CN110981017A - Method for treating acidic iron-containing wastewater - Google Patents
Method for treating acidic iron-containing wastewater Download PDFInfo
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- CN110981017A CN110981017A CN201911327966.5A CN201911327966A CN110981017A CN 110981017 A CN110981017 A CN 110981017A CN 201911327966 A CN201911327966 A CN 201911327966A CN 110981017 A CN110981017 A CN 110981017A
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- C—CHEMISTRY; METALLURGY
- 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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- C—CHEMISTRY; METALLURGY
- 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
- C02F1/52—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
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/203—Iron or iron compound
Abstract
The invention provides a method for treating acidic iron-containing wastewater, which comprises the following steps: carrying out pH value pre-adjustment on the acidic iron-containing wastewater by dolomite; aerating the wastewater after the pH value is adjusted; carrying out primary precipitation on the aerated wastewater; reacting the primary precipitate effluent through a dolomite reaction bed; carrying out mud-water separation on effluent after the dolomite reaction; adjusting the pH value of the effluent after mud-water separation by using dolomite, then carrying out solid-liquid separation, and discharging the effluent. The pH value of the wastewater treated and clarified by the method is 6-9, the iron concentration is lower than 2mg/L, the wastewater meets the treatment requirement, and the wastewater can be directly discharged; compared with the prior art, the waste residue generated by the treatment method is reduced by more than half, and the subsequent treatment difficulty is reduced.
Description
Technical Field
The invention relates to a wastewater treatment process, in particular to a treatment method of acidic iron-containing wastewater.
Background
With the rapid development of social economy, the living standard of people is greatly improved, but the people also face more and more serious environmental pollution problems. The water environment pollution, the air pollution, the farmland soil pollution and the like affect the health of people at any moment. Taking water body pollution as an example, the iron content of the acidic iron-containing wastewater discharged from factories or coal iron mines is very high, the acidic iron-containing wastewater is discharged into a natural water body, the generated trivalent ferric hydroxide has very strong adsorption capacity, a plurality of pollutants are adsorbed in rivers and gradually subside to the bottom of the water body in a zone with slow flow velocity, under the anoxic condition of the bottom of the water body, the trivalent ferric hydroxide is reduced into soluble divalent iron due to biological action, and other pollutants enter the water body again. When the concentration of iron in water is too high, the sensory properties of water such as color, smell, taste and the like are influenced, so that the water body is red-orange and turbid, and the dissolved oxygen in water is rapidly reduced. For human body, the phenomenon of inappetence, intestinal disorder, diarrhea and the like can be caused by drinking too much high-iron content liquid. So that the molten iron must be purified before being discharged.
The traditional method for treating the acidic iron-containing wastewater comprises a lime method, a sodium hydroxide method, a high-concentration mud slurry method, a microbiological method, a sodium sulfide method and the like, but has the defects of limited sources, large slag amount, high cost, complex process and the like. For example, CN101857325A discloses a method for treating acidic iron-containing wastewater, which comprises: the acidic iron-containing wastewater (the acidic iron-containing wastewater generated in the production of titanium dioxide by a sulfuric acid method has a pH value of 1.33-1.82 and contains Fe2+1840-2260 g/L) and carbide slag slurry or lime milk are subjected to neutralization reaction in a neutralization tank through mechanical mixing; the neutralized slag-containing wastewater enters a sedimentation tank; the supernatant wastewater of the sedimentation tank enters a wastewater oxidation tank, a small amount of acidic iron-containing wastewater is used for pH value adjustment in a pH value adjustment area of the wastewater oxidation tank, and then enters an aeration area for oxidation; the wastewater containing a small amount of high-iron suspended matters enters a clarification tank, and clarified clear wastewater is directly discharged; and (4) pumping and sucking the bottom sludge deposited in the sedimentation tank II and the clarification tank IV to a bottom sludge oxidation tank, carrying out aeration oxidation treatment, then sending to a filter press for filtering, returning filtered water to the wastewater oxidation tank to be treated together with supernatant wastewater from the sedimentation tank, and treating filter residues according to a traditional method. The method is maximalThe method has the disadvantages of generating a large amount of iron hydroxide sludge, being difficult to reprocess, occupying land for landfill treatment, and causing secondary solid waste pollution and resource waste. In addition, the treatment effect of lime and the like used in the method after repeated use is obviously reduced.
