CN113583864A - System and method for culturing microalgae by using excess sludge with high solid content - Google Patents
System and method for culturing microalgae by using excess sludge with high solid content Download PDFInfo
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- CN113583864A CN113583864A CN202110890407.6A CN202110890407A CN113583864A CN 113583864 A CN113583864 A CN 113583864A CN 202110890407 A CN202110890407 A CN 202110890407A CN 113583864 A CN113583864 A CN 113583864A
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M47/00—Means for after-treatment of the produced biomass or of the fermentation or metabolic products, e.g. storage of biomass
- C12M47/06—Hydrolysis; Cell lysis; Extraction of intracellular or cell wall material
Abstract
The invention discloses a system and a method for culturing microalgae by using excess sludge with high solid content, which comprises a sludge crushing box, a microalgae culture tank and a microalgae culture chamber fixedly arranged in the microalgae culture tank, wherein an ultrasonic amplitude transformer is fixedly arranged below the sludge crushing box; a sludge outlet of the sludge crushing box is communicated with a sludge inlet at the bottom of the microalgae culture tank through a sludge through pipe, the bottom end of the microalgae culture tank is provided with an air inlet pipe which is opposite to the air inlet pipe, the air inlet pipe is communicated with an air source, the top end of the microalgae culture tank is provided with an air outlet valve, the top of the microalgae culture tank is provided with a plurality of quartz glass pipes extending into a microalgae culture chamber, and the quartz glass pipes are internally provided with light source components; and (3) sequentially introducing the excess sludge with high solid content into a sludge crushing box and a microalgae culture tank, carrying out ultrasonic crushing pretreatment, and then culturing the excess sludge with carbon dioxide, compressed air and microalgae. The invention realizes the resource utilization of the excess sludge with high solid content.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a system and a method for culturing microalgae by using excess sludge with high solid content.
Background
In recent years, with the continuous development of urbanization and industrialization in China, the discharge amount of high-concentration industrial wastewater is continuously increased, and the yield is greatly improved by using excess sludge as solid waste generated in the treatment of the industrial wastewater. The residual sludge generated by industrial wastewater, especially coal chemical wastewater, has complex components, contains organic matters, nitrogen, phosphorus and the like, is unstable and has foul smell, and the ecological environment is greatly damaged if the residual sludge is not properly treated. The treatment mode commonly adopted at the present stage is landfill treatment in a refuse dump or in-situ anaerobic digestion treatment in a sewage plant, which causes the problems of increased load of the sewage plant, influenced effluent quality and the like. Therefore, resource utilization of the excess sludge is a fundamental way to solve secondary pollution, and the premise of resource utilization is how to quickly and effectively release the nitrogen, phosphorus and other nutrient elements.
Disclosure of Invention
The invention aims to provide a system and a method for culturing microalgae by using excess sludge with high solid content, which are used for solving the problems in the prior art and realizing resource utilization of the excess sludge with high solid content.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a system for culturing microalgae by using excess sludge with high solid content, which comprises a sludge crushing box, a microalgae culturing tank and a microalgae culturing chamber fixedly arranged in the microalgae culturing tank, wherein an ultrasonic amplitude transformer is fixedly arranged below the sludge crushing box and is connected with an ultrasonic transducer, and the ultrasonic transducer is electrically connected with an ultrasonic generator; the sludge outlet of the sludge crushing box is communicated with the sludge inlet at the bottom of the microalgae culture tank through a sludge pipe, an interval is arranged between the microalgae culture chamber and the inner wall of the microalgae culture tank, the bottom end and the top end of the microalgae culture chamber are both provided with openings, the bottom end of the microalgae culture tank is provided with an air inlet pipe which is opposite to the opening at the bottom end of the microalgae culture chamber, the air inlet pipe is communicated with an air source, the air source contains carbon dioxide and compressed air, the top end of the microalgae culture tank is provided with an air outlet valve which is opposite to an opening at the top end of the microalgae culture chamber, a plurality of quartz glass tubes extending into the microalgae culture chamber are arranged at the top part in the microalgae culture tank, a light source component is arranged in each quartz glass tube, the top of little algae cultivation jar is provided with the supernatant delivery pipe, the middle part of little algae cultivation jar is provided with mud algae mixed phase delivery pipe.
