CN112919640A - Integrated photobioreactor for efficiently treating and quickly harvesting rare earth tail water by flocculating microalgae - Google Patents
Integrated photobioreactor for efficiently treating and quickly harvesting rare earth tail water by flocculating microalgae Download PDFInfo
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- CN112919640A CN112919640A CN202110167406.9A CN202110167406A CN112919640A CN 112919640 A CN112919640 A CN 112919640A CN 202110167406 A CN202110167406 A CN 202110167406A CN 112919640 A CN112919640 A CN 112919640A
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
- C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
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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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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Abstract
An integrated photobioreactor for efficiently treating and quickly harvesting rare earth tail water by flocculating microalgae relates to a photobioreactor for treating and harvesting rare earth tail water. The invention aims to solve the technical problems that the existing rare earth tailing wastewater treatment method is high in cost, relatively small in wastewater treatment volume and inconvenient in recovery of microalgae after the wastewater is treated by the microalgae. The invention adjusts the influence of external conditions on the growth of the flocculated microalgae through the constant-temperature water bath heating, the lighting equipment and the aeration device, solves the existing problems of separation and recovery of the flocculated microalgae and the wastewater, and realizes the separation of the microalgae and the treated wastewater by utilizing gravity flow through opening the knobs of the water outlets. The invention improves the efficiency of microalgae recovery by multi-stage water outlet liquid drainage. The device of the invention integrates the high-efficiency treatment of the rare earth tail water and the quick harvest of the flocculent microalgae.
Description
Technical Field
The invention relates to a photobioreactor for treating and harvesting rare earth tail water.
Background
China is a world with large reserves of rare earth resources, and not only is the reserve abundant, but also the species of ores and rare earth elements are complete, and the rare earth grade is high. The rare earth processing industry has formed an industrial chain including mining, mineral separation, smelting and processing as a whole. The rare earth industry is an important support industry in the Ganzhou city and plays a significant role in promoting the economic development in the Gannan region. In recent years, the Ganzhou has been constructed in full force, namely the China Dingjin valley, and the new materials and the application industries of nonferrous metals such as rare earth, tungsten and the like are promoted to advance to high-end. The rare earth tailing wastewater generated in the rare earth industry as a large amount of pollutants affects the local environment, and the water is characterized in that: high ammonia nitrogen and nitrate nitrogen, low organic matter, low pH, high sulfate, low concentration of heavy metal and residual rare earth elements. At present, a treatment method which is low in cost and can effectively treat ammonia nitrogen in rare earth tail water is urgently needed.
The traditional microalgae wastewater treatment related experiments are measured in utensils such as beakers and conical flasks, related conditions need to be cultured in a greenhouse, related factors are difficult to control, the wastewater treatment volume is relatively small, reasonable recovery of microalgae cannot be realized, and the factors limit the practical significance of microalgae in wastewater treatment.
Disclosure of Invention
The invention provides an integrated photobioreactor for efficiently treating and quickly harvesting rare earth tailings by flocculating microalgae, aiming at solving the technical problems that the existing rare earth tailings wastewater treatment method is high in cost, relatively small in wastewater treatment volume and inconvenient for recovering microalgae after the microalgae treat wastewater.
