm, and the volume filled with the natural manganese sand filter material in the filter tank is 18-25m 3 The volume of the natural zeolite filter material is 8-14m 3 The diameter of an aeration hole in the filter tank is 15 cm; the filtering materials in the filtering tank use 40 percent of natural manganese sand filtering materials with the grain diameter of 1-2mm and natural zeolite filtering materials with the grain diameter of 0.5-1 mm.
Example 1
The acid mine wastewater to be treated passes through the system and is treated by the following steps and processes:
s1: opening a valve, allowing the acid mine wastewater to enter a primary sedimentation tank through the adjustment of a water inlet adjusting tank through an acid mine wastewater inlet, adding 15kg of calcium hydroxide into the acid mine wastewater through a calcium hydroxide inlet, and reacting for 50 min;
s2: controlling the supernatant to flow into an aeration tank after the sedimentation is finished, and aerating the aeration tank for 20 min;
s3: introducing the water subjected to aeration into a carbide slag sedimentation tank, and adding 4.2kg of carbide slag to react for 20 min;
s4: after settling, the mixture enters a filter tank through a 800-mesh filter screen and passes through 22m 3 Volume of natural manganese sand and 12m 3 Filtering the natural zeolite by volume;
s5: and opening a water outlet, and discharging the treated acidic wastewater out of the system.
Example 2
The acid mine wastewater to be treated passes through the system and is treated by the following steps and processes:
s1: opening a valve, allowing the acid mine wastewater to enter a primary sedimentation tank through the adjustment of a water inlet adjusting tank through an acid mine wastewater inlet, adding 15kg of calcium hydroxide into the acid mine wastewater through a calcium hydroxide inlet, and reacting for 50 min;
s2: controlling the supernatant to flow into an aeration tank after the sedimentation is finished, and aerating the aeration tank for 20 min;
s3: introducing the water subjected to aeration into a carbide slag sedimentation tank, and adding 5.6kg of carbide slag to react for 20 min;
s4: after sedimentation, the mixture enters a filter tank through a filter screen of 800 meshes and passes through 22m 3 Volume of natural manganese sand and 12m 3 Filtering the natural zeolite by volume;
s5: and opening a water outlet, and discharging the treated acidic wastewater out of the system.
Example 3
The acid mine wastewater to be treated passes through the system and is treated by the following steps and processes:
s1: opening a valve, allowing the acid mine wastewater to enter a primary sedimentation tank through the adjustment of a water inlet adjusting tank through an acid mine wastewater inlet, adding 15kg of calcium hydroxide into the acid mine wastewater through a calcium hydroxide inlet, and reacting for 50 min;
s2: controlling the supernatant to flow into an aeration tank after the sedimentation is finished, and aerating the aeration tank for 20 min;
s3: introducing the water after aeration into a carbide slag sedimentation tank, and adding 4.2kg of carbide slag to react for 20 min;
s4: after settling, the mixture enters a filter tank through a 800-mesh filter screen and passes through18m 3 Volume of natural manganese sand and 8m 3 Filtering the natural zeolite by volume;
s5: and opening a water outlet, and discharging the treated acidic wastewater out of the system.
Example 4
The acid mine wastewater to be treated passes through the system and is treated by the following steps and processes:
s1: opening a valve, allowing the acid mine wastewater to enter a primary sedimentation tank through the adjustment of a water inlet adjusting tank through an acid mine wastewater inlet, adding 15kg of calcium hydroxide into the acid mine wastewater through a calcium hydroxide inlet, and reacting for 50 min;
s2: controlling the supernatant to flow into an aeration tank after the sedimentation is finished, and aerating the aeration tank for 20 min;
s3: introducing the water subjected to aeration into a carbide slag sedimentation tank, and adding 4.2kg of carbide slag to react for 20 min;
s4: after settling, the mixture enters a filter tank through a filter screen of 800 meshes and passes through 25m 3 Volume of natural manganese sand and 14m 3 Filtering the natural zeolite by volume;
s5: and opening a water outlet, and discharging the treated acidic wastewater out of the system.
