CN111087126A - Device for treating nitrogen and phosphorus-rich wastewater by using microalgae - Google Patents
Device for treating nitrogen and phosphorus-rich wastewater by using microalgae Download PDFInfo
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- CN111087126A CN111087126A CN201911306632.XA CN201911306632A CN111087126A CN 111087126 A CN111087126 A CN 111087126A CN 201911306632 A CN201911306632 A CN 201911306632A CN 111087126 A CN111087126 A CN 111087126A
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F7/00—Aeration of stretches of water
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- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a device for treating nitrogen-phosphorus-rich wastewater by utilizing microalgae, which comprises a sedimentation tank and a microalgae culture tank fixed above the sedimentation tank through a support frame; a plurality of culture units arranged side by side are arranged in the microalgae culture tank, and each culture unit is formed by enclosing two membrane components arranged oppositely; each membrane module comprises a supporting layer, a water storage layer and a filtering layer, and also comprises an annular wall fixedly connected with the supporting layer; the microalgae are laid on the filter layer for culture; the microalgae culture tank is also internally provided with a central pipeline, the central pipeline passes through each culture unit and penetrates through the whole microalgae culture tank, and the central pipeline is provided with a through hole at each culture unit; two ends of the central pipeline are respectively communicated with the sedimentation tank through pipelines, and a water inlet pump is arranged on each pipeline; two ends of the central pipeline are also respectively connected with the aeration device through air pipes, and the air pipes are provided with pneumatic butterfly valves; two ends of the microalgae culture tank are respectively provided with a water outlet, and the water outlet is provided with an electromagnetic valve.
Description
Technical Field
The invention relates to a device for treating nitrogen and phosphorus-rich wastewater by using microalgae, belonging to the technical field of sewage purification.
Background
Excessive discharge of domestic sewage, nitrogen-phosphorus-rich aquaculture wastewater and industrial wastewater causes N, P and organic carbon in natural water to be seriously out of standard. N, P, etc. are the main pollutants for water eutrophication. Although the existing sewage treatment process can remove most of nitrogen and phosphorus in the water body, the residual small amount of N, P still causes eutrophication of the water body. Meanwhile, the existing chemical and biological sewage treatment process has the problems of large floor area, long retention time, low removal rate, high cost and the like. Therefore, it is of great significance to find a nitrogen and phosphorus rich wastewater treatment device with high efficiency, small occupied area and low cost. Research shows that microalgae can perform photosynthesis by using elements such as N, P under the condition of light and convert the microalgae into nutrients necessary for growth and propagation of the microalgae. Thus, the use of microalgae for wastewater treatment has received much attention. In addition, the traditional microalgae culture method needs to be carried out in water. Because the cell volume of the microalgae is small, the cell water content is large, the cell density is close to that of water, and the culture concentration is small, a large amount of energy is needed to separate the microalgae cells from water in the microalgae harvesting process, and the harvesting energy consumption of the microalgae in the traditional microalgae culture mode accounts for 20% -30% of the total energy consumption of the microalgae culture.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the technical problem of providing a device for treating nitrogen and phosphorus-rich wastewater by using microalgae, which not only can efficiently remove elements such as N, P in the wastewater to be treated, but also can realize efficient culture of the microalgae, and the culture method effectively improves the culture efficiency of the microalgae and reduces the harvesting cost of the microalgae.
In order to solve the technical problems, the technical means adopted by the invention are as follows:
a device for treating nitrogen-phosphorus-rich wastewater by utilizing microalgae comprises a sedimentation tank and a microalgae culture tank fixed above the sedimentation tank through a support frame; a plurality of culture units arranged side by side are arranged in the microalgae culture tank, and each culture unit is formed by enclosing two membrane components arranged oppositely; each membrane module comprises a supporting layer, a water storage layer and a filtering layer, and also comprises an annular wall fixedly connected with the supporting layer; the microalgae are laid on the filter layer for culture; the microalgae culture tank is also internally provided with a central pipeline, the central pipeline passes through each culture unit and penetrates through the whole microalgae culture tank, and the central pipeline is provided with a through hole at each culture unit; two ends of the central pipeline are respectively communicated with the sedimentation tank through pipelines, and a water inlet pump is arranged on each pipeline; two ends of the central pipeline are also respectively connected with the aeration device through air pipes, and the air pipes are provided with pneumatic butterfly valves; two ends of the microalgae culture tank are respectively provided with a water outlet, and the water outlet is provided with an electromagnetic valve.
The microalgae culture tank is a transparent tank body and is made of organic glass or glass, and the microalgae culture tank is formed by splicing a plurality of cylindrical tank bodies.
