CN115888249A - Filter bed filler for treating acid mine drainage and preparation method and application thereof - Google Patents
Filter bed filler for treating acid mine drainage and preparation method and application thereof Download PDFInfo
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- CN115888249A CN115888249A CN202211523893.9A CN202211523893A CN115888249A CN 115888249 A CN115888249 A CN 115888249A CN 202211523893 A CN202211523893 A CN 202211523893A CN 115888249 A CN115888249 A CN 115888249A
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention provides a filter bed filler for treating acid mine drainage and a preparation method and application thereof, wherein the preparation method comprises the following steps: adding the slow-release alkaline substance into pure water and uniformly stirring; adding ferrous salt and fully stirring; dropwise adding a hydrogen peroxide solution until no obvious bubbles escape from the mixed solution; adding phosphate and stirring uniformly to adjust the pH value of the mixed solution to be alkaline, and generating a precipitate; and filtering, drying and grinding the generated precipitate to prepare powder with a predetermined granularity, thereby obtaining the filter bed filler for treating the acid mine drainage. The invention provides a filter bed filler for treating acid mine drainage and a preparation method thereof, and the filter bed filler and the filter bed technology are used for treating the acid mine drainage, so that long-acting solidification of heavy metals in the acid mine drainage can be realized, and the problems of soil hardening, salinization, secondary pollution and the like can not be caused.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a filter bed filler for treating acid mine drainage and a preparation method and application thereof.
Background
The nonferrous metal resources of China are rich and the categories are complete. With the rapid development of national industry and science and technology, the demand of nonferrous metals is gradually increased, and the discharge of beneficiation wastewater and the stockpiling of tailings are also continuously increased. When sulfur-containing ores are exposed to air and undergo biochemical and biological oxidation triggered by water, oxygen and microorganism, surface water or underground water contacting the ores forms acidic ore drainage containing a large amount of sulfate and heavy metal ions.
After the untreated acid mine drainage is discharged into nearby rivers and lakes, the physical and chemical properties of the water body can be changed, so that the ecological cycle of the water body is damaged, and serious water body pollution is caused. Wastewater can acidify the water body, the deterioration of the water body affects the health and survival of animals, plants and microorganisms in the water, and finally the structure and function of an ecological system are seriously damaged. The waste water can also acidify the soil, so that the farmland is polluted, and the normal growth and even death of crops are influenced. The influence caused by heavy metal ions contained in the acid mine drainage is particularly serious, because the heavy metals are gradually accumulated in the water body and the soil and finally harm the human health along with the propagation. Therefore, the improvement of the treatment method for acid mine drainage is not slow.
At present, the treatment of acid mine drainage is generally carried out in the following modes:
1) Alkaline agents such as lime, sodium carbonate and the like are used for neutralization, but heavy metal precipitation in the method is unstable, the long-acting solidification of the heavy metal is difficult, and excessive addition is easy to cause soil hardening or salinization;
2) Sulfide precipitation, i.e. adding vulcanizing agents such as sodium sulfide and ferrous sulfide into ore drainage to generate heavy metal sulfide precipitate, but adding a vulcanizing agent can generate pollutants such as hydrogen sulfide and the like to cause secondary pollution.
Disclosure of Invention
Based on this, the invention aims to provide a filter bed filler for treating acid mine drainage and a preparation method and application thereof, so as to solve at least one technical problem in the background art.
According to the embodiment of the invention, the preparation method of the filter bed filler for treating the acid mine drainage water comprises the following steps:
adding the slow-release alkaline substance into pure water according to a predetermined solid-liquid adding ratio and uniformly stirring to obtain a primary mixed solution;
adding ferrous salt into the primary mixed solution according to the first addition concentration, and fully stirring to obtain a secondary mixed solution;
dropwise adding a hydrogen peroxide solution into the secondary mixed solution until no obvious bubbles escape from the mixed solution to obtain a tertiary mixed solution;
adding phosphate into the third mixed solution according to the second addition concentration, and uniformly stirring to adjust the pH value of the mixed solution to be alkaline, so as to generate a precipitate;
and filtering, drying and grinding the generated precipitate to prepare powder with a preset granularity, thus obtaining the filter bed filler for treating the acid mine drainage.
