Method for purifying mine gushing water

Abstract

The invention relates to a method for purifying mine gushing water. The method comprises the following steps: mixing filamentous microalgae and to-be-treated mine gushing water for purification treatment. According to the method, filamentous microalgae are adopted to purify the to-be-treated mine gushing water, extracellular polysaccharide secreted by the filamentous microalgae growing in the mine gushing water can adsorb suspended solids in the mine gushing water, and meanwhile, the filamentous microalgae grow in the mine gushing water to be bent and wound algae filaments can also remove the suspended solids in the mine gushing water; therefore, the purification effect of the mine gushing water is effectively improved. Moreover, compared with traditional inorganic flocculants and organic polymer flocculants, the filamentous microalgae adopted in the invention have no chemical residues, and have less pollution to the environment and less toxicity to the ecological environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, in particular to a purification method of mine gushing water. BACKGROUND

[0002] A large amount of mine gushing water is generated in the process of coal production. On the one hand, the mine gushing water is discharged, causing waste of water resources. On the other hand, a large amount of water resources are needed in the process of coal production, and coal resources are mostly distributed in areas where water resources are scarce. If the mine gushing water can be used as a resource, the pollution of the environment and the waste of water resources caused by the direct discharge of the mine gushing water can be solved, and the sustainable development of the coal industry can be promoted.

[0003] The composition of the mine gushing water is relatively complex, and most of the mine gushing water contains a certain amount of suspended solids, which are mainly derived from coal dust, rock powder, clay and other particles in the process of coal roadway excavation and coal mining. The presence of small particles in the mine gushing water makes the sensory properties of the mine gushing water poor, has small particle size, small density and is difficult to settle. The untreated mine gushing water directly discharged will cause harm to the ecological environment and also cause waste of water resources. However, the untreated mine gushing water directly used for production will have an adverse effect on the production equipment. Therefore, the mine gushing water needs to be treated before being recycled.

[0004] The treatment method of the mine gushing water usually adopts coagulation sedimentation, including high-efficiency sedimentation tank, high-efficiency cyclone and magnetic coagulation sedimentation. The traditional coagulation sedimentation uses flocculants including inorganic flocculants and organic high molecular flocculants. The inorganic flocculants are mostly aluminum salts or iron salts. However, the aluminum salt is toxic, and long-term use will cause the accumulation of aluminum salt in the human body, causing the loss of nutrients and trace elements in the human body and the destruction of physiological functions. The iron salt, as the main substitute for aluminum salt, may react with organic matter in water after the flocculant enters the water, causing pollution to the water. The most commonly used organic high molecular flocculant is polyacrylamide (PAM) and its derivatives. However, a certain amount of PAM remains in the treatment process, which is not easy to be decomposed and is toxic.

[0005] Therefore, it is necessary to improve the traditional technology. SUMMARY

[0006] Based on this, the present application provides a purification method of mine gushing water, which has good treatment effect, causes less pollution to the environment and has less toxic effect on the ecological environment.

[0007] The technical solution of the present application to solve the above technical problems is as follows.

[0008] The first aspect of the present application provides a purification method of mine gushing water, comprising the following steps:

[0009] The filamentous microalgae and the mine water to be treated are mixed for purification treatment.

[0010] In some embodiments of the method for purifying mine water, the filamentous microalgae include at least one of Anabaena and Nostoc.

[0011] In some embodiments of the method for purifying mine water, the mass concentration of the filamentous microalgae in the mixed solution obtained by mixing the filamentous microalgae and the mine water to be treated is 0.1 g / L-0.5 g / L.

[0012] In some embodiments of the method for purifying mine water, the mixing solution is stirred and / or aerated during the purification treatment.

[0013] In some embodiments of the method for purifying mine water, the purification treatment is performed at a temperature of 12℃-35℃.

[0014] In some embodiments of the method for purifying mine water, the purification treatment is performed under natural light.

[0015] In some embodiments of the method for purifying mine water, the mine water includes coal mine water.