Wherein, a lighting device is arranged in the central pipeline; the illuminating device is fixed on a central axis of the central pipeline through a support and comprises a protective shell, a light source and a battery, wherein the light source and the battery are arranged in the protective shell, the light source is an LED or a fluorescent lamp, and the light source is powered by the battery.
Wherein, the filter layer is a cellulose acetate membrane or a PVC membrane, the water storage layer is a porous water storage layer made of polyurethane sponge or polyvinyl alcohol, and the support layer is a porous support layer made of carbon materials, stainless steel materials or PMMA.
Wherein, still include the PLC control box, intake pump, pneumatic butterfly valve and solenoid valve are connected with the PLC control box through wireless communication mode respectively.
Has the advantages that: on one hand, the device can efficiently remove elements such as N, P in the sewage to be treated; on the other hand, the device can realize the culture of the microalgae, and can overcome the problems of small growth density, large occupied area, difficult harvesting and the like in the existing microalgae culture.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for treating nitrogen-phosphorus-rich wastewater by using microalgae according to the present invention;
FIG. 2 is a schematic structural view of a membrane module in which microalgae are laid in the apparatus of the present invention;
FIG. 3 is an exploded view of FIG. 2;
FIG. 4 is a schematic view of the structure of a culture unit.
Detailed Description
The technical solutions of the present invention are further described below with reference to the accompanying drawings, but the scope of the present invention is not limited thereto.
As shown in fig. 1-4, the device for treating nitrogen-phosphorus-rich wastewater by using microalgae comprises a sedimentation tank 1 and a microalgae culture tank 7 fixed above the sedimentation tank 1 through a support frame 24, wherein the tank body of the microalgae culture tank 7 is transversely arranged (cover plates are arranged at two ends of the tank body, and through holes for a central pipeline 8 to pass through are formed in the cover plates); a plurality of culture units 14 arranged side by side are arranged in the microalgae culture tank 7, each culture unit 14 is formed by enclosing two membrane components 25 arranged oppositely, an enclosed cavity 28 is a closed cavity, each membrane component 25 is a supporting layer 11, a water storage layer 12 and a filtering layer 13 in sequence from outside to inside relative to the closed cavity, the membrane component 25 further comprises annular walls (29, 30) fixedly connected with the supporting layer 11, the annular walls (29, 30) are made of transparent materials, and can be made of plastic materials, the annular wall 29 of one membrane module 25 is connected with the annular wall 30 of the other membrane module 25 in a clamping and embedding manner or in a mutually matched manner of internal and external threads (detachable connection), so that the culture unit 14 is enclosed to form a hollow cavity 28, and the microalgae 22 is laid on the filter layer 13 for culture (in the culture process, the microalgae can fall from the filter layer 13 into the cavity 28); the microalgae culture tank 7 is also internally provided with a central pipeline 8, the central pipeline 8 extends into the microalgae culture tank 7 from one end and penetrates out of the other end of the microalgae culture tank 7, the central pipeline 8 penetrates through each culture unit 14 and penetrates through the whole microalgae culture tank 7, a through hole 9 is formed in each culture unit 14 of the central pipeline 8, and the central pipeline 8 is provided with a hole in each culture unit 14 so as to inject sewage and air blowing into the culture unit 14; two ends of the central pipeline 8 are respectively communicated with the sedimentation tank 1 through pipelines, and the pipelines are provided with water inlet pumps (4, 18); two ends of the central pipeline 8 are also respectively connected with an aeration device 10 through air pipes, and pneumatic butterfly valves (6, 16) are arranged on the air pipes; two ends of the microalgae culture tank 7 are respectively provided with a water outlet (3, 19), and electromagnetic valves (2, 20) are arranged at the water outlets (3, 19).
The water in the sedimentation tank 1 is domestic sewage, aquaculture wastewater or industrial wastewater rich in nitrogen and phosphorus to be treated, the nitrogen and phosphorus-rich wastewater is slowly settled in the sedimentation tank 1 and then pumped into the central pipeline 8 by a high-pressure water pump, and meanwhile, air is blown into the central pipeline 8 by an aeration device 10, such as an air compressor, an air pump and the like. The microalgae culture tank 7 is a transparent tank body made of transparent materials such as organic glass or glass, and the microalgae culture tank 7 can be formed by splicing a plurality of cylindrical tank bodies. The membrane module 25 is composed of a filter layer 13, a water storage layer 12 and a support layer 11, wherein the filter layer 13 is a filter membrane made of a cellulose acetate membrane or a microfiltration membrane such as a PVC membrane, the water storage layer 12 is a porous water storage material made of a water absorption sponge such as polyurethane sponge or polyvinyl alcohol, the support layer 11 is used for supporting the filter membrane layer and the sponge layer, and the support layer 11 is a porous support material made of a carbon material, a stainless steel material or PMMA.