Preferably, the slow-release alkaline substance is one or a mixture of dolomite, black talc, apatite, chlorite and feldspar.
Preferably, the predetermined solid-to-liquid ratio is 20-70%.
Preferably, the first addition concentration is 0.05mol/L to 0.5mol/L.
Preferably, the second addition concentration is 0.05mol/L to 0.2mol/L.
Preferably, the molar ratio of the dropwise added hydrogen peroxide solution to the added ferrous iron is 0.5 to 1.5.
Preferably, the predetermined particle size is 20 to 80 mesh.
The invention also provides a filter bed filler for treating the acid mine drainage, which is prepared by the preparation method of the filter bed filler for treating the acid mine drainage.
The invention also provides the application of the filter bed filler for treating the acid mine drainage in treating the acid mine drainage, wherein the filter bed filler is filled in the filter bed for treating the acid mine drainage.
Compared with the prior art: according to the invention, the product generated by oxidizing the ferrous salt is coated on the surface of the slow-release alkaline substance to partially passivate the surface of the alkaline substance, so that the filter bed filler with large specific surface area, large interparticle gaps and strong adsorption capacity can be prepared through the mechanical activation of drying and grinding, the acidic ore drainage is treated through the filter bed filler and the filter bed, the filter bed filler can passivate various heavy metals such as Ni, mn, cu, pb, zn and the like in sewage, the purpose of long-acting solidification and stabilization of the heavy metals is achieved, and meanwhile, the filter bed filler can slowly release OH through partial passivation of the surface of the alkaline substance - The pH value of the sewage is adjusted to be kept between 6 and 9 for a long time, so that the adverse effects of medicament waste, excessive water body alkalinity, soil hardening or salinization and the like caused by adding excessive alkaline medicament are avoided; meanwhile, the preparation process of the filler is simple, sintering is not needed, and secondary pollution generated in the traditional filler preparation process is avoided.
Drawings
FIG. 1 is a pH value detection chart of inlet and outlet water according to comparative example 1 of the present invention;
FIG. 2 is a pH value detection chart of inlet and outlet water in example 1 of the present invention;
FIG. 3 is a graph showing the Zn, ni and Mn contents in inlet and outlet water of comparative example 1;
FIG. 4 is a diagram showing the Zn, ni and Mn content detection of inlet and outlet water in example 1 of the present invention;
FIG. 5 is a Cu and Pb content detection chart of inlet and outlet water in comparative example 1 of the present invention;
FIG. 6 is a Cu and Pb content detection chart of inlet and outlet water in example 1 of the present invention;
FIG. 7 is a pH value detection chart of inlet/outlet water in comparative example 2 of the present invention;
FIG. 8 is a pH value detection chart of inlet and outlet water in example 2 of the present invention;
FIG. 9 is a graph showing the Zn, ni and Mn contents in inlet and outlet water of comparative example 2;
FIG. 10 is a diagram showing the Zn, ni and Mn content detection of inlet and outlet water in example 2 of the present invention;
FIG. 11 is a Cu and Pb content detection chart of inlet and outlet water of comparative example 2 of the present invention;
FIG. 12 is a Cu and Pb content detection chart of inlet and outlet water in example 2 of the present invention;
FIG. 13 is a pH detection chart of inlet and outlet water in comparative example 3 of the present invention;
FIG. 14 is a pH value detection chart for inlet and outlet water in example 3 of the present invention;
FIG. 15 is a graph showing the Zn, ni and Mn contents in inlet and outlet water of comparative example 3 of the present invention;
FIG. 16 is a graph showing the Zn, ni, mn content in inlet and outlet water in example 3 of the present invention;
FIG. 17 is a Cu and Pb content detection chart of inlet and outlet water in comparative example 3 of the present invention;
FIG. 18 is a Cu and Pb content detection chart of inlet and outlet water in example 3 of the present invention;
FIG. 19 is a pH value detection chart of inlet and outlet water in comparative example 4 of the present invention;
FIG. 20 is a pH value detection chart of inlet and outlet water in example 4 of the present invention;
FIG. 21 is a graph showing the Zn, ni, mn contents in the inlet and outlet water of comparative example 4 of the present invention;
FIG. 22 is a diagram showing the Zn, ni and Mn content detection of inlet and outlet water in example 4 of the present invention;
FIG. 23 is a Cu and Pb content detection chart of inlet and outlet water in comparative example 4 of the present invention;
FIG. 24 is a Cu and Pb content detection chart of inlet and outlet water in example 4 of the present invention;
FIG. 25 is a pH detection chart of inlet and outlet water in comparative example 5 of the present invention;
FIG. 26 is a pH value detection chart for inlet/outlet water in embodiment 5 of the present invention;
FIG. 27 is a graph showing the Zn, ni and Mn contents in inlet and outlet water in comparative example 5 of the present invention;
FIG. 28 is a graph showing the Zn, ni, mn content in inlet and outlet water in example 5 of the present invention;
FIG. 29 is a Cu and Pb content detection chart for inlet and outlet water of comparative example 5 of the present invention;
FIG. 30 is a Cu and Pb content detection chart of inlet and outlet water in example 5 of the present invention;
in fig. 1 to 30, black marks are water inlet detection data, and white marks are water outlet detection data.