Disclosure of Invention
The invention aims to solve the problem of providing a method for treating acidic iron-containing wastewater, which can effectively reduce the concentration of iron in the treated wastewater, greatly reduce the generation amount of waste residues, reduce environmental pollution and reduce resource waste.
In order to achieve the above object, the present invention provides a method for treating acidic iron-containing wastewater, comprising the steps of:
1) carrying out pH value pre-adjustment on the acidic iron-containing wastewater by dolomite;
2) aerating the wastewater with the preset pH value;
3) carrying out primary precipitation on the aerated wastewater;
4) reacting the primary precipitate effluent through a dolomite reaction bed;
5) carrying out mud-water separation on effluent after the dolomite reaction;
6) adjusting the pH value of the effluent after mud-water separation by using dolomite, then carrying out solid-liquid separation, and discharging the effluent.
Preferably, the step 1) of pre-adjusting the pH value of the acidic wastewater containing iron by passing through dolomite comprises the following steps: the acidic wastewater containing iron is sent into a pH value pre-adjusting tank provided with (laid and/or filled with) dolomite, the acidic wastewater containing iron is contacted with the dolomite, and the pH value of the acidic wastewater containing iron can be adjusted to be more than 3, preferably 3-3.5 by controlling the set amount of the dolomite and the flow rate of the wastewater. In the preferred technical scheme, the pH value of the wastewater is high before the wastewater is aerated, and Fe in the subsequent reaction can be accelerated2+The oxidation rate of (2).
According to the present invention, the aeration in step 2) may be performed by various aeration methods known in the art, and preferably, step 2) is aerated by a drop aeration method. In the preferred technical scheme, through the potential difference of the earthWithout consuming extra energy to the Fe in the wastewater2+And the pre-oxidation treatment is carried out, so that the subsequent treatment load is reduced.
More preferably, dolomite with the grain diameter of 4-6cm is paved in the aeration field used in the drop aeration mode, and the volume of the dolomite accounts for 95-100% of the volume of the aeration field. In the preferred technical scheme, the wastewater with the preset pH value is aerated in an aeration field provided with dolomite, so that the pH value of the wastewater is further improved, and the burden of a subsequent process can be further reduced. The laying mode of the dolomite is flat laying, and one layer or a plurality of layers can be laid.
Preferably, the pH value of the effluent subjected to the primary precipitation in the step 3) is controlled to be 3.8-4.3. In the preferred technical scheme, the pH value of the primary precipitation effluent can be controlled by adding sodium hydroxide solution. In addition, the water quantity can be controlled by adjusting the primary sedimentation tank, if the water quantity is larger in rainy seasons, the water quantity is homogenized by the adjusting tank, and the load of the rear unit is reduced.
Specifically, in the step 4), a dolomite filler is filled in the dolomite reaction bed, the grain diameter of the filler is 4-6cm, and the volume of the filler accounts for 80-90% of the volume of the dolomite reaction bed. The primary precipitation effluent is reacted in a dolomite reaction bed, so that acidic substances in the wastewater can be consumed, the pH value of the wastewater is increased, hydroxide ions are increased, and iron ions and the hydroxide ions are combined to generate precipitates, thereby achieving the purpose of consuming the iron ions.
According to the invention, the reaction mechanism of dolomite with wastewater is as follows:
CaMg(CO3)2+2H2SO4→CaSO4↓+MgSO4+H2O+2CO2↑
Fe3++3OH-→Fe(OH)3↓。
according to the invention, the chemical component of the dolomite trigonal carbonate mineral is CaMg (CO)3)2If the number of atoms of iron or manganese exceeds that of magnesium, it is called iron dolomite or manganese dolomite. The aggregate is usually granular, white in pure form, and gray in the presence of ironIt is brown and lustrous after weathering, and is the main mineral composing dolomites.
According to the invention, the pH value of the wastewater is monitored on line by using a pH on-line monitor in the reaction process, and the wastewater is sent to a mud-water separation process after reaching the standard.
Preferably, step 4), the primary precipitated water is stirred by air blast in the reaction process. In the preferred technical scheme, more air can be contacted and reacted with the wastewater by the air-blast stirring, so that the reaction is more sufficient.