A lighting device 15 is arranged in the central pipeline 8; the lighting device 15 is fixed on the central axis of the central pipeline 8 through a support 23, the lighting device 15 comprises a protective shell, and a light source and a battery which are arranged in the protective shell, the light source is an LED or a fluorescent lamp, and the light source is powered by the battery.
The device for treating nitrogen and phosphorus-rich wastewater by using microalgae further comprises a PLC control box, wherein the water inlet pumps (4, 18), the pneumatic butterfly valves (6, 16) and the electromagnetic valves (2, 20) are respectively connected with the PLC control box in a wireless communication mode. The inlet and outlet conversion is realized through a PLC control box to prevent the blockage of a filtering membrane in the membrane component 25, when the water inlet pump 4 is started and the pneumatic butterfly valve 6 and the electromagnetic valve 20 are opened, the water inlet pump 18, the pneumatic butterfly valve 16 and the electromagnetic valve 2 need to be closed, at the moment, gas and wastewater to be treated simultaneously enter the tank body from one side of the central pipeline 8, and after the treatment of the multistage culture unit 14, the treated water is discharged out of the tank body from the water outlet 19; when the water inlet pump 18, the pneumatic butterfly valve 16 and the electromagnetic valve 2 are started, the water inlet pump 4, the pneumatic butterfly valve 6 and the electromagnetic valve 20 need to be closed, gas and wastewater to be treated simultaneously enter the tank body from the opposite side of the central pipeline 8, and the treated water is discharged out of the tank body from the water outlet 3 after being treated by the multi-stage culture unit 14.
The device carries out microalgae culture in the culture units 14, elements such as nitrogen, phosphorus and the like in the sewage are fixed and absorbed by the microalgae, and then the sewage enters a cavity between the two culture units 14 through the microfiltration membrane and then permeates into the next culture unit 14. After the sewage is combined by the single-stage and multi-stage culture units 14, nitrogen and phosphorus in the nitrogen and phosphorus rich wastewater are absorbed for many times and then are discharged to the sedimentation tank 1 through the water outlet. After the sewage is treated for a sufficient retention time, the discharge standard is met, the circulation of the sewage is stopped, at the moment, the tank body 7 is taken down from the support frame 24, the central pipeline 8 is taken out, the cover plate at the end part of the tank body 7 is opened, other connected pipelines are taken down, the tank body 7 is erected, the culture unit 14 in the tank body 7 slides to the bottom of the tank body, the tank body 7 is laid down, the culture unit 14 is taken out, two annular walls of each culture unit 14 are opened, the microalgae concentrated solution in the culture unit 14 is released (the microalgae concentrated solution is discharged into the microalgae collection pool 21), and the microalgae is collected for other applications.
The device can culture microalgae and realize treatment of nitrogen-phosphorus-rich wastewater, industrial wastewater, domestic sewage and the like are subjected to sedimentation pretreatment through the sedimentation tank 1, pre-sedimentation wastewater is pumped into a microalgae culture unit containing algae seeds through the high-pressure water pump, the microalgae are fixed in the culture unit 14 through the closed cavity 28, and when the microalgae grow to a certain cell concentration, a microalgae concentrated solution in the culture unit 14 is released. At the moment, nutrients such as N, P in the wastewater in the sedimentation tank 1 are effectively removed through the combined use of the multi-stage culture units and the circulation of the wastewater, meanwhile, the algae liquid can not only draw the nutrients in the water in the culture process after being immobilized and cultured, but also avoid the dehydration process in the subsequent microalgae harvesting process, well realize the separation of algae and water, reduce the harvesting cost, and compared with the problem that the illumination radiation range is limited in the water body culture, the device can effectively improve the utilization efficiency of the microalgae culture on illumination.
Table 1 shows the comparison of the yield of microalgae per unit area after the cultivation in the present invention and the existing suspension cultivation
Table 2 shows the comparison of efficiency and energy consumption of harvesting microalgae after the culture method of the present invention and the existing culture method
Table 3 shows the concentration of N, P element in the feed water and the concentration of N, P element in the water discharged after the treatment by the device of the invention
| Waste water component | Concentration of influent water | Concentration of effluent | Removal rate |
| TN | 3000-4000 | 25-50 | 240-330 ppm/day |
| TP | 50-100 | 5-10 | 3.75-7.5 ppm/day |
Claims (5)
1. A device for treating nitrogen-phosphorus-rich wastewater by using microalgae is characterized in that: comprises a sedimentation tank and a microalgae culture tank fixed above the sedimentation tank through a support frame; a plurality of culture units arranged side by side are arranged in the microalgae culture tank, and each culture unit is formed by enclosing two membrane components arranged oppositely; each membrane module comprises a supporting layer, a water storage layer and a filtering layer, and also comprises an annular wall fixedly connected with the supporting layer; the microalgae are laid on the filter layer for culture; the microalgae culture tank is also internally provided with a central pipeline, the central pipeline passes through each culture unit and penetrates through the whole microalgae culture tank, and the central pipeline is provided with a through hole at each culture unit; two ends of the central pipeline are respectively communicated with the sedimentation tank through pipelines, and a water inlet pump is arranged on each pipeline; two ends of the central pipeline are also respectively connected with the aeration device through air pipes, and the air pipes are provided with pneumatic butterfly valves; two ends of the microalgae culture tank are respectively provided with a water outlet, and the water outlet is provided with an electromagnetic valve.