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Further, as used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. In the detailed description and claims, a list of items connected by the term "one of" may mean any of the listed items. For example, if items a and B are listed, the phrase "one of a and B" means a alone or B alone. In another example, if items a, B, and C are listed, the phrase "one of a, B, and C" means a only; only B; or only C. Item a may comprise a single element or multiple elements. Item B may comprise a single element or multiple elements. Item C may comprise a single element or multiple elements. In the detailed description and claims, a list of items linked by the term "at least one of," "at least one of," or other similar terms may mean any combination of the listed items. For example, if items a and B are listed, the phrase "at least one of a and B" or "at least one of a or B" means a only; only B; or A and B. In another example, if items a, B, and C are listed, the phrase "at least one of a, B, and C" or "at least one of a, B, or C" means a only; or only B; only C; a and B (excluding C); a and C (excluding B); b and C (excluding A); or all of A, B and C. Item a may comprise a single element or multiple elements. Item B may comprise a single element or multiple elements. Item C may comprise a single element or multiple elements.
At present, the alkaline agent neutralization or sulfide precipitation method is usually adopted to treat the acid mine drainage, but the problems of difficult long-acting heavy metal solidification, easy excessive addition, soil hardening or salinization, secondary pollution and the like exist. The invention aims to provide a filter bed filler for treating acidic mine drainage and a preparation method thereof, so that the acidic mine drainage is treated by the filter bed filler and a filter bed technology, namely, the long-acting solidification of heavy metals in the acidic mine drainage can be realized, and the problems of soil hardening, salinization, secondary pollution and the like can not be caused.
The embodiment of the invention provides a preparation method of a filter bed filler for treating acid mine drainage, which comprises the following steps:
1) Adding the slow-release alkaline substance into pure water according to a predetermined solid-liquid adding ratio and uniformly stirring to obtain a primary mixed solution;
2) Adding ferrous salt into the primary mixed solution according to the first addition concentration, and fully stirring to obtain a secondary mixed solution;
3) Dropwise adding a hydrogen peroxide solution into the secondary mixed solution until no obvious bubbles escape from the mixed solution to obtain a tertiary mixed solution;
4) Adding phosphate into the third mixed solution according to the second addition concentration, and uniformly stirring to adjust the pH value of the mixed solution to alkalinity so as to generate precipitate;
5) And filtering, drying and grinding the generated precipitate to prepare powder with a preset granularity, thereby obtaining the filter bed filler for treating the acid mine drainage.