Preferably, the top of the microalgae culture tank is further provided with a primary air guide sleeve, the top of the microalgae culture chamber extends into the primary air guide sleeve, and a gap is formed between the bottom end of the primary air guide sleeve and the outer wall of the microalgae culture chamber.
Preferably, a plurality of cyclone breakers distributed on the outer side of the top of the microalgae culture chamber in the circumferential direction are arranged in the primary air guide sleeve, and the cyclone breakers are fixedly connected with the inner wall of the primary air guide sleeve through connecting rods; the top of cyclone crusher is provided with two with the tangent feed inlet of cyclone crusher's inner chamber, cyclone crusher's inner wall sets firmly a plurality of archs that are the heliciform and distribute, the arch is the tetrahedron, bellied material is the stainless steel.
Preferably, a flow guide ring is arranged on the side wall of the microalgae culture chamber, and the flow guide ring is close to the bottom end of the primary flow guide cover and is positioned below the bottom end of the primary flow guide cover.
Preferably, the top of little algae cultivation jar still is provided with second grade kuppe and tertiary kuppe, the one-level kuppe the second grade kuppe the tertiary kuppe is coaxial and distribute from inside to outside in proper order, the second grade kuppe with the little algae cultivation jar have the interval between the top, the bottom throat of one-level kuppe, the bottom flaring of second grade kuppe.
Preferably, the microalgae culture chamber is a hollow cylindrical body, the microalgae culture chamber is coaxial with the microalgae culture tank, and the microalgae culture chamber is fixedly connected with the microalgae culture tank through a reinforcing steel bar support frame; the light source assembly comprises a flash light-emitting diode and a cable, the light-emitting diode is electrically connected with a power supply through the cable, the cable penetrates through the side wall of the microalgae culture tank, and the quartz glass tube is connected with the microalgae culture tank in a sealing mode.
Preferably, the supernatant discharge pipe is also communicated with the mud pipe through a return pipe.
Preferably, an interval of more than 1cm is formed between the ultrasonic amplitude transformer and the bottom plate of the sludge crushing box, and two ends of the ultrasonic amplitude transformer are respectively welded with the side wall of the sludge crushing box.
Preferably, the solid content of the high-solid-content excess sludge is not less than 1%, and preferably 1% -5%; the COD value of the high-solid-content excess sludge is 300-500mg/L, the mass fraction of the organic matters is not less than 70 percent, and the mass fraction of the easily biodegradable organic components is 40-60 percent; preferably, the high-solid-content excess sludge is excess sludge obtained after secondary biochemical treatment of wastewater subjected to heavy metal pre-removal, and the content of heavy metals in the excess sludge subjected to heavy metal pre-removal reaches the agricultural sludge pollutant control standard (GB 4284-2018).
The invention also provides a method for culturing microalgae by using the high-solid-content excess sludge, which comprises the steps of introducing the high-solid-content excess sludge into a sludge crushing box for ultrasonic crushing treatment, introducing the sludge into a microalgae culture tank, culturing the high-solid-content excess sludge subjected to ultrasonic crushing treatment in a microalgae culture chamber together with carbon dioxide, compressed air and microalgae, wherein a mixed phase of the high-solid-content excess sludge and the microalgae flows out of the microalgae culture chamber from the top end of the microalgae culture chamber under the pushing action of gas introduced from a gas inlet pipe, then crushing the mixed phase flow by using a cyclone crusher, and returning supernatant on the top of the microalgae culture tank into the microalgae culture tank through a supernatant discharge pipe, a return pipe and a sludge through pipe.