2. The apparatus for treating nitrogen and phosphorus-rich wastewater by using microalgae according to claim 1, wherein: the microalgae culture tank is a transparent tank body and is made of organic glass or glass, and the microalgae culture tank is formed by splicing a plurality of cylindrical tank bodies.
3. The apparatus for treating nitrogen and phosphorus-rich wastewater by using microalgae according to claim 1, wherein: a lighting device is arranged in the central pipeline; the illuminating device is fixed on a central axis of the central pipeline through a support and comprises a protective shell, a light source and a battery, wherein the light source and the battery are arranged in the protective shell, the light source is an LED or a fluorescent lamp, and the light source is powered by the battery.
4. The apparatus for treating nitrogen and phosphorus-rich wastewater by using microalgae according to claim 1, wherein: the filtering layer is a cellulose acetate membrane or a PVC membrane, the water storage layer is a porous water storage layer made of polyurethane sponge or polyvinyl alcohol, and the supporting layer is a porous supporting layer made of carbon materials, stainless steel materials or PMMA.
5. The apparatus for treating nitrogen and phosphorus-rich wastewater by using microalgae according to claim 1, wherein: still include the PLC control box, intake pump, pneumatic butterfly valve and solenoid valve are connected with the PLC control box through wireless communication mode respectively.
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| CN201911306632.XA CN111087126B (en) | 2019-12-17 | 2019-12-17 | Device for treating nitrogen and phosphorus-rich wastewater by using microalgae |
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| CN201911306632.XA CN111087126B (en) | 2019-12-17 | 2019-12-17 | Device for treating nitrogen and phosphorus-rich wastewater by using microalgae |
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| CN111087126A true CN111087126A (en) | 2020-05-01 |
| CN111087126B CN111087126B (en) | 2022-06-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112522109A (en) * | 2020-12-23 | 2021-03-19 | 四川清和科技有限公司 | Microalgae immobilization method, immobilized microalgae and application in water pollution treatment |
| CN114620835A (en) * | 2022-03-03 | 2022-06-14 | 济南市环境研究院(济南市黄河流域生态保护促进中心) | Nitrogen and phosphorus capturing device and method for sewage treatment |
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| CN101906380A (en) * | 2010-08-11 | 2010-12-08 | 孙以川 | Seal type pipeline culture device of bait microalgae and microalgae pipeline culture method |
| CN109456885A (en) * | 2018-11-30 | 2019-03-12 | 安徽农业大学 | A kind of automatically cleaning fluidized bed bioreactor |
| CN109761372A (en) * | 2019-04-02 | 2019-05-17 | 百靖达环保科技(昆山)有限公司 | A kind of microalgae processing unit and method that sewage deep is denitrogenated |
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2019
- 2019-12-17 CN CN201911306632.XA patent/CN111087126B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101906380A (en) * | 2010-08-11 | 2010-12-08 | 孙以川 | Seal type pipeline culture device of bait microalgae and microalgae pipeline culture method |
| CN109456885A (en) * | 2018-11-30 | 2019-03-12 | 安徽农业大学 | A kind of automatically cleaning fluidized bed bioreactor |
| CN109761372A (en) * | 2019-04-02 | 2019-05-17 | 百靖达环保科技(昆山)有限公司 | A kind of microalgae processing unit and method that sewage deep is denitrogenated |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112522109A (en) * | 2020-12-23 | 2021-03-19 | 四川清和科技有限公司 | Microalgae immobilization method, immobilized microalgae and application in water pollution treatment |
| CN112522109B (en) * | 2020-12-23 | 2021-11-16 | 四川清和科技有限公司 | Microalgae immobilization method, immobilized microalgae and application in water pollution treatment |
| CN114620835A (en) * | 2022-03-03 | 2022-06-14 | 济南市环境研究院(济南市黄河流域生态保护促进中心) | Nitrogen and phosphorus capturing device and method for sewage treatment |
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| CN111087126B (en) | 2022-06-07 |
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