The invention relates to an integrated photobioreactor for efficiently treating and quickly harvesting rare earth tail water by flocculating microalgae, which consists of a reactor main body 1, a reaction chamber 2, a cover body 4, lighting equipment 5, a heating device 6, a support 7, a water outlet 8, a water outlet 9, an aeration ring 10, a separation device 11, an algae liquid discharge pipe 12, an air inlet pipe 13, a first valve 14, a second valve 15 and a third valve;
a plurality of reaction chambers 2 are uniformly fixed on the bottom surface of the inner cavity of the reactor main body 1, a separation device 11 is arranged at the bottom of each reaction chamber 2, the separation device 11 is arranged below the bottom surface of the reactor main body 1, the separation device 11 is of a hollow conical structure, the end with a larger opening is arranged above, and the inner cavity of the separation device 11 is communicated with the inner cavity of each reaction chamber 2; the bottom of the separation device 11 is communicated with an algae liquid discharge pipe 12, a water outlet 9 is arranged at the center of the algae liquid discharge pipe 12 in the height direction, and a third valve is arranged on the water outlet 9; a first valve 14 is arranged at the bottom of the algae liquid discharge pipe 12; two water outlets 8 are formed in the outer wall of each reaction chamber 2, the two water outlets 8 are arranged up and down, the water outlets 8 penetrate through the side wall of the reactor main body 1, a second valve 15 is arranged on each water outlet 8, and the second valve 15 is arranged outside the reactor main body 1;
an aeration ring 10 is arranged on the inner side wall of the separation device 11, an aeration opening of the aeration ring 10 faces upwards, an air inlet of the aeration ring 10 is communicated with an air outlet of an air inlet pipe 13, the air inlet pipe 13 is vertically arranged on the upper surface of the aeration ring 10, and the air inlet pipe 13 is positioned inside the reaction chamber 2; the inner cavity of the reactor main body 1 is also provided with a heating device 6; the lighting device 5 is arranged right above the reaction chamber 2 through a bracket 7, and the bracket 7 is arranged on the outer side wall of the reactor main body 1;
a cover body 4 is arranged right above the reactor main body 1, a plurality of first through holes 4-1 and a second through hole 4-2 are arranged on the cover body 4, each first through hole 4-1 is correspondingly arranged right above each reaction chamber 2, the heating device 6 penetrates through the second through holes 4-2, and the cover body 4 is positioned below the lighting device 5.
The use method of the integrated photobioreactor for efficiently treating and quickly harvesting the rare earth tail water by the flocculated microalgae comprises the following steps:
firstly, water is introduced into the reactor main body 1 and is positioned outside the reaction chamber 2 to form a water bath area 3, the cover body 4 is covered, the heating device 6 is opened until the water temperature in the water bath area 3 is 25-37 ℃, and the influence of the temperature on the treatment efficiency of the flocculating microalgae can be explored;
secondly, the centrifuged flocculation concentrated algae liquid (1.5)<OD680<3) Adding the mixture into a reaction chamber 2, adding high-ammonia-nitrogen rare earth tailing tail water to be treated, turning on a lighting device 5 to illuminate the reaction chamber 2, introducing air into an air inlet pipe 13, and aerating the interior of the reaction chamber 2 through an aeration ring 10;
thirdly, sampling at a water outlet 8 to determine a correlation value, closing the lighting device 5 after ammonia nitrogen reaches a discharge standard, stopping aeration, opening a water outlet 9 to collect clarified algae liquid at the upper end after the algae liquid is stood still in the separation device 11 for layering, and then opening a first valve 14 to collect concentrated algae liquid from an opening at the bottom of an algae liquid discharge pipe 12; the light intensity of the lighting device 5 can be adjusted, and the influence of the illumination intensity on the treatment efficiency of the flocculent microalgae can be explored; the aeration quantity is reasonably adjusted, and the influence of the aeration quantity on the treatment efficiency of the flocculating microalgae can be explored.
The invention has the advantages that:
1. the device of the invention integrates the high-efficiency treatment of the rare earth tail water and the quick harvest of the flocculent microalgae;
2. the device can carry out independent experiments by arranging a plurality of reaction chambers 2, and can adjust the illumination intensity and the aeration quantity to facilitate the optimization and test of various process parameters, thereby providing data support for practical application;
3. the device of the invention improves the operability of actual wastewater treatment by exploring the applicable conditions of flocculating the microalgae.
Drawings
FIG. 1 is a schematic front view of an integrated photobioreactor for efficiently treating and rapidly harvesting rare earth tail water by using flocculated microalgae according to a first embodiment (a cover 4 is not shown);
FIG. 2 is a top view of FIG. 1;
fig. 3 is a plan view of the lid 4 according to the first embodiment.