Preferably, step 5), adopting an inclined tube type sedimentation tank to carry out sludge-water separation. In the preferred technical scheme, the inclined tube is adopted for precipitation, the surface area of the precipitate at the bottom side of the inclined tube is accumulated into a thin mud layer, and the precipitate slides back to a mud residue suspension layer under the action of gravity, so that the precipitate is convenient to collect.
Preferably, the pH value of the effluent subjected to the sludge-water separation in the step 6) is adjusted to be more than 6 by dolomite, and is preferably adjusted to be 6-9. The mode that the pH value of the effluent subjected to mud-water separation is regulated by dolomite comprises the following steps: sending the effluent water subjected to sludge-water separation into a pH value regulating tank provided with (paved and/or filled with) dolomite, contacting the effluent water subjected to sludge-water separation with the dolomite, and controlling the setting amount of the dolomite and the flow rate of wastewater to ensure that the pH value of the effluent water subjected to sludge-water separation is preset to be more than 6, preferably 6-9. In the preferred technical scheme, the effluent meets the treatment requirement and can be directly discharged.
Preferably, step 6), the solid-liquid separation mode is precipitation, and the precipitation adopts a baffled precipitation tank. In the preferred technical scheme, the baffling type sedimentation tank is arranged along the length direction of the tank, so that the load of the unit weir length is obviously reduced, and the effluent can keep a more uniform and stable flow velocity, thereby preventing the overflow of sludge scum.
According to the invention, the acidic iron-containing wastewater can be various acidic iron-containing wastewater, such as acidic iron-containing wastewater generated from mine gushing water, the pH value of the acidic iron-containing wastewater is 2.3-2.9, and Fe2+The content is 200-220 mg/L.
According to the invention, the dolomite can be reused after being used for a period of time and regenerated by washing with water.
Through the technical scheme, the invention has the following beneficial effects:
1. the wastewater treated and clarified by the method has the pH value of 6-9 and the Fe (Fe)2+) The concentration is lower than 2mg/L, meets the treatment requirement and can be directly discharged;
2. compared with the prior art, the waste residue generated by the treatment method is reduced by more than half, and the subsequent treatment difficulty is reduced;
3. the dolomite system has long service time and stable treatment effect, and greatly reduces the maintenance difficulty and the maintenance cost.
Drawings
FIG. 1 is a process flow diagram of the method for treating acidic iron-containing wastewater according to the present invention;
FIG. 2 is an SEM image of dolomite packing in a dolomite reaction bed before untreated acidic wastewater containing iron;
FIG. 3 is an SEM image of dolomite packing in a dolomite reaction bed after treatment of acidic iron-containing wastewater;
FIG. 4 is an SEM image and an EDS energy spectrum of a dolomite packing point-taking area in a dolomite reaction bed before the untreated acidic wastewater containing iron;
FIG. 5 is an SEM image and an EDS energy spectrum of a dolomite filler dotting area in a dolomite reaction bed after the acidic iron-containing wastewater is treated;
FIG. 6 is a comparison graph of TFe removal effects of laid dolomite and unpaved dolomite in a drop aeration field in an embodiment of the present invention;
FIG. 7 is a comparison graph of the effluent pH values of laid dolomite and unpaved dolomite in a drop aeration field in an embodiment of the invention;
FIG. 8 is a graph showing the effect of removing TFe in example 1 of the present invention and a comparative example;
FIG. 9 is a graph comparing the effect of removing final TFe repeatedly used by the treatment systems of example 1 of the present invention and the comparative example;
FIG. 10 is a graph showing the comparison of the final pH of wastewater when the treatment systems of example 1 of the present invention and comparative example were reused.