The slow-release alkaline substance is formed by mixing one or more of dolomite, black talc, apatite, chlorite and feldspar, and the particle size of the slow-release alkaline substance is not larger than 20 meshes, so that the slow-release alkaline substance can be better and more uniformly dissolved in pure water to form ore pulp. The predetermined solid-to-liquid ratio is 20% to 70%, for example, 25%, 50%, 60%, or the like. The first addition concentration is 0.05 mol/L-0.5 mol/L, namely the concentration of the added ferrous salt is between 0.05 mol/L-0.5 mol/L, such as 0.15mol/L, 0.3mol/L and the like, the ferrous salt is preferably ferrous sulfate heptahydrate, the second addition concentration is 0.05 mol/L-0.2 mol/L, namely the concentration of the added phosphate is 0.05 mol/L-0.2 mol/L, such as 0.12mol/L, 0.15mol/L and the like, the phosphate is preferably dipotassium hydrogen phosphate, and the predetermined granularity is 20 meshes-80 meshes, namely the granularity of the filter bed filler for treating the acid mine drainage is 20 meshes-80 meshes, such as 30 meshes, 50 meshes and the like. The molar ratio of the dropwise added hydrogen peroxide solution to the added ferrous iron is 0.5-1.5, namely the added hydrogen peroxide solution (H) 2 O 2 ) Total amount of iron (Fe) added 2+ ) The molar ratio of the total amount is controlled to 0.5 to 1.5, for example, 1 or 1.2.
According to the embodiment of the invention, the product generated by oxidizing the ferrous salt is coated on the surface of the slow-release alkaline substance, so that the surface of the alkaline mine forms partial passivation, and the filter bed filler with large specific surface area, large interparticle gaps and strong adsorption capacity can be prepared through the mechanical activation of drying and grinding.
In some preferred embodiments, the hydrogen peroxide solution can be slowly added dropwise so that the filler can absorb OH more sufficiently - Combined with surface passivation of the filler, so that the filterThe bed packing material can slowly and persistently release OH through partial passivation of the surface of the alkaline ore - The pH value of the sewage is adjusted, so that the adjustment on the pH value of the sewage is more long-acting. During specific implementation, the dropping speed of the hydrogen peroxide solution can be controlled within a threshold value to control the slow dropping of the hydrogen peroxide solution, and the specific dropping speed can be adjusted according to actual needs.
The present invention will be described in detail below with reference to specific examples and comparative examples. In the following embodiments, the sewage is drained from an acid mine in a wide and rich mining area in Shanghai province in Jiangxi province, the used filter bed is an organic glass column, the diameter of the filter column is 35cm, the effective height of the filter column is 85cm, cobblestones are used as a water collecting layer, a rotary water distributor distributes water, the inflow rate of the water is 100ml/min, and the hydraulic retention time is 1.2h. The filler used in the examples is the filter bed filler prepared by the invention, the filler used in the comparative examples is the traditional filter bed filler such as limestone, dolomite, volcanic rock, pyrite, vermiculite and the like, and the examples and the comparative examples are compared by using different filter bed fillers of the same filter bed, and the specific details are as follows:
example 1
The preparation method of the filter bed filler for treating acid mine drainage in the embodiment 1 specifically comprises the following steps: adding feldspar into pure water according to a solid-liquid ratio of 30% to prepare ore pulp, adding 0.05mol/L ferrous sulfate heptahydrate, stirring, dropwise adding a hydrogen peroxide solution until bubbles do not escape obviously, wherein the molar ratio of the hydrogen peroxide solution to the ferrous sulfate is 0.5, then adding 0.05mol/L dipotassium hydrogen phosphate, stirring uniformly, and adjusting the pH value to be more than 8; filtering, drying and grinding the generated precipitate to prepare powder with the granularity of 40-80 meshes, thereby obtaining the filter bed filler for treating the acid mine drainage.
Comparative example 1 was set, and the filter bed packing used in comparative example 1 was untreated feldspar, with a particle size controlled to 40 to 80 mesh. The filter bed packing of example 1 and comparative example 1 were used in a filter bed, respectively, to treat the same acidic mine drainage water. Wherein the pH value of raw water of the acid mine drainage is 3.6-3.85, the raw water is introduced into a filter bed and runs for 6 periods every day, and water is distributed for 40min in each period. After 130 days of operation, the test indexes corresponding to comparative example 1 and example 1 are shown in fig. 1 to 6.