Detailed Description
The first embodiment is as follows: the embodiment is an integrated photobioreactor for efficiently treating and quickly harvesting rare earth tail water by flocculating microalgae, and as shown in fig. 1-3, the integrated photobioreactor specifically comprises a reactor main body 1, a reaction chamber 2, a cover body 4, a lighting device 5, a heating device 6, a support 7, a water outlet 8, a water outlet 9, an aeration ring 10, a separation device 11, an algae liquid discharge pipe 12, an air inlet pipe 13, a first valve 14, a second valve 15 and a third valve;
a plurality of reaction chambers 2 are uniformly fixed on the bottom surface of the inner cavity of the reactor main body 1, a separation device 11 is arranged at the bottom of each reaction chamber 2, the separation device 11 is arranged below the bottom surface of the reactor main body 1, the separation device 11 is of a hollow conical structure, the end with a larger opening is arranged above, and the inner cavity of the separation device 11 is communicated with the inner cavity of each reaction chamber 2; the bottom of the separation device 11 is communicated with an algae liquid discharge pipe 12, a water outlet 9 is arranged at the center of the algae liquid discharge pipe 12 in the height direction, and a third valve is arranged on the water outlet 9; a first valve 14 is arranged at the bottom of the algae liquid discharge pipe 12; two water outlets 8 are formed in the outer wall of each reaction chamber 2, the two water outlets 8 are arranged up and down, the water outlets 8 penetrate through the side wall of the reactor main body 1, a second valve 15 is arranged on each water outlet 8, and the second valve 15 is arranged outside the reactor main body 1;
an aeration ring 10 is arranged on the inner side wall of the separation device 11, an aeration opening of the aeration ring 10 faces upwards, an air inlet of the aeration ring 10 is communicated with an air outlet of an air inlet pipe 13, the air inlet pipe 13 is vertically arranged on the upper surface of the aeration ring 10, and the air inlet pipe 13 is positioned inside the reaction chamber 2; the inner cavity of the reactor main body 1 is also provided with a heating device 6; the lighting device 5 is arranged right above the reaction chamber 2 through a bracket 7, and the bracket 7 is arranged on the outer side wall of the reactor main body 1;
a cover body 4 is arranged right above the reactor main body 1, a plurality of first through holes 4-1 and a second through hole 4-2 are arranged on the cover body 4, each first through hole 4-1 is correspondingly arranged right above each reaction chamber 2, the heating device 6 penetrates through the second through holes 4-2, and the cover body 4 is positioned below the lighting device 5.
The application method of the integrated photobioreactor for efficiently treating and quickly harvesting the rare earth tail water by the flocculated microalgae comprises the following steps:
firstly, water is introduced into the reactor main body 1 and is positioned outside the reaction chamber 2 to form a water bath area 3, the cover body 4 is covered, the heating device 6 is opened until the water temperature in the water bath area 3 is 25-37 ℃, and the influence of the temperature on the treatment efficiency of the flocculating microalgae can be explored;
secondly, the centrifuged flocculation concentrated algae liquid (1.5)<OD680<3) Adding the mixture into a reaction chamber 2, adding high-ammonia-nitrogen rare earth tailing tail water to be treated, turning on a lighting device 5 to illuminate the reaction chamber 2, introducing air into an air inlet pipe 13, and aerating the interior of the reaction chamber 2 through an aeration ring 10;
thirdly, sampling at a water outlet 8 to determine a correlation value, closing the lighting device 5 after ammonia nitrogen reaches a discharge standard, stopping aeration, opening a water outlet 9 to collect clarified algae liquid at the upper end after the algae liquid is stood still in the separation device 11 for layering, and then opening a first valve 14 to collect concentrated algae liquid from an opening at the bottom of an algae liquid discharge pipe 12; the light intensity of the lighting device 5 can be adjusted, and the influence of the illumination intensity on the treatment efficiency of the flocculent microalgae can be explored; the aeration quantity is reasonably adjusted, and the influence of the aeration quantity on the treatment efficiency of the flocculating microalgae can be explored.
The advantages of this embodiment:
1. the device of the embodiment integrates the high-efficiency treatment of the rare earth tail water and the quick harvesting of the flocculent microalgae;
2. the device of the embodiment can carry out independent experiments by arranging a plurality of reaction chambers 2, can adjust the illumination intensity and the aeration quantity to facilitate the optimization and test of various process parameters, and provides data support for practical application;
3. the device of the embodiment improves the operability of actual wastewater treatment by exploring the applicable conditions of flocculating the microalgae.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: the reaction chamber 2 is of a cylindrical structure, and the ratio of the height to the diameter is 1: 1. The rest is the same as the first embodiment.
The third concrete implementation mode: the second embodiment is different from the first embodiment in that: the opening diameter of the reaction chamber 2 is equal to the diameter of the first through hole 4-1. The rest is the same as the second embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: the reactor body 1 is made of transparent PMMA, and the light transmittance is more than 92%. The rest is the same as one of the first to third embodiments.