Compared with the prior art, the invention has the following technical effects:
the system and the method for culturing microalgae by using the excess sludge with high solid content realize resource utilization of the excess sludge with high solid content. According to the system and the method for culturing the microalgae by using the excess sludge with the high solid content, the ultrasonic amplitude transformer is fixedly arranged below the sludge crushing box, so that a cavitation effect and an activation effect can be generated on the ultrasonic radiation of the sludge in the sludge crushing box, and the micro jet of sound transmission in the ultrasonic cavitation process can effectively crush cell walls and degrade macromolecular organic matters in the sludge to change the macromolecular organic matters into non-toxic and harmless micromolecular organic matters, so that the microalgae cells are fully utilized, and the treatment effect of the sludge is improved; simultaneously, the sludge is quickly sucked by the shearing force formed by the high-speed airflow and is further crushed by introducing carbon dioxide, the microalgae is in a balanced mixed nutrition state by introducing a certain amount of carbon dioxide, and the functional protein substances are quickly enriched by utilizing the inorganic carbon source of the carbon dioxide and the organic carbon source in the residual sludge, so that the organic biological toxicity of the sludge is quickly reduced, and the CO is also favorably used2Effective fixation of (1); through setting up the cyclone crusher, utilize the shear stress that the whirl produced to break sludge floc, make organic matters such as polysaccharide and protein in the mud fully release, flow back to the mud section of advancing along with the supernatant, improve the effect that little algae was cultivateed to surplus sludge, the cyclone crusher carries out moderate degree breakage to little algae cell simultaneously, makes little algae intracellular functional protein fully release under a higher rate of recovery to little algae protein's biological activity has been kept. The system and the method for culturing the microalgae by using the excess sludge with the high solid content have the advantages of simple operation steps, stable treatment system and no byproduct generation, and the recovered mud-algae mixed substance can be further processed for resource utilization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a system for culturing microalgae with high-solid-content excess sludge according to the present invention;
FIG. 2 is a schematic diagram of a partial structure of a system for culturing microalgae with high-solid-content excess sludge according to the present invention;
FIG. 3 is a schematic structural diagram of a cyclone crusher in a system for culturing microalgae with high-solid-content excess sludge according to the present invention;
FIG. 4 is a schematic structural diagram I of a cyclone crusher in a system for culturing microalgae with high-solid-content excess sludge according to the present invention;
FIG. 5 is a schematic structural diagram of a cyclone crusher in the system for culturing microalgae with high-solid-content excess sludge according to the present invention;
FIG. 6 is a schematic structural diagram III of a cyclone crusher in the system for culturing microalgae with high-solid-content excess sludge according to the present invention;
wherein: 100. a system for culturing microalgae by using excess sludge with high solid content; 1. a sludge crushing box; 2. a mud pipe; 3. a microalgae culture tank; 4. a microalgae culture chamber; 5. air bubbles; 6. a reinforcing steel bar support frame; 7. an air inlet pipe; 8. a cyclone crusher; 801. a feed inlet; 802. a protrusion; 9. an air outlet valve; 10. a supernatant discharge pipe; 11. a primary air guide sleeve; 12. a secondary air guide sleeve; 13. a third stage air guide sleeve; 14. a mud-algae mixed phase discharge pipe; 15. an ultrasonic horn; 16. a flow guide ring; 17. a return pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The invention aims to provide a system and a method for culturing microalgae by using excess sludge with high solid content, which are used for solving the problems in the prior art and realizing resource utilization of the excess sludge with high solid content.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 6: the embodiment provides a system 100 for culturing microalgae by using excess sludge with high solid content, which comprises a sludge crushing tank 1, a microalgae culture tank 3 and a microalgae culture chamber 4 fixedly arranged in the microalgae culture tank 3. The solid content of the high solid content excess sludge is not less than 1 percent, and is preferably 1 to 5 percent, wherein the COD value of the high solid content excess sludge is 300-500mg/L, the mass fraction of the organic matter is not less than 70 percent, and the mass fraction of the biodegradable organic component is 40 to 60 percent; preferably, the high-solid-content excess sludge is excess sludge from secondary biochemical treatment of wastewater subjected to heavy metal pre-removal, and the content of heavy metals in the excess sludge subjected to heavy metal pre-removal reaches the agricultural sludge pollutant control standard (GB 4284-2018).