Example 2
The preparation method of the filter bed filler for treating acid mine drainage in the embodiment 2 specifically comprises the following steps: adding dolomite into pure water according to a solid-liquid ratio of 40% to prepare ore pulp, adding 0.1mol/L ferrous sulfate heptahydrate and stirring, dropwise adding a hydrogen peroxide solution until bubbles do not escape obviously, wherein the molar ratio of the hydrogen peroxide solution to the ferrous sulfate is 0.8, then adding 0.1mol/L dipotassium hydrogen phosphate and stirring uniformly, and adjusting the pH value to be more than 8; filtering, drying and grinding the generated precipitate to prepare powder with the granularity of 40-80 meshes, thereby obtaining the filter bed filler for treating the acid mine drainage.
Comparative example 2 was set, and the filter bed packing used in comparative example 2 was untreated dolomite with a particle size controlled to 40 to 80 mesh. The filter bed packing of example 2 and comparative example 2 were used in the filter bed, respectively, to treat the same acid mine drainage. Wherein the pH value of raw water of the acid mine drainage is 3.6-3.85, the raw water is introduced into a filter bed and runs for 6 periods every day, and water is distributed for 40min in each period. After 130 days of operation, the test indexes corresponding to comparative example 2 and example 2 are shown in fig. 7 to 12.
Example 3
The preparation method of the filter bed filler for treating acid mine drainage in the embodiment 3 specifically comprises the following steps: adding apatite into pure water according to a solid-liquid ratio of 60% to prepare ore pulp, adding 0.2mol/L ferrous sulfate heptahydrate, stirring, dropwise adding a hydrogen peroxide solution until bubbles do not escape obviously, wherein the molar ratio of the hydrogen peroxide solution to the ferrous sulfate is 1.2, then adding 0.15mol/L dipotassium hydrogen phosphate, stirring uniformly, and adjusting the pH value to be more than 8; filtering, drying and grinding the generated precipitate to prepare powder with the granularity of 40-80 meshes to obtain the filter bed filler for treating the acid mine drainage.
Comparative example 3 was set, and the filter bed packing used in comparative example 3 was untreated volcanic rock with a particle size controlled to 40-80 mesh. The filter bed packing of example 3 and comparative example 3 were used in the filter bed, respectively, to treat the same acid mine drainage. Wherein the pH value of raw water of the acid mine drainage is 3.6-3.85, the raw water is introduced into a filter bed and runs for 6 periods every day, and water is distributed for 40min in each period. After 130 days of operation, the test indexes corresponding to comparative example 3 and example 3 are shown in fig. 13 to fig. 18.
Example 4
The preparation method of the filter bed filler for treating the acid mine drainage in the embodiment 4 specifically comprises the following steps: adding chlorite into pure water according to a solid-to-liquid ratio of 50% to prepare ore pulp, adding 0.1mol/L ferrous sulfate heptahydrate and stirring, dropwise adding a hydrogen peroxide solution until bubbles do not escape obviously, wherein the molar ratio of the hydrogen peroxide solution to the ferrous sulfate is 1.5, then adding 0.2mol/L dipotassium hydrogen phosphate and stirring uniformly, and adjusting the pH value to be more than 8; filtering, drying and grinding the generated precipitate to prepare powder with the granularity of 40-80 meshes, thereby obtaining the filter bed filler for treating the acid mine drainage.
Comparative example 4 was set, and the filter bed filler used in comparative example 4 was untreated pyrite, with a particle size controlled between 40 and 80 mesh. The filter bed packing of example 4 and comparative example 4 were used in the filter bed, respectively, to treat the same acid mine drainage. Wherein the pH value of raw water of the acid mine drainage is 3.6-3.85, the raw water is introduced into a filter bed and runs for 6 periods every day, and water is distributed for 40min in each period. After 130 days of operation, the detection indexes corresponding to comparative example 4 and example 4 are shown in fig. 19 to 24.
Example 5
The preparation method of the filter bed filler for treating acid mine drainage in the embodiment 5 specifically comprises the following steps: adding dolomite into pure water according to a solid-liquid ratio of 70% to prepare ore pulp, adding 0.3mol/L ferrous sulfate heptahydrate and stirring, slowly dropwise adding a hydrogen peroxide solution until bubbles do not escape obviously, wherein the molar ratio of the hydrogen peroxide solution to the ferrous sulfate is 1.5, then adding 0.2mol/L dipotassium hydrogen phosphate and stirring uniformly, and adjusting the pH value to be more than 8; filtering, drying and grinding the generated precipitate to prepare powder with the granularity of 40-80 meshes to obtain the filter bed filler for treating the acid mine drainage.
