Device for treating livestock and poultry breeding wastewater through microalgae

Abstract

The utility model belongs to the technical field of microalgae culture and culture wastewater treatment, and particularly relates to a device for treating livestock and poultry culture wastewater by using microalgae, aiming at solving the problems that culture facilities are outdated, a large-scale culture technology is lacked and the like when the culture wastewater is treated by using the microalgae in the prior art. In order to solve the problem that industrial algae culture facilities and equipment are lack of related research, the utility model provides the following scheme: the device comprises an environment regulation and control system, a pumping system, and a pretreatment device, an airlift photobioreactor and a microalgae culture raceway pond which are sequentially connected with the pumping system; and the gas filtering aeration device and the environment regulation and control system are arranged on one side of the airlift photobioreactor and the microalgae culture raceway pond. According to the utility model, the problems of large-scale culture and standardized industrial microalgae culture production are solved; c, N, P and other nutrients in the culture wastewater are captured in an ecological chain manner and converted into microalgae products with high added values, so that resource utilization of the culture wastewater is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of microalgae cultivation and cultivation wastewater treatment, in particular to a device for treating livestock and poultry cultivation wastewater by using microalgae. BACKGROUND

[0002] Livestock and poultry cultivation wastewater is rich in a large amount of organic matter and nutrients such as TN and TP. If it is discharged without treatment, it will cause serious pollution to the environment. The traditional methods for treating livestock and poultry cultivation wastewater include coagulation and sedimentation technology, catalytic oxidation technology, adsorption technology, anaerobic and aerobic biological treatment technology, and chemical treatment. Although the above methods have high treatment efficiency, low chemical agent consumption, and meet the requirements of clean production, they need to supplement energy, the nutrients in the wastewater cannot be recycled, and greenhouse gas emissions will also occur. Compared with physical and chemical treatment, activated sludge method is a low-cost alternative method, which has high treatment efficiency and low cost, but sludge corruption and swelling may occur during treatment, thereby affecting the effect of wastewater treatment, and a large amount of residual sludge will also increase the subsequent treatment cost.

[0003] The market and related research of microalgae carbon fixation technology are gradually mature. Livestock and poultry wastewater contains a large amount of nitrogen, phosphorus and organic matter, which provides sufficient nitrogen and carbon sources and other nutritional needs for the growth and reproduction of microalgae. At the same time, the content of C, N and P in the cultivation wastewater can be effectively reduced during the growth and reproduction of microalgae, which promotes resource recycling and also adsorbs or degrades pollutants such as heavy metals and antibiotics in the cultivation wastewater, thereby reducing the organic load of the cultivation wastewater, so as to achieve the dual effect of treating the cultivation wastewater and cultivating microalgae.

[0004] In the prior art, the use of microalgae to treat cultivation wastewater also faces problems such as backward cultivation facilities and lack of large-scale cultivation technology. There is also a lack of related research on industrialized algae cultivation facilities and equipment. CONTENT OF THE INVENTION

[0005] The purpose of the present application is to solve the problems in the prior art, such as the use of microalgae to treat cultivation wastewater, backward cultivation facilities, lack of large-scale cultivation technology, and lack of related research on industrialized algae cultivation facilities and equipment. A device for treating livestock and poultry cultivation wastewater by using microalgae is provided.

[0006] The device for treating livestock and poultry cultivation wastewater by using microalgae provided by the present application adopts the following technical solution:

[0007] The device for treating livestock and poultry cultivation wastewater by using microalgae comprises:

[0008] an environmental control system, a pumping system, a pretreatment device connected to the pumping system in sequence, a gas-lift photobioreactor, and a microalgae cultivation runway pool.

[0009] The gas filtering aeration device and the environmental regulation system are arranged on one side of the gas-lift photobioreactor and the microalgae breeding raceway pond.

[0010] Further, the pretreatment device comprises a dilution liquid storage cylinder and a disinfection and sterilization device, the inside of the dilution liquid storage cylinder is sequentially filled with a biological filtration layer and a sand filtration layer from top to bottom, and a pipeline is fixedly connected between the pretreatment device and the disinfection and sterilization device.

[0011] Further, the gas-lift photobioreactor comprises a liquid storage cylinder and a stirring mechanism and a lower hopper, and the stirring mechanism is located in the middle of the gas-lift photobioreactor.

[0012] Further, the microalgae breeding raceway pond comprises a breeding raceway pond and a plug flow device and a liquid circulation device arranged on one side of the breeding raceway pond, and a propeller is arranged on one side of the plug flow device.