[0016] In some embodiments of the method for purifying mine water, the method for obtaining the filamentous microalgae includes the following steps:

[0017] The filamentous microalgae strain is inoculated into a culture medium for culture.

[0018] In some embodiments of the method for purifying mine water, the culture medium includes the following components:

[0019] Dipotassium hydrogen phosphate 0.032 g / L-0.048 g / L, magnesium sulfate heptahydrate 0.06 g / L-0.09 g / L, calcium chloride 0.029 g / L-0.043 g / L, sodium carbonate 0.018 g / L-0.022 g / L, citric acid 0.005 g / L-0.007 g / L, ferric ammonium citrate 0.005 g / L-0.007 g / L, EDTA 0.0009 g / L-0.0011 g / L, trace element solution A5 1 mL / L; wherein the components in the trace element solution A5 are: boric acid 2.29 g / L-3.43 g / L, manganese chloride dihydrate 1.45 g / L-2.17 g / L, zinc sulfate heptahydrate 0.178 g / L-0.266 g / L, sodium molybdate 0.312 g / L-0.468 g / L, copper sulfate pentahydrate 0.063 g / L-0.095 g / L, and cobalt nitrate hexahydrate 0.039 g / L-0.059 g / L.

[0020] In some of the embodiments, the purification method of mine water inflow, the culture conditions include: temperature is 20-30℃, light intensity is 50 μmol / (m 2 ·s) 200 μmol / (m 2 ·s), light time is 8-16 h per day, and culture time is 2-10 days.

[0021] The purification method of mine water inflow provided in the application uses filamentous microalgae to purify the mine water inflow to be treated. The extracellular polysaccharide secreted by the filamentous microalgae growing in the mine water inflow can adsorb the suspended solids in the mine water inflow. At the same time, the curved and entangled algal filaments of the filamentous microalgae growing in the mine water inflow also have a removal effect on the suspended solids in the mine water inflow, thereby effectively improving the purification effect of the mine water inflow. Moreover, compared with the traditional inorganic flocculants and organic polymer flocculants, the filamentous microalgae used in the application will not have chemical residues, and will have less environmental pollution and less toxic harm to the ecological environment. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the application, more completely understand the application and its beneficial effects, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0023] Figure 1 The photomicrograph of the filamentous microalgae in the concentrated filamentous microalgae algal liquid prepared in step (2) of Example 1;

[0024] Figure 2 The photomicrograph of the filamentous microalgae when the filamentous microalgae is used to purify the mine water inflow;

[0025] Figure 3 The process flow diagram of the mine water inflow treatment process provided in Example 1;

[0026] Figure 4 The situation diagram of the mine water inflow purification treatment by using filamentous algae (Anabaena) in Example 1 and non-filamentous algae in Comparative Example 1. DETAILED DESCRIPTION

[0027] The application will be further described in detail below in combination with the embodiments and examples. It should be understood that these embodiments and examples are only used to illustrate the application and not to limit the scope of the application. The purpose of providing these embodiments and examples is to make the understanding of the disclosed content of the application more thorough and comprehensive.

[0028] It is also to be understood that the application can be carried out in various ways and that the application can be implemented in numerous forms, not all of which have been described herein; it should be understood that any subsequent changes and / or modifications in form or substance can be made by one skilled in the art without departing from the spirit of the present application and that the intended scope of the application is within the scope of the following claims.

[0029] Unless otherwise defined, 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 application belongs. The terminology used in the description herein is for describing the embodiments and examples only and is not intended to be limiting.

[0030] Unless otherwise defined, or if used in contradiction below, the terms or phrases used herein have the following meanings:

[0031] In the present application, "a plurality of", "a plurality of kinds", "a plurality of times" and the like, if not particularly limited, refer to more than two or equal to two in number. For example, "one or more" means one or more than two.

[0032] As used herein, "combinations thereof", "any combination thereof", "any combination manner thereof" and the like include all suitable combination manners of any two or more of the listed items.