Comparative example 5 was set, and the filter bed packing used in comparative example 5 was untreated vermiculite with a particle size controlled between 40 and 80 mesh. The filter bed packing of example 5 and comparative example 5 were used in filter beds, respectively, to remediate the same acidic mine drainage. Wherein the pH value of raw water of the acid mine drainage is 3.6-3.85, the raw water is introduced into a filter bed and runs for 6 periods every day, and water is distributed for 40min in each period. After 130 days of operation, the test indexes corresponding to comparative example 5 and example 5 are shown in fig. 25 to fig. 30.
In summary, as is apparent from fig. 1 to fig. 30, the filter bed filler with large specific surface area, large inter-particle gaps and strong adsorption capacity is prepared to treat the acidic mine drainage through the filter bed filler and the filter bed, the filter bed filler can passivate a plurality of heavy metals such as Ni, mn, cu, pb and Zn in the sewage, so as to achieve the purpose of long-acting solidification and stabilization of the heavy metals, and meanwhile, the filter bed filler can adjust the pH value of the sewage through slow and long-lasting release of OH ", so that the pH value of the sewage can be maintained at 6 to 9 for a long time, and adverse effects such as medicament waste, water over-alkali and the like caused by addition of excessive alkaline medicament are avoided; meanwhile, the filler is simple in preparation process, sintering is not needed, secondary pollution generated in the traditional filler preparation process is avoided, waste rocks and tailings generated in mining activities are effectively recycled, the land for stacking and the solid wastes are reduced, and the space pressure of a tailing pond is greatly relieved.
The embodiment of the invention also provides a filter bed filler for treating acid mine drainage, which is prepared by the preparation method of the filter bed filler for treating acid mine drainage in any embodiment.
The embodiment of the invention also provides the application of the filter bed filler for treating the acid mine drainage in treating the acid mine drainage, and the filter bed filler is filled in the filter bed for treating the acid mine drainage.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A preparation method of filter bed filler for treating acid mine drainage is characterized by comprising the following steps:
adding the slow-release alkaline substance into pure water according to a predetermined solid-liquid adding ratio and uniformly stirring to obtain a primary mixed solution;
adding ferrous salt into the primary mixed solution according to the first addition concentration, and fully stirring to obtain a secondary mixed solution;
dropwise adding a hydrogen peroxide solution into the secondary mixed solution until no obvious bubbles escape from the mixed solution to obtain a tertiary mixed solution;
adding phosphate into the third mixed solution according to the second addition concentration, and uniformly stirring to adjust the pH value of the mixed solution to alkalinity so as to generate precipitate;
and filtering, drying and grinding the generated precipitate to prepare powder with a preset granularity, thus obtaining the filter bed filler for treating the acid mine drainage.
2. The preparation method of the filter bed filler for treating acid mine drainage according to claim 1, wherein the slow-release alkaline substance is one or more of dolomite, black talc, apatite, chlorite and feldspar.
3. A method of preparing a filter bed packing for treatment of acid mine drainage water according to claim 1 or 2 wherein the predetermined add-on solid to liquid ratio is 20% to 70%.
4. The method of claim 1, wherein the first additive concentration is 0.05mol/L to 0.5mol/L.
5. The method of claim 1, wherein the second additive concentration is 0.05mol/L to 0.2mol/L.
6. The method of preparing a filter bed packing material for use in the remediation of acid mine drainage of claim 1, wherein the molar ratio of the dropwise added hydrogen peroxide solution to the added ferrous iron is 0.5 to 1.5.
7. The method of making a filter bed packing material for use in the remediation of acid mine drainage of claim 1, wherein the predetermined particle size is between 20 mesh and 80 mesh.
8. A filter bed packing for treating acidic mine drainage water, which is prepared by the method for preparing the filter bed packing for treating acidic mine drainage water according to any one of claims 1 to 7.
9. Use of the filter bed packing according to claim 8 for treatment of acid mine drainage water in a filter bed for treatment of acid mine drainage water.
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