[0013] Further, the liquid circulation device comprises a water inlet pipe arranged at the bottom of the breeding raceway pond and a water outlet pipe arranged at the top of the breeding raceway pond, and a plurality of spray heads are arranged at equal intervals in the inside of the water outlet pipe.

[0014] Further, the bottom of the gas-lift photobioreactor is provided with a plurality of nano aeration discs, the plurality of nano aeration discs are distributed at equal intervals in the bottom of the filtering aeration device with the stirring mechanism as the center, the bottom of the microalgae breeding raceway pond is provided with a plurality of aeration discs, and the plurality of aeration discs are arranged at equal intervals in the bottom of the microalgae breeding raceway pond.

[0015] Further, the environmental regulation system comprises a plurality of groups of lighting devices, temperature adjusting devices and PH adjusting devices arranged in the gas-lift photobioreactor and the breeding raceway pond, wherein a plurality of groups of the lighting devices are arranged in the gas-lift photobioreactor with the stirring mechanism as the center, and the other groups of the lighting devices are arranged at equal intervals at the top of the breeding raceway pond.

[0016] Further, the temperature adjusting device comprises a heating and heat preservation device and a cooling device, the PH adjusting device comprises a storage hopper, the bottom end of the storage hopper is connected with a peristaltic pump, and the bottom end of the peristaltic pump is connected with a pipeline.

[0017] In summary, the present application has at least one of the following beneficial technical effects:

[0018] 1. The present application forms a large-scale microalgae culture and breeding wastewater treatment comprehensive standardized production system by comprehensively combining the pretreatment device, the gas-lift photobioreactor and the breeding raceway pond with the liquid circulation device and the gas filtering aeration system, so as to meet the purpose of large-scale microalgae breeding and breeding wastewater treatment.

[0019] 2. The scheme keeps the algal liquid circulating flow in the raceway pond through the push wheel of the push flow device and the liquid circulation system, which is beneficial to keep the microalgae and nutrients in a suspended state, improve the light energy utilization efficiency and reduce the light inhibition, and also improve the exchange rate of carbon dioxide gas and accelerate the dissolution speed, which is beneficial to separate the oxygen produced by the microalgae photosynthesis from the algal liquid and reduce the inhibition of dissolved oxygen on the microalgae photosynthesis.

[0020] The utility model discloses, both realize the large-scale cultivation, the standardization industrialization microalgae breeding production problem, and the C, N, P of breeding wastewater's nutrient nutrient is captured and converted into the high value-added microalgae product in the mode of ecological chain, realizes the resource utilization of breeding wastewater. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A microalgae livestock and poultry breeding wastewater treatment device structure schematic view is provided for the utility model;

[0022] Figure 2 A gas lift type photobioreactor structure schematic view of a microalgae livestock and poultry breeding wastewater treatment device is provided for the utility model;

[0023] Figure 3 A microalgae breeding raceway pond structure schematic view of a microalgae livestock and poultry breeding wastewater treatment device is provided for the utility model;

[0024] Figure 4 A pretreatment device structure schematic view of a microalgae livestock and poultry breeding wastewater treatment device is provided for the utility model.

[0025] The drawings are as follows: 1, pretreatment device, 101, biological filtration layer, 102, sand filter layer, 103, disinfection and sterilization device, 2, pumping system, 3, gas lift type photobioreactor, 301, lower hopper, 302, stirring mechanism, 4, microalgae breeding raceway pond, 401, push flow device, 402, push wheel, 5, gas filter aeration device, 501, nano aeration disc, 6, lighting device, 7, temperature regulating device, 8, PH adjusting device, 801, storage hopper, 802, peristaltic pump, 803, pipeline, 9, liquid circulating device, 901, water inlet pipe, 902, water outlet pipe, 903, spray head. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0027] Embodiment one

[0028] Reference Figures 1-4The utility model provides a kind of microalgae processing livestock and poultry breeding wastewater device, comprising: environmental control system, pumping system 2 and the pretreatment device 1 of sequentially connecting pumping system 2, gas-lift photobioreactor 3, microalgae breeding runway pool 4;

[0029] Gas filter aeration device 5 and environmental control system are arranged at one side of gas-lift photobioreactor 3 and microalgae breeding runway pool 4.

[0030] Referring to Figure 1 And Figure 4 The pretreatment device 1 includes dilution liquid storage cylinder and disinfection and sterilization device 103, the inside of dilution liquid storage cylinder is filled with biological filter layer 101 and sand filter layer 102 from top to bottom in turn, and pipeline 803 is fixedly connected between pretreatment device 1 and disinfection and sterilization device 103.