[0033] As used herein, "suitable combination manner", "suitable manner", "any suitable manner" and the like, "suitable" means that the technical solutions of the present application can be implemented, the technical problems of the present application can be solved, and the intended technical effects of the present application can be achieved.

[0034] As used herein, "preferably", "better", "more preferably", "suitably" only describe the embodiments or examples with better effects, and it should be understood that it does not constitute a limitation on the protection scope of the present application. If there are multiple "preferably" in a technical solution, and there is no special description, and no contradictory or mutually restrictive relationship, each "preferably" is independent.

[0035] In the present application, "further", "more further", "particularly" and the like are used for description purposes, indicating differences in content, but should not be understood as a limitation on the protection scope of the present application.

[0036] In the present application, "optionally", "optional", "option" means optional, that is, selected from "yes" or "no" two parallel schemes. If there are multiple "options" in a technical solution, unless otherwise specified, and there is no contradiction or mutual restriction, each "option" is independent.

[0037] In the present application, the terms "first", "second", "third", "fourth" and the like in the "first aspect", "second aspect", "third aspect", "fourth aspect" and the like are only for description purposes, and cannot be understood as indicating or implying relative importance or quantity, nor can it be understood as implying the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", "fourth" and the like only serve the purpose of non-exhaustive enumeration description, and should be understood as not constituting a closed limitation on the quantity.

[0038] In the present application, the technical features described in an open manner include closed technical solutions consisting of the listed features, and also include open technical solutions containing the listed features.

[0039] In the present application, with respect to the numerical interval (i.e. numerical range), unless otherwise specified, the distribution of the optional values in the numerical interval is considered to be continuous, and includes the two numerical endpoints (i.e. the minimum value and the maximum value) of the numerical interval, as well as every value between the two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to the integers within the numerical interval, including the two endpoint integers of the numerical range and every integer between the two endpoints, it is equivalent to directly listing each integer. When multiple numerical ranges are provided to describe a feature or characteristic, these numerical ranges can be combined. In other words, unless otherwise specified, the numerical range disclosed herein should be understood to include any and all sub-ranges encompassed therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. The "numerical interval" is allowed to broadly include numerical interval types such as percentage interval, ratio interval, and value interval.

[0040] In the present application, unless otherwise specified, the temperature parameter allows for constant temperature treatment and allows for variation within a certain temperature interval. It should be understood that the constant temperature treatment allows the temperature to fluctuate within the accuracy range controlled by the instrument. It is allowed to fluctuate within the range of, for example, ±5°C, ±4°C, ±3°C, ±2°C, ±1°C.

[0041] In the present application, the term "room temperature" or "normal temperature" generally refers to 4°C to 35°C, for example 20°C ± 5°C. In some embodiments of the present application, "room temperature" or "normal temperature" refers to 10°C to 30°C. In some embodiments of the present application, "room temperature" or "normal temperature" refers to 20°C to 30°C.

[0042] In the present application, if the unit is only behind the right end point, it means that the units of the left end point and the right end point are the same. For example, 3~5 h means that the units of the left end point "3" and the right end point "5" are both h (hours).

[0043] All the documents mentioned in the present application are cited as references in the present application as if each document is cited as a reference individually. Unless and to the extent that the purpose and / or technical solution of the present application is in conflict with the cited documents, the cited documents are cited in the present application in their entirety, in their entirety. When the present application refers to the cited documents, the definitions of the relevant technical features, terms, nouns, phrases, etc. in the cited documents are also cited. When the present application refers to the cited documents, the examples and preferred modes of the cited relevant technical features can also be incorporated into the present application as references, but are limited to the implementation of the present application. It should be understood that when the cited content conflicts with the description in the present application, the present application is correct or is modified according to the description in the present application.

[0044] The mass or weight of the relevant components mentioned in the present application embodiment specification can not only refer to the specific content of each component, but also represent the mass or weight ratio relationship between each component. Therefore, as long as the content of the relevant components in the present application embodiment specification is enlarged or reduced in proportion, it is within the scope disclosed in the present application embodiment specification. Specifically, the mass or weight described in the present application embodiment specification can be μg, mg, g, kg and other units well known in the chemical field.

