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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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 40
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 35
- 238000003306 harvesting Methods 0.000 title claims abstract description 25
- 230000003311 flocculating effect Effects 0.000 title abstract description 16
- 238000005273 aeration Methods 0.000 claims abstract description 40
- 238000000926 separation method Methods 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims description 31
- 241000195493 Cryptophyta Species 0.000 claims description 30
- 239000000463 material Substances 0.000 claims description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 3
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 3
- 238000004065 wastewater treatment Methods 0.000 abstract description 10
- 239000002351 wastewater Substances 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000005484 gravity Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 238000005286 illumination Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 238000005189 flocculation Methods 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 241000894007 species Species 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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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
- 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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- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
一种絮凝微藻对稀土尾水高效处理与快速收获的一体化光生物反应器，涉及一种对稀土尾水处理与收获的光生物反应器。本发明是要解决现有的稀土尾矿废水处理方法成本高、废水处理体积相对较小，微藻处理废水后微藻不便回收的技术问题。本发明通过恒温水浴加热、照明设备和曝气装置来调节外部条件对于絮凝微藻生长的影响，解决了现存的共絮凝性微藻与废水分离及回收的问题，通过打开各出水口的旋钮，利用重力流实现微藻与处理后的废水进行分离。本发明通过多级出水口排液提高了微藻回收的效能。本发明的装置集稀土尾水的高效处理与絮凝性微藻的快速收获于一体。
An integrated photobioreactor for efficient treatment and rapid harvest of rare earth tail water by flocculated microalgae relates to a photobioreactor for the treatment and harvest of rare earth tail water. The invention aims to solve the technical problems that the existing rare earth tailings wastewater treatment method has high cost, relatively small wastewater treatment volume, and inconvenient recovery of microalgae after the wastewater is treated by microalgae. The present invention adjusts the influence of external conditions on the growth of flocculated microalgae through constant temperature water bath heating, lighting equipment and aeration device, and solves the existing problems of separation and recovery of co-flocculating microalgae and wastewater. Gravity flow is used to separate microalgae from treated wastewater. The invention improves the efficiency of microalgae recovery through multi-stage water outlet drainage. The device of the invention integrates the efficient treatment of rare earth tail water and the rapid harvest of flocculating 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)
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