The sludge crushing box 1 is used for carrying out ultrasonic crushing pretreatment on the excess sludge with high solid content in the box. Specifically, a plurality of ultrasonic amplitude transformers 15 arranged in parallel are fixedly arranged below the sludge crushing box 1, the ultrasonic amplitude transformers 15 are connected with an ultrasonic transducer, and the ultrasonic transducer is electrically connected with an ultrasonic generator; an interval of more than 1cm is arranged between the ultrasonic amplitude transformer 15 and the bottom plate of the sludge crushing box 1, and two ends of the ultrasonic amplitude transformer 15 are respectively welded with the side wall of the sludge crushing box 1. The ultrasonic generator converts 220V power frequency alternating current into a high-frequency alternating current signal matched with the ultrasonic transducer, and the ultrasonic transducer is driven to work; the ultrasonic transducer converts the input electric power into mechanical power (namely ultrasonic wave) and transmits the mechanical power to the amplitude transformer; the amplitude transformer releases ultrasonic waves to generate a pre-crushing effect on the residual sludge entering the system, the total ultrasonic power is 1500-2000W, the ultrasonic frequency is 20-25kHz, the ultrasonic time is 4min, and the environmental temperature is 0-30 ℃. When the ultrasonic wave is used for carrying out ultrasonic wave crushing pretreatment on the excess sludge with high solid content in the sludge crushing box 1, the cavitation effect and the activation effect can be generated on the ultrasonic radiation of the sludge in the sludge crushing box 1, the cell wall can be effectively crushed by the acoustic micro-jet in the ultrasonic cavitation process, and macromolecular organic matters in the sludge are degraded, so that the macromolecular organic matters become non-toxic and harmless micromolecular organic matters, the microalgae cells are conveniently and fully utilized, and the treatment effect of the sludge is improved.
The mud outlet of the sludge crushing box 1 is communicated with a mud inlet at the bottom of the microalgae culture tank 3 through a mud pipe 2, an interval exists between the inner walls of the microalgae culture chamber 4 and the microalgae culture tank 3, the bottom end and the top end of the microalgae culture chamber 4 are both open, in the embodiment, the microalgae culture chamber 4 is a hollow columnar body, the microalgae culture chamber 4 is coaxial with the microalgae culture tank 3, and the microalgae culture chamber 4 is fixedly connected with the microalgae culture tank 3 through a steel bar support frame 6.
The bottom end of the microalgae culture tank 3 is provided with an air inlet pipe 7 facing the opening at the bottom end of the microalgae culture chamber 4, the air inlet pipe 7 is communicated with an air source, the air source contains carbon dioxide and compressed air, and the volume ratio of the compressed air to the carbon dioxide is 1-9:1, preferably 2.5: 1. The top end of the microalgae culture tank 3 is provided with an air outlet valve 9 which is opposite to the opening of the top end of the microalgae culture chamber 4.
The top in the microalgae culture tank 3 is provided with a plurality of quartz glass tubes (not shown in the figure) extending into the microalgae culture chamber 4, each quartz glass tube is internally provided with a light source assembly, the light source assemblies are flash light-emitting diodes and cables, the light-emitting diodes are electrically connected with a power supply through the cables, the cables penetrate through the side wall of the microalgae culture tank 3, and the quartz glass tubes are hermetically connected with the microalgae culture tank 3. As a more preferable scheme, the side wall of the microalgae cultivation chamber 4 may be made of a transparent material, the flash light emitting diode is disposed in the side wall of the microalgae cultivation chamber 4, the quartz glass tube is hermetically connected with the side wall of the microalgae cultivation chamber 4, and the quartz glass tube is only used as a passage for erecting a cable, so as to avoid short circuit caused by direct contact between the cable and liquid.