Description of the reference numerals
1 acid iron-containing wastewater 2 gravel
3 clear wastewater of sludge 4
5 drop aeration field for filtrate A
B adjusting desilting basin C dolomite reaction bed
D inclined tube type sedimentation tank E constructed wetland
F baffling type G sludge drying bed of sedimentation tank
Detailed Description
The method for treating the acidic iron-containing wastewater provided by the invention is described in detail below according to the attached drawing 1, and the treatment steps are as follows:
1) sending the acidic iron-containing wastewater 1 into a pH value pre-adjusting tank through dolomite to pre-adjust the pH value to be more than 3, preferably to 3-3.5;
2) aerating the wastewater with the pre-adjusted pH value by a drop aeration field A; the drop aeration field A can be built on a hillside, and the energy is saved by utilizing natural conditions compared with other aeration modes; in order to facilitate the smooth flowing of wastewater, only a shallow concave pool with the same gradient as a hillside is arranged in the water-drop aeration field A, one or more layers (normally one layer) of dolomite with the grain diameter of 4-6cm are laid in the concave pool, and the volume of the dolomite accounts for 95-100% of the volume of the aeration field;
3) the aerated wastewater enters a regulating primary sedimentation tank B for primary sedimentation to finish the sedimentation of gravel 2 and initial ferric hydroxide, and the pH value of effluent of the primary sedimentation is controlled to be 3.8-4.3 by adding sodium hydroxide solution;
4) reacting the primary precipitation effluent through a dolomite reaction bed C, stirring by blowing air in the reaction process, monitoring the pH value of the wastewater on line by using an online pH monitor in the reaction process, and sending the wastewater to the next procedure when the pH value is about 4.5;
5) performing sludge-water separation on effluent after the dolomite reaction by adopting an inclined tube type sedimentation tank D; the pH value of the effluent of the inclined tube type sedimentation tank D is about 5, and 3 times of sludge discharge is carried out every 12 hours.
6) The pH value of the effluent water after mud-water separation is adjusted to be more than 6 by utilizing dolomite, then a baffling sedimentation tank F is adopted for sedimentation, and the effluent water (namely clear wastewater 4) after sedimentation is discharged.
Discharging gravel 2 and sludge 3 generated in the reaction process into a sludge drying bed G, cleaning the sludge drying bed G to a landfill or carrying out treatment after drying, collecting filtrate 5 of the sludge drying bed G, introducing the collected filtrate into an inclined tube type sedimentation tank D, and discharging clear water which reaches the standard.
In the above steps, the pH value can reach the numerical range required by each step under normal conditions, and when the pH value cannot reach the numerical range required by each step, the pH value can be adjusted by adding a sodium hydroxide solution.
The following examples are provided to explain the present invention in detail. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Example 1
This example illustrates a preferred method for treating acidic iron-containing wastewater.
1) Acidic iron-containing wastewater (pH value of 2.3-2.9, Fe) generated from mine ore gushing water2+The content is 200-;
2) aerating the regulated wastewater in a drop aeration mode; the water-drop aeration field A is built on a hillside, dolomite with the grain diameter of 4-6cm is paved in the field, and the volume of the dolomite accounts for 95% of the volume of the aeration field;
3) the aerated wastewater enters a regulating primary sedimentation tank B for primary sedimentation to finish the sedimentation of gravel and initial ferric hydroxide, and the pH value of effluent of the primary sedimentation is controlled to be 3.8-4.3 by adding sodium hydroxide solution;
4) the primary precipitation effluent is reacted by a dolomite reaction bed C, blast stirring is adopted in the reaction process, the length of the dolomite reaction bed C is 8-10m, the width is 4-6m, the depth is 4-5m, the grain size of a dolomite filler is 4-6cm, the volume of the dolomite filler accounts for 80% of the volume of the reaction bed, and the pH value after the reaction is about 4.5. The SEM image of the dolomite filler in the dolomite reaction bed C before the acid-containing wastewater is treated is shown in FIG. 2, and the SEM image of the dolomite filler in the dolomite reaction bed C after the acid-containing wastewater is treated is shown in FIG. 3; the SEM picture and the EDS energy spectrum of the dolomite filler point-taking area before the treatment of the acidic iron-containing wastewater are shown in figure 4, and the SEM picture and the EDS energy spectrum of the dolomite filler point-taking area after the treatment of the acidic iron-containing wastewater are shown in figure 5. The characterization of the dolomite filler before and after the reaction is carried out by EDS + SEM, the ferric hydroxide precipitate can be seen to be deposited on the surface of the dolomite, the existence of the iron element can be detected, and the effective treatment of the acidic iron-containing wastewater by using the dolomite process is proved. Furthermore, we can see from the figure that the surface of the filler is covered with looser deposits, and the dolomite can continuously exert the maximum efficacy by cleaning the surface deposits regularly.