[0045] An embodiment of the present application provides a mine water inflow purification method, comprising the following steps:

[0046] Mixing the filamentous microalgae and the mine water inflow to be treated for purification treatment.

[0047] By using the filamentous microalgae to purify the mine water inflow to be treated, the extracellular polysaccharide secreted by the filamentous microalgae growing in the mine water inflow can adsorb the suspended matter in the mine water inflow, and the curved and entangled algal filaments of the filamentous microalgae growing in the mine water inflow can also remove the suspended matter in the mine water inflow, thereby effectively improving the purification effect of the mine water inflow. Moreover, compared with the traditional inorganic flocculants and organic polymer flocculants, the filamentous microalgae used in the present application will not have chemical residues, and will cause less environmental pollution and less harm to the ecological environment.

[0048] It can be understood that the suspended matter in the mine water inflow includes coal dust, rock powder, clay and other particles.

[0049] Using the filamentous microalgae to treat the mine water inflow can reduce the use of traditional inorganic flocculants and organic polymer flocculants in wastewater treatment and the harm of chemical residues to the environment.

[0050] After the purification treatment, the filamentous microalgae is separated, and the obtained water can be reused in the coal mining production process or used for surrounding landscape irrigation, thereby improving the water resource utilization efficiency.

[0051] In some embodiments of the method for purifying mine water, the filamentous microalgae comprises at least one of Anabaena and Nostoc.

[0052] In some embodiments of the method for purifying mine water, the mass concentration of the filamentous microalgae in the mixed solution obtained by mixing the filamentous microalgae and the mine water to be treated is 0.1 g / L-0.5 g / L.

[0053] It can be understood that the mass concentration of the filamentous microalgae includes but is not limited to 0.1 g / L, 0.2 g / L, 0.3 g / L, 0.4 g / L, 0.5 g / L; in some examples, it can be within the range formed by any two of these point values as end values, and the same applies below.

[0054] In some embodiments of the method for purifying mine water, the mixing solution is stirred and / or aerated during the purification treatment step.

[0055] Optionally, the stirring is mechanical stirring.

[0056] "Aeration" refers to the process of passing gas into a liquid. Optionally, the gas for aeration can be air or CO2 with a volume fraction of 0.1%-5%.

[0057] In some embodiments of the method for purifying mine water, the temperature of the purification treatment is 12℃-35℃.

[0058] It can be understood that the temperature of the purification treatment includes but is not limited to 12℃, 15℃, 18℃, 20℃, 22℃, 25℃, 28℃, 30℃, and 35℃.

[0059] In some embodiments of the method for purifying mine water, the purification treatment is performed under natural light.

[0060] In some embodiments of the method for purifying mine water, the mine water comprises coal mine water.

[0061] It can be understood that the filamentous microalgae can be obtained by culturing filamentous microalgae strains, for example, large-scale culturing of filamentous microalgae using mine water.

[0062] In some embodiments of the method for purifying mine water, the method for obtaining the filamentous microalgae comprises the following steps:

[0063] The filamentous microalgae strain is inoculated into a culture medium for culture.

[0064] In some embodiments, the method for purifying mine water, the culture medium comprises BG110 medium.

[0065] In some embodiments, the method for purifying mine water, the culture medium comprises the following components:

[0066] Dipotassium hydrogen phosphate 0.032 g / L-0.048 g / L, magnesium sulfate heptahydrate 0.06 g / L-0.09 g / L, calcium chloride 0.029 g / L-0.043 g / L, sodium carbonate 0.018 g / L-0.022 g / L, citric acid 0.005 g / L-0.007 g / L, ferric ammonium citrate 0.005 g / L-0.007 g / L, EDTA 0.0009 g / L-0.0011 g / L, trace element solution A5 1 mL / L; wherein the components in trace element solution A5 are: boric acid 2.29 g / L-3.43 g / L, manganese chloride dihydrate 1.45 g / L-2.17 g / L, zinc sulfate heptahydrate 0.178 g / L-0.266 g / L, sodium molybdate 0.312 g / L-0.468 g / L, copper sulfate pentahydrate 0.063 g / L-0.095 g / L, cobalt nitrate hexahydrate 0.039 g / L-0.059 g / L.