The top of the microalgae culture tank 3 is provided with a supernatant discharge pipe 10, the middle part of the microalgae culture tank 3 is provided with a mud-algae mixed phase discharge pipe 14, and the supernatant discharge pipe 10 is also communicated with the mud pipe 2 through a return pipe 17. The supernatant on the top of the microalgae culture tank 3 can flow back into the microalgae culture tank 3 through the supernatant discharge pipe 10, the return pipe 17 and the mud pipe 2; the reflux ratio of the supernatant liquid reflux is 2-4.
The top of the microalgae culture tank 3 is also provided with a first-stage air guide sleeve 11, a second-stage air guide sleeve 12 and a third-stage air guide sleeve 13, the first-stage air guide sleeve 11, the second-stage air guide sleeve 12 and the third-stage air guide sleeve 13 are coaxial and are sequentially distributed from inside to outside, an interval is arranged between the second-stage air guide sleeve 12 and the top of the microalgae culture tank 3, the bottom end of the first-stage air guide sleeve 11 is contracted, and the bottom end of the second-stage air guide sleeve 12 is expanded. A flow guide ring 16 is arranged on the side wall of the microalgae culture chamber 4, and the flow guide ring 16 is close to the bottom end of the first-stage flow guide cover 11 and is positioned below the bottom end of the first-stage flow guide cover 11; the guide ring 16 is closely contacted with the outer wall of the microalgae culture chamber 4, and no gap is formed between the guide ring 16 and the outer wall of the microalgae culture chamber 4. The guide ring 16, the first-stage guide cover 11, the second-stage guide cover 12 and the third-stage guide cover 13 are used for guiding the algae-mud mixed phase flowing out from the top end of the microalgae culture chamber 4, so that the supernatant can flow out from the supernatant discharge pipe 10 and partially flows back to enter a mud inlet instead of directly flowing into the bottom of the microalgae culture tank 3.
The top of the microalgae culture chamber 4 extends into the first-stage air guide sleeve 11, and a gap is formed between the bottom end of the first-stage air guide sleeve 11 and the outer wall of the microalgae culture chamber 4. Two cyclone crushers 8 which are uniformly distributed at the outer side of the top of the microalgae culture chamber 4 in the circumferential direction are arranged in the first-stage air guide sleeve 11, and the cyclone crushers 8 are fixedly connected with the inner wall of the first-stage air guide sleeve 11 through connecting rods; the top of the cyclone crusher 8 is provided with two feed inlets 801 tangent to the inner cavity of the cyclone crusher 8, the inner wall of the cyclone crusher 8 is fixedly provided with a plurality of protrusions 802 distributed spirally, the protrusions 802 are in a tetrahedral shape, and the protrusions 802 are made of stainless steel. The distribution spacing of the protrusions 802 is 20-30% of the inner diameter of the cyclone crusher 8, and the height of the protrusions 802 is 5-10% of the inner diameter of the cyclone crusher 8. The strong shearing force in the cyclone breaking system comes from the large velocity gradient generated by the mud-algae mixture phase passing through the cyclone breaker 8 and the strong friction force caused by the irregular stainless steel protrusions 802 on the inner wall of the cyclone breaker 8. The crushing effect can be enhanced by increasing the flow velocity of the mud-algae mixed phase entering the vortex breaker 8. After the cyclone treatment of the cyclone crusher 8, the grain diameter of at least 60 percent of flocs in the mud-algae mixed phase is 0.5mm-1mm, and the velocity gradient of the mud-algae mixed phase in the cyclone crusher 8 is not less than 1000S-1Preferably 2000-3000S-1。
The invention also provides a method for culturing microalgae by using the excess sludge with high solid content, which comprises the following steps: based on the system 100 for culturing microalgae by using excess sludge with high solid content, the excess sludge with high solid content is introduced into the sludge crushing box 1 for ultrasonic crushing treatment, and then is introduced into the microalgae culture tank 3, the excess sludge with high solid content after ultrasonic crushing treatment in the microalgae culture chamber 4 is cultured together with carbon dioxide, compressed air and microalgae, the sludge is rapidly sucked by shearing force formed by high-speed airflow and is further crushed by introducing the carbon dioxide, the microalgae is also in a relatively balanced mixed nutrition state by introducing a certain amount of carbon dioxide, and by using an inorganic carbon source of the carbon dioxide and an organic carbon source in the excess sludge, functional protein substances are rapidly enriched, the organic biotoxicity of the sludge is rapidly reduced, and the effective fixation of the carbon dioxide is facilitated.