5) After the reaction, water is discharged, and then sludge-water separation is completed by adopting an inclined tube type sedimentation tank D; the pH value of the effluent of the inclined tube type sedimentation tank D is about 5, and sludge is discharged once every 12 hours.
6) The pH value of the effluent water of the mud-water separation is adjusted to be more than 6 by utilizing dolomite (the artificial wetland E with dolomite filler can be used here, the bottom of the artificial wetland E is paved with the dolomite with the grain diameter of 20-50cm, the soil is paved on the dolomite, trees such as tea trees and the like can be planted on the soil, so that the whole project is more beautiful), then the baffling sedimentation tank F is adopted for sedimentation, and the effluent water (namely clear wastewater) after the sedimentation is discharged.
Discharging gravel and sludge generated in the reaction process into a sludge drying bed G, cleaning the sludge drying bed G to a landfill or carrying out treatment after drying, collecting filtrate of the sludge drying bed G, introducing the collected filtrate into an inclined tube type sedimentation tank D, and discharging clear water which reaches the standard. The TFe (total iron) removal rate is shown in FIGS. 6 and 8, and the final effluent pH is shown in FIG. 7.
The final TFe removal rate of the dolomite system (comprising a dolomite preconditioning tank, a dolomite drop aeration field, a dolomite reaction bed and a dolomite constructed wetland) after repeated use for many times is shown in figure 9, the final pH value is shown in figure 10, and the dry slag amount of 5L waste water is shown in table 1.
Example 2
This example is intended to illustrate the treatment of an acidic iron-containing wastewater.
1) Acidic iron-containing wastewater (pH value of 2.3-2.9, Fe) generated from mine ore gushing water2+The content is 200-;
2) aerating the regulated wastewater in a drop aeration mode; the water drop aeration field A is built on a hillside;
3) the aerated wastewater enters a regulating primary sedimentation tank B for primary sedimentation to finish the sedimentation of gravel and initial ferric hydroxide, and the pH value of effluent of the primary sedimentation is controlled to be 3.8-4.3 by adding sodium hydroxide solution;
4) the primary precipitation effluent is reacted by a dolomite reaction bed C, blast stirring is adopted in the reaction process, the length of the dolomite reaction bed C is 8-10m, the width is 4-6m, the depth is 4-5m, the grain size of a dolomite filler is 4-6cm, the volume of the dolomite filler accounts for 80% of the volume of the reaction bed, and the pH value after the reaction is about 4.5.
5) After the reaction, water is discharged, and then sludge-water separation is completed by adopting an inclined tube type sedimentation tank D; the pH value of the effluent of the inclined tube type sedimentation tank D is about 5, and sludge is discharged once every 12 hours.
6) The pH value of the effluent water of the mud-water separation is adjusted to be more than 6 by utilizing dolomite (the artificial wetland E with dolomite filler can be used here, the bottom of the artificial wetland E is paved with the dolomite with the grain diameter of 20-50cm, the soil is paved on the dolomite, trees such as tea trees and the like can be planted on the soil, so that the whole project is more beautiful), then the baffling sedimentation tank F is adopted for sedimentation, and the effluent water (namely clear wastewater) after the sedimentation is discharged.
Discharging gravel and sludge generated in the reaction process into a sludge drying bed G, cleaning the sludge drying bed G to a landfill or carrying out treatment after drying, collecting filtrate of the sludge drying bed G, introducing the collected filtrate into an inclined tube type sedimentation tank D, and discharging clear water which reaches the standard. The TFe removal rate is shown in FIG. 6, and the final effluent pH is shown in FIG. 7.
As can be seen from FIGS. 6 and 7, the final treatment effect of laying dolomite in the aeration field is significantly better than that of the case of not laying dolomite.
Comparative example
This comparative example is used to illustrate a reference treatment method for acidic iron-containing wastewater.