The acid mine wastewater discharged from examples 1 to 4 was measured using a Shanghai Reye pHS-2F type precision acid-base indicator (instrument measurement range 0.00 to 14, measurement precision. + -. 0.05), total iron and total manganese in the treated wastewater were measured by a Shanghai Jingke instrument electric score AA320N Plus flame atomic absorption spectrophotometer (wavelength range 190nm to 900nm), the removal rate of ferromanganese after system treatment and the remaining amount of ferromanganese in the discharged wastewater were calculated, and the measurement results are shown in the following table:
| example 1 | Example 2 | Example 3 | Example 4 | |
| pH of influent | 3.68 | 3.68 | 3.68 | 3.68 |
| Total iron concentration (mg/L) of influent | 800 | 800 | 800 | 800 |
| Total manganese concentration (mg/L) of feed water | 60 | 60 | 60 | 60 |
| pH of the effluent | 7.48 | 8.75 | 7.32 | 6.93 |
| Total iron removal (%) | 99.9 | 98.9 | 97.58 | 95.42 |
| Total iron concentration (mg/L) of effluent | 0.8 | 8.8 | 19.36 | 36.64 |
| Total manganese removal (%) | 98.9 | 96.83 | 95.53 | 94.23 |
| Total manganese concentration (mg/L) of effluent | 0.66 | 1.902 | 2.682 | 3.462 |
It can be seen that the effluent pH of each example is rising after the system treatment of the embodiment of the invention, which shows that the system and the process of the invention can obviously improve the pH of the acid mine wastewater; after the acid mine wastewater containing high-concentration iron and manganese is treated by the system of the embodiment of the invention, the comparison of the four groups of examples shows that the treatment effect of the embodiment 1 is obviously better than that of the other three groups of embodiments, the concentration of iron ions in effluent is 0.8mg/L, the concentration of manganese ions is 0.66mg/L, the comprehensive treatment efficiency is 99.9 percent of iron ions, and the manganese ions are 98.9 percent; the concentration of iron and manganese ions in the effluent can meet the requirements of GB 20426-2006 discharge Standard for pollutants for the coal industry, which shows that the invention can achieve high efficiency on the removal of pH and total iron and total manganese in the acidic mine wastewater.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. A process for efficiently removing iron and manganese metal ions in acid mine wastewater is characterized by comprising the following steps:
(1) adding calcium hydroxide into the acidic mine wastewater after adjusting the water quantity and the water quality, fully stirring and reacting, and then carrying out solid-liquid separation to respectively obtain a sediment and primary wastewater;
(2) adding carbide slag into the primary wastewater after aeration oxidation treatment, fully stirring for reaction, and performing solid-liquid separation to obtain sludge and secondary wastewater;
(3) the secondary wastewater is sequentially filtered by the manganese sand filter material and the zeolite filter material, and the filtered wastewater can be discharged after reaching the standard through detection.
2. The process for efficiently removing the iron and manganese metal ions in the acid mine wastewater according to claim 1, wherein the stirring reaction time in the step (1) is 30-50min, and the hydraulic retention time is not less than 3 h.
3. The process for efficiently removing the iron and manganese metal ions in the acid mine wastewater according to claim 1, wherein the time of the aeration oxidation treatment in the step (2) is 30-45 min.
4. The process for efficiently removing the iron and manganese metal ions in the acid mine wastewater according to claim 1, wherein the stirring reaction time in the step (2) is 10-20min, and the hydraulic retention time is not less than 1 h.
5. The process for efficiently removing the iron and manganese metal ions in the acid mine wastewater according to claim 1, wherein the manganese sand filter material in the step (3) is natural manganese sand with the particle size of 1-2mm, MnO 2 The content is 40%, and the zeolite filter material is natural zeolite with a particle size of 0.5-1 mm.
6. The system for efficiently removing iron and manganese metal ions in acid mine wastewater is characterized by comprising a water inlet adjusting tank, a calcium hydroxide sedimentation tank, a carbide slag sedimentation tank, a filtering tank and a sludge tank, wherein the bottoms of the water inlet adjusting tank, the calcium hydroxide sedimentation tank, the carbide slag sedimentation tank and the filtering tank are sequentially communicated hydraulically; the calcium hydroxide sedimentation tank consists of a primary sedimentation tank and an aeration tank, and the primary sedimentation tank and the aeration tank are separated by a flow baffle; a first stirring device is arranged in the primary sedimentation tank, and an aeration hole is formed in the bottom of the aeration tank; a second stirring device is arranged in the carbide slag sedimentation tank; the filter tank sequentially comprises an aeration hole, a manganese sand filter material layer and a zeolite filter material layer from bottom to top; and the bottom parts of the primary sedimentation tank and the carbide slag sedimentation tank are respectively provided with a sludge storage hopper and a sludge scraping plate, and the sludge storage hoppers are respectively in hydraulic communication with the sludge tank.
7. The system for efficiently removing iron and manganese metal ions in acid mine wastewater according to claim 6, wherein a filter screen is arranged between the carbide slag sedimentation tank and the filter tank.
8. The system for efficiently removing the iron and manganese metal ions in the acid mine wastewater according to claim 6, wherein the primary sedimentation tank is provided with a calcium hydroxide inlet; the carbide slag sedimentation tank is provided with a carbide slag feeding port.
9. The system for efficiently removing the iron and manganese metal ions in the acid mine wastewater according to claim 6, wherein a monitoring device is arranged at a water outlet of the water inlet adjusting tank, the primary sedimentation tank, the aeration tank, the carbide slag sedimentation tank or the filtering tank.
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