[0067] It can be understood that the culture medium can be configured using mine water.

[0068] In some embodiments, the method for purifying mine water, the culture conditions comprise: temperature 20℃-30℃, light intensity 50 μmol / (m 2 ·s)-200 μmol / (m 2 ·s, light time 8 h-16 h per day, and culture time 2-10 days.

[0069] It can be understood that the culture can be carried out under natural light conditions; when the natural light is insufficient, an LED lamp is used as a supplementary light source.

[0070] In some embodiments, a raceway pond is used for culturing the filamentous microalgae.

[0071] In some embodiments, agitation and / or aeration are carried out during the culture process. Alternatively, the agitation is mechanical agitation.

[0072] It can be understood that in the culturing step of the filamentous microalgae, the degree of culture is to the logarithmic growth phase.

[0073] In some embodiments, after the culture to the logarithmic growth phase, the aeration and agitation are stopped, the filamentous microalgae are naturally settled at the bottom of the culture device after self-flocculation, and the filamentous microalgae are separated.

[0074] In some embodiments, in the step of separating the filamentous microalgae, the supernatant is separated to obtain the lower concentrated filamentous microalgae liquid, and the filamentous microalgae liquid is used to purify the mine gushing water.

[0075] By the entanglement and adsorption of the filamentous microalgae algal filaments to the suspended solids in the mine gushing water, the effect of removing the suspended solids in the mine gushing water is achieved after the harvesting and separation of the filamentous microalgae.

[0076] Hereinafter, the present application will be described in further detail with reference to specific embodiments, but the embodiments of the present application are not limited thereto.

[0077] Example 1

[0078] (1) An Anabaena flos-aquae strain is used for large-scale cultivation, and a BG110 culture medium is used, and the components of the culture medium include: dipotassium hydrogen phosphate 0.032 g / L-0.048 g / L, magnesium sulfate heptahydrate 0.06 g / L-0.09 g / L, calcium chloride dihydrate 0.029 g / L-0.043 g / L, sodium carbonate 0.018 g / L-0.022 g / L, citric acid 0.005 g / L-0.007 g / L, ferric ammonium citrate 0.005 g / L-0.007 g / L, EDTA 0.0009 g / L-0.0011 g / L, trace element solution A5 1 mL / L; wherein the components in the trace element solution A5 are: boric acid 2.29 g / L-3.43 g / L, manganese chloride dihydrate 1.45 g / L-2.17 g / L, zinc sulfate heptahydrate 0.178 g / L-0.266 g / L, sodium molybdate 0.312 g / L-0.468 g / L, copper sulfate pentahydrate 0.063 g / L-0.095 g / L, and cobalt nitrate hexahydrate 0.039 g / L-0.059 g / L; the culture conditions include: temperature 20°C-30°C, light intensity 50 μmol / (m 2 ·s)-200 μmol / (m 2 ·s), light time 8 h-16 h per day, culture time 2-10 days, aeration and mechanical agitation, and the degree of culture is to the logarithmic growth phase.

[0079] (2) After the filamentous microalgae grown to the logarithmic growth phase stops aeration and mechanical agitation, the filamentous algal filaments are naturally settled at the bottom of the culture device after self-flocculation, the supernatant is separated to obtain the lower concentrated filamentous microalgae liquid, and the microscopic examination of the filamentous microalgae is shown in Figure 1 .