The fifth concrete implementation mode: the fourth difference between this embodiment and the specific embodiment is that: the reactor main body 1 is of a cuboid structure, and the length-width ratio is 3: 1. The rest is the same as the fourth embodiment.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: the lighting device 5 is an LED lamp tube. The rest is the same as one of the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: the heating device 6 is a heating rod. The rest is the same as one of the first to sixth embodiments.
The invention was verified with the following tests:
test one: the experiment is an integrated photobioreactor for efficiently treating and quickly harvesting rare earth tail water by flocculating microalgae, and as shown in fig. 1-3, the integrated photobioreactor specifically comprises a reactor main body 1, a reaction chamber 2, a cover body 4, a lighting device 5, a heating device 6, a support 7, a water outlet 8, a water outlet 9, an aeration ring 10, a separation device 11, an algae liquid discharge pipe 12, an air inlet pipe 13, a first valve 14, a second valve 15 and a third valve; the reaction chamber 2 is of a cylindrical structure, and the ratio of the height to the diameter is 1: 1; the diameter of the opening of the reaction chamber 2 is equal to the diameter of the first through hole 4-1; the reactor body 1 is made of transparent PMMA material, and the light transmittance is more than 92%; the reactor main body 1 is of a cuboid structure, and the length-width ratio is 3: 1; the lighting device 5 is an LED lamp tube; the heating device 6 is a heating rod;
a plurality of reaction chambers 2 are uniformly fixed on the bottom surface of the inner cavity of the reactor main body 1, a separation device 11 is arranged at the bottom of each reaction chamber 2, the separation device 11 is arranged below the bottom surface of the reactor main body 1, the separation device 11 is of a hollow conical structure, the end with a larger opening is arranged above, and the inner cavity of the separation device 11 is communicated with the inner cavity of each reaction chamber 2; the bottom of the separation device 11 is communicated with an algae liquid discharge pipe 12, a water outlet 9 is arranged at the center of the algae liquid discharge pipe 12 in the height direction, and a third valve is arranged on the water outlet 9; a first valve 14 is arranged at the bottom of the algae liquid discharge pipe 12; two water outlets 8 are formed in the outer wall of each reaction chamber 2, the two water outlets 8 are arranged up and down, the water outlets 8 penetrate through the side wall of the reactor main body 1, a second valve 15 is arranged on each water outlet 8, and the second valve 15 is arranged outside the reactor main body 1;
an aeration ring 10 is arranged on the inner side wall of the separation device 11, an aeration opening of the aeration ring 10 faces upwards, an air inlet of the aeration ring 10 is communicated with an air outlet of an air inlet pipe 13, the air inlet pipe 13 is vertically arranged on the upper surface of the aeration ring 10, and the air inlet pipe 13 is positioned inside the reaction chamber 2; the inner cavity of the reactor main body 1 is also provided with a heating device 6; the lighting device 5 is arranged right above the reaction chamber 2 through a bracket 7, and the bracket 7 is arranged on the outer side wall of the reactor main body 1;
a cover body 4 is arranged right above the reactor main body 1, a plurality of first through holes 4-1 and a second through hole 4-2 are arranged on the cover body 4, each first through hole 4-1 is correspondingly arranged right above each reaction chamber 2, the heating device 6 penetrates through the second through holes 4-2, and the cover body 4 is positioned below the lighting device 5.
The application method of the experimental integrated photobioreactor for efficiently treating and quickly harvesting the rare earth tail water by the flocculated microalgae comprises the following steps:
firstly, water is introduced into the reactor main body 1 and is positioned outside the reaction chamber 2 to form a water bath area 3, the cover body 4 is covered, the heating device 6 is opened until the water temperature in the water bath area 3 is 25-37 ℃, and the influence of the temperature on the treatment efficiency of the flocculating microalgae can be explored;
secondly, the centrifuged flocculation concentrated algae liquid (1.5)<OD680<3) Adding the mixture into a reaction chamber 2, adding the tail water of the high-ammonia-nitrogen rare earth tailings to be treated, and turning on illuminationThe device 5 illuminates the reaction chamber 2, and the air is introduced into the air inlet pipe 13 to aerate the interior of the reaction chamber 2 through the aeration ring 10;
thirdly, sampling at a water outlet 8 to determine a correlation value, closing the lighting device 5 after ammonia nitrogen reaches a discharge standard, stopping aeration, opening a water outlet 9 to collect clarified algae liquid at the upper end after the algae liquid is stood still in the separation device 11 for layering, and then opening a first valve 14 to collect concentrated algae liquid from an opening at the bottom of an algae liquid discharge pipe 12; the light intensity of the lighting device 5 can be adjusted, and the influence of the illumination intensity on the treatment efficiency of the flocculent microalgae can be explored; the aeration quantity is reasonably adjusted, and the influence of the aeration quantity on the treatment efficiency of the flocculating microalgae can be explored.