The gas introduced into the gas inlet pipe 7 forms bubbles 5 in the mixed phase of the high-solid-content excess sludge and the microalgae, the mixed phase of the high-solid-content excess sludge and the microalgae flows out of the microalgae culture chamber 4 from the top end of the microalgae culture chamber 4 under the pushing of the bubbles 5, and then the mixed phase flows through the cyclone crusher 8 to be crushed; through setting up cyclone crusher 8, utilize the shear stress that the whirl produced to break sludge floc, make organic matters such as polysaccharide and protein in the mud fully release, flow back to the mud section of advancing along with the supernatant, improve the effect that little algae was cultivateed to surplus sludge, cyclone crusher 8 carries out the moderate degree breakage to little algae cell simultaneously, makes little intracellular functional protein fully release under a higher rate of recovery to little algae protein's biological activity has been kept.
The supernatant on the top of the microalgae culture tank 3 flows back into the microalgae culture tank 3 through the supernatant discharge pipe 10, the return pipe 17 and the mud pipe 2, and the supernatant is recycled; discharging the supernatant with a proportion except the reflux ratio at the top of the microalgae culture tank 3 through a supernatant discharge pipe 10.
In the description of the present invention, it should be noted that the terms "top", "bottom", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "primary," "secondary," and "tertiary" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A system for culturing microalgae by using excess sludge with high solid content is characterized in that: the device comprises a sludge crushing tank, a microalgae culture tank and a microalgae culture chamber fixedly arranged in the microalgae culture tank, wherein an ultrasonic amplitude transformer is fixedly arranged below the sludge crushing tank and is connected with an ultrasonic transducer, and the ultrasonic transducer is electrically connected with an ultrasonic generator; the sludge outlet of the sludge crushing box is communicated with the sludge inlet at the bottom of the microalgae culture tank through a sludge pipe, an interval is arranged between the microalgae culture chamber and the inner wall of the microalgae culture tank, the bottom end and the top end of the microalgae culture chamber are both provided with openings, the bottom end of the microalgae culture tank is provided with an air inlet pipe which is opposite to the opening at the bottom end of the microalgae culture chamber, the air inlet pipe is communicated with an air source, the air source contains carbon dioxide and compressed air, the top end of the microalgae culture tank is provided with an air outlet valve which is opposite to an opening at the top end of the microalgae culture chamber, a plurality of quartz glass tubes extending into the microalgae culture chamber are arranged at the top part in the microalgae culture tank, a light source component is arranged in each quartz glass tube, the top of little algae cultivation jar is provided with the supernatant delivery pipe, the middle part of little algae cultivation jar is provided with mud algae mixed phase delivery pipe.
2. The system for culturing microalgae by using the excess sludge with high solid content as claimed in claim 1, wherein: the top of the microalgae culture tank is also provided with a primary air guide sleeve, the top of the microalgae culture chamber extends into the primary air guide sleeve, and a gap is arranged between the bottom end of the primary air guide sleeve and the outer wall of the microalgae culture chamber.
3. The system for culturing microalgae by using the excess sludge with high solid content as claimed in claim 2, wherein: a plurality of cyclone crushers which are circumferentially distributed on the outer side of the top of the microalgae culture chamber are arranged in the first-stage air guide sleeve and are fixedly connected with the inner wall of the first-stage air guide sleeve through connecting rods; the top of cyclone crusher is provided with two with the tangent feed inlet of cyclone crusher's inner chamber, cyclone crusher's inner wall sets firmly a plurality of archs that are the heliciform and distribute, the arch is the tetrahedron, bellied material is the stainless steel.