[0080] (3) adding the concentrated filamentous microalgae liquid to the mine gushing water to obtain a mixed liquid, the mass concentration of the filamentous microalgae in the mixed liquid being 0.5 g / L; purifying treatment is performed under natural light and mechanical agitation, and the microscopic examination of the filamentous microalgae in the purifying treatment is shown in FIG. 2. Figure 2 It can be known that the filamentous algae filaments have the effect of adsorbing and winding the suspended solids in the mine gushing water. After the suspended solids and the algae filaments are naturally settled at the bottom of the reactor, the upper effluent is separated, and the effluent quality meets the needs of environmental discharge and industrial production. Figure 2

[0081] The process flow of steps (1)-(3) is shown in FIG. 1. Figure 3

[0082] Example 2

[0083] (1) The Nostoc sp. is used as the filamentous microalgae strain for large-scale cultivation, and the BG110 culture medium is used, the components of the culture medium including: dipotassium hydrogen phosphate 0.032 g / L-0.048 g / L, magnesium sulfate heptahydrate 0.06 g / L-0.09 g / L, calcium chloride dihydrate 0.029 g / L-0.043 g / L, sodium carbonate 0.018 g / L-0.022 g / L, citric acid 0.005 g / L-0.007 g / L, ferric ammonium citrate 0.005 g / L-0.007 g / L, EDTA 0.0009 g / L-0.0011 g / L, trace element solution A5 1 mL / L; wherein the components in the trace element solution A5 are: boric acid 2.29 g / L-3.43 g / L, manganese chloride dihydrate 1.45 g / L-2.17 g / L, zinc sulfate heptahydrate 0.178 g / L-0.266 g / L, sodium molybdate 0.312 g / L-0.468 g / L, copper sulfate pentahydrate 0.063 g / L-0.095 g / L, cobalt nitrate hexahydrate 0.039 g / L-0.059 g / L; the cultivation conditions include: temperature 20℃-30℃, light intensity 50 μmol / (m 2 ·s)-200 μmol / (m 2 ·s, light time 8 h-16 h per day, cultivation time 2-10 days, aeration and mechanical agitation, and the degree of cultivation is to the logarithmic growth phase.

[0084] (2) After the filamentous microalgae grown to the logarithmic growth phase stops aeration and mechanical agitation, the filamentous algae filaments are naturally settled at the bottom of the culture device after self-flocculation, and the upper supernatant is separated to obtain the lower concentrated filamentous microalgae liquid.

[0085] ​​(3) The concentrated filamentous microalgae solution was added to the mine inflow to obtain a mixed solution with a mass concentration of 0.1 g / L of filamentous microalgae. The solution was then purified by aeration and mechanical stirring under natural light. The filamentous algae adsorbed and entangled the suspended solids in the mine inflow. After the suspended solids and algae settled naturally to the bottom of the reactor, the upper effluent was separated. The effluent quality met the requirements for environmental discharge and industrial production.

[0086] Comparative Example 1

[0087] The treatment is basically the same as in Example 1, except that non-filamentous microalgae are used to treat the mine water in Jinhua, as detailed below:

[0088] (1) Large-scale cultivation was carried out using non-filamentous microalgae (Chlorella) on a BG110 medium. The medium consisted of: dipotassium hydrogen phosphate 0.032 g / L-0.048 g / L, magnesium sulfate heptahydrate 0.06 g / L-0.09 g / L, calcium chloride dichloride 0.029 g / L-0.043 g / L, sodium carbonate 0.018 g / L-0.022 g / L, citric acid 0.005 g / L-0.007 g / L, ferric ammonium citrate 0.005 g / L-0.007 g / L, EDTA 0.0009 g / L-0.0011 g / L, and trace element solution A5 1 mL / L. The trace element solution A5 consisted of: boric acid 2.29 g / L-3.43 g / L and manganese chloride dihydrate 1.45 g / L-2.17 g / L. The concentrations of the following substances were used: zinc sulfate heptahydrate 0.178 g / L-0.266 g / L, sodium molybdate 0.312 g / L-0.468 g / L, copper sulfate pentahydrate 0.063 g / L-0.095 g / L, and cobalt nitrate hexahydrate 0.039 g / L-0.059 g / L; the culture conditions included a temperature of 20℃-30℃ and a light intensity of 50 μmol / (m²). 2 ·s)-200 μmol / (m 2 •s), light duration is 8 h-16 h per day, culture time is 2-10 days, aeration and mechanical stirring are used, and the culture is carried out to the logarithmic growth phase.