[0031] Referring to Figure 2 Gas-lift photobioreactor 3 includes liquid storage cylinder and stirring mechanism 302 and lower hopper 301, the material of liquid storage cylinder of gas-lift photobioreactor 3 is light-transmitting acrylic, and stirring mechanism 302 is located in the middle of gas-lift photobioreactor 3.

[0032] Referring to Figure 3 Microalgae breeding runway pool 4 includes breeding runway pool and push flow device 401 and liquid circulation device 9 arranged at one side of breeding runway pool, and microalgae breeding runway pool 4 is made of PP, and push flow device 401 is provided with push wheel 402 at one side; liquid circulation device 9 includes water inlet pipe 901 arranged at the bottom of breeding runway pool and water outlet pipe 902 arranged at the top of breeding runway pool, and a plurality of nozzles 903 are arranged at equal intervals in the inside of water outlet pipe 902.

[0033] Referring to Figures 1-3 A plurality of nano aerators 501 are arranged at the bottom of gas-lift photobioreactor 3, the plurality of nano aerators 501 are distributed at equal intervals in the bottom of filter aeration device 5 with stirring mechanism 302 as the center, a plurality of aerators are arranged at the bottom of microalgae breeding runway pool 4, and the plurality of aerators are arranged at equal intervals in the bottom of microalgae breeding runway pool 4; environmental control system includes a plurality of groups of lighting devices 6, temperature adjusting device 7 and PH adjusting device 8 arranged in the inside of gas-lift photobioreactor 3 and breeding runway pool, wherein the plurality of groups of lighting devices 6 are arranged in the inside of gas-lift photobioreactor 3 with stirring mechanism 302 as the center, and the other groups of lighting devices 6 are arranged at equal intervals at the top of breeding runway pool.

[0034] Referring to Figure 2 Temperature adjusting device 7 includes heating and temperature maintaining device and cooling device, PH adjusting device 8 includes storage hopper 801, the bottom end of storage hopper 801 is connected with peristaltic pump 802, and the bottom end of peristaltic pump 802 is connected with pipeline 803.

[0035] The implementation principle of the device for treating livestock and poultry breeding wastewater by microalgae in the embodiment of the application is as follows: after the livestock and poultry breeding wastewater is subjected to solid-liquid separation and filtration and precipitation, the supernatant of the breeding wastewater is pumped into the pretreatment device 1 by a pumping system, and a disinfecting and sterilizing agent such as disinfecting powder, bleaching powder and the like is supplied by an external disinfecting and sterilizing device 103 to disinfect and sterilize the wastewater, and then the wastewater is filtered by a biological filtration layer 101 and a sand filtration layer 102 to remove macromolecular substances, and then the breeding wastewater is pumped to a gas-lift photobioreactor 3 by a pumping system 2, and microalgae are put into the gas-lift photobioreactor 3 through a lower hopper 301 to breed and expand the microalgae and treat the breeding wastewater.

[0036] After the carbon dioxide and air are subjected to gas filtration and aeration by a gas filtration and aeration device 5, the carbon dioxide and air are supplied to the breeding wastewater and the algal liquid in the gas-lift photobioreactor 3 in the form of nanometer bubbles through an aeration disc 501 at the bottom of the gas-lift photobioreactor 3 to make the gas and the microalgae fully contact, so as to promote the propagation and growth of the microalgae.

[0037] The stirring mechanism 302 of the gas-lift photobioreactor 3 is intermittently stirred to keep the microalgae and the nutrients in a suspended state, improve the light energy utilization efficiency and reduce the light inhibition, promote the carbon dioxide gas and the nutrients in the breeding wastewater to be absorbed and purified by the microalgae, and slow down the wall growth of the algal bodies. The algal liquid is expanded in the gas-lift photobioreactor 3 for 3-5 days in general, and then is pumped to a microalgae breeding raceway pond 4 by the pumping system 2. After the carbon dioxide and air are subjected to gas filtration and aeration by the gas filtration and aeration device 5, the carbon dioxide and air are supplied through an aeration disc 501 at the bottom of the microalgae breeding raceway pond 4, and a push wheel 402 of a push flow device 401 stirs the algal liquid and a liquid circulation system to keep the algal liquid in the raceway pond circulating, which is beneficial to keeping the microalgae and the nutrients in a suspended state, improving the light energy utilization efficiency and reducing the light inhibition, improving the exchange rate of the carbon dioxide gas and accelerating the dissolution speed, and is beneficial to separating the oxygen generated by the photosynthesis of the microalgae from the algal liquid and reducing the inhibition of the dissolved oxygen on the photosynthesis of the microalgae.