1) Acidic iron-containing wastewater (pH value of 2.3-2.9, Fe) generated from mine ore gushing water2+The content is 200-;
2) aerating the regulated wastewater in a drop aeration mode; the water drop aeration field is built on a hillside, limestone with the grain diameter of 4-6cm is paved in the field, and the volume of the limestone accounts for 95% of the volume of the aeration field;
3) the wastewater after aeration enters a regulating primary sedimentation tank for primary sedimentation to finish the sedimentation of gravel and initial ferric hydroxide, and the pH value of effluent of the primary sedimentation is controlled to be 3.8-4.3 by adding sodium hydroxide solution;
4) reacting the primary precipitation effluent through a limestone reaction bed, and stirring by blast air in the reaction process;
5) after the reaction, water is discharged, and then sludge-water separation is completed by adopting an inclined tube type sedimentation tank; the pH value of the effluent of the inclined tube type sedimentation tank is about 5 (controlled by adding sodium hydroxide solution), and sludge is discharged once every 12 hours;
6) and (3) adjusting the pH value of the effluent water after the mud-water separation to be more than 6 by using limestone, then precipitating by using a baffled sedimentation tank, and discharging the effluent water after precipitation.
Discharging gravel and sludge generated in the reaction process into a sludge drying bed, cleaning the sludge drying bed to a landfill or carrying out treatment after drying, collecting filtrate of the sludge drying bed, introducing the collected filtrate into an inclined tube type sedimentation tank, and discharging clear water which meets the standard. The TFe removal rate is shown in FIG. 8.
The final TFe removal rate after repeated for many times by adopting the method is shown in figure 9, the final pH value is shown in figure 10, and the dry residue amount of 5L wastewater is shown in table 1.
TABLE 1 comparison of the amount of dry slag in the different treatment processes
As can be seen from fig. 8 and table 1, the removal rate of TFe when dolomite is used is almost the same as that when limestone is used, but the sludge production is reduced by more than half, and the secondary pollution is less; from figures 9 to 10 and table 1, it can be seen that the dolomite system of the present invention maintains a high process efficiency after 5 passes of treatment, whereas the limestone system has become poor after 4 passes of treatment and requires cleaning before it can be used again, thus the maintenance cost of the present invention is lower.
The preferred embodiments of the present invention have been described in detail with reference to the above and examples, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. The method for treating the acidic iron-containing wastewater is characterized by comprising the following steps of:
1) carrying out pH value pre-adjustment on the acidic iron-containing wastewater by dolomite;
2) aerating the wastewater with the preset pH value;
3) carrying out primary precipitation on the aerated wastewater;
4) reacting the primary precipitate effluent through a dolomite reaction bed;
5) carrying out mud-water separation on effluent after the dolomite reaction;
6) adjusting the pH value of the effluent after mud-water separation by using dolomite, then carrying out solid-liquid separation, and discharging the effluent.
2. The method for treating acidic iron-containing wastewater according to claim 1, wherein the pH of the acidic iron-containing wastewater is pre-adjusted to 3 or more, preferably to 3 to 3.5 in step 1).
3. The method for treating the acidic iron-containing wastewater according to claim 1, wherein in the step 2), the aeration is performed by adopting a drop aeration mode.
4. The method for treating the acidic wastewater containing iron according to claim 3, wherein dolomite with a grain size of 4-6cm is paved in the aeration field used in the drop aeration mode, and the volume of the dolomite accounts for 95-100% of the volume of the aeration field.
5. The method for treating acidic iron-containing wastewater according to claim 1, wherein the pH value of the effluent after the primary precipitation in step 3) is controlled to be 3.8-4.3.
6. The method for treating acidic wastewater containing iron according to claim 1, wherein in step 4), the dolomite reaction bed is filled with dolomite packing, the particle size of the dolomite packing is 4-6cm, and the volume of the dolomite packing accounts for 80-90% of the volume of the dolomite reaction bed.
7. The method for treating the acidic iron-containing wastewater according to claim 1 or 6, wherein in the step 4), the primary precipitated effluent is stirred by air blast in the reaction process.
8. The method for treating the acidic iron-containing wastewater according to claim 1, wherein in the step 5), sludge-water separation is performed by using an inclined tube type sedimentation tank.
9. The method for treating acidic iron-containing wastewater according to claim 1, wherein the pH value of the effluent from the sludge-water separation in step 6) is adjusted to 6 or more, preferably 6 to 9, by dolomite.
10. The method for treating the acidic iron-containing wastewater according to claim 1 or 6, wherein in the step 6), the solid-liquid separation mode is precipitation, and the precipitation adopts a baffled precipitation tank.
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| CN114653333A (en) * | 2022-04-18 | 2022-06-24 | 上海交通大学 | Application of titanium modified dolomite in adjusting muddy water interface |
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