[0089] (2) After stopping aeration and mechanical stirring, the microalgae that have grown to the logarithmic growth phase are centrifuged to separate the supernatant and obtain the lower concentrated microalgae liquid.

[0090] (3) Add concentrated microalgae solution to mine water to obtain a mixture with a microalgae concentration of 0.1 g / L; purify the mixture by aeration under natural light and mechanical stirring.

[0091] Figure 4Example 1 used filamentous algae (Anabaena) and Comparative Example 1 used non-filamentous algae to purify mine water for 1 day. Figure 4 (1 day) and 5 days ( Figure 4 The purification status is shown in Figure 5 (5 days). Compared to non-filamentous algae, filamentous algae are easier to harvest through self-precipitation, avoiding harvesting operations such as centrifugation, flocculants, and filtration, reducing reagent consumption, energy consumption, and harvesting time.

[0092] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The embodiments described above are merely illustrative of several implementation methods of this application, intended to facilitate a detailed understanding of the technical solutions of this application, but should not be construed as limiting the scope of protection of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. It should be understood that technical solutions obtained by those skilled in the art based on the technical solutions provided in this application through logical analysis, reasoning, or limited experimentation are all within the scope of protection of the appended claims. Therefore, the scope of protection of this patent application should be determined by the content of the appended claims, and the specification can be used to interpret the content of the claims.

Claims

1. A method for purifying mine water, characterized in that, Includes the following steps: The filamentous microalgae are mixed with the mine water to be treated for purification.

2. The method for purifying mine water as described in claim 1, characterized in that, The filamentous microalgae include at least one of Anabaena and Nostoc.

3. The method for purifying mine water as described in claim 1, characterized in that, The mass concentration of the filamentous microalgae in the mixture obtained by mixing the filamentous microalgae and the mine water to be treated is 0.1 g / L-0.5 g / L.

4. The method for purifying mine water as described in claim 3, characterized in that, In the purification process, the mixture is stirred and / or aerated.

5. The method for purifying mine water as described in any one of claims 1 to 4, characterized in that, The purification process is carried out at a temperature of 12℃-35℃.

6. The method for purifying mine water as described in any one of claims 1 to 4, characterized in that, The purification process is carried out under natural light.

7. The method for purifying mine water as described in any one of claims 1 to 4, characterized in that, The mine water inflow includes coal mine water inflow.

8. The method for purifying mine water as described in any one of claims 1 to 4, characterized in that, The method for obtaining the filamentous microalgae includes the following steps: Filamentous microalgae strains were inoculated into a culture medium for cultivation.

9. The method for purifying mine water as described in claim 8, characterized in that, The culture medium comprises the following components: The following are the components of the trace element solution A5: 0.032 g / L-0.048 g / L dipotassium hydrogen phosphate, 0.06 g / L-0.09 g / L magnesium sulfate heptahydrate, 0.029 g / L-0.043 g / L calcium chloride dihydrate, 0.018 g / L-0.022 g / L sodium carbonate, 0.005 g / L-0.007 g / L citric acid, 0.005 g / L-0.007 g / L ferric ammonium citrate, 0.0009 g / L-0.0011 g / L EDTA, and 1 mL / L trace element solution A5; wherein the components of trace element solution A5 are: 2.29 g / L-3.43 g / L boric acid, 1.45 g / L-2.17 g / L manganese chloride dihydrate, 0.178 g / L-0.266 g / L zinc sulfate heptahydrate, and 0.312 g / L sodium molybdate. Copper sulfate pentahydrate 0.063 g / L-0.095 g / L, cobalt nitrate hexahydrate 0.039 g / L-0.059 g / L.

10. The method for purifying mine water as described in claim 9, characterized in that, The cultivation conditions include: a temperature of 20℃-30℃ and a light intensity of 50 μmol / (m²). 2 ·s)-200 μmol / (m 2 •s), the light duration is 8 h-16 h per day, and the culture time is 2-10 days.

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