[0038] Meanwhile, it is beneficial to uniformly distributing the nutrients in the breeding wastewater and eliminating the thermal stratification of the algal liquid, accelerating the propagation and growth of the microalgae, and achieving the purpose of rapidly treating the breeding wastewater.

[0039] The lighting device 6 provides light for the growth and propagation of the microalgae and can adjust the light intensity.

[0040] The temperature adjusting device 7 mainly adjusts the temperature suitable for the growth and propagation of the microalgae, and the PH adjusting device 8 can add materials through a storage hopper 801 and a peristaltic pump 802 to deliver the materials through a pipeline 803 to adjust the PH value of the algal liquid, which is beneficial to the growth of the algae.

[0041] Embodiment two

[0042] The difference between the embodiment and the embodiment one is that a water pump is arranged on the inner side of the water outlet pipe 902, the water outlet of the water pump is connected with the water outlet pipe 902, the water inlet of the water pump is connected with the water inlet pipe 901, and the water pump is started to drive the multiple spray heads 903 to swing, expand the spraying range and benefit the circulation of the algae liquid.

[0043] The above merely describes a preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A device for treating livestock and poultry farming wastewater by microalgae, characterized in that: The utility model relates to an environment regulation system, pumping system (2) and the pretreatment device (1) of sequentially connecting pumping system (2), gas lift type photobioreactor (3), microalgae cultivation raceway pond (4) are included, gas filter aeration device (5) and environment regulation system are set up in one side of gas lift type photobioreactor (3) and microalgae cultivation raceway pond (4). The pretreatment device (1) includes a dilution storage cylinder and a disinfection and sterilization device (103), the inside of the dilution storage cylinder is sequentially filled from top to bottom with a biological filter layer (101) and a sand filter layer (102), and a pipeline (803) is fixedly connected between the pretreatment device (1) and the disinfection and sterilization device (103). The gas lift type photobioreactor (3) includes a storage cylinder, a stirring mechanism (302), and a lower hopper (301), and the stirring mechanism (302) is located in the middle of the gas lift type photobioreactor (3).

2. The device for treating livestock and poultry breeding wastewater by microalgae according to claim 1, characterized in that: The microalgae cultivation raceway pond (4) includes a cultivation raceway pond, a push flow device (401), and a liquid circulation device (9) arranged on one side of the cultivation raceway pond, and a propeller (402) is arranged on one side of the push flow device (401).

3. The device for treating livestock wastewater with microalgae according to claim 1, characterized in that: The liquid circulation device (9) includes a water inlet pipe (901) arranged at the bottom of the cultivation raceway pond and a water outlet pipe (902) arranged at the top of the cultivation raceway pond, and a plurality of nozzles (903) are arranged at equal intervals in the water outlet pipe (902).

4. The device for treating livestock farming wastewater by using microalgae according to claim 1, characterized in that: The bottom of the gas lift type photobioreactor (3) is provided with a plurality of nano aeration discs (501), and the plurality of nano aeration discs (501) are distributed at equal intervals in the bottom of the filter aeration device (5) with the stirring mechanism (302) as the center. The bottom of the microalgae cultivation raceway pond (4) is provided with a plurality of aeration discs, and the plurality of aeration discs are arranged at equal intervals in the bottom of the microalgae cultivation raceway pond (4).

5. The device for treating livestock farming wastewater with microalgae according to claim 4, characterized in that: The environment regulation system includes a plurality of sets of lighting devices (6), temperature adjusting devices (7), and PH adjusting devices (8) arranged in the gas lift type photobioreactor (3) and the cultivation raceway pond, wherein a plurality of sets of the lighting devices (6) are arranged in the gas lift type photobioreactor (3) with the stirring mechanism (302) as the center, and the other sets of the lighting devices (6) are arranged at equal intervals at the top of the cultivation raceway pond.

6. The device for treating livestock farming wastewater by using microalgae according to claim 1, characterized in that: The temperature adjusting device (7) includes a heating and insulation device and a cooling device, and the PH adjusting device (8) includes a storage hopper (801), the bottom end of the storage hopper (801) is connected with a peristaltic pump (802), and the bottom end of the peristaltic pump (802) is connected with a pipeline (803).

7. The device for treating livestock farming wastewater by using microalgae according to claim 1, characterized in that: ​ 8. The device for treating livestock farming wastewater with microalgae according to claim 7, characterized in that: ​

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