The advantages of this test:
1. the experimental device integrates the high-efficiency treatment of the rare earth tail water and the quick harvesting of the flocculent microalgae;
2. the experimental device can carry out independent experiments by arranging a plurality of reaction chambers 2, and can adjust the illumination intensity and the aeration quantity to facilitate the optimization and test of various process parameters, thereby providing data support for practical application;
3. the experimental device improves the operability of actual wastewater treatment by exploring the applicable conditions of flocculating the microalgae.
Claims (7)
1. An integrated photobioreactor for efficiently treating and quickly harvesting rare earth tail water by flocculating microalgae is characterized by comprising a reactor main body (1), a reaction chamber (2), a cover body (4), lighting equipment (5), a heating device (6), a support (7), a water outlet (8), a water outlet (9), an aeration ring (10), a separation device (11), an algae liquid discharge pipe (12), an air inlet pipe (13), a first valve (14), a second valve (15) and a third valve;
a plurality of reaction chambers (2) are uniformly fixed on the bottom surface of the inner cavity of the reactor main body (1), a separation device (11) is arranged at the bottom of each reaction chamber (2), the separation device (11) is arranged below the bottom surface of the reactor main body (1), the separation device (11) is of a hollow conical structure, the end with a larger opening is arranged above the separation device, and the inner cavity of the separation device (11) is communicated with the inner cavity of each reaction chamber (2); the bottom of the separation device (11) is communicated with an algae liquid discharge pipe (12), the center of the algae liquid discharge pipe (12) in the height direction is provided with a water outlet (9), and a third valve is arranged on the water outlet (9); a first valve (14) is arranged at the bottom of the algae liquid discharge pipe (12); two water outlets (8) are formed in the outer wall of each reaction chamber (2), the two water outlets (8) are arranged up and down, the water outlets (8) penetrate out of the side wall of the reactor main body (1), a second valve (15) is arranged on each water outlet (8), and the second valve (15) is arranged outside the reactor main body (1);
an aeration ring (10) is arranged on the inner side wall of the separation device (11), an aeration opening of the aeration ring (10) faces upwards, an air inlet of the aeration ring (10) is communicated with an air outlet of an air inlet pipe (13), the air inlet pipe (13) is vertically arranged on the upper surface of the aeration ring (10), and the air inlet pipe (13) is positioned inside the reaction chamber (2); the inner cavity of the reactor main body (1) is also provided with a heating device (6); the lighting device (5) is arranged right above the reaction chamber (2) through a bracket (7), and the bracket (7) is arranged on the outer side wall of the reactor main body (1);
a cover body (4) is arranged right above a reactor main body (1), a plurality of first through holes (4-1) and a second through hole (4-2) are arranged on the cover body (4), each first through hole (4-1) is correspondingly arranged right above each reaction chamber (2), a heating device (6) penetrates through the second through holes (4-2), and the cover body (4) is located below a lighting device (5).
2. The photobioreactor as claimed in claim 1, wherein the reaction chamber (2) is cylindrical and has a height to diameter ratio of 1: 1.
3. The photobioreactor as claimed in claim 1, wherein the diameter of the opening of the reaction chamber (2) is equal to the diameter of the first through hole (4-1).
4. The integrated photobioreactor for efficiently treating and rapidly harvesting rare earth tail water by using flocculated microalgae according to claim 1, wherein the reactor body (1) is made of transparent PMMA (polymethyl methacrylate) and has light transmittance of more than 92%.
5. The integrated photobioreactor for efficiently treating and rapidly harvesting rare earth tail water by using flocculated microalgae according to claim 1, wherein the reactor main body (1) is of a cuboid structure, and the length-width ratio is 3: 1.
6. The photobioreactor as claimed in claim 1, wherein the lighting device (5) is an LED lamp tube.
7. The photobioreactor as claimed in claim 1, wherein the heating device (6) is a heating rod.
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Application publication date: 20210608 |