4. The system for culturing microalgae by using the excess sludge with high solid content as claimed in claim 2, wherein: the side wall of the microalgae culture chamber is provided with a guide ring, and the guide ring is close to the bottom end of the first-stage guide cover and is positioned below the bottom end of the first-stage guide cover.
5. The system for culturing microalgae by using the excess sludge with high solid content as claimed in claim 2, wherein: the top of little algae cultivation jar still is provided with second grade kuppe and tertiary kuppe, the one-level kuppe the second grade kuppe the tertiary kuppe is coaxial and distribute from interior to exterior in proper order, the second grade kuppe with the little algae is cultivateed and has the interval between the top of jar, the bottom throat of one-level kuppe, the bottom flaring of second grade kuppe.
6. The system for culturing microalgae by using the excess sludge with high solid content as claimed in claim 1, wherein: the microalgae culture chamber is a hollow cylindrical body, is coaxial with the microalgae culture tank, and is fixedly connected with the microalgae culture tank through a reinforcing steel bar support frame; the light source assembly comprises a flash light-emitting diode and a cable, the light-emitting diode is electrically connected with a power supply through the cable, the cable penetrates through the side wall of the microalgae culture tank, and the quartz glass tube is connected with the microalgae culture tank in a sealing mode.
7. The system for culturing microalgae by using the excess sludge with high solid content as claimed in claim 1, wherein: the supernatant fluid discharge pipe is also communicated with the mud pipe through a return pipe.
8. The system for culturing microalgae by using the excess sludge with high solid content as claimed in claim 1, wherein: the ultrasonic amplitude transformer and the bottom plate of the sludge crushing box are spaced by more than 1cm, and two ends of the ultrasonic amplitude transformer are respectively welded with the side wall of the sludge crushing box.
9. The system for culturing microalgae by using the excess sludge with high solid content as claimed in claim 1, wherein: the solid content of the high-solid-content excess sludge is not less than 1 percent, and preferably 1 to 5 percent; the COD value of the high-solid-content excess sludge is 300-500mg/L, the mass fraction of the organic matters is not less than 70 percent, and the mass fraction of the easily biodegradable organic components is 40-60 percent; preferably, the high-solid-content excess sludge is excess sludge obtained after secondary biochemical treatment of wastewater subjected to heavy metal pre-removal, and the content of heavy metals in the excess sludge subjected to heavy metal pre-removal reaches the agricultural sludge pollutant control standard (GB 4284-2018).
10. A method for culturing microalgae by using excess sludge with high solid content is characterized by comprising the following steps: introducing the high-solid-content excess sludge into a sludge crushing tank for ultrasonic crushing treatment, introducing into a microalgae culture tank, culturing the high-solid-content excess sludge subjected to ultrasonic crushing treatment in a microalgae culture chamber together with carbon dioxide, compressed air and microalgae, wherein a mixed phase of the high-solid-content excess sludge and the microalgae flows out of the microalgae culture chamber from the top end of the microalgae culture chamber under the pushing of gas introduced from a gas inlet pipe, then crushing the mixed phase flow through a cyclone crusher, and refluxing a supernatant at the top of the microalgae culture tank into the microalgae culture tank through a supernatant discharge pipe, a reflux pipe and a sludge through pipe.
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| US8642326B1 (en) * | 2009-09-02 | 2014-02-04 | Alan W. Schaefer | System for the production and harvesting of algae |
| CN107400626A (en) * | 2017-09-19 | 2017-11-28 | 广西大学 | A kind of micro algae culturing device |
| CN110885756A (en) * | 2019-11-12 | 2020-03-17 | 湖南工业大学 | Method for culturing oil-producing chlorella by using sludge anaerobic digestive fluid |
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| CN113583864B (en) | 2023-09-22 |
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